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PFKFB3 (6-phosphofructo-2-kinase/fructose-2,6-biphosphatase 3)

Written2013-03Laura Novellasdemunt, Àurea Navarro-Sabaté, Anna Manzano, Ana Rodríguez-García, Ramon Bartrons
Departament de Ciencies Fisiologiques, Campus de Ciencies de la Salut, Universitat de Barcelona, Feixa Llarga s/n, E-08907, L'Hospitalet de Llobregat, Barcelona, Spain

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Identity

Alias (NCBI)IPFK2
PFK2
HGNC (Hugo) PFKFB3
LocusID (NCBI) 5209
Atlas_Id 45932
Location 10p15.1  [Link to chromosome band 10p15]
Location_base_pair Starts at 6202932 and ends at 6235532 bp from pter ( according to GRCh38/hg38-Dec_2013)  [Mapping PFKFB3.png]
 
  Figure 1. Localization of human PFKFB3 gene by in situ hybridization.
Fusion genes
(updated 2017)		Data from Atlas, Mitelman, Cosmic Fusion, Fusion Cancer, TCGA fusion databases with official HUGO symbols (see references in chromosomal bands)
ISL1 (5q11.1) / PFKFB3 (10p15.1)KIAA1217 (10p12.2) / PFKFB3 (10p15.1)LARP4B (10p15.3) / PFKFB3 (10p15.1)
PFKFB3 (10p15.1) / ASRGL1 (11q12.3)PFKFB3 (10p15.1) / ECM1 (1q21.3)PFKFB3 (10p15.1) / ERCC1 (19q13.32)
PFKFB3 (10p15.1) / FAM208B (10p15.1)PFKFB3 (10p15.1) / PFKFB3 (10p15.1)PFKFB3 (10p15.1) / ZNF831 (20q13.32)
TBC1D2B (15q24.3) / PFKFB3 (10p15.1)
Note The human PFKFB3 gene is located on the short arm of chromosome 10 at position 10p15.1 (Manzano et al., 1998) (Figure 1).
Location in the mouse: chromosome 2, 8,73 cM, 11471430-11502101 bp, complement strand (MGI).
For a comparison of the gene of Homo sapiens, mouse, rat, cattle, chimpanzee and domestic dog see: (MGI). Also for all species known gene tree, see: Treefam database.

DNA/RNA

 
  Figure 2. Splicing pattern of the human PFKFB3 gene. Schematic organization of the human PFKFB3 gene generated by alternative splicing and the protein sequence derived. The sequences of UBI2K4 and UBI2K5 isoforms corresponds to iPFKFB3 and uPFKFB3, respectively.
Description The human PFKFB3 is composed of 19 exons spanning genomic region about 90,6 Kb (GenBank). Alternative splicing variants have been reported. The main variants corresponding to mRNAs of 4453 bp and 4224 bp for the variant 1 u-PFK2 (NM_004566.3) and variant 2 i-PFK2 (NM_001145443.1), respectively (Figure 2).
Transcription The human PFKFB3 coding sequence consists of 1503 bp for i-PFK2 and 1563 bp for u-PFK2 from the start codon to the stop codon. Multiple alternatively spliced transcript variants have been found for this gene. (Entrez Gene) (OTTMUSG00000011314).
Pseudogene No pseudogene of PFKFB3 known.

