ارزیابی تاثیر آفلاتوکسین B1 بر تمایز نورونی و تکوین هیپوکامپ موش های صحرایی

محورهای موضوعی : پاتوبیولوژی مقایسه ای

سارا الهوئی نظری ¹ (گروه زیست شناسی، دانشکده علوم پایه، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران)
نسیم حیاتی رودباری ² (استاد گروه زیست شناسی، دانشکده علوم پایه، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران)
کاظم پریور ³ (گروه زیست شناسی، دانشکده علوم پایه، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران)
اکرم عیدی ⁴ (گروه زیست شناسی، دانشکده علوم پایه، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران)

تاریخ دریافت : 1400/08/12 تاریخ پذیرش : 1400/08/12 تاریخ انتشار : 1400/03/01

کلید واژه: آفلاتوکسین B1, GFAP, NeuN, هیپوکامپ, Ki-67,

چکیده مقاله :

سم آفلاتوکسین B1 آثار زیان باری بر سیستم عصبی-مغزی دارد. از اینرو در این مطالعه به بررسی تاثیرات آفلاتوکسین B1 بر تکوین هیپوکامپ موش های صحرایی نوزاد پرداخته شد. در این مطالعه پس از تهیه و آماده سازی آفلاتوکسین B1، از 18 سر موش ماده ی باردار نژاد ویستار با سن چهار هفته و وزن متوسط 10±85 گرم استفاده گردید. حیوانات در سه گروه شم (دریافت کننده ی روغن کنجد به عنوان حلال آفلاتوکسین B1)، آفلاتوکسین B1 و کنترل سالم تقسیم بندی شدند و در یک دوره ی تیماری سه ماهه جهت بررسی تغییرات ایمونوهیستوشیمی مارکرهای Ki-67، NeuN و GFAP بافت هیپوکامپ در موش های ویستار مورد استفاده قرار گرفتند. طبق نتایج بدست آمده از مطالعات ایمونوهیستوشیمی، گروه های تیمار شده با آفلاتوکسین B1 کاهش آماری معنی داری در بیان Ki-67 و NeuN نسبت به گروه کنترل نشان دادند (01/0>P). در حالیکه میزان بیان مارکر GFAP در مقایسه با گروه کنترل، افزایش آماری معنی داری (01/0>P) یافته بود. از طرفی کاهش چشمگیری در بیان پروتئین های NeuN و Ki-67و افزایش در میزان بیان GFAP مشاهده گردید که این یافته ها همراه با مشاهدات حاصل از عکس برداری ایمونوهیستوشیمی فلورسنت تایید گردید. آفلاتوکسین B1 با ایجاد اختلال در میزان فعالیت و بیان پروتئین های حیاتی در ناحیه هیپوکامپ منجر به اختلال در تمایز نورونی و افزایش صدمات مغزی می شود که این علائم با کاهش شدید در NeuN و افزایش در GFAP اثبات گردید.

چکیده انگلیسی:

Aflatoxin B1 has harmful effects on the nervous-cerebral system. Therefore, in this study the effects of Aflatoxin B1 on the development of the hippocampus of neonatal rats were investigated. After the preparation of Aflatoxin B1, 18 pregnant female Wistar rats with an average weight of 85±10 g were used. Animals were divided into three groups: sham (receiving sesame oil as a solvent of Aflatoxin B1), Aflatoxin B1 and Healthy control. According to the results of immunohistochemical studies, Aflatoxin B1 treated groups showed a statistically significant decrease in Ki-67 and NeuN expression compared to the control group (P <0.01). While the expression level of the GFAP in comparison with the control group had a statistically significant increase (P <0.01). On the other hand, a significant decrease in the expression of NeuN and Ki-67 proteins and an increase in the expression of GFAP were observed, which were confirmed by observations from fluorescent immunohistochemical imaging. Aflatoxin B1 disrupts neuronal differentiation and increases brain damage by disrupting the activity and expression of vital proteins in the hippocampus, which was demonstrated by a sharp decrease in NeuN and an increase in GFAP.

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