Mechanical stretch-induced hypertrophy of neonatal rat ventricular myocytes is mediated by beta(1)-integrin-microtubule signaling pathways.

Abstract:

BACKGROUND:Mechanical stress plays a crucial role in tissue morphogenesis and remodeling. These processes depend in part on force transmission mediated through integrins and the cytoskeleton. METHODS:Ventricular myocytes isolated from neonatal Sprague-Dawley rats (NRVMs) were exposed to persistent centrifugal force stretch for 12 or 24 h. The NRVMs were exposed to colchicine (4 micromol/ml) and anti-integrin beta1 specific antibody (10 microg/ml). Cell viability was assessed by MTT assay and lactate dehydrogenase (LDH) activity. Incorporation of 3H-leucine, and atrial natriuretic peptide (ANP) and angiotensin II (Ang II) levels were assessed. Pixel intensity and distribution of the microtubule were estimated from laser scanning confocal images. RESULTS:Changes in LDH release and the MTT assay showed that 180 rpm. centrifugal force had minimal effect on the viability and number of NRVMs. Mechanical stretch significantly increased 3H-leucine incorporation into cardiomyocytes. Anti-integrin beta1 blocking antibody effectively inhibited the increase in 3H-leucine incorporation and release of ANP (p < 0.05). Following anti-integrin-beta1-blocking antibody, the pixel intensity of the microtubule image was decreased after both12 and 24 h stretch, this was similar to the effect of colchicine. Both treatments also inhibited the secretion of Ang II induced by stretch (p < 0.05). CONCLUSIONS:Anti-integrin-beta1-blocking antibody and colchicine had similar effects, partly inhibiting the stretch-induced increase in microtubule polymerization and the secretion of Ang II in hypertrophic cardiac myocytes.

journal_name

Eur J Heart Fail

authors

Yutao X,Geru W,Xiaojun B,Tao G,Aiqun M

doi

10.1016/j.ejheart.2005.05.014

keywords:

subject

Has Abstract

pub_date

2006-01-01 00:00:00

pages

16-22

issue

1

eissn

1388-9842

issn

1879-0844

pii

S1388-9842(05)00154-6

journal_volume

8

pub_type

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