Effects of a New Selective Estrogen Receptor Modulator (MDL 103,323) on Cancellous and Cortical Bone in Ovariectomized Ewes: A Biochemical, Histomorphometric, and Densitometric Study
作者:Pascale Chavassieux、Patrick Garnero、Francois Duboeuf、Philippe Vergnaud、Francoise Brunner-Ferber、Pierre D. Delmas、Pierre J. Meunier
DOI:10.1359/jbmr.2001.16.1.89
日期:——
The aims of this study performed in ewes were: (1) to confirm in this animal model the effects on bone of ovariectomy (OVX) alone or associated with Lentaron (L), a potent peripheral aromatase inhibitor, used to amplify the effects of OVX and (2) to evaluate the effects of a new selective estrogen receptor modulator (SERM; MDL 103,323) on bone remodeling. Thirty‐nine old ewes were divided into five groups: sham (n = 7); OVX (n = 8); OVX + L (n = 8); OVX + L + MDL; 0.1 mg/kg per day (n = 8); and OVX + L + MDL 1 mg/kg per day (n = 8). The animals were treated for 6 months. Biochemical markers of bone turnover (urinary excretion of type 1 collagen C‐telopeptide [CTX], serum osteocalcin [OC], and bone alkaline phosphatase [BAP]) were measured each month. Bone biopsy specimens were taken at the beginning and after death at the end of the experiment. Bone mineral density (BMD) was measured by dual‐energy X‐ray absorptiometry (DXA) on the lumbar spine and femur. OVX induced a significant increase in biochemical markers. This effect was the highest after 3 months for CTX (+156% vs. sham) and after 4 months for OC and BAP (+74% and +53% vs. sham, respectively). L tended to amplify the effect of OVX on OC and BAP. OVX induced significant increases in the porosity, eroded, and osteoid surfaces in cortical bone but no effect was observed in cancellous bone. MDL treatment reduced the bone turnover as assessed by bone markers, which returned to sham levels as well as histomorphometry both in cortical and in cancellous bone. Cancellous osteoid thickness decreased by 27% (p < 0.05), mineralizing perimeter by 81% (p < 0.05), and activation frequency by 84% (p < 0.02) versus OVX + L. Femoral and spinal BMD were increased by MDL and tended to return to the sham values. The effects of OVX on bone turnover were different on cortical and cancellous bone. These effects on cortical bone were reflected by changes in biochemical markers. MDL markedly reduces bone turnover and increases BMD suggesting that this new agent may prevent postmenopausal bone loss.
本研究在母羊中进行,旨在:(1) 在这一动物模型中确认单独或联合使用强效外周芳香化酶抑制剂Lentaron(L)的卵巢切除术(OVX)对骨骼的影响,以增强OVX的效果;(2) 评估一种新的选择性雌激素受体调节剂(SERM;MDL 103,323)对骨重建的影响。研究共纳入39只老母羊,分为五组:假手术组(n = 7);OVX组(n = 8);OVX + L组(n = 8);OVX + L + MDL 0.1 mg/kg每日至(n = 8);OVX + L + MDL 1 mg/kg每日至(n = 8)。动物治疗持续了6个月。每月测量骨代谢的生化标记物(尿中1型胶原C末端肽[CTX]、血清骨钙素[OC]和骨碱性磷酸酶[BAP])。在实验开始时及结束时对死亡后的骨活检标本进行取样。通过双能X射线吸收法(DXA)测量腰椎和股骨的骨矿密度(BMD)。OVX显著提高了生化标记物的水平。这一效应在3个月后CTX达到最高值(+156%对比假手术组),在4个月后OC和BAP分别增加了74%和53%。L倾向于增强OVX对OC和BAP的影响。OVX使皮质骨的孔隙度、侵蚀面和骨样面显著增加,但海绵骨未观察到影响。MDL治疗降低了骨代谢,生化标记物恢复至假手术组水平,组织形态学分析显示皮质和海绵骨均如此。海绵骨骨样厚度减少了27%(p < 0.05),矿化边缘减少了81%(p < 0.05),激活频率减少了84%(p < 0.02),相较于OVX + L组。MDL使股骨和脊柱的BMD增加,并趋向恢复至假手术组水平。OVX对骨代谢的影响在皮质骨和海绵骨上有所不同。这些对皮质骨的影响体现在生化标记物的变化上。MDL显著降低了骨代谢并增加了BMD,提示该新剂可能预防绝经后骨质流失。