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Entity | Prostate adenocarcinoma |
Note | In 1998, Kadkol et al. used in situ hybridization techniques to compare ANP32A expression in prostatic adenocarcinoma with expression in benign prostatic hyperplasia. While finding only moderate expression in the basal cells, 98% of prostatic adenocarcinomas with high Gleason scores demonstrated elevated levels of ANP32A (Kadkol et al., 1998). In an effort to clarify the paradoxical finding of elevated levels of a tumor suppressor in transformed pancreatic adenocarcinoma tissue, in 1999 Kadkol and colleagues compared the sequence and function of members of this phosphoprotein family in a series of three patient tumors (compared to adjacent normal prostate tissue). They found ANP32A to be expressed in normal tissue, while closely related gene products pp32r1 and pp32r2 were dominant in the tumor samples (Kadkol et al., 1999). In 2001, Bai et al. continued the focus from this laboratory on ANP32A with experiments aimed to clarify its tumor suppressor function. They utilized the fibroblast cell line NIH3T3 and showed that anti-sense inhibition of ANP32A lead to reduced serum dependence and loss of contact inhibition. They further demonstrated that ANP32A expression abrogated ras-mediated transformation in both in-vitro and in-vivo models (Bai et al., 2001). Continuing work from the same laboratory, Brody and colleagues reported in 2004 that reduction of ANP32A expression in a prostate carcinoma cell line induced transformation into a neuronal phenotype associated with growth arrest. This change was associated with reduced SET expression and changes to the acetylation status of histone H4. Further downstream changes in gene expression were noted with effects pathways including: cell cycle, MAP kinases, apoptosis, cytokines, metabolism, PP2A, p53 stabilization, and growth factor receptors (Brody et al., 2004). Finally, in 2011 Schramedei et al. reported results from a proteomic analysis of changes following miR-21 expression in LNCaP prostate cancer cells. They found ANP32A to be the most strongly down-regulated protein upon miR-21 expression suggesting a regulatory role of miR-21 on ANP32A expression. They also found that enhanced cell viability conferred by miR-21 expression in this prostate cancer cell line was mimicked by direct ANP32A knock-down and mitigated by ANP32A overexpression (Schramedei et al., 2011). |
Prognosis | Increased ANP32A is associated with higher Gleason score in prostate adenocarcinoma despite equivalent rates of capsular invasion, seminal vesical invasion, and positive surgical margins at the time of resection (Kadkol et al., 1998). |
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Entity | Pancreatic cancer |
Note | In 2007, Brody et al. found dramatically decreased levels of ANP32A in poorly differentiated pancreatic tumors and intraductal papillary mucinous neoplasms with moderate dysplasia when compared to healthy pancreatic tissue or well-to-moderately differentiated tumors. Exogenous overexpression of ANP32A in a low-expression pancreatic cancer cell line lead to increased G1 arrest (Brody et al., 2007). In 2010, Williams and colleagues extended earlier work from the same group by associating low nuclear ANP32A levels with both high grade pancreatic tumors and the presence of lymph node metastasis. Overexpression of ANP32A conferred resistance to therapy with nucleoside analogs gemcitabine and cytarabine while increasing sensitivity to 5-fluorouracil therapy. In accordance with this result, silencing of ANP32A enhanced sensitivity to gemcitabine. A novel interaction with the RNA-binding protein ELAVL1 was described, whereby ANP32A disrupted binding between ELAVL1 and mRNA transcripts such as doxycytidine kinase (dCK) and VEGF. Notably, dCK is the enzyme responsible for metabolism of gemcitabine from its prodrug to active metabolites (Williams et al., 2010). |
Prognosis | In contrast to findings in the prostate, in pancreatic adenocarcinoma ANP32A is absent or greatly reduced in poorly differentiated tumor when compared to normal pancreatic tissue, early dysplasia, and even well differentiated adenocarcinomas (Brody et al., 2007; Williams et al., 2010). |
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Entity | Breast cancer |
