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Angiotensin II potentiates DNA synthesis in AT-1 transformed cardiomyocytes.

Abstract：

:Angiotensin II has been shown to be mitogenic in various cell types. In cultured neonatal cardiomyocytes, we have demonstrated that angiotensin II causes hypertrophy, not hyperplasia. However, fetal or neonatal cardiomyocytes exhibit limited proliferation in primary culture, and are mitotically less potent. In order to determine whether angiotensin II is simply a hypertrophic or hyperplastic growth factor for mitotically-potent cardiomyocytes, we analysed [3H]-thymidine uptake and cell cycle-regulated gene expression using SV40 large T-transformed AT-1 cardiomyocytes. Angiotensin II, alone and in combination with other growth factors, increased [3H]-thymidine uptake in a dose-dependent manner. The mRNA expression of G1 cyclins (Cyclin C, D1, D2, D3) and histone H1-kinase activity by CDK2 increased 6 h after angiotensin II stimulation. Western blot analysis revealed cyclin B1 expression after 18 h , which peaked at 30 h. Histone H1-kinase activity by cdc2 was also increased by angiotensin II, and peaked at 24-36 h, indicating that these changes were cell cycle dependent. Double immunofluorescent photography showed that AT-1 cells incorporated BrdU, and expressed cdc2 by angiotensin II stimulation. [3H]-thymidine and BrdU uptake were blocked by losartan, but not by PD123319. In contrast with neonatal cardiomyocytes, angiotensin II potentiated DNA synthesis and induced cell cycle regulated gene expression in AT-1 cardiomyocytes, and this activity was mediated by the angiotensin II type-1 receptor.

journal_name

J Mol Cell Cardiol

journal_title

Journal of molecular and cellular cardiology

authors

Fukuda K,Izumo S

doi

10.1006/jmcc.1998.0770

subject

Has Abstract

pub_date

1998-10-01 00:00:00

pages

2069-80

issue

10

eissn

0022-2828

issn

1095-8584

pii

S0022-2828(98)90770-2

journal_volume

30

pub_type

杂志文章

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