جستجوی مقالات مرتبط با کلیدواژه "mafbx" در نشریات گروه "پزشکی"

Reduction of muscle mass occurs in some models of muscle atrophy during mechanical unloading status and MST1 and MAFbx genes are believed to have a role. In the present study, the effect of reduced physical activity in the form of spinal nerve ligation (SNL) after a period of endurance training (ET) on the expression of MST1 and MAFbx genes were examined in the rat plantaris muscle.

In this experimental study, 16 rats were randomly divided into two groups: control-spinal nerve ligation (Sham+SNL) and endurance training-spinal nerve ligation (ET+SNL). Training program continued for six weeks, four sessions a week with moderate intensity (70-60% of VO2max). To create the SNL model, the rats were first anesthetized with pentobarbitol sodium and then their fifth lumbar spinal nerve was tightly tied. The duration of the SNL protocol was four weeks. After the last day of ligation, the plantaris muscle was extracted. Real-Time PCR was used to measure the mRNA expression of the MST1 and MAFbx.

The expression of MST1 gene showed no significant increase in ET+SNL group compared with Sham+SNL group (P>0.05). But, significant increase was seen in MAFbx gene expression in ET+SNL group compared with Sham+SNL group (P<0.05).

The study showed that reduced activity in the form of SNL after endurance training can lead to destructive effects on the muscular system and symptoms of muscle atrophy could be seen.

Protein synthesis and degradation are dynamically regulated processes that to control the accretion or loss of muscle mass. However, the mechanisms responsible exercise-induced heart hypertrophy remains elusive. The aim of this study was to investigate the effect of aerobic training on expression of some indices of myocardial hypertrophy and atrophy in male rats.

In this experimental study, 16 Wistar male rats 10 weeks old with 299.74±19.32 g weight were randomly classified into control and training groups. Training group have performed an aerobic running program (at 10-18 m/min, 10-40 min/day, and 5 days/week) on a motor-driven treadmill for six weeks. At the end of six weeks heart tissue samples were collected and used for determination of gene expression (AMPK, FOXO3, MAFbx and MuRF1). Data were analyzed using Independent t test at p<0.05.

 Six weeks aerobic training significant increases heart AMPK in rats (p=0.014). Also heart FOXO3 (p=0.022), MAFbx (p=0.032) and MuRF1 (p=0.028) was significantly decrease than training group.

Aerobic exercise improves heart structure by improving the parameters that affect cardiac size, possibly improving cardiac function.

Diabetes is a metabolic disease that is associated with heart injury. It has been shown that exercise training and resveratrol can improve the cardiac structure and function of diabetic subjects. The aim of the present study was to examine the effect of aerobic training along with resveratrol on gene expression of AMPK and MAFbx on cardiac tissue of diabetic experimental model.

In this experimental study, 40 males Wistar rats were randomly were divided into 5 groups: control (CN), diabetes (DM), diabetes-Resveratrol (RDM), diabetes-aerobic exercise (TDM), diabetes-aerobic exercise-Resveratrol (RTDM).Training groups have performed a running program on the treadmill for 8 weeks. Resveratrol (20 mg/kg) was injected subcutaneously 8 weeks for RDM and TRDM groups. 48 hours after the last training session, rats were anesthetized. Changes in the expression of AMPK and MAFbx myocardial genes were quantified using real-time PCR methods.

The results of the present study showed a reduction in AMPK expression (P < 0.001) and an increase in MAFbx (P < 0.001) in cardiomyocytes in DM groups compared to CN group.
AMPK expression was significantly increased in TRDM group compared to DM (p=0.009), RDM (p=0.011) and TDM (p=0.043) groups. MAFbx expression of cardiomyocytes in RDM (p=0.012), TDM (p<0.001) and TRDM (p<0.001) groups had significantly reduction compared to DM group. Also, MAFbx expression was significantly reduction in TRDM groups compared to RDM (p=0.041) groups.

 Long-term aerobic exercise, with and without resveratrol consumption it may cause to reduce the genomic indicators of atrophy and increase myocardial hypertrophy in diabetic rats.