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J Biol Chem, Vol. 275, Issue 9, 6417-6420, March 3, 2000
From the Departments of Medicine and The inositol 1,4,5-trisphosphate receptor
(IP3R) is a calcium (Ca2+) release
channel found on the endoplasmic reticulum of virtually all types of
cells. Human T lymphocytes (Jurkat) that are made deficient in
IP3R do not generate Ca2+ signals in response
to T cell receptor stimulation, fail to translocate the nuclear factor
for activated T cells to the nucleus, and are remarkably resistant to
induction of apoptosis with CD95 (Fas), dexamethasone,
Calcineurin Is Downstream of the Inositol 1,4,5-Trisphosphate
Receptor in the Apoptotic and Cell Growth Pathways*
§
Pharmacology,
Molecular Cardiology Program, College of Physicians and Surgeons of
Columbia University, New York, New York 10032
irradiation,
and T cell receptor stimulation using anti-CD3 antibody. Expression of
constitutively active calcineurin A in IP3R-deficient T
cells restored nuclear factor for activated T cells translocation to
the nucleus and dephosphorylation of Bad and rendered the cells
sensitive to apoptotic inducers. Induction of apoptosis required both
active calcineurin A (
CnA) and activation-dependent colocalization of CnA with its substrate. Thus, the
Ca2+-dependent phosphatase calcineurin (CnA) is
downstream of the IP3R in both the cell growth and
apoptotic signaling pathways.
*
This work was supported by National Institutes of Health
(NIH) Grants AI39794, HL56180, and HL61503 (to A. R. M.), the
American Heart Association (to A. R. M. and T. J.), the
Richard and Lynne Kaiser Family Foundation (to A. R. M.), and
by NIH Shared Instrumentation Grants 1S10 RR10506 and 5P30 CA13696.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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