Lab Anim Res.  2012 Mar;28(1):1-9.

Differential expression of caveolins and myosin heavy chains in response to forced exercise in rats

• Park S
• Hong Y
• Lee Y
• Won J
• Chang KT
• Hong Y

Abstract

Exercise training can improve strength and lead to adaptations in the skeletal muscle and nervous systems. Skeletal muscles can develop into two types: fast and slow, depending on the expression pattern of myosin heavy chain (MHC) isoforms. Previous studies reported that exercise altered the distribution of muscle fiber types. It is not currently known what changes in the expression of caveolins and types of muscle fiber occur in response to the intensity of exercise. This study determined the changes in expression of caveolins and MHC type after forced exercise in muscular and non-muscular tissues in rats. A control (Con) group to which forced exercise was not applied and an exercise (Ex) group to which forced exercise was applied. Forced exercise, using a treadmill, was introduced at a speed of 25 m/min for 30 min, 3 times/day (07:00, 15:00, 23:00). Homogenized tissues were applied to extract of total RNA for further gene analysis. The expression of caveolin-3 and MHC2a in the gastrocnemius muscle of female rats significantly increased in the Ex group compared with the Con group (P<0.05). Furthermore, in the gastrocnemius muscle of male rats, the expression of MHC2x was significantly different between the two groups (P<0.05). There was an increased expression in caveolin-3 and a slightly decreased expression in TGFbeta-1 in muscular tissues implicating caveolin-3 influences the expression of MHC isoforms and TGFbeta-1 expression. Eventually, it implicates that caveolin-3 has positive regulatory function in muscle atrophy induced by neural dysfunction with spinal cord injury or stroke.

Keyword

Forced exercise; caveolins; myosin heavy chain; TGFbeta-1

MeSH Terms

Animals
Caveolin 3
Caveolins
Female
Humans
Male
Muscle, Skeletal
Muscles
Muscular Atrophy
Myosin Heavy Chains
Myosins
Nervous System
Protein Isoforms
Rats
RNA
Spinal Cord Injuries
Stroke
Caveolin 3
Caveolins
Myosin Heavy Chains
Myosins
Protein Isoforms
RNA

Figure

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  Figure 1 Expression of caveolin-1, -2, and -3 in the brain of female rats. (A) fore-brain, (B) mid-brain, and (C) hind-brain. Con: non-treadmill exercised group, Ex: treadmill exercised group.

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  Figure 2 Expression of caveolin-1, -2, and -3 in the heart and kidney of female rats. (A) heart, (B) kidney. Con: non-treadmill exercised group, Ex: treadmill exercised group.

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  Figure 3 Expression of caveolin-1, -2, and -3 in the gastrocnemius muscle of male and female rats. (A) male, (B) female. Con: non-treadmill exercised group, Ex: treadmill exercised group.

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  Figure 4 Expression of caveolin-1, -2, and -3 in the soleus muscle of male and female rats. (A) male, (B) female. Con: non-treadmill exercised group, Ex: treadmill exercised group.

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  Figure 5 The expression of MHC-1β, MHC-2a, -2x, and -2b, and TGFβ-1 in the gastrocnemius muscle of male and female rats. (A) male, (B) female. Con: non-treadmill exercised group, Ex: treadmill exercised group.

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  Figure 6 The expression of MHC-1β, MHC-2a, -2x, and -2b, and TGFβ-1 in the soleus muscle of male and female rats. (A) male, (B) female. Con: non-treadmill exercised group, Ex: treadmill exercised group.

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