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Related Concept Videos

Bone Remodeling01:40

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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Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during...
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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Hormones and Bone Tissue01:17

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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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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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Related Experiment Video

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[Exercise regulates bone metabolism via microRNAs].

Yu Yuan1, Lin-Zhen Rao1, Shi-Hua Zhang1,2

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Sheng Li Xue Bao : [Acta Physiologica Sinica]
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Exercise influences bone metabolism by regulating microRNAs (miRNAs). This review explores how exercise-induced miRNA changes promote bone health and offer insights for preventing and treating osteoporosis.

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Area of Science:

  • Bone Biology and Metabolism
  • Molecular Biology and Genetics

Background:

  • Exercise is known to positively impact bone metabolism, promoting growth and preventing bone loss.
  • MicroRNAs (miRNAs) are crucial regulators of bone cell proliferation, differentiation, and the balance between bone formation and resorption.
  • Dysregulation of miRNAs is implicated in bone diseases like osteoporosis.

Approach:

  • This review synthesizes current research on the role of miRNAs in mediating the effects of exercise on bone metabolism.
  • It examines how exercise and mechanical stress alter miRNA expression profiles in bone tissue.
  • The review analyzes the downstream effects of these miRNA changes on osteogenic and bone resorption factors.

Key Points:

  • Exercise modulates miRNA expression in bone, influencing the activity of bone marrow mesenchymal stem cells, osteoblasts, and osteoclasts.
  • Specific miRNAs targeted by exercise can regulate the expression of key factors involved in bone formation and resorption.
  • This miRNA-mediated pathway is a significant mechanism through which exercise promotes a positive bone metabolic balance.

Conclusions:

  • Exercise-induced regulation of miRNAs provides a molecular mechanism for its beneficial effects on bone health.
  • Understanding these miRNA pathways can lead to novel therapeutic strategies for osteoporosis and other bone metabolic disorders.
  • Targeting specific miRNAs offers a promising avenue for exercise-based interventions to enhance bone metabolism.