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J.Health Sci., 53(5), 571-575, 2007

Preventive Effects of Bee Pollen Cistus ladaniferus Extract on Bone Loss in Ovariectomized Rats In Vivo

Masayoshi Yamaguchi,* Satoshi Uchiyama, and Taeko Nakagawa

Laboratory of Endocrinology and Molecular Metabolism, Graduate School of Nutritional Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan

The effect of bee pollen Cistus ladaniferus extract on ovariectomy (OVX)-induced bone loss in vivo was investigated. The water-solubilized extracts were obtained from the bee pollen of Cistus ladaniferus. Cistus extract (5.0 or 10.0 mg/100 g body weight) was orally administered once daily for 30 days to OVX rats. The analysis using a peripheral quantitative computed tomography (pQCT) showed that OVX-induced a significant decrease in mineral content, mineral density, and polar strength strain index in the femoral-metaphyseal tissues. These decreases were significantly prevented after the administration of cistus extract (10.0 mg/100 g). Moreover, OVX-induced a significant decrease in calcium content in the femoral-diaphyseal and -metaphyseal tissues. This decrease was significantly prevented after the administration of cistus extract (5.0 or 10.0 mg/100 g). This study demonstrates that cistus extract has a preventive effect on OVX-induced bone loss in vivo.