Protein

 
  Figure 3. Scheme of the 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase (PFK-2/FBPase-2) activity. PFKFB3 protein consists of two homodimeric subunits of 59,6 KDa. The monomer structure contains two functional domains; kinase and bisphosphatase, located at N-terminal and C-terminal regions, respectively. PFKFB3 has the highest Kinase/Bisphosphatase activity ratio (K/B=700) which promotes high concentrations of Fru-2,6-P2.
Description PFKFB3 protein consists of two homodimeric subunits of 520 amino acids, with a molecular weight of 59609 Da for each subunit. The monomer structure is divided into two functional domains within the same polypeptidic chain (El-Maghrabi et al., 1982; Okar et al., 2001; Pilkis et al., 1995). The finding of mutations that affect kinase activity of the enzyme (Kurland et al., 1995; Li et al., 1992b; Rider et al., 1994), and the localization of ATPγS in the structure, lead to the identification of the N-terminal domain as the kinase domain, which catalyses the synthesis of Fru-2,6-P2, using fructose-6-phosphate and adenosine-5-triphosphate (ATP) as substrates (Figure 3). On the other hand, structural and sequence homology with yeast phosphoglycerate mutase (Winn et al., 1981) and rat acid phosphatase (Schneider et al., 1993), along with the location of mutations that affect Fru-2,6-Pase activity (Li et al., 1992a; Li et al., 1992c; Lin et al., 1992; Tauler et al., 1990) suggested the C-terminal domain to contain the bisphosphatase activity of the enzyme. This domain is responsible for the hydrolytic degradation of Fru-2,6-P2 into fructose-6-P and inorganic phosphate (Pi). These two mutually opposing catalytic activities are controlled by different mechanisms such that either activity is predominant in a given physiological condition. Ultimately, 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase (PFK-2/FBPase-2) activities control Fru-2,6-P2 synthesis and degradation, regulating the rate of glucose metabolism.
Different PFK-2/FBPase-2 isoenzymes have been described, sharing high sequence similarity (85%). PFKFB3 isoenzyme has some structural differences with the other isoforms. The conformations of the substrate loops in the kinase domain are different from those of other isoforms (Hasemann et al., 1996; Lee et al., 2003), giving a structural explanation for the higher kinase activity. Moreover, the N-terminus binds to the bisphosphatase domain to produce a conformational change in the active pocket to enhance inhibitory binding of product (Kim et al., 2006). Residues 4-15 of the kinase domain form a β-hairpin structure and the rest is used as an arm connecting the hairpin to the bisphosphatase domain. Additionally, the contacting area of the bisphosphatase domain is functionally very sensitive due to the residues critical for binding of both product and substrate are located very close (Kim et al., 2006). The low bisphosphatase activity of PFKFB3, which is lower than that of other isoforms by an order of magnitude, is due to the presence of a serine at residue 302 instead of an arginine as conserved in the other isoforms. This residue is said to interact with the 2-phosphate and further stabilizes the transitions state (Cavalier et al., 2012; Kim et al., 2006).
Expression The PFKFB3 gene product is present in proliferating tissues (Duran et al., 2008a; Duran et al., 2009; Goren et al., 2000; Manzano et al., 1998; Sakai et al., 1996) and transformed cells (Calvo et al., 2006; Chesney et al., 1999; Hamilton et al., 1997; Minchenko et al., 2002; Novellasdemunt et al., 2012; Obach et al., 2004; Riera et al., 2002) and various tumors (Atsumi et al., 2002; Fleischer et al., 2011; Kessler et al., 2008). The high kinase/ bisphosphatase activity ratio of this isoenzyme can explain the high Fru-2,6-P2 found in the cells where it is present, which in turn sustains high glycolytic rates and it is crucial in supporting growing and proliferant cell metabolism.
PFKFB3 gene has been found to be expressed in different cell systems. During C2C12 myogenic cell differentiation, the 6-phosphofructo-2-kinase isoenzyme, product of the PFKFB3 gene, is downregulated, being the PFKFB3 isoenzyme degraded through the ubiquitin-proteasome proteolytic pathway (Riera et al., 2003). In neurons, PFKFB3 is constantly subjected to proteasome degradation after ubiquitylation by the E3 ubiquitin ligase APC/C-Cdh1. The activity of this complex is determinant in controlling the protein levels of PFKFB3 and hence the rate of glucose consumption through glycolysis. The function of APC/C is strictly dependent on the presence of Cdh1, which is very abundant in these cells. In contrast, astrocytes express very low Cdh1 levels and therefore APC/C activity is negligible. Accordingly, PFKFB3 protein levels are high and glycolysis is active in astrocytes owing to the low levels of Cdh1. In fact, overexpression of Cdh1 in astrocytes destabilizes PFKFB3 and concomitantly decreases the rate of glycolysis (Fernandez-Fernandez et al., 2012). The later finding that the activity of the PFKFB3 isoenzyme is regulated in cancer cells by APC/C-Cdh1 (Almeida et al., 2010) led to the identification of the role of this ubiquitin ligase in the metabolic regulation of the cell cycle and therefore of cell proliferation (Moncada et al., 2012).
The regulatory component of this complex, Cdh1, has been shown to be downregulated during malignant progression and tumor formation. A decrease in the activity of APC/C-Cdh1 in mid-to-late G1 phase, that has been described as the nutrient-sensitive restriction point and is responsible for the transition from G1 to S, leads to the accumulation of PFKFB3 and enhances the glycolytic flux in malignant cells. PFKFB3 is also a substrate at the onset of S-phase for the ubiquitin ligase SCF (Skp1/cullin/F-box)-β-TrCP (β-transducin repeat-containing protein), so that the activity of PFKFB3 is short-lasting, coinciding with a peak in glycolysis in mid-to-late G1, demonstrating that proliferation and the induction of aerobic glycolysis are both essential components of neoplastic transformation (Moncada et al., 2012).
PFKFB3 has also been found in testis. In adult testes both PFKFB3 and PFKFB4 isoenzymes are present. PFKFB3 is located across the seminiferous epithelium, whereas expression of PFKFB4 is restricted to the spermatogenic cells, being the only one present in mature spermatozoa (Gomez et al., 2005). This differential distribution supports the idea that the cell-specific isoenzymes are able to adapt their kinetic and regulatory enzymatic properties to the metabolic demand of a particular tissue or cell status. Thus, in parallel with spermatogenesis and spermiogenesis, PFKFB isoenzyme expression switches from PFKFB3, which is required during the proliferative phase, to the testis isoform PFKFB4, which is germ cell specific (Gomez et al., 2012; Gomez et al., 2009).
In mouse hypothalami, PFKFB3 mRNA levels are increased by 10-fold in response to re-feeding. In the hypothalamus, re-feeding also decreases the phosphorylation of AMP-activated protein kinase (AMPK) (Thr172) and the mRNA levels of agouti-related protein (AgRP), and increases the mRNA levels of cocaine-amphetamine-related transcript (CART). In addition, knockdown of PFKFB3 in N-43/5 neurons causes a decrease in rates of glycolysis, which is accompanied by increased AMPK phosphorylation, increased AgRP mRNA levels and decreased CART mRNA levels. In contrast, overexpression of PFKFB3 in N-43/5 neurons causes an increase in glycolysis, which was accompanied by decreased AMPK phosphorylation and decreased AgRP mRNA levels and increased CART mRNA levels. Together, these results suggest that PFKFB3 responds to re-feeding, which in turn stimulates hypothalamic glycolysis and decreases hypothalamic AMPK phosphorylation and alters neuropeptide expression in a pattern that is associated with suppression of food intake (Li et al., 2012).
Recent results have shown that the tumour suppressor PTEN promotes APC/C-Cdh1 activity (Song et al., 2011) and that cells from mice overexpressing PTEN exhibit reduced glucose and glutamine uptake and are resistant to oncogenic transformation (Garcia-Cao et al., 2012). Studies on the possible connection between APC/C-Cdh1 and the metabolic effects of other tumour suppressors such as p53 (Feng and Levine, 2010) or known proto-oncogenes such as c-Myc (Morrish et al., 2008) and Akt (Matheny and Adamo, 2009) are also likely to be highly relevant.
Localisation PFKFB3 protein is predominantly cytoplasmic but it has been found also into the nucleus. PFKFB3 overexpression produces a marked increase in cell proliferation. These effects on proliferation were completely abrogated by mutating either the active site or nuclear localization residues of PFKFB3, demonstrating a requirement for nuclear delivery of Fru-2,6-P2 which produced an increase in the expression of several key cell cycle proteins, including cyclin-dependent kinase Cdk1, Cdc25C, and cyclin D3 and decreased the expression of the cell cycle inhibitor p27, a universal inhibitor of Cdk-1 and the cell cycle, indicating that Fru-2,6-P2 may couple the activation of glucose metabolism with cell proliferation (Yalcin et al., 2009a).
 
