بررسی اثرات متفورمین بر سطح آیریزین و پارامترهای بیوشیمیایی سرم در رت‌های نر نژاد اسپراگ – داولی با رژیم غذایی امولسیون پرچرب

نویسندگان

1 گروه زیست‌‌‌شناسی، دانشکده علوم پایه، دانشگاه آزاد اسلامی واحد علوم و تحقیقات، تهران، ایران

2 مرکز تحقیقات اندوکرینولوژی و متابولیسم، دانشگاه علوم پزشکی تهران، ایران

چکیده
آیریزین یک مایوکاین است که بیشتر از عضلات پس از فعالیت‌های ورزشی ترشح ‌می‌شود و در اختلالات متابولیک میزان ترشح آن تغییر ‌می‌کند. هدف از این تحقیق، بررسی تاثیر متفورمین بر تغییرات سطح آیریزین پلاسما، تغییرات گلوکز خون و مقاومت به انسولین در رت‌های نر نژاد اسپراگ - داولی بود که رژیم امولسیون پرچرب حاوی روغن ذرت دریافت ‌می‌کردند. بیست و چهار سر رت نر، نژاد اسپراگ داولی به دو گروه کنترل نرمال (n=8) و رژیم پرچرب (n=16) تقسیم و سپس گروه رژیم پر چرب به دو زیر گروه شامل گروه کنترل رژیم پرچرب (n=8) و گروه متفورمین (n=8) تقسیم شدند. گروه کنترل نرمال رژیم استاندارد دریافت نمود. گروه کنترل رژیم پر چرب، رژیم امولسیون پرچرب حاوی روغن ذرت به صورت گاواژ روزانه و به مدت شش هفته و گروه متفورمین، رژیم امولسیون پرچرب همراه با متفورمین (به میزان 250 میلی‌گرم بر کیلوگرم روزانه) دریافت نمود. در پایان شش هفته میزان گلوکز، انسولین، آیریزین، آدیپونکتین، مقاومت به انسولین HOMA-IR، آنزیم‌های کبدی، فاکتور نکروز تومور آلفا (TNF-α)، پروفایل چربی در سرم، پروفایل چربی و پراکسیداسیون لیپیدی در کبد، همچنین میزان بیان ژن PGC-1α با روش Real-time PCR در بافت چربی مورد بررسی قرار گرفت. آزمایشات بافت‌‌‌شناسی کبد شامل رنگ آمیزی هماتوکسیلین ائوزین به منظور بررسی تجمع چربی در بافت کبد انجام گردید. میزان گلوکز خون، مقاومت به انسولین، آدیپونکتین، سطح آیریزین سرم همچنین پروفایل چربی سرم و کبد در گروه دریافت کننده رژیم پرچرب نسبت به گروه کنترل نرمال از نظر آماری بطورمعنی‌دار افزایش یافت (P<0/05). تیمار با متفورمین باعث کاهش معنی‌دار در سطح این پارامترها نسبت به گروه رژیم پرچرب گردید (P<0/05) بعلاوه افزایش در میزان بیان ژن PGC-1α در بافت چربی در این گروه مشاهده شد. با افزایش میزان مقاومت به انسولین در رت‌های دریافت کننده رژیم پرچرب، سطح آیریزین سرم نیز افزایش یافت و با کاهش گلوکز و بهبود مقاومت به انسولین توسط متفورمین، سطح آیریزین نیز کاهش پیدا کرد. این نتایج پیشنهاد ‌می‌کند که ممکن است افزایش سطح آیریزین، یک پاسخ جبرانی در برابر مقاومت به انسولین و اختلال در سوخت و ساز گلوکز باشد. بر این اساس شاید بتوان آیریزین را به عنوان هدفی برای درمان دیابت نوع دو مورد بررسی قرار داد.

کلیدواژه‌ها


عنوان مقاله English

Evaluating the effects of metformin on irisin and serum biochemical parameters in male sprague-dawley rats fed by a high-fat emulsion diet

نویسندگان English

Babak Hassan Khan 1
Parichehreh Yaghmaei 1
Kazem Parivar 1
Azadeh Ebrahim Habibi 2
1 Department of Biology, Faculty of Basic Sciences, Research Sciences Branch, Islamic Azad University, Tehran, Iran
2 Endocrinology and Metabolism Research Center, Tehran University of Medical Sciences Tehran, Iran
چکیده English

Irisin is a myokine secreted mostly by muscles after exercise, and its secretion level changes in metabolic disorders. The aim of present study was to investigate the effect of metformin on changes in the levels of plasma irisin, blood glucose and insulin resistance in male Sprague-Dawley rats receiving a high-fat emulsion diet. Twenty-four rats were divided into a normal control group (n = 8) and a high-fat diet group (n = 16). Then, high-fat diet group was divided into two subgroups, including high-fat diet control group (n = 8) and metformin group (n = 8). The normal control group received a standard diet. The high-fat diet control group received a high-fat emulsion diet containing corn oil by gavage on a daily basis for six weeks, and the metformin group received a high-fat emulsion diet with metformin (250 mg/kg/daily). At the end of the six-week period, factors such as glucose, insulin, irisin, Adiponectin, insulin resistance, liver enzymes, tumor necrosis factor α (TNF-α), serum lipid profile, lipid profile and lipid peroxidation in liver were measured and PGC-1α gene expression were examined in adipose tissue by Real-time PCR method. Liver histological tests with hematoxylin-eosin staining were performed to evaluate fat accumulation in liver tissue. Blood glucose level, insulin resistance, adiponectin, serum irisin level and liver lipid profile in the group receiving high-fat diet compared to the normal control group increased significantly (P <0. 05). Treatment with metformin caused a significant decrease in the level of these parameters compared to the high-fat diet group (P <0. 05) and an increase in the expression of PGC-1α gene in adipose tissue was observed in this group. As insulin resistance increased in rats receiving the high-fat diet, serum irisin level also increased, and with improving blood glucose and insulin resistance by metformin, serum irisin level was decreased. These results suggested that the elevated irisin levels may be a compensatory response to insulin resistance and impaired glucose metabolism. Hence, irisin could be considered as a potential target for the treatment of type 2 diabetes.





کلیدواژه‌ها English

Adiponectin
Exercise
glucose
Insulin resistance
myokine
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  • تاریخ دریافت 18 خرداد 1405
  • تاریخ انتشار 18 خرداد 1405