NDLI: The Involvement of Ser1898 of the Human L-Type Calcium Channel in Evoked Secretion

Content Provider	PubMed Central
Author	Niv, Bachnoff Moshe, Cohen-kutner Atlas, Daphne
Copyright Year	2011
Abstract	A PKA consensus phosphorylation site S1928 at the α 11.2 subunit of the rabbit cardiac L-type channel, CaV1.2, is involved in the regulation of CaV1.2 kinetics and affects catecholamine secretion. This mutation does not alter basal CaV1.2 current properties or regulation of CaV1.2 current by PKA and the beta-adrenergic receptor, but abolishes CaV1.2 phosphorylation by PKA. Here, we test the contribution of the corresponding PKA phosphorylation site of the human α 11.2 subunit S1898, to the regulation of catecholamine secretion in bovine chromaffin cells. Chromaffin cells were infected with a Semliki-Forest viral vector containing either the human wt or a mutated S1898A α 11.2 subunit. Both subunits harbor a T1036Y mutation conferring nifedipine insensitivity. Secretion evoked by depolarization in the presence of nifedipine was monitored by amperometry. Depolarization-triggered secretion in cells infected with either the wt α 11.2 or α 11.2/S1898A mutated subunit was elevated to a similar extent by forskolin. Forskolin, known to directly activate adenylyl-cyclase, increased the rate of secretion in a manner that is largely independent of the presence of S1898. Our results are consistent with the involvement of additional PKA regulatory site(s) at the C-tail of α 11.2, the pore forming subunit of CaV1.2.
Related Links	http://dx.doi.org/10.1155/2011/746482
Starting Page	746482
File Format	PDF
ISSN	16878337
e-ISSN	16878345
Journal	International Journal of Endocrinology
Volume Number	2011
Language	English
Publisher	Hindawi Publishing Corporation
Publisher Date	2011-01-01
Access Restriction	Open
Rights Holder	Hindawi Publishing Corporation
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Endocrine and Autonomic Systems Endocrinology, Diabetes and Metabolism Endocrinology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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