  Figure 4. PFKFB3 activities and function in the glycolytic pathway.
Figure 5. Analysis of the 5' PFKFB3 human gene promoter region. Putative regulatory elements in the PFKFB3 gene promoter.
Table I. Properties of PFKFB genes.
Function Synthesis and degradation of fructose-2,6-bisphosphate:
- Kinase catalytic activity: ATP + D-fructose-6-phosphate = ADP + beta-D-fructose-2,6-bisphosphate
- Phosphatase catalytic activity: Beta-D-fructose-2,6-bisphosphate + H2O = D-fructose-6-phosphate + phosphate
The rate of glycolytic flux is controlled at different levels and by different mechanisms: substrate availability, enzyme concentrations, allosteric effectors and covalent modification on regulatory enzymes. One of the critically modulated steps is that catalysed by 6-phosphofructo-1-kinase (PFK-1), with fructose-2,6-bisphosphate (Fru-2,6-P2) being its most powerful allosteric activator (Okar and Lange, 1999; Rider et al., 2004; Van Schaftingen, 1987). Fru-2,6-P2 relieves ATP inhibition and acts synergistically with AMP, and in addition it inhibits fructose 1,6-bisphosphatase (Van Schaftingen, 1987). These properties confer to this metabolite a key role in the control of fructose-6-P/fructose-1,6-P2 substrate cycle and hence critically regulate carbohydrate metabolism (Figure 4).

PFKFB genes
In mammals, there are four PFKFB genes (PFKFB1, PFKFB2, PFKFB3 and PFKFB4) which code for the different PFK-2/FBPase-2 isoenzymes, characterized by their cellular expression patterns. These isoforms share highly conserved core catalytic domains (85%) but differ greatly in their kinetic properties and responses to regulatory signals (Okar et al., 2001). These differences are mostly due to highly divergent N- and C-terminal regulatory domains; however, a few but significant sequence differences in the catalytic domains that constitute the secondary residue shells surrounding the active sites also contribute to the kinetic differences (Cavalier et al., 2012).
These isoforms show differences in their distribution and kinetic properties in response to allosteric effectors, hormonal, and growth factor signals (Okar et al., 2001). The expression of these genes is dependent on tissue and on development stage (Goren et al., 2000). Importantly, tissue- and cell-specific isoenzymes are not totally exclusive and several cells express more than one isoenzyme (Calvo et al., 2006; Minchenko et al., 2005a; Minchenko et al., 2005b; Telang et al., 2006). This pattern of expression suggests that each isoenzyme plays a key role under different physiological conditions or in response to different stimuli. Although the PFKFB isoenzymes have the same enzymatic activities and share the same substrates, indicating functional redundancy, their biological function and regulation is different in the specific cells (Table I).
PFKFB1 is mainly expressed in liver and skeletal muscle, PFKFB2 in heart tissue, PFKFB3 is expressed ubiquitously in several tissue and proliferating cells, and PFKFB4 was originally found in testis (Okar et al., 2001).
PFKFB3 has a uniquely large 6-phosphofructo-2-kinase to fructose-2,6-bisphosphatase activity ratio compared to other isoforms (Sakakibara et al., 1997). This isoform, which has a native activity ratio of roughly 700-fold kinase-to-phosphatase activity, dramatically increases upon phosphorylation of Ser461 by protein kinase A (PKA), AMP-dependent protein kinase (AMPK) or other kinases. The low bisphosphatase activity of PFKFB3, which is lower than that of other isoforms by an order of magnitude, is solely due to the presence of a serine at residue 302 instead of an arginine as conserved in the other isoforms (Cavalier et al., 2012; Kim et al., 2006). PFKFB3 gene was cloned from a fetal brain library (Manzano et al., 1998; Ventura et al., 1995), human placenta (Sakai et al., 1996) and breast cancer cells (Hamilton et al., 1997).
PFKFB3 is expressed ubiquitously and it is present in proliferating tissues, transformed cells and in tumours (Almeida et al., 2010; Atsumi et al., 2002; Bando et al., 2005; Calvo et al., 2006; Chesney et al., 1999; Duran et al., 2008a; Duran et al., 2009; Kessler et al., 2008; Novellasdemunt et al., 2012; Riera et al., 2002; Yalcin et al., 2009b). An inducible PFK-2/FBPase-2 (iPFK-2) with proto-oncogenic features was cloned from cancer cell lines (Chesney et al., 1999). The iPFK-2 represents a splice product of the PFKFB3 gene, as does the ubiquitous PFK-2/FBPase-2 (uPFK-2) (Navarro-Sabate et al., 2001). In human brain, have been demonstrated the occurrence of six alternatively spliced PFKFB3 transcripts, designated UBI2K1-6 splice isoforms of ubiquitous 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase (Kessler and Eschrich, 2001).

