Astragaloside benefit in medicine
March 11 2016
J Ethnopharmacol. 2013. Astragaloside IV attenuates inflammatory cytokines by inhibiting TLR4/NF-кB signaling pathway in isoproterenol-induced myocardial hypertrophy.
Biol Pharm Bull. 2013. Effects of Astragaloside IV on Action Potentials and Ionic Currents in Guinea-Pig Ventricular Myocytes. Department of Pharmaceutical Toxicology, School of Pharmaceutical Science, China Medical University. Astragaloside IV (AS-IV) is one of the main active constituents of Astragalus membranaceus, which has various actions on the cardiovascular system. However, its electrophysiological mechanisms are not clear. In the present study, we investigated the effects of AS-IV on action potentials and membrane currents using the whole-cell patch clamp technique in isolated guinea-pig ventricular myocytes. AS-IV prolonged the action potential duration (APD) at all three tested concentrations. Astragaloside IV prolonged APD of guinea-pig ventricular myocytes, which might be explained by its inhibition of IK. AS-IV also influences Ca(2+) signaling through suppressing ICaL.
Astragaloside IV regulates expression of ATP-sensitive
potassium channel subunits after ischemia-reperfusion in rat ventricular
J Tradit Chin Med. 2011. Han XH, Liu P, Zhang YY, Zhang N, Chen FR, Cai JF. Scientific Research Center, Longhua Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China.
Astragaloside IV (AsIV) is the major effective component extracted from the Chinese herb Astragalus membranaceus, which has been widely used to treat cardiovascular disease. Recent studies have shown that AsIV can potentially protect the heart from myocardial ischemic injury, but the mechanisms of action are unknown. ATP-sensitive potassium (KATP) channels are activated during ischemia and exert a compensatory protective effect on cardiomyocytes. We therefore examined the effects of AsIV on KATP channel currents and channel expression in isolated rat ventricular cardiomyocytes after ischemia-reperfusion injury. Forty Wistar rats were divided into five groups: control group, ischemia-reperfusion (IP) group, IP + glibenclamide group, IP + pinacidil group and IP + AsIV group. The ischemia-reperfusion injury model was established in enzymatically isolated ventricular cardiomyocytes by perfusion with calcium-free Tyrode solution for 10 min, arrest for 30 min, and reperfusion for 45 min. The different drugs were applied for 10-15 min, and the KATP channel current (I(KATP)) was recorded with voltage-clamp mode by whole-cell patch-clamp technique. Protein and mRNA expression of the KATP channel subunits Kir6.1, Kir6.2, SUR2A and SUR2B was quantified using western blotting and real-time PCR. The KATP current in IP group was significantly greater than that in control group. Glibenclamide (10 micromol/L) blocked KATP currents, whereas both AsIV (1 mg/L) and the known channel opener pinacidil (50 micromol/L) significantly increased I(KATP). Consistent with this, AsIV significantly up-regulated protein and mRNA expression of Kir6.1, Kir6.2, SUR2A, SUR2B. The protective effects of AsIV in ischemia-reperfusion injury may be related to the up-regulation of several KATP channel subunits and facilitation of KATP currents.
Astragalosides isolated from the root of
Astragalus radix inhibit the formation
of advanced glycation end products.
J Agric Food Chem. 2009; Motomura K, Kiyota N, Tsurushima K, Takeya M, Nohara T. Department of Natural Medicine, Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan.
Because advanced glycation end product (AGE) inhibitors such as pyridoxamine significantly inhibit the development of retinopathy and neuropathy in the streptozotocin-induced diabetic rat, treatment with AGE inhibitors is believed to be a potential strategy for the prevention of lifestyle-related diseases such as diabetic complications. A crude extract of Astragali Radix (AR; roots of Astragalus membranaceus ) inhibits the formation of N(epsilon)-(carboxymethyl)lysine (CML) and pentosidine during the incubation of bovine serum albumin with ribose. In the present study, compounds were isolated from AR that prevented CML and pentosidine formation. Astragalosides significantly inhibited the formation of both CML and pentosidine, and astragaloside V had the strongest inhibitory effect among all if the isolated compounds. These data suggest that AR and astragalosides may be a potentially useful strategy for the prevention of clinical diabetic complications by inhibiting advanced glycation end products.