{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPIK3R2, which encodes the regulatory subunit p85β of phosphoinositide 3‐kinase (PI3K), is fundamental to the assembly and function of the PI3K holoenzyme. Early biochemical purification studies demonstrated that p85β forms a tight complex with a p110 catalytic subunit, conferring substrate specificity and activity modulation (1:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " Subsequent genetic analyses established that de novo mutations in PIK3R2 lead to overgrowth syndromes such as MPPH, underscoring its critical role in proper brain and vascular development (2:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": " Moreover, studies in endometrial cancer have shown that frequent, gain‐of‐function mutations in PIK3R2, along with mutations in related PI3K pathway components, promote oncogenic pathway activation (3:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " In vascular endothelial cells, PIK3R2 is further subject to post‐transcriptional regulation by microRNAs – for instance, miR‐126 directly targets its mRNA to modulate VEGF/PI3K/AKT signaling, impacting angiogenic balance (4:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " Viral proteins, such as influenza A virus NS1, interact with p85β through defined SH3‐binding motifs to hijack PI3K activity, enhancing cell survival during infection (5:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": " In parallel, regulatory mechanisms controlling p85β stability have been described, with the F‐box protein FBXL2 promoting its degradation via the ubiquitin–proteasome pathway (6:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": ", while interactions with tumor suppressors such as PTEN further integrate p85β into the negative regulation of PI3K signaling (7:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": " Structural and functional studies have also refined our understanding of p85β’s role in inhibiting or supporting the catalytic subunit via dynamic inter‐domain contacts, with insights drawn from mutation models implicating its regulatory interfaces (8:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": "; 9:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": " Furthermore, distinct subcellular localization––including a role in controlling nuclear entry of p110β––has been ascribed to the p85β regulatory module, thereby linking nuclear signaling events with lipid kinase activity (10:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn cancer and other pathological states, aberrant expression or mutation of PIK3R2 plays a prominent role in driving PI3K/AKT pathway activation. For example, mesothelin has been shown to promote tyrosine phosphorylation of p85, leading to increased expression of anti‐apoptotic Bcl-2 family proteins and chemoresistance (11:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": " Elevated p85β levels in breast and colon carcinomas correlate with robust PI3K signaling and enhanced invasiveness (12:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": ", and similar patterns have been observed in rheumatoid arthritis synovial fibroblasts where dysregulation of miR‐126 relieves repression of PIK3R2, promoting cell proliferation and survival (13:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "13"}]}, {"type": "t", "text": " In the context of neurodevelopmental malformations, genetic studies have further implicated PIK3R2 mutations with bilateral perisylvian polymicrogyria (14:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "14"}]}, {"type": "t", "text": ", while exosomal delivery of miR‐126 has been employed to modulate PIK3R2 levels and stimulate reparative angiogenesis (15:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "15"}]}, {"type": "t", "text": " PI3K signaling modulated by PIK3R2 has also been linked to insulin-like growth factor responses in vascular smooth muscle, implicating it in hyperglycemic conditions (16:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "16"}]}, {"type": "t", "text": ", and its modulation by miR‐126 in rheumatoid arthritis has been validated through molecular and functional assays (17:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "17"}]}, {"type": "t", "text": " Detailed mapping of the NS1–p85β interaction reveals that precise amino acid determinants in p85β (and reciprocal elements in NS1) underpin enhanced PI3K/Akt activation and viral antiapoptotic strategies (18:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "18"}]}, {"type": "t", "text": ", an interaction that is also critical for receptor internalization processes such as that of the erythropoietin receptor (19:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "19"}]}, {"type": "t", "text": " Broad pan‐cancer surveys reiterate that upregulation of PIK3R2 is detrimental to survival, reinforcing its role as an oncogenic driver (20:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "20"}]}, {"type": "t", "text": ", while studies in hepatitis C virus infection attribute a portion of downstream beta‐catenin stabilization to NS5A–p85β interactions (21:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "21"}]}, {"type": "t", "text": " In gastric cancer, miR‐126 targets PIK3R2 to inhibit proliferation and promote apoptosis (22:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "22"}]}, {"type": "t", "text": ", and in trastuzumab-resistant breast cancer cells, modulating miR‐126 levels reverses resistance via downregulating PIK3R2 and attenuating PI3K/AKT/mTOR signaling (23:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "23"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond these mechanistic insights, a range of studies have highlighted the broader regulatory network surrounding PIK3R2, including post-transcriptional controls by microRNAs and long noncoding RNAs, as well as modulation by cellular ubiquitin machinery. Interfering peptides and domains, such as heterologously expressed SH3 motifs, can disrupt the NS1–p85β association, thereby dampening PI3K/Akt pathway activation during viral infections (24:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "24"}]}, {"type": "t", "text": " Novel tumor suppressor microRNAs like miR‐3151 and miR‐126 have been identified as key negative regulators of PIK3R2 in chronic lymphocytic leukemia (25:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "25"}]}, {"type": "t", "text": "and prostate cancer (26:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "26"}]}, {"type": "t", "text": ", while similar regulatory circuits are being explored in thyroid carcinoma (27:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "27"}]}, {"type": "t", "text": "and other malignancies. Aberrant miR‐126 expression also contributes to oncogenic programs in thyroid and other cancers by relieving repression on PIK3R2 (28:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "28"}]}, {"type": "t", "text": ", and oncogenic receptor tyrosine kinases such as FGFR3 coordinate with p85 subunits to influence downstream PI3K activation (29:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "29"}]}, {"type": "t", "text": " In lung squamous cell carcinoma, high PIK3R2 expression underpins tumor progression independent of other PI3K pathway mutations (30:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "30"}]}, {"type": "t", "text": ", while its dysregulation in Kaposi’s sarcoma and chronic lymphocytic leukemia further supports its central role in tumor survival and resistance (31:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "31"}]}, {"type": "t", "text": "; 32:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "32"}]}, {"type": "t", "text": " Additional layers of regulation are imparted through deubiquitylating enzymes like USP49 that stabilize PTEN, indirectly tuning PI3K signaling via p85β (33:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "33"}]}, {"type": "t", "text": ", and kinases such as FER phosphorylate adaptor proteins (e.g. IRS4) to recruit p85β and potentiate PI3K activation (34:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "34"}]}, {"type": "t", "text": " These infectious and signaling paradigms are reiterated by further observations on the NS1–p85β interplay in influenza infection (35:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "35"}]}, {"type": "t", "text": ", and by evidence that tumor suppressor miR‐1226 directly targets PIK3R2 (36:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "36"}]}, {"type": "t", "text": " Disruption of such interactions using heterologous domains can attenuate PI3K/Akt signaling and viral propagation (37:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "37"}]}, {"type": "t", "text": ", while long noncoding RNAs like HOTAIR modulate synovial angiogenesis through a miR‐126/PIK3R2 axis in rheumatoid arthritis (38:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "38"}]}, {"type": "t", "text": " Lastly, in ovarian cancer, EGFR signaling responses and resistance mechanisms depend, in part, on PIK3R2 expression levels (39:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "39"}]}, {"type": "t", "text": ", murine models have been developed to recapitulate human PIK3R2 mutations linked with brain overgrowth (40:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "40"}]}, {"type": "t", "text": ", high-resolution structural work has further detailed the conformation of the p85β iSH2 domain (41:"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "41"}]}, {"type": "t", "text": ", and emerging evidence in melanoma underscores its oncogenic potential in diverse tumor settings (42:."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "42"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "C L Carpenter, B C Duckworth, K R Auger, et al. 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