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Clin Chim Acta. 2003 Aug;334(1-2):185-95


Effect of Rehmannia glutinosa Libosch extracts on bone metabolism.


Oh KO, Kim SW, Kim JY, Ko SY, Kim HM, Baek JH, Ryoo HM, Kim JK.

OCT Inc., 2-17, Omok-ri, Seonggeo-eup, Choongnam 330-831, Chonan, South Korea


BACKGROUND: Rehmannia glutinosa Libosch extracts (RGX) were investigated to determine if they play roles in bone metabolism.



The effects on osteoblasts were determined by measuring (1) cell proliferation, (2) alkaline phosphatase (ALP) activity, (3) mRNA expression of bone-related proteins, (4) transcriptional activity of Runx2, and (5) osteoprotegerin (OPG) secretion.

The effects on the osteoclasts were investigated by measuring (1) tartrate-resistant acid phosphatase-positive [TRAP(+)] multinucleated cell (MNC) formation and (2) resorption areas after culturing osteoclast precursors.

Bone mineral density (BMD) measurements and histological observations on rats were also carried out.


RESULTS: RGX treatment showed a significant increase in both the proliferation and ALP activity of osteoblasts. RGX increased the expression of the bone-related genes. OPG secretion was markedly increased after RGX treatment. In addition, RGX treatment decreased the number of TRAP(+) MNCs and the resorption areas. In vivo studies using ovariectomy-induced osteoporotic rats revealed that RGX alleviated the decrease in the trabecular BMD, and increased the cortical bone thickness and trabeculation of the bone marrow spaces.


CONCLUSIONS: RGX stimulates the proliferation and activities of osteoblasts, while inhibiting the generation and resorptive activities of osteoclasts. It also shows preventive effects on osteoporotic bone loss induced by an ovariectomy. Although the active substances have not yet been identified, it is believed that the RGX seems to contain active components that have a potential to enhance the bone metabolism in osteoporosis.




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