Concerted action of androgens and mechanical strain shifts bone metabolism from high turnover into an osteoanabolic mode.

Concerted action of androgens and mechanical strain shifts bone metabolism from high turnover into an osteoanabolic mode.
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DOI:
10.1084/jem.20021017
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发表时间:
2002-11-18
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Kasperk C
Kasperk C
中科院分区:
其他
文献类型:
--
作者:
Liegibel UM;Sommer U;Tomakidi P;Hilscher U;Van Den Heuvel L;Pirzer R;Hillmeier J;Nawroth P;Kasperk C

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骨细胞与细胞外基质的粘附是成骨细胞发育和功能的关键要求。粘附受体将细胞外基质与细胞骨架连接并将基质变形传递到细胞中。我们检验了性激素通过影响粘附分子如纤连蛋白和纤连蛋白受体的表达来调节人成骨细胞(HOB)机械感知的假设。只有双氢睾酮(DHT),而不是17β-雌二醇,刺激纤维连接蛋白(137%)和纤维连接蛋白受体(252%)的蛋白表达。在FlexerCell®菌株单元中研究了变形应变对HOB代谢的影响。周期性应用应变(2.5%伸长率)增加DNA合成(125%)和白细胞介素-6(IL-6)的生产(170%),而不显着影响碱性磷酸酶(AP)的活性,I型胶原(PICP),或骨保护素(OPG)的分泌。10 nM DHT预处理消除了HOB对菌株的促有丝分裂反应,并增加了AP活性(119%)、PICP(163%)和OPG产生(204%)。总之,机械应变通过增加HOB有丝分裂和IL-6的产生来刺激骨重建。DHT通过增加AP活性和PICP产生增加骨形成来增强变形应变的骨合成代谢影响。同时,骨吸收受到IL-6减少和骨微环境中OPG分泌增加的抑制。
Adhesion of bone cells to the extracellular matrix is a crucial requirement for osteoblastic development and function. Adhesion receptors connect the extracellular matrix with the cyto-skeleton and convey matrix deformation into the cell. We tested the hypothesis that sex hormones modulate mechanoperception of human osteoblastic cells (HOB) by affecting expression of adhesion molecules like fibronectin and the fibronectin receptor. Only dihydrotestosterone (DHT), but not 17β-estradiol, stimulated fibronectin (137%) and fibronectin receptor (252%) protein expression. The effects of deformation strain on HOB metabolism were investigated in a FlexerCell® strain unit. Cyclically applied strain (2.5% elongation) increased DNA synthesis (125%) and interleukin-6 (IL-6) production (170%) without significantly affecting alkaline phosphatase (AP) activity, type I collagen (PICP), or osteoprotegerin (OPG) secretion. 10 nM DHT pretreatment abolished the mitogenic response of HOB to strain and increased AP activity (119%), PICP (163%), and OPG production (204%). In conclusion, mechanical strain stimulates bone remodeling by increasing HOB mitosis and IL-6 production. DHT enhances the osteoanabolic impact of deformation strain by increasing bone formation via increased AP activity and PICP production. At the same time, bone resorption is inhibited by decreased IL-6 and increased OPG secretion into the bone microenvironment.
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