بازدارنده پروتئازوم

از ویکی‌پدیا، دانشنامهٔ آزاد
فرمول ساختاری بورتزومیب، نخستین داروی بازدارندهٔ پروتئازوم که مورد پذیرش واقع شد.

بازدارنده‌های پروتئازوم (انگلیسی: Proteasome inhibitors) گروهی از داروها هستند که کارشان، مهار عملکرد پروتئازوم‌هاست. (مجموعه‌های پروتئینی‌ای که کارشان حذف پروتئین‌های غیرضروری یا آسیب‌دیده در سلول است)

این گروه از داروها، هم‌اکنون در دست پژوهش و بررسی برای درمان سرطان هستند و سه تای آنها برای درمان مولتیپل میلوما مورد پذیرش واقع شده‌است.

نخستین بازدارندهٔ غیر پپتیدی پروتئازوم که کشف شد، مادهٔ طبیعی لاکتاسیستین بود.[۱] برخی دیگر از بازدارندهٔ پروتئازوم عبارتند از: دی‌سولفیرام،[۲][۳][۴] اپی‌گالوکتشین گالات،[۵] سالینوسپرامید آ، اپوکسومایسین[۶] و بتا-هیدروکسی بتا-متیل‌بوتیریک اسید[۷][۸] (درون‌جانداری).[۹]

منابع[ویرایش]

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  7. Wilson JM, Fitschen PJ, Campbell B, Wilson GJ, Zanchi N, Taylor L, Wilborn C, Kalman DS, Stout JR, Hoffman JR, Ziegenfuss TN, Lopez HL, Kreider RB, Smith-Ryan AE, Antonio J (February 2013). "International Society of Sports Nutrition Position Stand: beta-hydroxy-beta-methylbutyrate (HMB)". J. Int. Soc. Sports. Nutr. 10 (1): 6. doi:10.1186/1550-2783-10-6. PMC 3568064. PMID 23374455. Skeletal muscle proteolysis is increased in catabolic states such as fasting, immobilization, aging, and disease [77]. HMB has been shown to decrease skeletal muscle protein degradation both in vitro[72,73] and in vivo[78]. ... Indeed, HMB has been shown to decrease proteasome expression [72] and activity [72,78-80] during catabolic states, thus attenuating skeletal muscle protein degradation through the ubiquitin-proteasome pathway.
  8. Luckose F, Pandey MC, Radhakrishna K (2015). "Effects of amino acid derivatives on physical, mental, and physiological activities". Crit. Rev. Food Sci. Nutr. 55 (13): 1793–1807. doi:10.1080/10408398.2012.708368. PMID 24279396. HMB, a derivative of leucine, prevents muscle damage and increases muscle strength by reducing exercise-induced proteolysis in muscles and also helps in increasing lean body mass.
  9. Wilkinson DJ, Hossain T, Hill DS, Phillips BE, Crossland H, Williams J, Loughna P, Churchward-Venne TA, Breen L, Phillips SM, Etheridge T, Rathmacher JA, Smith K, Szewczyk NJ, Atherton PJ (June 2013). "Effects of leucine and its metabolite β-hydroxy-β-methylbutyrate on human skeletal muscle protein metabolism" (PDF). J. Physiol. 591 (11): 2911–2923. doi:10.1113/jphysiol.2013.253203. PMC 3690694. PMID 23551944. Retrieved 27 May 2016. Interestingly, although orally supplied HMB produced no increase in plasma insulin, it caused a depression in MPB (−57%). Normally, postprandial decreases in MPB (of ∼50%) are attributed to the nitrogen-sparing effects of insulin since clamping insulin at post-absorptive concentrations (5 μU ml−1) while continuously infusing AAs (18 g h−1) did not suppress MPB (Greenhaff et al. 2008), which is why we chose not to measure MPB in the Leu group, due to an anticipated hyperinsulinaemia (Fig. 3C). Thus, HMB reduces MPB in a fashion similar to, but independent of, insulin. These findings are in-line with reports of the anti-catabolic effects of HMB suppressing MPB in pre-clinical models, via attenuating proteasomal-mediated proteolysis in response to LPS (Eley et al. 2008).[پیوند مرده]