Protective effect of hypoxylonol C and 4,5,4′,5′-tetrahydroxy-1,1′-binaphthyl isolated from Annulohypoxylon annulatum against streptozotocin induced
- Protective effect of hypoxylonol C and 4,5,4′,5′-tetrahydroxy-1,1′-binaphthyl isolated from Annulohypoxylon annulatum against streptozotocin induced
- 함정엽; 김태정; 김진철; 최필주; 김영석; 이다혜; 황병수; 송지훈; 박정식; 황귀서; Noriko Yamabe; 강기성
- Annulohypoxylon annulatum; Pancreatic β-cells; Apoptosis; Streptozotocin
- Issue Date
- Bioorganic chemistry
- VOL 90-103053-7
- We evaluated the protective effects of hypoxylonol C and 4,5,4′,5′-tetrahydroxy-1,1′-binaphthyl (BNT) isolated from Annulohypoxylon annulatum on pancreatic β-cell apoptosis, using the β-cell toxin streptozotocin (STZ). Hypoxylonol C and BNT restored the STZ-induced decrease in INS-1 cell viability in a dose-dependent manner. In addition, treatment of INS-1 cells with 50  μM STZ resulted in an increase in apoptotic cell death, which was observed as annexin V fluorescence intensity. Apoptotic cell death was decreased by co-treatment with 100  μM hypoxylonol C and 100  μM BNT. Similarly, STZ caused a marked increase in the expression of cleaved caspase-8, caspase-3, Bax, and poly (ADP-ribose) polymerase (PARP), as well as a decrease in the expression of B-cell lymphoma 2 (Bcl-2), which was reversed by co-treatment with 100  μM BNT. These findings suggest that hypoxylonol C and BNT play an important role in protecting pancreatic β-cells against apoptotic damage.
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