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Suppression of Npr1, not Npr2 gene function induces hypertrophic growth in H9c2 cells in vitro.

Abstract：

:Npr1 gene (coding for NPR-A) and Npr2 gene (coding for NPR-B) are identified as intrinsic anti-hypertrophic genes that opposes abnormal cardiac remodeling. However, the functional role of Npr1 and Npr2 genes during cardiac hypertrophic growth is not well understood. Hence, the present investigation was aimed to study the effect of Npr1 and Npr2 gene silencing, respectively on β-AR activation induced cardiac hypertrophic growth in H9c2 cells in vitro. The control, Npr1, and Npr2 gene suppressed H9c2 cells, respectively were treated with ISO (10-5 M) for 48 h. The mRNA and protein expression profile of NPR-A, NPR-B, PKG-I and cGMP were analyzed by qPCR, Western blotting, ELISA, and immunofluorescence methods, respectively. A marked increase in cell size (30.10 ± 0.51 μm vs 61.83 ± 0.43 μm, 2-fold) accompanied by elevated hypertrophic marker genes (α-sk and β-MHC 3-fold, respectively) expression was observed in Npr1 gene suppressed H9c2 cells as compared with control cells. In contrast, the Npr2 gene suppression in H9c2 cells neither altered the cell size nor the level of hypertrophic marker genes expression. Upon exposure to Isoproterenol, the Npr1 suppressed H9c2 cells exhibited further increase in cell size (1.5 fold), whereas, no significant increase in cell size or marker genes expression was noticed in Npr2 suppressed cells. Moreover, the intracellular cGMP level was down-regulated by 2-fold in Npr1 suppressed cells, while, no significant change was observed in Npr2 suppressed cells. Together, these results suggest that Npr1, not Npr2 gene function is positively associated with the initiation of cardiac fetal gene program and development of cardiac hypertrophic growth.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Manivasagam S,Vellaichamy E

doi

10.1016/j.bbrc.2017.07.123

subject

Has Abstract

pub_date

2017-09-16 00:00:00

pages

250-256

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(17)31481-X

journal_volume

491

pub_type

杂志文章

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