Database for Annotation, Visualization and Integrated Discovery 2.1
National Institute of Allergy and Infectious Disease
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phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit beta(PIK3CB) phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit beta(PIK3CB) Related Genes Homo sapiens
CYTOBAND 3q22.3,
GENERIF_SUMMARY These results indicate that in addition to their roles in recruiting the catalytic subunit of PI3K to the insulin receptor substrate proteins, both p85alpha and p85beta play negative roles in insulin signaling, A function for phosphoinositide 3-kinase beta lipid products in coupling beta gamma to Ras activation in response to lysophosphatidic acid., It is unlikely that the promoter polymorphisms -359T/C and -303A/G of the catalytic subunit p110beta gene of human PI 3-kinase have a major impact on insulin secretion, insulin sensitivity, or the risk of type 2 diabetes, p110 has a role in activation of PI3K gamma along with G beta gamma, determinination of the involvement of PI3K and MAPK pathways and the importance of cross-talk between these pathways, in glucose-potentiated vascular smooth muscle cell chemotaxis to serum factors, Data highlight the differential signaling by p110alpha and -beta isoforms., Introduction of a pH1 vector producing shRNA (short hairpin RNA) that targets p110beta abolished PIA [N6-(2-phenylisopropyl)adenosine]-induced Akt activation, although introduction of activating mutations from p110alpha at the corresponding sites in p110beta failed to render the enzyme oncogenic in human cells, the possibility remains that other mutations might activate the beta isoform, p110beta, -gamma, and -delta isoforms of class I phosphoinositide 3-kinase have roles in oncogenic transformation, Reduced activation of NF-kappaB via impaired PI3K/Akt activation under increased TNF-alpha levels could result in increased apoptosis of vitiliginous keratinocytes., bFGF augments hypoxia induced VEGF release in breast cancer cells mainly through the PI3K pathway and partly depending on HIF-1 activity., C allele is a causal variant capable of attenuating insulin resistance in obese children., Our data indicate that different signalling pathways are involved in retinoic acid-induced up-regulation of the secretases., PI3Kalpha and -beta present distinct activation requirements and kinetics in G(1) phase, with a selective action of PI3Kalpha at the G(0)/G(1) phase transition, Phosphoinositide 3-kinase p110beta inhibitor TGX-221 inhibited shear-induced platelet activation and protected platelet function during extracorporeal circulation., p85alpha and p110beta are essential for androgen-stimulated AR transactivation, and their aberrant expression or activation might play an important role in prostate cancer progression, required for sphingosine-1-phosphate -induced endothelial cell migration through activation of Rac1, Although p110alpha activation is required to sustain the proliferation of established PIK3CA-mutant tumors, PTEN-deficient tumors are dependent instead on p110beta signaling., Rs361072 promoter variant of PIK3CB is associated with insulin resistance not with type 2 diabetes., PI3K p110beta positively controls lipopolysaccharide-induced interleukin-12 production through the c-jun kinase (JNK)-1-dependent pathway in human macrophages and dendritic cells., PI3Kbeta plays an essential role in GPVI-mediated platelet aggregation and Akt activation, phosphoinositide 3-kinase isoforms alpha and beta have roles in glycoprotein VI-induced platelet signaling and thrombus formation, Our results support the concept that p110beta appears to be the predominant functional class I PI 3-kinase isoform in prostate cancer cells., Data show that similar responses were seen in cancer cells with wild-type or activated mutant PI3K genes treated with p110alpha/delta or p110alpha/beta/delta inhibitors in cell viability assays., minor G allele of PIK3CB associates with decreased muscle subunit ratio and lower hepatic glucose production at high plasma insulin levels., This study shows that the enhanced transforming potential of p110beta is the result of its decreased inhibition by p85, due to the disruption of an inhibitory C2-iSH2 domain interface., In hyperglycemic leptin-deficient Lep(ob/ob) transgenic mice, leptin acutely and potently improves glucose metabolism, before any change of body fat mass, via a mechanism involving the p110alpha and -beta isoforms of phosphatidylinositol-3-kinase., Significance of this altered regulation in tumor models of PTEN deletion, as well as the potential implications of the unique p110beta regulation on GPCR-driven tumorigenesis., lipid kinase p110beta/p85beta elucidates an unusual SH2-domain-mediated inhibitory mechanism, study shows that p110beta nuclear localization signal and p85beta nuclear export sequence regulate p85beta/p110beta nuclear localization, supporting the idea that nuclear, but not cytoplasmic, p110beta controls cell survival, Results define PI3Kbeta as a potential therapeutic target in inflammatory disease., This paper reports the first purification of a phosphoinositide 3-kinase and shows that the protein is a heterodimer of an 85 kd regulatory subunit that mediates binding to phosphorylated proteins and a 110 kd catalytic subunit., results suggested that down-regulation of p110beta expression by siRNA obviously reduced cell number via accumulation in G(0)-G(1) phase of the cell cycle., Combined blockade