Phospholipase C activation and Ca2+ mobilization by cloned human somatostatin receptor subtypes 1-5, in transfected COS-7 cells.

Abstract:

:We transfected the COS-7 cells with cDNAs encoding different human somatostatin receptor (hSSTR) subtypes, and found that hSSTR subtypes mediate not only the inhibition of forskolin-induced cAMP accumulation but also the stimulation of phospholipase C (PLC) and Ca2+ mobilization. Activation of PLC by 1 microM somatostatin (SRIF) was in the order of: hSSTR5 > hSSTR2 > hSSTR3 > hSSTR4 > hSSTR1. Pertussis toxin (PTX) treatment completely or partially reversed the PLC activation. 1 nM SRIF was equally effective for adenylate cyclase (AC) inhibition in a PTX-sensitive manner, in all the cells expressing different hSSTRs, except for hSSTR1. Nevertheless, SRIF stimulated AC even in the presence of forskolin at higher doses of SRIF in PTX-treated hSSTR5-expressing cells. We conclude that the cloned hSSTRs differentially couple to PTX-sensitive and -insensitive G-proteins to modulate PLC, Ca2+ mobilization and AC.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Akbar M,Okajima F,Tomura H,Majid MA,Yamada Y,Seino S,Kondo Y

doi

10.1016/0014-5793(94)00603-2

subject

Has Abstract

pub_date

1994-07-11 00:00:00

pages

192-6

issue

2

eissn

0014-5793

issn

1873-3468

pii

0014-5793(94)00603-2

journal_volume

348

pub_type

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