Astragaloside IV attenuates inflammatory cytokines by inhibiting TLR4/NF-кB signaling pathway in isoproterenol-induced myocardial hypertrophy

Abstract

Ethnopharmacological relevanceAstragaloside IV (As IV) is one of the main effective components isolated from the traditional Chinese medical herb Astragalus membranaceus. The protective effect of Astragalus membranaceus on myocardial hypertrophy has been extensively proved. To test the hypothesis that Astragaloside IV can ameliorate the myocardial hypertrophy and inflammatory effect induced by β-adrenergic hyperactivity, we carried out in vivo and in vitro experiments. Material and methodsIn in vivo study, the isoproterenol (Iso) (5mgkg−1d−1) was used as a model of myocardial hypertrophy by intraperitoneal injection. SD rats were randomly assigned to following six groups: A: the control; B: Iso group; C: Iso plus As IV 20mgkg−1d−1; D: Iso plus As IV 40mgkg−1d−1; E: Iso plus As IV 80mgkg−1d−1; F: Iso plus Propranolol 40mgkg−1d−1. In in vitro study, cultured neonatal rat cardiomyocytes were pretreated with As IV (3, 10, 30μmolL−1), Propranolol (2μmolL−1) and BAY11-7082 (5μmolL−1) for 30min, and then incubated with Iso (10μmolL−1) for 48 h. For the rats in each group, the heart mass index (HMI) and the left ventricular mass index (LVMI) were measured. To measure the transverse diameter of left ventricular myocardial cells (TDM), the hematoxylin-eosin (HE) staining method was applied. In addition, the volume and the total protein content of cardiomyocytes were measured, the mRNA expression of ANP and TLR4 were quantified by RT-PCR, the protein expression of TLR4, IκBα and p65 were quantified by Western blot, and the level of TNF-α and IL-6 were measured by ELISA. ResultsIn vivo: Comparing the Iso group to the control, the HMI, LVMI, TDM were significantly increased; the protein expression of TLR4 and p65 were increased, while the IκBα were decreased; the expression of ANP, TLR4 mRNA, and TNF-α, IL-6 in serum were significantly increased. These changes could be partly prevented by As IV and Pro. In vitro: the over-expression of the cell size, total protein content could remarkably down-regulated by As IV and Pro, and the results of RT-PCR, Western blot and ELISA were similar to those of in vivo. ConclusionsThe results of these studies indicate that Astragaloside IV has good protective effect on myocardial hypertrophy induced by isoproterenol. More specifically, the cardioprotection is related to inhibiting the TLR4/NF-кB signaling pathway and the attenuating inflammatory effect.