The aim of this study is to investigate the functional relationship between filamin, a known actin binding protein, and myosin and the effects of filamin on the interaction between myosin and actin. Methods.Ultra cent...The aim of this study is to investigate the functional relationship between filamin, a known actin binding protein, and myosin and the effects of filamin on the interaction between myosin and actin. Methods.Ultra centrifugation method was used to investigate the binding of filamin to both phosphorylated and unphosphorylated myosins. Mg ATPase activities of both phosphorylated and unphosphorylated myosins in the presence and absence of actin were measured to observe the effects resulted from filamin actin and filamin myosin interactions. Results. It was found that filamin is also a myosin binding protein. Filamin inhibited the actin activated Mg ATPase activity of phosphorylated myosin and stimulated Mg ATPase of phosphorylated myosin in the absence of actin; in addition, filamin stimulated Mg ATPase activity of unphosphorylated myosin in both the presence or absence of actin. Conclusion. The results suggest that the effects of filamin on the myosin Mg ATPase activities are bi directional, i.e., stimulatory via binding to myosin and inhibitory via binding to actin.展开更多
Objective： To explore the mechanism of acupuncture in treating brain aging. Methods： Forty healthy Wistar rats were randomly divided into 4 groups with 10 rats in each group. The rats in the control group didn＇t re...Objective： To explore the mechanism of acupuncture in treating brain aging. Methods： Forty healthy Wistar rats were randomly divided into 4 groups with 10 rats in each group. The rats in the control group didn＇t received modeling and treatment. The rats in the model group, the Governor Vessel acupoints group （GVA group） and the body acupoints group （BA group） were induced as subacute aging rat model. The rats in the model group didn＇t take treatment. On the modeling day, the rats in the GVA group received acupuncture at Baihui （GV 20） and Dazhui （GV 14） while the rats in the BA group received acupuncture at Guanyuan （CV 3） and Zusanli （ST 36）. The contents of NO and NOS, as well as the activity of Ca^2＋-Mg^2＋-ATPase in the brain tissue of rats in each group were observed. Results： After modeling, the contents of NO and NOS of brain tissue increased significantly and the activity of Ca2^＋-Mg^2＋-ATPase decreased markedly. Acupuncture treatment could inhibit the increases of NO and NOS contents, improve the decrease of the activity of Ca^2＋-Mg^2＋-ATPase. The results of the GVA group were better than those of BA group （both P〈0.05）. Conclusion： Acupuncture improved the activity of Ca^2＋-Mg^2＋-ATPase and stabilized the NOS concentration. As a result, the NO content was balanced and the ohvsiological function of NO was fully induced for anti-a^in~, esoeciallv in the GVA group.展开更多
文摘The aim of this study is to investigate the functional relationship between filamin, a known actin binding protein, and myosin and the effects of filamin on the interaction between myosin and actin. Methods.Ultra centrifugation method was used to investigate the binding of filamin to both phosphorylated and unphosphorylated myosins. Mg ATPase activities of both phosphorylated and unphosphorylated myosins in the presence and absence of actin were measured to observe the effects resulted from filamin actin and filamin myosin interactions. Results. It was found that filamin is also a myosin binding protein. Filamin inhibited the actin activated Mg ATPase activity of phosphorylated myosin and stimulated Mg ATPase of phosphorylated myosin in the absence of actin; in addition, filamin stimulated Mg ATPase activity of unphosphorylated myosin in both the presence or absence of actin. Conclusion. The results suggest that the effects of filamin on the myosin Mg ATPase activities are bi directional, i.e., stimulatory via binding to myosin and inhibitory via binding to actin.
基金supported by the Science and Technology Research Project of the Department of Education of Heilongjiang Province(11551449)
文摘Objective： To explore the mechanism of acupuncture in treating brain aging. Methods： Forty healthy Wistar rats were randomly divided into 4 groups with 10 rats in each group. The rats in the control group didn＇t received modeling and treatment. The rats in the model group, the Governor Vessel acupoints group （GVA group） and the body acupoints group （BA group） were induced as subacute aging rat model. The rats in the model group didn＇t take treatment. On the modeling day, the rats in the GVA group received acupuncture at Baihui （GV 20） and Dazhui （GV 14） while the rats in the BA group received acupuncture at Guanyuan （CV 3） and Zusanli （ST 36）. The contents of NO and NOS, as well as the activity of Ca^2＋-Mg^2＋-ATPase in the brain tissue of rats in each group were observed. Results： After modeling, the contents of NO and NOS of brain tissue increased significantly and the activity of Ca2^＋-Mg^2＋-ATPase decreased markedly. Acupuncture treatment could inhibit the increases of NO and NOS contents, improve the decrease of the activity of Ca^2＋-Mg^2＋-ATPase. The results of the GVA group were better than those of BA group （both P〈0.05）. Conclusion： Acupuncture improved the activity of Ca^2＋-Mg^2＋-ATPase and stabilized the NOS concentration. As a result, the NO content was balanced and the ohvsiological function of NO was fully induced for anti-a^in~, esoeciallv in the GVA group.