of P2Y12, P2Y1 and PI3-kinase p110beta fully prevents platelet and leukocyte activation during hypothermic extracorporeal circulation., Phosphoinositide 3-kinase C2beta regulates RhoA and the actin cytoskeleton through an interaction with Dbl, p110beta was activated near metaphase and controlled dynein/dynactin and Aurora B activities in kinetochores, chromosome segregation, and optimal function of the spindle checkpoint, Disrupting the p110beta-Gbetagamma interaction by mutation or with a cell-permeable peptide inhibitor blocked the transforming capacity of PI3Kbeta in fibroblasts and reduced the proliferation, chemotaxis, and invasiveness, Data indicate that phosphatidylinositol 3'-kinase (PI3K) alpha and beta p110 isoforms of PI3K are broadly expressed in myeloma., In mammalian cells, p110beta acts as a molecular sensor for growth factor availability and induces autophagy by activating a Rab5-mediated signaling cascade., p110alpha acts as a negative regulator of beta cell exocytosis and insulin secretion, while p110beta is a positive regulator of insulin secretion through a mechanism separate from its catalytic activity, Data sugget that the E633K mutant activates p110beta by enhancing its basal association with membranes., genetic association study in a population in Sweden, HSP20 directly associates with PI3K subunits and suppresses its activity in hepatocellular carcinoma, resulting in the inhibition of the AKT pathway, and subsequently decreasing the growth of hepatocellular carcinoma., PI3Kbeta expression was elevated significantly in lung squamous cell carcinomas (SCC) compared with adenocarcinomas, Results show that cell stimulation promotes p110alpha and p110beta association, demonstrating oligomerization of PI3K catalytic subunits within cells., The score was higher in metastatic compared to primary lesions (P<0.001) and was significantly associated with potential measures of PI3K activation, Phosphoinositide 3-kinase beta mediates microvascular endothelial repair of thrombotic microangiopathy., PI3Kbeta regulates the nuclear envelope through upstream regulation of RCC1 and Ran, Platelet PI3Kbeta and GSK3 regulate thrombus stability at a high shear rate., PIK3CB is critically involved in response to preoperative radiotherapy and may serve as a novel target for therapeutic intervention., The expression of both PIK3CA and PIK3CB is increased and related to the development and progress of colorectal carcinoma and multidrug resistance, Overexpression of P110BETA accelerated differentiation in C2C12 cells and primary human myoblasts through an Akt-dependent mechanism, while expression of kinase-inactive P110BETA had the opposite effect., Our findings provide new insight into the genetic mechanisms underlying PI3K pathway activation in human tumors and indicate that PIK3Cb(D1067V) is a rational therapeutic target in certain cancers., TNFR1 Regulates Ovarian Cancer Cell Tumorigenicity Through PIK3CB-p110Beta, Collectively, these results highlight the cleavage of shp-1 as a critical event in reprogramming LPS pathway to promote both neutrophil recruitment and survival and provide a novel mechanistic framework for the investigation of the post-traumatic MODS., expression levels distinguish chronic lymphocytic leukemia B cells from normal B lymphocytes, miR-130a plays a critical role in attenuation of cardiac dysfunction and remodeling after myocardial infarction. The mechanisms involve activation of PI3K/Akt signaling via suppression of PTEN expression., our findings provide for the first time that PF-04691502 inhibits the constitutively activated PI3K/mTOR pathway in aggressive B-cell NHL cell lines associated with inhibition of cell cycle progression, cell proliferation and promotion of apoptosis., The results of this study demomstrated that PI3 kinase mutations as novel prognostic markers in gliomas., PIK3CB D1067Y mutant behaved as an oncogene and transformed normal cells, an activity that was enhanced by PTEN depletion., Our study demonstrates that CSE/H2S system is regulated by miR-216a, and regulates ABCA1-mediated cholesterol efflux and cholesterol levels through the PI3K/AKT pathway., The data provide the first evidence that SJP protects SH-SY5Y cells against 6-OHDA toxicity possibly by inhibiting MAPK and NF-kappaB and activating PI3K/Akt signaling pathways., Our results demonstrated the pro-inflammatory and angiogenic effects of PlGF on HIMECs in IBD through activation of PI3K/Akt signaling pathway. PlGF/PI3K/Akt signaling may serve as a potential therapeutic target for IBD., Mefloquine acts on gastric cancer cells via suppressing PI3K/Akt/mTOR pathway., Our data suggested a potential role of Rab11-FIP2 in tumor progression and provided novel insights into the mechanism of how Rab11-FIP2 positively regulated cell migration and invasion in CRC cells., Our study demonstrates that the IGF1R/p110b/AKT/mTOR axis confers resistance to BYL719 in PIK3CA mutant breast cancers.,
SP_COMMENT catalytic activity:ATP + 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate = ADP + 1-phosphatidyl-1D-myo-inositol 3,4,5-trisphosphate., function:Phosphorylates PtdIns, PtdIns4P and PtdIns(4,5)P2 with a preference for PtdIns(4,5)P2., pathway:Phospholipid metabolism; phosphatidylinositol phosphate biosynthesis., similarity:Belongs to the PI3/PI4-kinase family., similarity:Contains 1 PI3K/PI4K domain., subunit:Heterodimer of a p110 (catalytic) and a p85 (regulatory) subunit., tissue specificity:Expressed ubiquitously.,