Journal List > Korean J Sports Med > v.29(2) > 1054458

Oh: Effect of Resistance Exercise Training on Mustn1 mRNA Expression in Rat Skeletal Muscle


The aim of this investigation was to determine if resistance exercise improved musculoskeletal embryonic nuclear protein 1 (Mustn1) mRNA expression in skeletal muscle of rat. Thirty-two male Sprague-Dawley rats were separated into sedentary (control group, CON; n=16) and exercise-trained groups (resistance exercise group, REG; n=16). CON and REG subsequently were separated into 4 weeks group (4 weeks CON, 4 weeks REG) and 8 weeks group (8 weeks CON, 8 weeks REG). The rats in the resistance exercise group were trained to climb a 1-m vertical (85 degree incline) ladder with weights secured to their tail, and they climbed the ladder 10 times 3 days per week for 8 weeks progressively. After weeks of exercise, skeletal muscle was taken from the flexor halucis longus. After separating the total ribonucleic acid (RNA) of each group, quantitative polymerase chain reaction was used to analyze RNA quantitatively. After 4 weeks of resistance exercise, Mustn1 mRNA expression increased significantly in REG compared to CON (p<0.001). Additionally, there was a significant increase of Mustn1 mRNA expression in 8 weeks REG compared to 8 weeks CON (p<0.01). Interestingly, there was a significant difference in Mustn1 mRNA between 4 weeks REG and 8 weeks REG (p<0.01). In the REG, Mustn1 mRNA increased by 3.7-fold and 2.1-fold relative to CON, respectively. In conclusion, the resistance training increased Mustn1 mRNA expression in skeletal muscle of rat. This shows that the Mustn1 mRNA expression gives positive effect on myogenesis and muscle regeneration in skeletal muscle of rat results from resistance ladder exercise.


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Fig. 1.
Changes of the body weight. ∗∗Significant differ-ence between control group (CON) and resistance ex-ercise group (REG). Significant at ∗∗p<0.01.
Fig. 2.
Absolute flexor halucis longus (FHL) weight. ∗Sig-nificant difference between control group (CON) and re-sistance exercise group (REG). Significant at ∗p<0.05.
Fig. 3.
Relative flexor halucis longus (FHL) weight. ∗∗Sig-nificant difference between control groups (CON) and re-sistance exercise groups (REG). Significant at ∗∗p<0.01.
Fig. 4.
Musculoskeletal embryonic nuclear protein 1 (Mustn1) messenger ribonucleic acid (mRNA) expression. GAPDH: glyceraldehyde-3-phosphate dehydrogenase.∗∗Significant difference between control group (CON) and resistance exercise group (REG). ##Significant difference between 4 weeks REG and 8 weeks REG. Significant at ∗∗p<0.01, ##p<0.01.
Fig. 5.
Musculoskeletal embryonic nuclear protein 1 (Mustn1) mRNA expression in contrasts with 4 weeks control groups (CON) and 8 weeks CON.
Table 1.
Resistance exercise program
Condition Reps Set Load Rest (min) Duration (min) Frequency (day/wk) Period (wk)
Adaptation period Max. 3 1 Weight bearing 1 10 4 1
Exercise period Max. 10 1 50%/body weight, every trial+15% 2 30 3 8
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