Regulation:
PFKFB3 gene is regulated by different mechanisms. Induction of its expression has been reported in response to different stimuli, amongst these are hypoxia (Bartrons and Caro, 2007; Minchenko et al., 2002; Obach et al., 2004) and progestins (Hamilton et al., 1997; Novellasdemunt et al., 2012), through HIF (Hypoxia Inducible Factor) and PR (progesterone receptor) interactions within their binding to the consensus HRE (Hypoxia response element) and PRE (progesterone response element) sites located at PFKFB3 promoter, respectively. Growth factors such as insulin (Riera et al., 2002) and pro-inflammatory molecules (Chesney et al., 1999) such as IL-6 (Ando et al., 2010), LPS and adenosine (Ruiz-Garcia et al., 2011) or in response to stress stimuli (NaCl, H2O2, UV radiation or anisomycin) through SRF (Serum Response Factor) and its binding to SRE (Serum response element) site (Novellasdemunt et al., 2013) (Figure 5). The proinflammatory cytokine interleukin (Il-6) enhances glycolysis through activation of PFKFB3 as a consequence of the STAT3 activation (Ando et al., 2010). PFKFB3 is also a target gene of PPARγ. Additionally, PFKFB3 is involved in the antidiabetic effect of PPARγ activation, at least, by suppressing excessive fatty acid oxidation-related reactive oxygen species (ROS) production and inflammatory responses in adipose tissue/adipocytes (Huo et al., 2010).
The product of the PFKFB3 gene, the bifunctional enzyme 6-phosphofructo-2-kinase/ fructose-2,6-bisphosphatase, is also controlled by different mechanisms. In addition to the gene expression regulation, the C-terminal domain can be phosphorylated at Ser461 by different protein kinases, such as AMP-activated protein kinase (AMPK) (Bando et al., 2005; Marsin et al., 2002), RSK (Novellasdemunt et al., 2012) and MK2 (Novellasdemunt et al., 2013) (Figure 6).
Ser461 can also be phosphorylated by PKC and PKA making it responsive to multiple external signals (Okamura and Sakakibara, 1998). Phosphorylated PFKFB3 kinetics shows an increase in Vmax of the kinase activity and a decreased Km for Fru-6-P (Marsin et al., 2002; Novellasdemunt et al., 2012). Furthermore, the PFKFB3 isoenzyme was found to be regulated through the PI3K (phosphoinositide 3-kinase)/Akt/mTOR (mammalian target of rapamycin) pathway, turning it into a target of growth factors signalling (Duran et al., 2009; Garcia-Cao et al., 2012) (Figure 7).
Furthermore, the mRNAs of all PFKFB3 isoforms contain multiple copies of the AUUUA instability motif in its 30 untranslated region (30UTR) (Chesney et al., 1999). AU-rich elements (AREs) target them RNAs of proto-oncogenes and pro-inflammatory cytokines for rapid degradation and regulate the efficiency of their translation into proteins (Chen and Shyu, 1995).
Also, PFKFB3 isoenzyme is regulated by modulation of its protein stability. Thus, it is degraded through the ubiquitin/proteasome proteolytic pathway (Riera et al., 2003). PFKFB3 but not the other isoenzymes, contains a recognition signal composed of a K-E-N box (KENXXXN), where K is lysine, E is glutamate and N is asparagine, that is recognized by the anaphase-promoting complex/cyclosome (APC/Cdh1), an E3 ubiquitin ligase complex that plays an essential role in G1 phase and mitosis through the degradation of several cell cycle proteins and PFKFB3 (Almeida et al., 2010).

 
  Figure 6. PFKFB3 phosphorylation sites. The residues Ser461 and Ser478 correspond to PFKFB3 isoenzyme and are equivalent to Ser466 and Ser483 of the PFKFB2 isoenzyme. The colours represent the phosphorylation residues (red), residues fully conserved in all or at least one of the isoforms (green), similar residues (yellow) and different residues (black).
Figure 7. Differential physiological factors regulate PFKFB3 gene expression and its isoenzyme activity through phosphorylation of Ser461.
Homology It appears that the use of Fru-2,6-P2 as a regulatory metabolite is a specifically eukaryotic phenomenon. The most plausible hypothesis for the origin of the PFK-2/FBPase-2 would be the fusion of two ancestral genes coding for a kinase functional unit and a phosphohydrolase/mutase unit, respectively. From protein sequence alignments, it is clear that the bisphosphatase activity located in the C-terminal domain of the PFK-2/FBPase-2 is homologous to the phosphoglyceratemutases (PGMs) and the acid phosphatase family (Jedrzejas, 2000; Okar et al., 2001). Alignments of the bisphosphatase domain with PGM and acid phosphatase can be accessed at InterPro.
The N-terminal PFK-2 domain is sequentially and structurally homologous to several nucleotide binding proteins, primarily that of adenylate kinase of E. coli.

Mutations

Note No PFKFB mutations have been collected in the COSMIC database. A lot of SNPs have been described, but they are not affecting to coding sequences. 2319 NCBI SNPs in PFKFB3 are shown (GeneCard).
Germinal No germinal mutations of PFKFB3 have been described.
Somatic Loss of heterozygosity (LOH) of PFKFB3 has been found in 55% of glioblastomas. The allelic deletion of PFKFB3 resulted in a decrease of PFKFB3 mRNA level accompanied by a lower PFKFB3 protein level. The expression of growth-inhibiting splice variant UBI2K4 was effectively reduced in glioblastomas with PFKFB3 LOH and a positive correlation with overall PFKFB3 expression was observed. The PFKFB3 LOH as well as the resulting low UBI2K4 expression level was associated with a poor prognosis of glioblastoma patients. It was concluded that LOH on 10p14-p15 in glioblastomas targets PFKFB3 and in particular splice variant UBI2K4, a putative tumor suppressor protein in glioblastomas (Fleischer et al., 2011).

Implicated in

Note
  
Entity Various cancers
Prognosis At least 6 alternatively spliced variants of PFKFB3 mRNA are known in humans (UBI2K1-6) (Figure 2). Thus, each might have a different contribution to prognosis of tumors. UBI2K5 and UBI2K6 are the predominant splice variants found in rapidly proliferating high-grade astrocytomas while the expression of UBI2K3 and UBI2K4 is mainly restricted to low-grade astrocytomas and non-neoplastic brain tissue (Zscharnack, 2009).
Oncogenesis Enhanced glycolysis is important for oncogenesis and for the survival and proliferation of cancer cells in the tumor microenvironment. Neoplastic cells metabolize abundant glucose relative to normal cells in order to satisfy the increased energetic and anabolic needs of the transformed state. Moreover, most of tumours are subjected to hypoxic conditions due to the abnormal vasculature that supply them with oxygen and nutrients. A key step in controlling glycolytic rate is Fru-2,6-P2 levels. This is controlled, in tumoral cells, mainly by PFKFB3 which, in turn, is activated by mitogenic, inflammatory and hypoxic stimuli, and is found to be constitutively expressed by several human leukemias and solid tumor cells (Bartrons and Caro, 2007; Chesney, 2006).
  
  
Entity Thyroid and ovarian cancer
Note Increments in the expression of PFKFB3 mRNA and protein were reported in ovarian and thyroid carcinomas using in situ hybridization and immunohistochemistry analysis (Atsumi et al., 2002).
  
  
Entity Breast cancer
Note PFKFB3 was firstly identified as a progesterone responding gene (PRG1) in human breast cancer cell lines (Hamilton et al., 1997). Afterwards, overexpression of PFKFB3 in T47D and MCF7 cells has been probed and the regulatory mechanism of the protein and gene regulation have been described (Novellasdemunt et al., 2012; Obach et al., 2004).
PFKFB3 has also been identified, using loss-of-function screen, as a gene required for cell growth and proliferation in CD44+CD24- human breast cancer cells (Marotta et al., 2011).
  
