Shibimijihwang-tang elevates intracellular ATP and choline content in the cerebral cortex of ovariectomized rats

Abstract

Shibimijihwang-tang (SJT) has been used traditionally to improve systemic blood circulation and biological energy production in patients with circulatory and neuronal diseases. The object of this study is to determine the effect of SJT extract on the intracellular adenosine triphosphate (ATP) and choline content in the cerebral cortex of ovariectomized (OVX) rats. Bilateral ovaries of 8-week-old rats were removed. Rats were maintained for 12 weeks to deplete ovarian steroid hormones, followed by treatment with SJT at 500 mg/kg body weight per day for 12 weeks. High rate of body weight increase in the OVX rats was markedly reduced by treatment with SJT, but the change in body weight of normal rats was not affected by it. SJT also significantly reduced the decline of cerebral weight in the OVX rats ( P<0.05). Tissue glucose content in the cerebral cortex of OVX rats was significantly increased by SJT treatment ( P<0.05). A decline in cerebral ATP content in OVX rats was dramatically restored by SJT administration ( P<0.01), but SJT did not change the cerebral ATP content in normal rats. Cerebral choline content also declined following ovariectomy. This reduction was significantly elevated by SJT treatment ( P<0.05), but SJT did not affect the change in cerebral choline in normal rats. Taken together, these results demonstrate that SJT can reduce the decrease in brain weight, cerebral ATP and choline content caused by deprivation of ovarian steroid hormones. This suggests that pharmacological properties of SJT may play a role in improvement of reduced cerebral energy production and cholinergic neurotransmitter synthesis caused by deficiency of ovarian steroid hormones in the cerebroneuronal cells of postmenopausal women.