Muscles of mice deficient in alpha-sarcoglycan maintain large masses and near control force values throughout the life span.

Abstract:

:alpha-Sarcoglycan-deficient (Sgca-null) mice provide potential for elucidating the pathogenesis of limb girdle muscular dystrophy type 2D (LGMD 2D) as well as for studying the effectiveness of therapeutic strategies. Skeletal muscles of Sgca-null mice demonstrate an early onset of extensive fiber necrosis, degeneration, and regeneration, but the progression of the pathology and the effects on muscle structure and function throughout the life span are not known. Thus the phenotypic accuracy of the Sgca-null mouse as a model of LGMD 2D has not been fully established. To investigate skeletal muscle structure and function in the absence of alpha-sarcoglycan throughout the life span, we analyzed extensor digitorum longus and soleus muscles of male and female Sgca-null and wild-type mice at 3, 6, 12, and 18 mo of age. Maximum isometric forces and powers were measured in vitro at 25 degrees C. Also determined were individual myofiber cross-sectional areas and numbers, water content, and the proportion of the cross section occupied by connective tissue. Muscle masses were 40-100% larger for Sgca-null compared with age- and gender-matched wild-type mice, with the majority of the increased muscle mass for Sgca-null mice attributable to greater connective tissue and water contents. Although the greater mass of muscles in Sgca-null mice was primarily noncontractile material, absolute forces and powers were maintained near control levels at all ages, indicating a successful adaptation to the deficiency in alpha-sarcoglycan not observed at any age in LGMD 2D patients.

journal_name

Physiol Genomics

journal_title

Physiological genomics

authors

Consolino CM,Duclos F,Lee J,Williamson RA,Campbell KP,Brooks SV

doi

10.1152/physiolgenomics.00311.2004

subject

Has Abstract

pub_date

2005-07-14 00:00:00

pages

244-56

issue

2

eissn

1094-8341

issn

1531-2267

pii

00311.2004

journal_volume

22

pub_type

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