Impaired B and T Cell Antigen Receptor Signaling in p110δ PI 3-Kinase Mutant Mice

Science  09 Aug 2002:
Vol. 297, Issue 5583, pp. 1031-1034
DOI: 10.1126/science.1073560

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Class IA phosphoinositide 3-kinases (PI3Ks) are a family of p85/p110 heterodimeric lipid kinases that generate second messenger signals downstream of tyrosine kinases, thereby controlling cell metabolism, growth, proliferation, differentiation, motility, and survival. Mammals express three class IA catalytic subunits: p110α, p110β, and p110δ. It is unclear to what extent these p110 isoforms have overlapping or distinct biological roles. Mice expressing a catalytically inactive form of p110δ (p110δD910A) were generated by gene targeting. Antigen receptor signaling in B and T cells was impaired and immune responses in vivo were attenuated in p110δ mutant mice. They also developed inflammatory bowel disease. These results reveal a selective role for p110δ in immunity.

  • * These authors contributed equally to this report.

  • Present address: Roslin Institute, Roslin, Midlothian, EH25 9PS, UK.

  • To whom correspondence should be addressed. E-mail: bartvanh{at}

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