糖皮质激素对骨量、力学性能或骨陷窝周围改建结果的成骨细胞作用不能被 PTH(1-34)挽救。

The osteocytic actions of glucocorticoids on bone mass, mechanical properties, or perilacunar remodeling outcomes are not rescued by PTH(1-34).

机构信息

Department of Orthopaedic Surgery, University of California, San Francisco, San Francisco, CA, United States.

Endocrine Research Unit, San Francisco Veterans Affairs Medical Center, University of California, San Francisco, CA, United States.

出版信息

Front Endocrinol (Lausanne). 2024 Jul 18;15:1342938. doi: 10.3389/fendo.2024.1342938. eCollection 2024.

Abstract

Glucocorticoids (GC) and parathyroid hormone (PTH) are widely used therapeutic endocrine hormones where their effects on bone and joint arise from actions on multiple skeletal cell types. In osteocytes, GC and PTH exert opposing effects on perilacunar canalicular remodeling (PLR). Suppressed PLR can impair bone quality and joint homeostasis, including in GC-induced osteonecrosis. However, combined effects of GC and PTH on PLR are unknown. Given the untapped potential to target osteocytes to improve skeletal health, this study sought to test the feasibility of therapeutically mitigating PLR suppression. Focusing on subchondral bone and joint homeostasis, we hypothesize that PTH(1-34), a PLR agonist, could rescue GC-suppressed PLR. The skeletal effects of GC and PTH(1-34), alone or combined, were examined in male and female mice by micro-computed tomography, mechanical testing, histology, and gene expression analysis. For each outcome, females were more responsive to GC and PTH(1-34) than males. GC and PTH(1-34) exerted regional differences, with GC increasing trabecular bone volume but reducing cortical bone thickness, stiffness, and ultimate force. Despite PTH(1-34)'s anabolic effects on trabecular bone, it did not rescue GC's catabolic effects on cortical bone. Likewise, cartilage integrity and subchondral bone apoptosis, tartrate-resistant acid phosphatase (TRAP) activity, and osteocyte lacunocanalicular networks showed no evidence that PTH(1-34) could offset GC-dependent effects. Rather, GC and PTH(1-34) each increased cortical bone gene expression implicated in bone resorption by osteoclasts and osteocytes, including , differences maintained when GC and PTH(1-34) were combined. Since PTH(1-34) is insufficient to rescue GC's effects on young female mouse bone, future studies are needed to determine if osteocyte PLR suppression, due to GC, aging, or other factors, can be offset by a PLR agonist.

摘要

糖皮质激素(GC)和甲状旁腺激素(PTH)是广泛应用的治疗性内分泌激素,它们对骨骼和关节的作用源于对多种骨骼细胞类型的作用。在骨细胞中,GC 和 PTH 对骨陷窝和骨小管改建(PLR)有相反的作用。PLR 抑制可损害骨质量和关节稳态,包括 GC 诱导的骨坏死。然而,GC 和 PTH 对 PLR 的联合作用尚不清楚。鉴于针对骨细胞进行靶向治疗以改善骨骼健康的潜力尚未开发,本研究旨在测试治疗性缓解 PLR 抑制的可行性。本研究聚焦于软骨下骨和关节稳态,假设甲状旁腺素(1-34)(PLR 激动剂)可挽救 GC 抑制的 PLR。通过微计算机断层扫描、机械测试、组织学和基因表达分析,单独或联合使用 GC 和 PTH(1-34)检查雄性和雌性小鼠的骨骼效应。对于每种结果,雌性对 GC 和 PTH(1-34)的反应均强于雄性。GC 和 PTH(1-34)具有区域性差异,GC 增加了小梁骨体积,但减少了皮质骨厚度、刚度和最大力。尽管 PTH(1-34)对小梁骨具有合成作用,但它并未挽救 GC 对皮质骨的分解代谢作用。同样,软骨完整性和软骨下骨凋亡、抗酒石酸酸性磷酸酶(TRAP)活性和骨细胞陷窝小管网络均表明,PTH(1-34)不能抵消 GC 依赖性作用。相反,GC 和 PTH(1-34)均增加了与破骨细胞和骨细胞骨吸收相关的皮质骨基因表达,包括,当 GC 和 PTH(1-34)联合使用时,这些差异得以维持。由于 PTH(1-34)不足以挽救 GC 对年轻雌性小鼠骨骼的作用,因此需要进一步研究以确定由于 GC、衰老或其他因素引起的骨细胞 PLR 抑制是否可以被 PLR 激动剂抵消。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/872c/11291448/5bf86aa440f3/fendo-15-1342938-g001.jpg

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