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  • Title: Serum osteocalcin and urinary crosslaps are suitable markers of bone turnover in response to short-term hormone replacement therapy.
    Author: Peichl P, Griesmacher A, Müller MM, Marteau R, Kumpan W, Bröll H.
    Journal: Gynecol Endocrinol; 2000 Oct; 14(5):374-81. PubMed ID: 11109977.
    Abstract:
    In this study we evaluated the effect of short-term hormone replacement therapy (HRT) on bone formation (serum osteocalcin) and resorption markers (urinary type I collagen peptides (crosslaps), urinary total free pyridinoline (TPYRI) and urinary free deoxypyridinoline (DPYRI)) as well as female sex hormones (serum estradiol, follicle stimulating hormone (FSH) and luteinizing hormone (LH)) in a group of early postmenopausal women with severe estrogen deficiency. The 46 healthy postmenopausal women with serum estradiol levels < 10 ng/l were subsequently divided into two groups, according to their compliance with HRT. In the group taking HRT significant changes from baseline values could be observed in estradiol, FSH, urinary crosslaps and serum osteocalcin levels after 6 months, whereas no changes could be observed in LH, TPYRI and DPYRI from baseline values. In the group which refused HRT all values were increased relative to baseline values, indicating increased bone turnover. Serum osteocalcin and urinary crosslaps were significantly decreased in women taking HRT in comparison to the group refusing HRT. After 6 months the treated patients showed a decrease in urinary crosslaps of 42% (SD 12%) and in serum osteocalcin of 24% (SD 6%) in comparison with baseline values. In patients who refused HRT, urinary crosslaps were increased by 43% (SD 20%) and serum osteocalcin levels decreased by 2% (SD 9%) compared to baseline values. In postmenopausal women suffering from severe estrogen deficiency (estradiol < 10 ng/l) serum osteocalcin and urinary crosslaps are significantly increased, indicating a clear correlation between estrogen deficiency and an increase in bone resorption as well as bone formation. The recommended HRT dose was sufficient to reduce the rate of bone turnover to premenopausal values. Serum osteocalcin and urinary crosslaps are suitable candidates not only for the assessment of a high postmenopausal bone turnover, but also for monitoring the response to and for verifying the actual intake of HRT or other antiresorptive treatment.
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