  
Entity Lung cancer
Note Heterozygotic genomic deletion of the inducible PFKFB3 gene in ras-transformed mouse lung fibroblasts suppresses Fru-2,6-P2 production, glycolytic flux to lactate, and growth as soft agar colonies or tumors in athymic mice (Atsumi et al., 2002; Telang et al., 2006).
  
  
Entity Gastric and pancreas cancer
Note The expression of PFKFB3 mRNA was observed in normal human gastric tissue and was increased in malignant gastric tumors. PFKFB3 gene is also expressed in gastric (MKN45, NUGC3) and pancreatic cancer cells (Panc1) which strongly respond to hypoxia via a HIF-1alpha dependent mechanism (Bobarykina et al., 2006).
  
  
Entity Colorectal cancer
Note PFKFB3 gene expression is controlled by insulin in the human colon adenocarcinoma HT29 cell line (Riera et al., 2002). Overexpression of PFKFB3 isoenzyme and particularly the phosphorylated form (phospho-PFKFB3 (Ser461)) has also been described in the human colon malignant tumors (Bando et al., 2005).
  
  
Entity Glioblastoma
Note PFKFB3 protein levels were markedly elevated in high-grade astrocytomas relative to low-grade astrocytomas and corresponding non-neoplastic brain tissue, whereas no significant increase of PFKFB3 mRNA was observed in high-grade astrocytomas when compared with control tissue. In the group of glioblastomas the PFKFB3 protein inversely correlates with EGFR expression. The findings demonstrate that PFKFB3 up-regulation is a hallmark of high-grade astrocytomas offering an explanation for high glycolytic flux and lactate production in these tumors (Kessler et al., 2008).
The study of the different PFKFB isoenzymes showed that the splice variant UBI2K4 impeded the tumour cell growth and might serve as a tumour suppressor in astrocytic tumours (Zscharnack, 2009). In this sense, loss of heterozygocity on 10p14-p15 was detected in 55% of glioblastomas and the allelic deletion of PFKFB3 splice variant UBI2K4 was associated with a poor prognosis (Fleischer et al., 2011).
  
  
Entity Neuronal diseases
Note Strong evidence of linkage to late-onset Alzheimer disease (LOAD) has been observed on chromosome 10, which implicates a wide region and at least one disease-susceptibility locus. Although significant associations with several biological candidate genes, such as PFKFB3, on chromosome 10 have been reported, these findings have not been consistently replicated, and they remain controversial (Grupe et al., 2006).
Increased expression of HIF- 1α, as well as its target genes, VEGF, and PFKFB3 in both major depressive and bipolar disorder patients have been found in a depressive state compared to healthy control subjects. The data suggest that altered expression of HIF-1 and its target genes mRNA in peripheral blood cells are associated - mainly in a state-dependent manner - with mood disorders. In addition, altered expression of HIF-1 and its target genes may be associated with the pathophysiology of depression (Shibata et al., 2013).
  
  
Entity Diabetes and obesity
Note Expression of PFKFB3 gene has been demonstrated in adipocytes (Atsumi et al., 2005). Single nucleotide polymorphism rs1064891, located in the 3' UTR of the 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase 3 (PFKFB3) gene, was nominally associated with obesity in combined analysis of human cohorts (Jiao et al., 2008). In addition, it has been found that disruption of PFKFB3 gene ameliorates diet-induced adiposity but exacerbates systemic insulin resistance and adipose tissue inflammatory response (Huo et al., 2010). In contrast, overexpression of ubiquitous 6-phosphofructo-2-kinase in the liver of transgenic mice results in weight gain (Duran et al., 2008b).
Pfkfb3 gene expression is increased in streptozotocin-induced diabetic mouse liver. During streptozotocin-induced diabetes, phosphorylation of both p38 mitogen-activated protein kinase and Akt was detected, together with the overexpression of the proliferative markers cyclin D and E2F. These findings indicate that PFKFB3 induction is coupled to enhanced hepatocyte proliferation in streptozotocin-induced diabetic mouse liver. Expression decreased when hepatocytes were treated with either rapamycin or LY 294002, suggesting that PFKFB3 regulation is phosphoinositide 3-kinase-Akt-mammalian target of rapamycin dependent (Duran et al., 2009).
  
  
Entity Inflamatories diseases (arthritis and coeliac disease)
Note Rheumatoid arthritis (RA) and coeliac disease (CD) are two autoimmune disorders which have similarities in their pathogenesis. In a meta-analysis of Dutch and UK data sets, shared association with six loci, one of them being PFKFB3 (Coenen et al., 2009).
The proinflammatory cytokine interleukin (IL)-6 enhanced glycolysis in mouse embryonic fibroblasts and human cell lines through STAT3 activation which enhanced the expression of the glycolytic PFKFB3 isoenzyme (Ando et al., 2010). Furthermore, cooperation of adenosine with macrophage Toll-4 receptor agonists leads to increased glycolytic flux through the enhanced expression of PFKFB3 gene, showing that, in macrophages, endogenously generated adenosine cooperates with bacterial components to increase PFKFB3 isoenzyme activity, resulting in greater Fru-2,6-P2 accumulation. This process enhances the glycolytic flux and favours ATP generation helping to develop and maintain the long term defensive and reparative functions of the macrophages (Ruiz-Garcia et al., 2011).
  
  
Entity Osteoporosis
Note PFKFB3 has been also associated with osteoclast differentiation by the immune system response or to various stimuli (Xiao et al., 2012).
  
