Xiudong Yang1, Zi-Fan Bai2, Yan Zhang2, Hao Cui2, Hong-Li Zhou3. 1. School of Chemistry and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin City, 132022, PR China; Engineering Research Center for Agricultural Resources and Comprehensive Utilization of Jilin Provence, Jilin Institute of Chemical Technology, Jilin, 132022, China. 2. School of Chemistry and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin City, 132022, PR China. 3. School of Chemistry and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin City, 132022, PR China; Engineering Research Center for Agricultural Resources and Comprehensive Utilization of Jilin Provence, Jilin Institute of Chemical Technology, Jilin, 132022, China. Electronic address: zhouhongli@jlict.edu.cn.
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE: As a traditional Chinese medicinal, Bidens bipinnata L. has been used to treat many diseases with a long history in China. The anti-diabetic effects of extract from B. bipinnata have been demonstrated in the previous reports. AIM OF THE STUDY: The protective effects of flavonoids-rich extract from B. bipinnata (BBTF) on cell damage induced by H2O2 in pancreatic β cell and its potential mechanisms were evaluated. MATERIALS AND METHODS: MTT, ROS production, nuclear staining and flow cytometry assays were adopted to determine the effects of BBTF on cell viability, production of ROS and cell apoptosis in H2O2-treated INS-1 cell. Cell apoptosis-related proteins expressions were detected by Western blot assay. RESULTS: Pre-treatment of BBTF could significantly increase INS-1 cell viability, inhibit the production of intracellular ROS and reduced the characteristic features of cell apoptosis induced by H2O2 in INS-1 cells. The studies of the underlying mechanism showed that BBTF could regulate Bax and Bcl-2 proteins expressions, suppress the phosphorylation of JNK, ERK and p38, as well as down-regulate Fas and FasL proteins expressions induced by H2O2. The expressions of caspase-8, caspase-9 and caspase-3 were therefore decreased. CONCLUSION: The results indicated that flavonoids-rich extract from B. bipinnata could be a natural agent in diabetic prevention and therapy.
ETHNOPHARMACOLOGICAL RELEVANCE: As a traditional Chinese medicinal, Bidens bipinnata L. has been used to treat many diseases with a long history in China. The anti-diabetic effects of extract from B. bipinnata have been demonstrated in the previous reports. AIM OF THE STUDY: The protective effects of flavonoids-rich extract from B. bipinnata (BBTF) on cell damage induced by H2O2 in pancreatic β cell and its potential mechanisms were evaluated. MATERIALS AND METHODS:MTT, ROS production, nuclear staining and flow cytometry assays were adopted to determine the effects of BBTF on cell viability, production of ROS and cell apoptosis in H2O2-treated INS-1 cell. Cell apoptosis-related proteins expressions were detected by Western blot assay. RESULTS: Pre-treatment of BBTF could significantly increase INS-1 cell viability, inhibit the production of intracellular ROS and reduced the characteristic features of cell apoptosis induced by H2O2 in INS-1 cells. The studies of the underlying mechanism showed that BBTF could regulate Bax and Bcl-2 proteins expressions, suppress the phosphorylation of JNK, ERK and p38, as well as down-regulate Fas and FasL proteins expressions induced by H2O2. The expressions of caspase-8, caspase-9 and caspase-3 were therefore decreased. CONCLUSION: The results indicated that flavonoids-rich extract from B. bipinnata could be a natural agent in diabetic prevention and therapy.