Angiotensin II induced cardiac hypertrophy is blocked by PTEN via suppressing Ca2+/Calcineurin pathway.
- Author:
Lin-jun YU
1
;
Shan-jun ZHU
;
Yi-zhong ZHOU
;
Jiang WANG
;
Ying TIAN
;
Zhi-ming ZHU
Author Information
- Publication Type:Journal Article
- MeSH: Adenoviridae; genetics; Angiotensin II; metabolism; Animals; Calcineurin; metabolism; Calcium; metabolism; Cardiomegaly; metabolism; Cells, Cultured; DNA, Complementary; Myocytes, Cardiac; metabolism; PTEN Phosphohydrolase; genetics; metabolism; RNA, Messenger; metabolism; Rats; Rats, Wistar; Signal Transduction
- From: Chinese Journal of Cardiology 2006;34(6):541-545
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo investigate the effects of PTEN on Ang II induced cardiomyocyte hypertrophy and subsequent Ca(2+)/Calcineurin pathway changes.
METHODSPrimary cultured neonatal rat cardiomyocytes were cultured and were treated with phosphate-buffered saline, empty adenovirus (Ad-GFP), or adenovirus encoding for PTEN (Ad-PTEN-GFP) for 48 h and Ang II (10(-7) mol/L) was added to the medium for another 24 h. Cells were harvested and intracellular Ca(2+) concentration ([Ca(2+)] i) was determined by Fura-2/AM ratio imaging analysis; PTEN, ANF, beta-MHC and CaNAbeta mRNA evaluated with RT-PCR; PTEN and CaNAbeta protein by Western blot; CaN phosphatase activity by CaN detecting kits.
RESULTSPTEN at mRNA and protein levels were significantly higher in Ad-PTEN-GFP treated cardiomyocytes than that of Ad-GFP treated cardiomyocytes. Ang II stimulation upregulated [Ca(2+)] i, CaNAbeta at mRNA and protein levels and CaN phosphatase activity in Ad-GFP treated cardiomyocytes but not in Ad-PTEN-GFP treated cardiomyocytes.
CONCLUSIONSCardiac hypertrophy induced by Ang II could be blocked by PTEN overexpression via suppressing Ca(2+)/Calcineurin pathway.