  
Entity Targeting PFKFB3 for cancer therapy
Note PFKFB3 plays an important role in cancer cell metabolism and it has been considered as a potential target for cancer therapy. Different authors reported that PFKFB3 isoforms suppression inhibited anchorage-independent growth and induced cell-cycle delay, proposing that PFKFB3 protein product may serve as an essential downstream metabolic mediator of oncogenic ras (Calvo et al., 2006; Telang et al., 2006). The JAK2V617F oncogene requires expression of PFKFB3 for cell growth and increased metabolic activity. JAK2V617F as well as active STAT5 increases the expression of PFKFB3, which is required for JAK2V617F-dependent lactate production, oxidative metabolic activity and glucose uptake. Targeted Knockdown of PFKFB3 limited cell growth under normoxic and hypoxic conditions and blocked in vivo tumor formation in mice (Reddy et al., 2012).
Clinical development of PFKFB3 inhibitors as chemotherapeutic agents has been published (Clem et al., 2008, Seo et al., 2011). For example, a cell-permeable dipyridinyl-propenone (3PO) compound that selectively blocks PFK-2 (6-phosphofructo-2-kinase) activity has been found (Telang et al., 2006). 3PO decreases Fru-2,6-P2 and lactate production, arresting proliferation of transformed cells and suppressing tumor growth in several xenograft mouse models (Telang et al., 2006, Clem et al., 2008). In addition, other small molecule inhibitors (N4A, YN1) have been identified. When tested on cultured cancer cells both, N4A and YN1, inhibited PFKFB3, decreasing Fru-2,6-P2 concentration and glycolysis and, ultimately, led to cell death (Seo et al., 2011).
  
  
Entity KO and transgenic animals
Note Models of KO and transgenic animals have been developed showing that after disruption of the mouse PFKFB3 gene, no homozygous PFKFB3 (-/-) embryos were detected after 8 days of embryogenesis, indicating that the loss of PFKFB3 activity via targeted disruption of the gene leads to loss of embryonic cell proliferation, differentiation, and/or implantation. Serial analysis of gene expression has indicated that the mouse PFKFB3 mRNA becomes detectable during the blastocyst stage of embryogenesis. In contrast, normal phenotype is observed in PFKFB3 (+/-) mice despite the 50% reduction in PFKFB3 expression and activity (Chesney et al., 2005). Using PFKFB3-disrupted (PFKFB3+/-) mice, it has been shown that the animals are protected against diet-induced insulin resistance and adipose tissue inflammatory response (Huo et al., 2010).
A transgenic mouse model that overexpressed pfkfb3 and which was subjected to diet-induced obesity revealed production of high Fru-2,6-P2 levels and changes in hepatic gene expression profiles of key gluconeogenic and lipogenic enzymes, as well as an accumulation of lipids in periportal cells, and weight gain (Duran et al., 2008b).
  

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The PFKFB3 splice variant UBI2K4 is downregulated in high-grade astrocytomas and impedes the growth of U87 glioblastoma cells.
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Neuropathol Appl Neurobiol. 2009 Dec;35(6):566-78. doi: 10.1111/j.1365-2990.2009.01027.x. Epub 2009 Apr 15.
PMID 19490427
 

Citation

This paper should be referenced as such :
Novellasdemunt, L ; Navarro-Sabaté, À ; Manzano, A ; Rodriguez-Garcia, A ; Bartrons, R
PFKFB3 (6-phosphofructo-2-kinase/fructose-2,6-biphosphatase 3)
Atlas Genet Cytogenet Oncol Haematol. 2013;17(9):609-622.
Free journal version : [ pdf ]   [ DOI ]

Other Solid tumors implicated (Data extracted from papers in the Atlas) [ 4 ]
  t(10;10)(p12;p15) KIAA1217/PFKFB3
LARP4B/PFKFB3 (10p15)
PFKFB3/FAM208B (10p15)
t(10;20)(p15;q13) PFKFB3/ZNF831

