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A New α-Cyclopiazonic Acid Alkaloid Identified from the Weizhou Island Coral-Derived Fungus Aspergillus flavus GXIMD 02503
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作者 WANG Jiamin LI Zhichao +6 位作者 ZHANG Yanting CHEN Chunmei CHEN Weihao GAO Chenghai LIU Yonghong TAN Yanhui LUO Xiaowei 《Journal of Ocean University of China》 SCIE CAS CSCD 2022年第5期1307-1312,共6页
A new oxygenated tricyclic cyclopiazonic acid(CPA)alkaloid,asperorydine Q(1),along with seven known compounds,namely,asperorydines O(2)and J(3),speradine H(4),cyclopiamides A(5)and H(6),saadamysin(7),and pyrazinemetha... A new oxygenated tricyclic cyclopiazonic acid(CPA)alkaloid,asperorydine Q(1),along with seven known compounds,namely,asperorydines O(2)and J(3),speradine H(4),cyclopiamides A(5)and H(6),saadamysin(7),and pyrazinemethanol(8),were isolated from the coral-associated Aspergillus flavus GXIMD 02503.The structures were elucidated by physicochemical properties and comprehensive spectroscopic data analysis.Compounds 1−5 and 7−8 exhibited potent inhibition of lipopolysaccharide(LPS)-induced nuclear factor-κB(NF-κB)with the IC50 values ranging from 6.5 to 21.8μmol L^(−1).In addition,the most potent one,pyrazinemethanol(8),dose-dependently suppressed receptor activator of NF-κB ligand(RANKL)-induced osteoclast differentiation without obvious cytotoxicity in bone marrow macrophages cells(BMMCs),suggesting it is a promising lead compound for the treatment of osteolytic diseases. 展开更多
关键词 coral-derived fungi Aspergillus flavus cyclopiazonic acid NF-κB OSTEOCLASTOGENESIS
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A new linearly-combined bi-exponential model for kinetic analysis of the isometric relaxation process of Bufo gastrocnemius under electric stimulation in vitro 被引量:1
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作者 GUO Rui LI Sheng-bing ZHAO Li-na ZHAO Yun-sheng LU Wei YUAN Pei DENG Ping LIAO Fei 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE CAS CSCD 2007年第12期867-874,共8页
There was a slow-relaxing tail of skeletal muscles in vitro upon the inhibition of Ca2+-pump by cyclopiazonic acid (CPA). Herein, a new linearly-combined bi-exponential model to resolve this slow-relaxing tail from th... There was a slow-relaxing tail of skeletal muscles in vitro upon the inhibition of Ca2+-pump by cyclopiazonic acid (CPA). Herein, a new linearly-combined bi-exponential model to resolve this slow-relaxing tail from the fast-relaxing phase was investigated for kinetic analysis of the isometric relaxation process of Bufo gastrocnemius in vitro, in comparison to the single exponential model and the classical bi-exponential model. During repetitive stimulations at a 2-s interval by square pulses of a 2-ms duration at 12 V direct currency (DC), the isometric tension of Bufo gastrocnemius was recorded at 100 Hz. The relaxation curve with tensions falling from 90% of the peak to the 15th datum before next stimulation was analyzed by three exponential models using a program in MATLAB 6.5. Both the goodness of fit and the distribution of the residuals for the best fitting sup- ported the comparable validity of this new bi-exponential model for kinetic analysis of the relaxation process of the control muscles. After CPA treatment, however, this new bi-exponential model showed an obvious statistical superiority for kinetic analysis of the muscle relaxation process, and it gave the estimated rest tension consistent to that by experimentation, whereas both the classical bi-exponential model and the single exponential model gave biased rest tensions. Moreover, after the treatment of muscles by CPA, both the single exponential model and the classical bi-exponential model yielded lowered relaxation rates, nevertheless, this new bi-exponential model had relaxation rates of negligible changes except much higher rest tensions. These results suggest that this novel linearly-combined bi-exponential model is desirable for kinetic analysis of the relaxation process of muscles with altered Ca2+-pumping activity. 展开更多
关键词 Bufo gastrocnemius Ca^2+ -pump cyclopiazonic acid (CPA) Linearly-combined bi-exponential model Muscle relaxation rate Residual distribution Rest tension
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