Acid Phosphatase and Protease Activities in Immobilized Rat Skeletal Muscles

Document Type

Article

Language

eng

Format of Original

5 p.

Publication Date

12-1982

Publisher

NRC Research Press

Source Publication

Canadian Journal of Physiology and Pharmacology

Source ISSN

0008-4212

Abstract

The effect of hind-limb immobilization on selected lysosomal enzyme activities was studied in rat hind-limb muscles composed primarily of type I, IIA, or IIB fibers. Following immobilization, acid protease and acid phosphatase both exhibited significant (P < 0.05) increases in their activity per unit weight in all three fiber types. Acid phosphatase activity increased at day 14 of immobilization in the three muscles and returned to control levels by day 21. Acid protease activity also changed biphasically, displaying a higher and earlier rise than acid phosphatase. The pattern of change in acid protease, but not acid phosphatase, closely parallels observed muscle wasting. The present data therefore demonstrate enhanced proteolytic capacity of all three fiber types early during muscular atrophy. In addition, the data suggest a dependence of basal hydrolytic and proteolytic activities and their adaptive response to immobilization on muscle fiber composition.

Comments

Canadian Journal of Physiology and Pharmacology, Vol. 60, No. 12 (December 1982): 1732-1736. DOI.

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