Preventive effects of a herbal medicine on bone loss in rats treated with a GnRH agonist

S. Sakamoto, Shuji Sassa, Hideki Kudo, Shinya Suzuki, T Mitamura, Hiroshi Shinoda
In: European Journal of Endocrinology · 2000 · vol. 143(1) , pp. 139–142 · doi:10.1530/eje.0.1430139 · PMID:10870043 · W2158557138
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⚙ AI-generated summary by claude@2026-06, 2026-06-09 ⓘ

Hochu-ekki-to, a herbal medicine, increased bone mineral density and serum estradiol levels in rats treated with a GnRH agonist, counteracting chemically induced bone loss.

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Abstract

The study was designed to evaluate the effects of a traditional Chinese herbal medicine Hochu-ekki-to (Bu-zong-yi-qi-tang), which was composed of 10 herbal medicines and had been used for the treatment of oligospermia and as a postoperative medication in Japan, on bone loss in rats treated with a gonadotropin-releasing hormone (GnRH) agonist. Female rats at 40 weeks of age were divided into 4 groups of 8 rats each. In the three experimental groups, each animal received subcutaneous injections of the long-acting GnRH agonist, buserelin acetate, once every four weeks throughout the experiment. Beginning at 48 weeks of age, the experimental groups were given diets containing conjugated estrogens or Hochu-ekki-to for 8 weeks. The administration of the GnRH agonist reduced the bone mineral density in the whole femur to 91.0% of that in the control group. However, administration of conjugated estrogens and Hochu-ekki-to increased the serum concentrations of estradiol 16.8- and 5.3-fold respectively compared with concentrations in the GnRH agonist-treated group, resulting in the augmentation of the bone mineral density to 110.3% and 106.2% respectively. These findings indicate that Hochu-ekki-to enhances the reduced bone mineral density and causes a slight elevation of the serum estradiol levels in the chemically castrated rats.

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