Note | In 2001, Kadkol and colleagues investigated the interplay between members of this phosphoprotein family (ANP32A, pp32r1, and pp32r2) in human breast cancer specimens as compared to benign tissue. After showing abundant protein belonging to this family in 100 of 102 specimens examined, they compared relative expression of each family member in five infiltrating breast carcinomas (compared to matching benign breast tissue). Four of five carcinomas continued to express ANP32A (at levels similar to that of the benign samples), however the expression of pp32r1 and pp32r2 was unique to the carcinomas (Kadkol et al., 2001). In 2006, Schafer et al. utilized a breast cancer model of chemotherapeutic-induced cytochrome-c mediated apoptosis. They found that breast cancer cells were hyper-sensitive to cytochrome-c mediated apoptosis as compared to normal cells. This hypersensitivity resulted in increased caspase 9 activation in a manner that was mediated by increased ANP32A protein (Schafer et al., 2006). |
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Entity | Non-small cell lung cancer |
Note | In 2008, Hoffarth and colleagues evaluated the effects of exogenous ANP32A expression on drug resistant non-small cell lung cancer cell (NSCLC) lines. They were able to correlate drug resistance with impaired caspase 9 and caspase 3 activation despite formation of the cytochrome-c induced apoptosome. Expression of ANP32A restored apoptosome activation both in vitro and murine in vivo models. Finally, they correlated improved outcomes following chemotherapy in human NSCLC patients with expression of ANP32A on immunohistochemical staining of tumor samples (Hoffarth et al., 2008). |
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Entity | Hepatocellular carcinoma |
Note | In 2012, Li and colleagues surveyed abnormal protein expression in hepatocellular carcinoma utilizing two-dimensional liquid chromatography-tandem mass spectrometry. Elevated expression of ANP32A was validated by western blot analysis and immunohistochemical staining of a tissue microarray comprised of 59 cases (Li et al., 2012). |
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Entity | Colorectal cancer |
Note | In 2011, Shi et al. profiled the proteome changes found in laser capture microdissection samples of colorectal cancer. Amongst several novel protein changes found, ANP32A was overexpressed in tumor when compared to normal tissue (Shi et al., 2011). |
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Entity | Neurotoxicity/neurodegenerative disease |
Note | An association with Rb-mediated gene repression plays a key role in neuronal protection against excitotoxicity (Khan et al., 2011). May contribute to altered tau protein phosphorylation contributing to the pathophysiology of Alzheimer's disease (Tsujio et al., 2005; Kovacech et al., 2007). In the cerebellum it is primarily located in the nucleus of Purkinje cells where it interacts with ataxin-1, the gene product in spinocerebellar ataxia type 1 (Matilla et al., 1997). |
Disease | Proposed: Alzheimer's disease, spinocerebellar ataxia type 1. |
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Entity | Cellular response to immunomodulatory and inflammatory factors |
Note | Interacts with STAT1/STAT2 and modulates transcriptional complex binding to interferon-stimulated gene promoters (Kadota and Nagata, 2011). Regulates cell signaling in response to inflammatory gene expression through target inhibition of protein phosphatase 2A (Khan et al., 2011). Association with HLA class II molecule DR2 alpha chain has yet to be fully elucidated (Vaesen et al., 1994). |
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Entity | Embryogenesis |
Note | In a survey of this family of leucine-rich repeat genes, ANP32A was necessary for murine embryogenesis in a background of ANP32B absence (Reilly et al., 2011). |
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Entity | Virology |
Note | ANP32A is required for adeno-associated virus replication in human cell line studies as a member of the template activating factor-I/SET oncoprotein complex (Pegoraro et al., 2006). As part of this process, nuclear-to-cytoplasmic shuttling with HuR takes place in a manner dependent on E4orf6 protein function (Higashino et al., 2005). |
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