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T and B‐cell signaling in activated PI3K delta syndrome: From immunodeficiency to autoimmunity
Author(s) -
Preite Silvia,
GomezRodriguez Julio,
Cans Jennifer L.,
Schwartzberg Pamela L.
Publication year - 2019
Publication title -
immunological reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.839
H-Index - 223
eISSN - 1600-065X
pISSN - 0105-2896
DOI - 10.1111/imr.12790
Subject(s) - biology , pi3k/akt/mtor pathway , autoimmunity , germinal center , microbiology and biotechnology , immunology , t cell , b cell , immune system , signal transduction , cancer research , antibody
Abstract Phosphatidylinositol 3 kinases (PI3K) are a family of lipid kinases that are activated by a variety of cell‐surface receptors, and regulate a wide range of downstream readouts affecting cellular metabolism, growth, survival, differentiation, adhesion, and migration. The importance of these lipid kinases in lymphocyte signaling has recently been highlighted by genetic analyses, including the recognition that both activating and inactivating mutations of the catalytic subunit of PI3Kδ, p110δ, lead to human primary immunodeficiencies. In this article, we discuss how studies on the human genetic disorder “Activated PI3K‐delta syndrome” and mouse models of this disease ( Pik3cd E1020K/+ mice) have provided fundamental insight into pathways regulated by PI3Kδ in T and B cells and their contribution to lymphocyte function and disease, including responses to commensal bacteria and the development of autoimmunity and tumors. We highlight critical roles of PI3Kδ in T follicular helper cells and the orchestration of the germinal center reaction, as well as in CD8 + T‐cell function. We further present data demonstrating the ability of the AKT‐resistant FOXO1 AAA mutant to rescue IgG1 class switching defects in Pik3cd E1020K/+ B cells, as well as data supporting a role for PI3Kδ in promoting multiple T‐helper effector cell lineages.