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Stimulation of catecholamine biosynthesis via the protein kinase C pathway by endothelin-1 in PC12 rat pheochromocytoma cells.

Abstract：

:It has been reported that endothelins (ETs) stimulate catecholamine release from chromaffin cells. However, it is not known whether ETs also affect catecholamine biosynthesis. Thus, using a rat pheochromocytoma cell line, PC12, we examined the effects of ETs on catecholamine biosynthesis. The mRNA level and activity of tyrosine hydroxylase (TH), a rate-limiting enzyme in catecholamine biosynthesis, were increased significantly by endothelin-1 (ET-1) (100nM). These stimulatory effects were inhibited completely by a blocker for the A-type endothelin receptor, BQ-123 [cyclo(D-alpha-aspartyl-L-prolyl-D-valyl-L-leucyl-D-tryptophyl)] (1 microM), but not by a blocker for the B-type endothelin receptor, BQ-788 (N-cis 2,6-dimethylpiperidinocarbonyl-L-gamma-methylleucyl-D-1-methoxycarbonyltryptophanyl-D-norleucine (1 microM). Also, Ro-32-0432 (3-[8-[(dimethylamino)methyl]-6,7,8,9-tetrahydropyrido-[1,2-a]indol-10-yl]-4-(1-methyl-3-indolyl)-H-pyrrole-2,5-dione hydrochloride) (100nM), a protein kinase C inhibitor, completely inhibited ET-1-induced increases in TH activity and mRNA level. Furthermore, ET-1 (100nM) significantly stimulated protein kinase C activity, as well as inositol 1,4,5-triphosphate production; these stimulatory effects were abolished by BQ-123 but not by BQ-788. Moreover, ET-1 (100nM) significantly increased both the TH-protein level and the intracellular catecholamine content. By contrast to ET-1, endothelin-3 did not affect catecholamine synthesis. These results indicate that ET-1, but not ET-3, stimulates catecholamine synthesis through the PKC pathway in PC12 cells. Also, the use of selective ET receptor antagonists suggests that the effects of ET-1 on catecholamine biosynthesis are mediated through ET(A).

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Takekoshi K,Ishii K,Shibuya S,Kawakami Y,Isobe K,Nakai T

doi

10.1016/s0006-2952(01)00862-0

subject

Has Abstract

pub_date

2002-03-01 00:00:00

pages

977-84

issue

5

eissn

0006-2952

issn

1873-2968

pii

S0006295201008620

journal_volume

63

pub_type

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