Junctional membrane inositol 1,4,5-trisphosphate receptor complex coordinates sensitization of the silent EGF-induced Ca2+ signaling

Title
Junctional membrane inositol 1,4,5-trisphosphate receptor complex coordinates sensitization of the silent EGF-induced Ca2+ signaling
Authors
Huh, Y.H.; Yoo, S.H.
Keywords
PROTEIN-KINASE-A, PROTEIN-KINASE-A, METABOTROPIC GLUTAMATE RECEPTORS, POSTTRAUMATIC-STRESS-DISORDER
Issue Date
2005-05
Publisher
ROCKEFELLER UNIV PRESS
Abstract
Ca2+ is a highly versatile intracellular signal that regulates many different cellular processes, and cells have developed mechanisms to have exquisite control over Ca2+ signaling. Epidermal growth factor ( EGF), which fails to mobilize intracellular Ca2+ when administrated alone, becomes capable of evoking [Ca2+](i) increase and exocytosis after bradykinin (BK) stimulation in chromaffin cells. Here, we provide evidence that this sensitization process is coordinated by a macromolecular signaling complex comprised of inositol 1,4,5- trisphosphate receptor type I(IP(3)R1), cAMP- dependent protein kinase (PKA), EGF receptor (EGFR), and an A-kinase anchoring protein, yotiao. The IP3R complex functions as a focal point to promote Ca2+ release in two ways: (1) it facilitates PKA-dependent phosphorylation of IP(3)R1 in response to BK-induced elevation of cAMP, and (2) it couples the plasmalemmal EGFR with IP(3)R1 at the Ca2+ store located juxtaposed to the plasma membrane. Our study illustrates how the junctional membrane IP3R complex connects different signaling pathways to define the fidelity and specificity of Ca2+ signaling.
URI
http://dspace.inha.ac.kr/handle/10505/1695
ISSN
0021-9525
Appears in Collections:
Medical School/College of Medicine (의학전문대학원/의과대학) > Medical Science (의학) > Journal Papers, Reports(의학 논문, 보고서)
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