سلولز باکتریایی پوشیده شده با ژلاتین، داربستی برای مهندسی بافت قلب

نویسندگان
1 گروه زیست شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران
2 گروه زیست شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران: گروه پژوهشی روشهای تشخیص و درمانهای نوین، پژوهشکده فناوری زیستی، دانشگاه فردوسی مشهد، مشهد، ایران
چکیده
مقدمه

انفارکتوس قلبی یکی از دلایل اصلی مرگ و میر در سرتاسر جهان است. میزان بازسازی بافت قلبی پس از انفارکتوس قلبی محدود است. ترکیب سلول درمانی با فناوری مهندسی بافت می­تواند منجر به کاربردهای بالینی گسترده­ای گردد. در این مطالعه، داربست­هایی را برای پشتیبانی از چسبندگی و رشد کاردیومیوسیت­ها به منظور کاربرد در مهندسی بافت قلب مورد بررسی قرار دادیم.

مواد و روش­‌ها

ابتدا داربست سلولز باکتریایی (BC) تهیه گردید و با ژلاتین پوشش داده شد تا ساختاری از سلولز پوشیده شده با ژلاتین(BCG) بدست آید. خصوصیات داربست­های BC و­ BCG با استفاده از میکروسکوپ الکترونی روبشی، میکروسکوپ الکترونی روبشی نشر میدانی و میکروسکوپ نیروی اتمی و روش رطوبت­پذیری مورد بررسی قرار گرفت. در ادامه جهت سنجش کارایی (میزان چسبندگی و بقای سلولی) داربست­های مزبور، کاردیومیوسیت­های بطنی نوزاد رت بر روی داربست­ها کشت داده شدند و با فیبروبلاست­های پوستی انسانی (HDF) مورد مقایسه قرار گرفتند.

یافته‌­ها

نتایج نشان داد که قطر متوسط نانوفیبریل­ها و زبری سطح به منظور کشت کاردیومیوسیت‌ها مناسب می­باشد. فعالیت انقباضی خودبخودی کاردیومیوسیت­ها تا پایان دوره آزمایش، ماندگار بود ولی از روز 5 تا 7 به تدریج اندکی کاهش یافت. با توجه به نتایج تصاویر میکروسکوپ نوری، چسبندگی HDFs بر روی داربست­ها در تمام طول دوره آزمایش، بیش از چسبندگی کاردیومیوسیت­­ها بود.

نتیجه­‌گیری

BC و BCG علاوه بر نداشتن سمیت سلولی، دارای خصوصیات فیزیکوشیمیایی مناسب جهت حفظ شکل ظاهری و عملکرد انقباضی سلول‌ها‌ی کاردیومیوسیت نوزاد دوروزه رت می‌باشند.
کلیدواژه‌ها

عنوان مقاله English

Bacterial Cellulose Encapsulated in Gelatin as a Scaffold for Cardiac Tissue Engineering

نویسندگان English

Mohaddeseh Salehghamari 1
Maryam Moghaddam matin 2
Zeinab Neshati 2
1 Department of Biology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
2 Department of Biology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran;Novel Diagnostics and Therapeutics Research Group, Institute of Biotechnology, Ferdowsi University of Mashhad, Mashhad, Iran
چکیده English

Introduction

Myocardial infarction is one of the leading causes of death worldwide. The rate of heart tissue regeneration is limited following myocardial infarction. The combination of cell therapy and tissue engineering technology can lead to widespread clinical applications. In this study, we investigated the capability of the scaffolds to support cardiomyocyte attachment and growth cardiac tissue engineering.

Materials and Methods

A bacterial cellulose (BC) scaffold was prepared and coated with gelatin to form a gelatin-coated BC (BCG) scaffold. BC and BCG scaffolds were characterized using SEM, FE-SEM, AFM, and contact angle measurements. Neonatal rat-ventricular cardiomyocytes (nr-vCMCs) were cultured on scaffolds to explore the capability of the scaffolds (for cell attachment and survival) and were compared with human dermal fibroblasts (HDFs)

Results

The results showed that the average diameter of nanofibrils and surface roughness were suitable for cardiomyocyte culture. The contractile activity of nr-vCMCs remained during culture duration, but the mean beating frequency gradually decreased from the fifth to seventh day of culture. According to the results of light microscopy images, the adhesion of HDFs on the scaffolds was greater than cardiomyocyte attachment throughout the cell culture duration.

Conclusion

In addition to not being cytotoxic, BC and BCG have the appropriate physicochemical properties to preserve the morphology and contractile function of neonatal rat cardiomyocytes.

کلیدواژه‌ها English

Cardiac tissue engineering
Bacterial cellulose scaffold
Gelatin
Neonatal rat- ventricular cardiomyocytes
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