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Korean Journal of Obstetrics & Gynecology 2004;47(4):656-662.
Published online April 1, 2004.
The Relationship between Parathyroid Hormone Gene BstBI Polymorphism, Bone Mineral Density and Bone Responsiveness to Hormone Replacement Therapy in Postmenopausal Korean Women.
Jung Gu Kim, Seung Yup Ku, Seok Hyun Kim, Young Min Choi, Shin Yong Moon, Jin Yong Lee
Department of Obstetrics and Gynecology, College of Medicine, Seoul National University, Seoul, Korea.
To evaluate the relationship between parathyroid hormone (PTH) gene BstBI polymorphism, bone mineral density (BMD) and bone responsiveness to hormone replacement therapy (HRT). METHODS: PTH BstBI polymorphism was determined by restriction fragment length polymorphism (RFLP) in 444 postmenopausal Korean women. Among these women, 309 women received sequential HRT for 1 year. Serum bone alkaline phosphatase, CrossLaps, osteocalcin, calcitonin, and parathyroid hormone levels were measured by immunoassay and serum calcium and phosphorus levels by atomic absorptiometry. BMD at the lumbar spine and proximal femur was determined by dual energy X-ray absorptiometry before and after HRT of 1 year. RESULTS: PTH genotype frequencies were 81.1% for BB, 18.0% for Bb, and 1.2% for bb (uppercase letters signifying the absence and lowercase letters the presence of the restriction site). BMD at the femoral neck in women with the bb genotype was higher than that in women with the Bb or BB genotype respectively. Similar trend was found in BMD of lumbar spine and Ward's triangle. The PTH genotypes were not distributed differently between HRT-responders and HRT-nonresponders (women who lose more than 3% of bone mass per year) and were not related with annual percent change of BMD after HRT. There were no significant differences in levels of PTH, calcitonin, calcium, phophorus and bone turnover markers or their 6 month percentage changes after HRT among PTH genotypes. CONCLUSION: PTH BstBI polymorphism is not associated with bone responsiveness to HRT but BMD in Korean women.
Key Words: Postmenopausal women, Parathyroid hormone, BstBI polymorphism, BMD, HRT

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