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Related Concept Videos

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Bone Remodeling

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Bone Disorders01:29

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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
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Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.
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The Bone Matrix01:18

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Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in...
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Murine Hind Limb Long Bone Dissection and Bone Marrow Isolation
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Circulating proteins and bone mineral density: A Proteome-Wide Mendelian Randomization Study.

Tianyi Wang1,2, Liu Liu1,3, Ruiying Han1,2

  • 1State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, No.14, 3rd Section of Ren Min Nan Rd., Chengdu, 610041, China.

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|September 5, 2025
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Summary

This study identifies novel genetic targets for bone mineral density (BMD) using proteome-wide Mendelian randomization, offering new avenues for osteoporosis drug development and repurposing.

Keywords:
Bone mineral densitydrug prediction.genome-wide association studymendelian randomizationosteoporosisproteomics

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Area of Science:

  • Genetics and Genomics
  • Pharmacology and Drug Development
  • Bone Biology and Osteoporosis Research

Background:

  • Current osteoporosis medications have limitations in efficacy.
  • Identifying novel druggable genetic targets is crucial for developing improved osteoporosis treatments.
  • Mendelian randomization (MR) offers a robust method to identify causal genetic associations, overcoming limitations of traditional observational studies.

Purpose of the Study:

  • To identify novel, druggable genetic targets for bone mineral density (BMD) using a large-scale proteome-wide Mendelian randomization (pQTL) approach.
  • To validate identified targets through expression quantitative trait loci (eQTL) analysis and functional experiments.
  • To explore potential for drug repurposing and development for osteoporosis.

Main Methods:

  • Employed two-sample Mendelian randomization (MR) utilizing protein quantitative trait loci (pQTL) and expression quantitative trait loci (eQTL) data.
  • Meta-analyzed pQTL evidence across large datasets (deCODE, UKB-PPP) for six bone mineral density (BMD) sites.
  • Conducted MR sensitivity tests, assessed druggability, and performed functional analyses including transcriptomics and OVX experiments.

Main Results:

  • Identified 16 prioritized targets from 5,928 pQTLs, with four novel key druggable targets for BMD: LYN, CHAD, TNFRSF19, and TGFBI.
  • Validated previously suggested targets RSPO3 and SMOC2.
  • Functional analysis revealed elevated TNFRSF19 and TGFBI expression negatively correlated with BMD.

Conclusions:

  • This large-scale Proteome-Wide MR study successfully identified novel genetic targets for BMD at both transcriptional and translational levels.
  • The findings provide new therapeutic insights and present promising prospects for osteoporosis drug repurposing and development.
  • The identified targets (CHAD, LYN, TGFBI, TNFRSF19) represent significant advancements in understanding BMD regulation.