External links

Nomenclature
HGNC (Hugo)PFKFB3   8874
Cards
AtlasPFKFB3ID45932ch10p15
Entrez_Gene (NCBI)PFKFB3    6-phosphofructo-2-kinase/fructose-2,6-biphosphatase 3
AliasesIPFK2; PFK2; iPFK-2
GeneCards (Weizmann)PFKFB3
Ensembl hg19 (Hinxton)ENSG00000170525 [Gene_View]
Ensembl hg38 (Hinxton)ENSG00000170525 [Gene_View]  ENSG00000170525 [Sequence]  chr10:6202932-6235532 [Contig_View]  PFKFB3 [Vega]
ICGC DataPortalENSG00000170525
TCGA cBioPortalPFKFB3
AceView (NCBI)PFKFB3
Genatlas (Paris)PFKFB3
SOURCE (Princeton)PFKFB3
Genetics Home Reference (NIH)PFKFB3
Genomic and cartography
GoldenPath hg38 (UCSC)PFKFB3  -     chr10:6202932-6235532 +  10p15.1   [Description]    (hg38-Dec_2013)
GoldenPath hg19 (UCSC)PFKFB3  -     10p15.1   [Description]    (hg19-Feb_2009)
GoldenPathPFKFB3 - 10p15.1 [CytoView hg19]  PFKFB3 - 10p15.1 [CytoView hg38]
ImmunoBaseENSG00000170525
genome Data Viewer NCBIPFKFB3 [Mapview hg19]  
OMIM605319   
Gene and transcription
Genbank (Entrez)AF056320 AF109735 AI633567 AJ227868 AJ272438
RefSeq transcript (Entrez)NM_001145443 NM_001282630 NM_001314063 NM_001323016 NM_001323017 NM_001363545 NM_004566
RefSeq genomic (Entrez)
Consensus coding sequences : CCDS (NCBI)PFKFB3
Alternative Splicing GalleryENSG00000170525
Gene ExpressionPFKFB3 [ NCBI-GEO ]   PFKFB3 [ EBI - ARRAY_EXPRESS ]   PFKFB3 [ SEEK ]   PFKFB3 [ MEM ]
Gene Expression Viewer (FireBrowse)PFKFB3 [ Firebrowse - Broad ]
GenevisibleExpression of PFKFB3 in : [tissues]  [cell-lines]  [cancer]  [perturbations]  
BioGPS (Tissue expression)5209
GTEX Portal (Tissue expression)PFKFB3
Human Protein AtlasENSG00000170525-PFKFB3 [pathology]   [cell]   [tissue]
Protein : pattern, domain, 3D structure
UniProt/SwissProtQ16875   [function]  [subcellular_location]  [family_and_domains]  [pathology_and_biotech]  [ptm_processing]  [expression]  [interaction]
NextProtQ16875  [Sequence]  [Exons]  [Medical]  [Publications]
With graphics : InterProQ16875
Splice isoforms : SwissVarQ16875
Catalytic activity : Enzyme2.7.1.105 [ Enzyme-Expasy ]   2.7.1.1052.7.1.105 [ IntEnz-EBI ]   2.7.1.105 [ BRENDA ]   2.7.1.105 [ KEGG ]   [ MEROPS ]
PhosPhoSitePlusQ16875
Domaine pattern : Prosite (Expaxy)PG_MUTASE (PS00175)   
Domains : Interpro (EBI)6Pfruct_kin    6Phosfructo_kin    His_Pase_superF_clade-1    His_PPase_superfam    P-loop_NTPase    PG/BPGM_mutase_AS   
Domain families : Pfam (Sanger)6PF2K (PF01591)    His_Phos_1 (PF00300)   
Domain families : Pfam (NCBI)pfam01591    pfam00300   
Domain families : Smart (EMBL)PGAM (SM00855)  
Conserved Domain (NCBI)PFKFB3
Blocks (Seattle)PFKFB3
PDB (RSDB)2AXN    2DWO    2DWP    2I1V    3QPU    3QPV    3QPW    4D4J    4D4K    4D4L    4D4M    4MA4    5AJV    5AJW    5AJX    5AJY    5AJZ    5AK0    6ETJ    6HVH    6HVI    6HVJ    6IBX    6IBY    6IBZ    6IC0   
PDB Europe2AXN    2DWO    2DWP    2I1V    3QPU    3QPV    3QPW    4D4J    4D4K    4D4L    4D4M    4MA4    5AJV    5AJW    5AJX    5AJY    5AJZ    5AK0    6ETJ    6HVH    6HVI    6HVJ    6IBX    6IBY    6IBZ    6IC0   
PDB (PDBSum)2AXN    2DWO    2DWP    2I1V    3QPU    3QPV    3QPW    4D4J    4D4K    4D4L    4D4M    4MA4    5AJV    5AJW    5AJX    5AJY    5AJZ    5AK0    6ETJ    6HVH    6HVI    6HVJ    6IBX    6IBY    6IBZ    6IC0   
PDB (IMB)2AXN    2DWO    2DWP    2I1V    3QPU    3QPV    3QPW    4D4J    4D4K    4D4L    4D4M    4MA4    5AJV    5AJW    5AJX    5AJY    5AJZ    5AK0    6ETJ    6HVH    6HVI    6HVJ    6IBX    6IBY    6IBZ    6IC0   
Structural Biology KnowledgeBase2AXN    2DWO    2DWP    2I1V    3QPU    3QPV    3QPW    4D4J    4D4K    4D4L    4D4M    4MA4    5AJV    5AJW    5AJX    5AJY    5AJZ    5AK0    6ETJ    6HVH    6HVI    6HVJ    6IBX    6IBY    6IBZ    6IC0   
SCOP (Structural Classification of Proteins)2AXN    2DWO    2DWP    2I1V    3QPU    3QPV    3QPW    4D4J    4D4K    4D4L    4D4M    4MA4    5AJV    5AJW    5AJX    5AJY    5AJZ    5AK0    6ETJ    6HVH    6HVI    6HVJ    6IBX    6IBY    6IBZ    6IC0   
CATH (Classification of proteins structures)2AXN    2DWO    2DWP    2I1V    3QPU    3QPV    3QPW    4D4J    4D4K    4D4L    4D4M    4MA4    5AJV    5AJW    5AJX    5AJY    5AJZ    5AK0    6ETJ    6HVH    6HVI    6HVJ    6IBX    6IBY    6IBZ    6IC0   
SuperfamilyQ16875
Human Protein Atlas [tissue]ENSG00000170525-PFKFB3 [tissue]
Peptide AtlasQ16875
HPRD05612
IPIIPI00004511   IPI00216306   IPI00922498   IPI00815865   IPI00478966   IPI00642529   IPI00442255   IPI00384559   IPI00639799   IPI00985406   IPI00645153   IPI00645625   IPI00641684   
Protein Interaction databases
DIP (DOE-UCLA)Q16875
IntAct (EBI)Q16875
Complex Portal (EBI)Q16875 CPX-1995 6-phosphofructo-2-kinase/fructose-2,6-biphosphatase 3 complex
BioGRIDPFKFB3
STRING (EMBL)PFKFB3
ZODIACPFKFB3
Ontologies - Pathways
QuickGOQ16875
Ontology : AmiGO6-phosphofructo-2-kinase activity  6-phosphofructo-2-kinase activity  fructose-2,6-bisphosphate 2-phosphatase activity  ATP binding  nucleoplasm  cytosol  cytosol  fructose metabolic process  fructose 2,6-bisphosphate metabolic process  dephosphorylation  positive regulation of glycolytic process  carbohydrate phosphorylation  
