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Nuclear translocation of PTH receptor hijacks thyroid hormone signaling for bone mass regulation [ChIP-Seq]

ABSTRACT: Nuclear translocation of PTH receptor hijacks thyroid hormone signaling for bone mass regulation [ChIP-Seq]

PROVIDER: PRJNA975173 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR26918667_1.fastq.gz	Fastqsanger.gz
	SRR26918667_2.fastq.gz	Fastqsanger.gz
	SRR26918668_1.fastq.gz	Fastqsanger.gz
	SRR26918668_2.fastq.gz	Fastqsanger.gz
	SRR26918669_1.fastq.gz	Fastqsanger.gz

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Nuclear translocation of PTH receptor hijacks thyroid hormone signaling for bone mass regulation

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Nuclear translocation of PTH receptor hijacks thyroid hormone signaling for bone mass regulation [RNA-seq]

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The osteocytic actions of glucocorticoids on bone mass, mechanical properties, or perilacunar remodeling outcomes are not rescued by PTH

Project description: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. Focusing on subchondral bone and joint homeostasis, we hypothesize that PTH, a PLR agonist, could rescue GC-suppressed PLR. The skeletal effects of GC and PTH, 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 than males. GC and PTH exerted regional differences, with GC increasing trabecular bone volume but reducing cortical bone thickness, stiffness, and ultimate force. Despite PTH’s anabolic effects on trabecular bone, it did not rescue GC’s catabolic effects on cortical bone. Likewise, cartilage integrity and subchondral bone apoptosis, alkaline phosphatase activity, and osteocyte lacunocanalicular networks showed no evidence that PTH could offset GC-dependent effects. Rather, GC and PTH each increased cortical bone gene expression implicated in bone resorption by osteoclasts and osteocytes, including Acp5, Mmp13, Atp6v0d2, Ctsk, differences maintained when GC and PTH were combined. Since PTH 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.

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