نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار بیوشیمی، گروه علمی زیست‌شناسی، دانشگاه پیام نور، تهران، ایران

2 استادیار بیوشیمی، گروه علمی زیست‌شناسی، دانشگاه پیام نور، تهران، ایران

3 دانشجوی کارشناسی ارشد بیوشیمی، گروه علمی زیست‌شناسی، دانشگاه پیام نور، تهران، ایران

چکیده

زمینه و هدف: بیماریهای تحلیل برنده سیستم عصبی به دلیل عواملی چون افزایش جمعیت سالمندان، افزایش طول عمر و فقدان داروهای موثر یک معضل جهانی می باشد. به نظر می رسد مولکولهای دارای حلقه های آروماتیک بوسیله مهار یا تغییر تجمع آمیلوئیدی و مانع شدن از ایجاد الیگومرها و فیبریلها که عامل بوجود آورنده این بیماریهاست نقش محافظت کننده از نورونها ایفا می کنند. در مطالعه حاضر اثرات مهاری 1و3و5 تری فنیل بنزن به عنوان یک مولکول آروماتیک روی تجمع و سمیت لیزوزیم مورد مطالعه قرار گرفت
مواد و روشها: لیزوزیم با غلظت 2 میلی گرم بر میلی لیتر در بافر گلایسین 50 میلی مولار و شرایط اسیدی حل شدو سپس در دمای 57 درجه برای مدت مشخصی در حضور یا غیاب تری فنیل بنزن قرار داده شد.اثر مهاری این ترکیب روی لیزوزیم با استفاده از تکنیکهایی مثل میکروسکوپ نیروی اتمی، تیوفلاوین T ، قرمز کنگو و سنجش MTT مورد مطالعه قرار گرفت.
یافته ها: داده های ما نشان داد که این ترکیب قادر به مهار تجمع لیزوزیم بصورت وابسته به غلظت و با IC50 برابر 1/0 میکرو مولار می باشد. مطالعه سینتیکی این ترکیب باعث طولانی شدن فاز تاخیر و کاهش فاز تعادل گردیدو همچنین سمیت تجمعات لیزوزیم در حضور این ترکیب کاهش معنی داری(025/0 p= ) یافت.
نتیجه گیری: این مشاهدات نشان داد که تری فنیل بنزن قادر به وارد شدن به بخش مستعد تولید آمیلوئید در مراحل اولیه تشکیل تجمع بوده و باعث مهار تشکیل آن می شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Synthesis and Identification of Novel Aromatic Compound as Inhibitor of Lysozyme Amyloid Aggregation

نویسندگان [English]

  • Hassan Ramshini 1
  • Shahryar Saeidian 2
  • Leila Nazemian 3

1 Associate Professor, Department of Biology, Payam Noor University, Tehran, Iran

2 Assistant Professor, Department of Biology, Payam Noor University, Tehran, Iran

3 MSc, Department of Biology, Payam Noor University, Tehran, Iran

چکیده [English]

Backgrounds & Objectives: Alzheimer's disease is of major concern all over the world due to a number of factors including (i) an aging population (ii) increasing life span and (iii) lack of effective pharmacotherapy options. Aromatic small molecules have been found to play a neuroprotective role by inhibiting and/or modifying the self-assembly of peptide or proteins into oligomers and fibrils, which are linked to the pathogenesis of the diseases. In this study, the inhibitory effects of 1,3, 5 triphenyl benzene as an aromatic molecule on aggregation and neurotoxicity of hen egg white lysozyme (HEWL) was investigated.
Methods: Acidic pH and high temperatures were used to drive the protein towards amyloid formation. Lysozyme was dissolved at 2 mg/mL in 50mM glycine buffer (pH 2.5), and then incubated at 57 °C for the specified durations. The inhibitory effect of the compounds against hen egg white lysozyme (HEWL) fibrillation using AFM (atomic force microscope), ThT (thioflavin T), Congo red and MTT assay was investigated.
Results: We found that the compounds is able to inhibit HEWL aggregation in a dose-dependent manner with IC50 0.1 µM. Kinetic study of the compound caused lag phase prolonged and stationary phase decreased and also cytotoxic activity of HEWL aggregates in presence of the compounds was diminished.
Conclusions: These observations suggest that 1,3,5 triphenyl benzene is capable to insert directly into amyloidogenic core of early aggregates and inhibiting amyloid fibril formation.

کلیدواژه‌ها [English]

  • Lysozyme
  • Amyloid aggregation
  • Cell cytotoxicity
  • Tri phenyl benzene
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