Abstract
The activation of cells by a wide variety of stimuli leads to rapid changes in 3-phosphorylated inositol lipids through the action of a family of enzymes known as phosphoinositide 3-kinases (PI3-Ks). PI3-K activation is central to the coordinated control of multiple cell signaling pathways leading to cell growth, cell proliferation, cell survival, and cell migration. The PI3-Ks have been classified into three groups according to their primary sequence and domain structure, mode of regulation, and substrate specificity in vitro (Fig. 1) (1). The class IA PI3-K subgroup consist of three catalytic subunits, p110α, β, and δ, which form heterodimers with one of five SH2 (Shc homology) domain-containing regulatory subunits, p85α, p85β, p55γ, p55α, and p50α. The class IA heterodimer can be recruited either directly to cell surface receptors, e.g., growth factor receptors, or indirectly by adaptor molecules such as Shc, growth factor receptor bound protein, (Grb2) or insulin receptor substrate (IRS)-1 (2). P110δ was originally identified in leukocytes but is also expressed in other cell types including breast tissue and melanocytes (3). The p110α and p110β isoforms are ubiquitous. Class IB consists of one member, a heterodimer of p110γ and a regulatory subunit termed p101, and is activated by G protein βγ subunits following the stimulation of G protein-coupled receptors (GPCRs). The expression of p110γ is predominantly in leukocytes but this isoform is also found in cardiac tissue. Both class IA and IB catalyze the formation of PtdIns (3,4,5)P3 in vitro and in addition to regulation by cell surface receptors, they can be activated directly by the small GTPase, Ras (4).
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Finan, P.M., Ward, S.G. (2006). PI3-Kinase Inhibition. In: Fabbro, D., McCormick, F. (eds) Protein Tyrosine Kinases. Cancer Drug Discovery and Development. Humana Press. https://doi.org/10.1385/1-59259-962-1:053
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DOI: https://doi.org/10.1385/1-59259-962-1:053
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