Mechanical properties of smooth muscle portal vein in normal and dystrophin-deficient (mdx) mice.

Abstract:

:Mechanical properties of the vascular smooth muscle from normal and dystrophin-deficient (mdx) mice were examined. Changes in resting and developed tensions in response to stretch were recorded in isolated portal vein. The vascular segments were elongated in 5 % increments of the 'in situ' length (Lr) up to 1.30Lr. The resting length-tension curves in male mdxmice were similar to normal mice, while a marked decrease in the slope of the curve was noted in female mdx mice. These findings were not affected by atropine, phentolamine, tetrodotoxin or [Ca2+] in the surrounding media. At Lr, the tension of isolated portal vein was characterized by spontaneous synchronized uniform force waves in normal mouse. In contrast, in mdxmouse portal veins an irregular motor pattern characterized by desynchronized force waves with a decrease of amplitude and an increase in frequency was recorded. Extension of the length of the portal vein segment did not increase the spontaneous phasic activity developed in female mdx mice although this was noted with male mdx mice and normal mice. Experiments with chemical depolarizing agents indicated that spontaneous myogenic excitation activated the great majority of vascular smooth muscle cells in normal mouse portal vein, whereas in mdx mice only a reduced number of these cells were excited suggesting that in the mdx mouse the intercellular electronic coupling is altered. In conclusion this study provides the first description of the mechanical activities of portal vein longitudinal muscle and shows that in mdx mice the motor activity is severely disrupted.

journal_name

Exp Physiol

journal_title

Experimental physiology

authors

Mancinelli R,Tonali P,Romani R,Tringali A,Vargiu R,AZZENA GB

subject

Has Abstract

pub_date

1999-09-01 00:00:00

pages

929-40

issue

5

eissn

0958-0670

issn

1469-445X

pii

PHY_1870

journal_volume

84

pub_type

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