Ontology : EGO-EBI6-phosphofructo-2-kinase activity  6-phosphofructo-2-kinase activity  fructose-2,6-bisphosphate 2-phosphatase activity  ATP binding  nucleoplasm  cytosol  cytosol  fructose metabolic process  fructose 2,6-bisphosphate metabolic process  dephosphorylation  positive regulation of glycolytic process  carbohydrate phosphorylation  
Pathways : KEGGFructose and mannose metabolism    HIF-1 signaling pathway   
REACTOMEQ16875 [protein]
REACTOME PathwaysR-HSA-9634600 [pathway]   
NDEx NetworkPFKFB3
Atlas of Cancer Signalling NetworkPFKFB3
Wikipedia pathwaysPFKFB3
Orthology - Evolution
OrthoDB5209
GeneTree (enSembl)ENSG00000170525
Phylogenetic Trees/Animal Genes : TreeFamPFKFB3
HOGENOMQ16875
Homologs : HomoloGenePFKFB3
Homology/Alignments : Family Browser (UCSC)PFKFB3
Gene fusions - Rearrangements
Fusion : MitelmanKIAA1217/PFKFB3 [10p12.2/10p15.1]  
Fusion : MitelmanLARP4B/PFKFB3 [10p15.3/10p15.1]  
Fusion : MitelmanPFKFB3/FAM208B [10p15.1/10p15.1]  
Fusion : MitelmanPFKFB3/ZNF831 [10p15.1/20q13.32]  
Fusion PortalKIAA1217 10p12.2 PFKFB3 10p15.1 BRCA
Fusion PortalLARP4B 10p15.3 PFKFB3 10p15.1 BRCA
Fusion PortalPFKFB3 10p15.1 C10orf18 BRCA
Fusion PortalPFKFB3 10p15.1 ZNF831 20q13.32 SKCM
Fusion : FusionGDB2.7.1.105|3.1.3.46   
Fusion : Fusion_HubAL137145.1--PFKFB3    AL137145.2--PFKFB3    B2M--PFKFB3    CCNY--PFKFB3    DLG5--PFKFB3    ELOVL5--PFKFB3    HERC4--PFKFB3    IFITM1--PFKFB3    ISL1--PFKFB3    KIAA1217--PFKFB3    KRT13--PFKFB3    LARP4B--PFKFB3    MDH1B--PFKFB3    METRNL--PFKFB3    OAZ1--PFKFB3   
PFKFB3--ACTG1    PFKFB3--ADAM8    PFKFB3--AKR1C1    PFKFB3--ANKRD22    PFKFB3--ARAP1    PFKFB3--ARPC3    PFKFB3--ASRGL1    PFKFB3--ATP2A1    PFKFB3--B2M    PFKFB3--BANP    PFKFB3--C10ORF18    PFKFB3--C11ORF31    PFKFB3--CCDC22    PFKFB3--CD53    PFKFB3--CELF2   
PFKFB3--CORO6    PFKFB3--CXCL12    PFKFB3--DDX5    PFKFB3--DHX34    PFKFB3--DLGAP4    PFKFB3--ECM1    PFKFB3--ERBB2    PFKFB3--ERCC1    PFKFB3--FAM160B1    PFKFB3--FCAR    PFKFB3--GDI2    PFKFB3--GLUL    PFKFB3--GNAS    PFKFB3--GSTM2    PFKFB3--HIP1R   
PFKFB3--IFITM2    PFKFB3--IL15RA    PFKFB3--INPP5A    PFKFB3--KDM4B    PFKFB3--KIAA0368    PFKFB3--LZTS2    PFKFB3--MARK2    PFKFB3--MBP    PFKFB3--MED24    PFKFB3--MXI1    PFKFB3--NCOA5    PFKFB3--NOC4L    PFKFB3--NOTCH1    PFKFB3--NRAP    PFKFB3--OAZ1   
PFKFB3--PALM2-AKAP2    PFKFB3--PFKFB3    PFKFB3--PHF13    PFKFB3--PWWP2B    PFKFB3--RAC2    PFKFB3--RBM17    PFKFB3--RGS10    PFKFB3--RNF114    PFKFB3--RP11-563J2.2    PFKFB3--RP11-793H13.10    PFKFB3--S100A9    PFKFB3--SAMSN1    PFKFB3--SLC16A3    PFKFB3--SLC35E2B    PFKFB3--SOCS2   
PFKFB3--SQSTM1    PFKFB3--SUN1    PFKFB3--SVIL    PFKFB3--TMEM25    PFKFB3--TNNT3    PFKFB3--UBC    PFKFB3--UNC13D    PFKFB3--UROD    PFKFB3--XPO6    PFKFB3--ZMYND11    PFKFB3--ZNF831    RBM17--PFKFB3    RORA--PFKFB3    SBF1--PFKFB3    TBC1D2B--PFKFB3   
TEAD2--PFKFB3   
Fusion : QuiverPFKFB3
Polymorphisms : SNP and Copy number variants
NCBI Variation ViewerPFKFB3 [hg38]
dbVarPFKFB3
ClinVarPFKFB3
MonarchPFKFB3
1000_GenomesPFKFB3 
Exome Variant ServerPFKFB3
GNOMAD BrowserENSG00000170525
Varsome BrowserPFKFB3
Genomic Variants (DGV)PFKFB3 [DGVbeta]
DECIPHERPFKFB3 [patients]   [syndromes]   [variants]   [genes]  
CONAN: Copy Number AnalysisPFKFB3 
Mutations
ICGC Data PortalPFKFB3 
TCGA Data PortalPFKFB3 
Broad Tumor PortalPFKFB3
OASIS PortalPFKFB3 [ Somatic mutations - Copy number]
Somatic Mutations in Cancer : COSMICPFKFB3  [overview]  [genome browser]  [tissue]  [distribution]  
Somatic Mutations in Cancer : COSMIC3DPFKFB3
Mutations and Diseases : HGMDPFKFB3
LOVD (Leiden Open Variation Database)Whole genome datasets
LOVD (Leiden Open Variation Database)LOVD - Leiden Open Variation Database
LOVD (Leiden Open Variation Database)LOVD 3.0 shared installation
BioMutasearch PFKFB3
DgiDB (Drug Gene Interaction Database)PFKFB3
DoCM (Curated mutations)PFKFB3 (select the gene name)
CIViC (Clinical Interpretations of Variants in Cancer)PFKFB3 (select a term)
intoGenPFKFB3
NCG6 (London) select PFKFB3
Cancer3DPFKFB3(select the gene name)
Impact of mutations[PolyPhen2] [Provean] [Buck Institute : MutDB] [Mutation Assessor] [Mutanalyser]
Diseases
OMIM605319   
Orphanet
DisGeNETPFKFB3
MedgenPFKFB3
Genetic Testing Registry PFKFB3
NextProtQ16875 [Medical]
GENETestsPFKFB3
Target ValidationPFKFB3
Huge Navigator PFKFB3 [HugePedia]
ClinGenPFKFB3
Clinical trials, drugs, therapy
MyCancerGenomePFKFB3
Protein Interactions : CTD
Pharm GKB GenePA33213
Clinical trialPFKFB3
Miscellaneous
canSAR (ICR)PFKFB3 (select the gene name)
HarmonizomePFKFB3
DataMed IndexPFKFB3
Probes
Litterature
PubMed115 Pubmed reference(s) in Entrez
GeneRIFsGene References Into Functions (Entrez)
EVEXPFKFB3
REVIEW articlesautomatic search in PubMed
Last year publicationsautomatic search in PubMed

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