Mohammad Fathi; Reza Gharakhanlou; Masoud Soleimani; Hamid Rajabi
Volume 21, Issue 4 , 2019, Pages 1-8
Abstract
Background: The response of microRNA (miR-1), upstream regulators (Myogenic Differentiation 1 (MyoD1) and Myocyte Enhancer Factor 2C (Mef2C)), and a downstream target (Histone Deacetylase 4 (Hdac4)) to an acute bout of Resistance Exercise (RE) in Extensor Digitorum Longus (EDL) and soleus muscles has ...
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Background: The response of microRNA (miR-1), upstream regulators (Myogenic Differentiation 1 (MyoD1) and Myocyte Enhancer Factor 2C (Mef2C)), and a downstream target (Histone Deacetylase 4 (Hdac4)) to an acute bout of Resistance Exercise (RE) in Extensor Digitorum Longus (EDL) and soleus muscles has remained elusive.Objectives: In this experimental study, we investigated the effect of an acute bout of RE on the expression of miR-1, MyoD1, Mef2C, and Hdac4 genes in the slow and fast-twitch muscle of rats.Methods: The current study was conducted at Tarbiat Modares University, Tehran, Iran, in 2017. Fifteen male Wistar rats were ran- domly divided into two groups, control (n = 5) and RE (n = 10). The RE protocol consisted of four sets of five repetitions of climbing a ladder with weights attached to the tails of rats. The soleus and EDL muscles of rats were collected at 3 h (n = 5) and 6 h (n = 5) post-RE. The real-time polymerase chain reaction was used to measure the levels of miR-1, MyoD1, Mef2C, and Hdac4 mRNA expression.Results: The miR-1 expression in EDL muscle was significantly lower at 3 h and 6 h post-exercise in the RE group than in the control group (P < 0.01). The miR-1 expression in soleus muscle was significantly lower at 3 h post-exercise in the RE group than in the control group (P < 0.007) but it was significantly higher at 6 h post-exercise (P < 0.036). The expression of MyoD1, Mef2C, and Hdac4 genes in the EDL muscle was higher in the RE group than in the control group (P < 0.01). The expression of these genes in response to RE had more fluctuations in soleus muscle.Conclusions: It can be concluded that miR-1 expression in extensor digitorum longus and soleus muscles of rats responds to resis- tance exercise in different manners and this coincides with a change in upstream regulators and downstream target.
Somayeh Mohammadi; Mehrangiz Ebrahimi-Mameghani; Seyed Rafie Arefhosseini; Parviz Fallah; Mohammad Asghari Jafarabadi; Sepideh Zununi; Masoud Soleimani; Mehdi Banitalebi Dehkordi; Hossein Ghanbarian
Volume 19, Issue 1 , January 2017, , Pages 1-10
Abstract
Background: MicroRNAs have recently been introduced as epigenetic regulators of glucose and lipid metabolic pathways, which are impaired in obesity and diabetes.Objectives: We evaluated the effects of calorie-restricted diet therapy on the circulating levels of miR-33b and miR-29a in relationship to ...
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Background: MicroRNAs have recently been introduced as epigenetic regulators of glucose and lipid metabolic pathways, which are impaired in obesity and diabetes.Objectives: We evaluated the effects of calorie-restricted diet therapy on the circulating levels of miR-33b and miR-29a in relationship to glucose and lipid metabolic parameters in obese patients with type 2 diabetes mellitus (T2DM).Methods: This randomized clinical controlled trial was performed on 30 eligible obese women with T2DM, randomly divided into two groups (control group, n = 15; diet therapy group, n = 15) for 10 weeks. Ten healthy women with normal weight were enrolled at the baseline of the study as controls. Demographic information, dietary intake, and anthropometric and biochemical indices were obtained before and after the study. Circulating miR-33b and miR-29a were assessed for all subjects using quantitative RT-PCR, and the fold change of each circulating miRNA was compared between groups.Results: The circulating levels of miR-29a and miR-33b in the diabetic women were higher (0.40-fold) and lower (1.43-fold), respectively, than normal levels. Diet therapy significantly increased the circulating level of miR-33b (P = 0.023, 0.97-fold upregulation) to normal levels. This increase was independently correlated with caloric restriction (95%CI: -0.004 to -0.0001, P = 0.022) and 2hPPBS (95%CI: -0.009 to -0.001, P = 0.035). No remarkable change was observed in circulating levels of miR-29a.Conclusions: Our findings introduced a novel therapeutic effect of diet therapy on circulating miRNAs in obese patients with T2DM. MiR-33b is an important therapeutic target in the treatment and prevention of T2DM and its complications.