نوع مقاله : مقاله پژوهشی Released under (CC BY-NC) license I Open Access I

نویسندگان

1 استاد دانشگاه تهران

2 دکتری فیزیولوژی ورزش دانشگاه تهران

3 دکتری فیزیولوژی ورزشی

چکیده

هدف: گیرنده ایکس آلفا در متابولیسم گلوکز نقش دارد. از طرف دیگر، انتقال گلوکز در کبد توسط انتقال دهنده شماره 2 گلوکز انجام می شود. بنابراین این پژوهش با هدف بررسی تغییرات بیان ژن های گیرنده ایکس آلفا، انتقال دهنده شماره 2 گلوکز کبدی و شاخص مقاومت به انسولین پس از 8 هفته تمرین هوازی در موش های صحرایی نر دیابتی نوع2 طراحی شد.
روش‌شناسی: هجده سر موش صحرایی نر 8 هفته ای (با میانگین و انحراف معیار وزنی 1/13±6/233 گرم) به عنوان نمونه پژوهش انتخاب شدند. موش ها با استفاده از داروی نیکوتین آمید و استرپتوزوتوسین دیابتی شدند. پنج روز پس از تزریق، تست دیابت با نوار قند خون انجام شد. موش های با سطح گلوکز 126-400میلی گرم/ دسی لیتر به عنوان نمونه انتخاب شدند. موش ها در دو گروه کنترل و تمرین قرار گرفتند. برنامه تمرینی 8 هفته ای شامل دویدن با سرعت 10-25 متر/دقیقه، شیب 5%، به مدت 15-40 دقیقه و 5 جلسه در هفته بود.
یافته‌ها: القای دیابت باعث افزایش وزن(001/0p=) موش ها شد. وزن عضله نعلی(001/0p=) و مقادیر هموگلوبین گلیکوزیله(000/0p=) در گروه تمرین بطور معنادار بیشتر و مقادیر گلوکز(0001/0p=)، انسولین(002/0p=) و شاخص مقاومت انسولینی(002/0p=) در گروه تمرین بطور معناداری کم تر بود. تفاوت معناداری در بیان ژن های انتقال دهنده گلوکز و گیرنده ایکس آلفا بین دو گروه پس از مداخله تمرینی مشاهده نشد.
نتیجه‌گیری: به نظر می رسد 8 هفته تمرین هوازی با شدت 60-80 درصد VO2max می تواند تغییرات متابولیکی مثبت در موش های دیابتی نوع2 ایجاد کند اما در بیان ژن های انتقال دهنده گلوکز و گیرنده ایکس آلفا کبدی تغییری ایجاد نمی کند.

کلیدواژه‌ها

عنوان مقاله [English]

Changes of LXR α, GLUT2 genes expression in liver and insulin resistance after aerobic training in type 2 diabetic rats

نویسندگان [English]

  • AA Gaeini 1
  • N Ramezani 2
  • L Shafiei Neek 3

1 Professor in Exercise Physiology, University of Tehran,

2 PhD in Exercise Physiology, University of Tehran

3 PhD in Exercise Physiology, University of Tehran

چکیده [English]

Aim: Background: The liver xα receptor (LXRα) participates in glucose metabolism. On the other hand, glucose transfer in liver by glucose transporter 2 (GLUT2). Therefore, this study was designed to examine the changes of LXRα, GLUT2 genes expression in liver and insulin resistance after 8 weeks of aerobic training in type 2 diabetic rats.
Method: Eighteen male 8-weeks-old Wistar rats were selected as research sample. Diabetes was induced by nicotinamide and streptozotocin. Five days after diabetes induction, fasting blood glucose was measured using blood glucose strips. Rats with fasting blood glucose between 126-400 mg were selected as diabetic. Rats were divided into two groups: control and training. The training program was running with the speed of 10–25 m/min for 15-40 min/day, 5% slope, 5 days a week for 8 weeks.
Results: Diabetes induction resulted in significant increase in body weight (p=0.001). Training group had higher muscle weight (p=0.001) and HbA1c (p=0.001) but lower glucose (p=0. 001), insulin (p=0.002) and insulin resistance index (p=0.002). LXRα and GLUT2 gene expressions were not different significantly.
Conclusion: It seems that 8 weeks aerobic training with 60-80% of vo2max can induce some positive metabolic changes in diabetic rats but did not induce any significant changes in LXRα and GLUT2 genes expression in liver tissue.

کلیدواژه‌ها [English]

  • : Diabetes
  • Aerobic training
  • Insulin
  • RT-PCR
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