تأثیر یک دوره تمرین استقامتی هوازی پیش از القای ایزوپروترنول بر بیان ژن‌های NF-κB و NFATدر بافت بطن چپ موش‌های صحرایی نر نژاد ویستار

نوع مقاله : علمی - پژوهشی

نویسندگان

دانشکدۀ تربیت بدنی و علوم ورزشی، دانشگاه تهران، تهران، ایران

چکیده

زمینه و هدف: هایپرتروفی بیماری‌زای قلبی نوعی اختلال قلبی است که با تغییر ساختار قلب، آپوپتوز و فیبروز سلول‌های عضلۀ قلب همراه است که به کاهش توانایی تلمبه‌زنی قلب و در نهایت احتمالاً به ایجاد نارسایی قلبی و مرگ ناگهانی منجر می‌شود. نشان داده شده است که مسیر پیام‌رسانی عوامل رونویسی NF-κB و NFAT نقش مهمی در فرایند هایپرتروفی بیماری‌زای قلبی دارند و با توجه به اینکه پژوهش‌های کمی تأثیر فعالیت ورزشی را روی این عوامل در فرایند هایپرتروفی بیماری‌زای بررسی کرده‌اند، هدف از پژوهش حاضر شناسایی تأثیر هشت هفته تمرین هوازی پیش از القای ایزوپروترنول بر بیان ژن‌های NF-κB و NFAT در بافت بطن چپ موش‌های صحرایی نر نژاد ویستار بود.
مواد و روش‌ها: 18 سر موش صحرایی نر نژاد ویستار به‌طور تصادفی به دو گروه تمرین استقامتی و کنترل تقسیم شدند. تمرینات استقامتی به مدت هشت هفته، یک ساعت در روز و شش روز در هفته روی نوار گردان با شیب 15 درجه انجام گرفت. پس از هشت هفته تمرین، هایپرتروفی بیماری‌زا از طریق تزریق زیرجلدی 3  ایزوپرترنول طی هفت روز القا شد. 24 ساعت پس از آخرین جلسۀ تزریق، موش‌های صحرایی از طریق تزریق درون‌صفاقی 50 میلی‌گرم کتامین و 10 میلی‌گرم زایلازین بی‌هوش شدند. سپس موش‌های صحرایی تشریح شدند و بافت قلب استخراج و به دمای 70- انتقال داده شد. در پژوهش حاضر برای بررسی بیان ژن‌های NF-κB و NFAT از روش Real Time PCR استفاده شد. تجزیه‌وتحلیل داده‌ها با استفاده از نرم‌افزارSPSS  نسخۀ 24 و با استفاده از آزمون t مستقل در سطح معناداری 0۵/۰ ≥P انجام گرفت.
نتایج: یافته‌های پژوهش حاضر نشان داد، شاخص‌های وزن قلب، نسبت وزن قلب به وزن بدن و نسبت وزن بطن چپ به وزن بدن، به‌طور معناداری (01/0P= و 03/0P=) به‌ترتیب در گروه تمرین نسبت به گروه کنترل افزایش پیدا کرده بود. همچنین میزان بیان نسبی ژن NF-κB به‌طور معناداری (03/0P=) در گروه تمرین نسبت گروه کنترل کاهش داشت. در بیان نسبی ژن NFAT تغییر معناداری در گروه‌های مورد بررسی مشاهده نشد (40/0P=).
نتیجه‌گیری: هشت هفته تمرین استقامتی هوازی از طریق کاهش بیان نسبی ژن NF-κB ممکن است نقش مهمی در پیشگیری از هایپرتروفی بیماری‌زای قلبی داشته باشد.

کلیدواژه‌ها


عنوان مقاله [English]

The effect of a period of aerobic endurance training before isoproterenol induction on the expression of NF-κB and NFAT genes in the left ventricular tissue of male Wistar rats

نویسندگان [English]

  • Rahman Soori
  • Mohammad reza Sharbati Biarjomand
  • Siroos Choobineh
Faculty of Physical Education and Sport Sciences, University of Tehran, Tehran, Iran
چکیده [English]

Background and Purpose: Pathogenic cardiac hypertrophy is a type of heart disorder that is associated with changes in the structure of the heart, apoptosis and fibrosis of the heart muscle cells, which leads to a decrease in the pumping ability of the heart and may eventually lead to heart failure and sudden death. It has been shown that the signaling pathway of transcription factors NF-κB and NFAT play an important role in the process of pathogenic hypertrophy of the heart, and considering that few studies have investigated the effect of exercise on these factors in the process of pathogenic hypertrophy,the aim of the present study was to identify the effect of eight weeks of aerobic exercise before isoproterenol induction on the expression of NF-κB and NFAT genes in the left ventricular tissue of male Wistar rats.
Materials and Methods: 18 male Wistar rats were randomly divided into two groups of endurance training and control. Endurance training was performed for eight weeks, one hour a day and six days a week on a treadmill with a slope of 15 degrees. After eight weeks of training, pathological hypertrophy was induced by subcutaneous injection of three mg / kg isoprenaline for seven days. 24 hours after the last injection session, rats were anesthetized by intraperitoneal injection of 50 mg ketamine and 10 mg xylazine. The rats were then dissected and cardiac tissue was extracted and transferred to -70 ° C. Also, in the present study, Real Time PCR was used to evaluate the expression of NF-κB and NFAT genes. Data analysis was performed using SPSS software version 24 and independent t-test at a significance level of P ≥ 0.05
Results: The results of the present study showed that the indices of heart weight, heart weight to body weight ratio (H / W) and left ventricular weight to body weight ratio (V / W) were significantly (P = 0.01) and (P = 0.03): Respectively, increased in the exercise group compared to the control group. Also, the relative expression of NF-κB gene was significantly (P = 0.03) decreased in the exercise group compared to the control group, while the relative expression of NFAT gene was not significantly changed in the study groups (P = 0.40).
Conclusion: Eight weeks of aerobic endurance training may play an important role in the prevention of pathological cardiac hypertrophy by reducing the relative expression of the NF-κB gene.

کلیدواژه‌ها [English]

  • Cardiac fibrosis
  • Isoproterenol
  • Endurance training
  • Heart failure
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  • تاریخ دریافت: 15 خرداد 1401
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  • تاریخ اولین انتشار: 01 شهریور 1401
  • تاریخ انتشار: 01 شهریور 1401