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Related Concept Videos

Skeleton and Calcium Homeostasis01:21

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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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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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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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The Parathyroid Glands00:59

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The two pairs of parathyroid glands embedded within the posterior surface of the thyroid gland are restricted by a dense capsule around them. These glands comprise two distinct cell populations—parathyroid oxyphil and parathyroid principal cells- pivotal in calcium homeostasis.
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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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Related Experiment Video

Updated: Oct 23, 2025

Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model
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PGC-1: a key regulator in bone homeostasis.

Haoling Chen1,2, Wenguo Fan1,2, Hongwen He3

  • 1Hospital of Stomatology, Sun Yat-Sen University, 56 Lingyuan Xi Road, Guangzhou, 510055, China.

Journal of Bone and Mineral Metabolism
|August 23, 2021
PubMed
Summary

Peroxisome proliferator-activated receptor-γ coactivator-1 alpha (PGC-1α) and PGC-1β are key regulators of mitochondrial function in bone. This review explores their roles in bone cell development and potential therapeutic applications for metabolic bone diseases.

Keywords:
Mitochondrial biogenesisOsteoblastogenesisOsteoclastogenesisPGC-1αPGC-1β

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Endocrinology

Background:

  • Peroxisome proliferator-activated receptor-γ coactivator-1 (PGC-1) proteins are crucial inducible co-regulators of nuclear receptors.
  • PGC-1α and PGC-1β are master regulators of mitochondrial biogenesis and function, impacting cellular energy demands.
  • These coactivators are rapidly induced during high metabolic activities like osteoblastogenesis and osteoclastogenesis.

Purpose of the Study:

  • To review the current understanding of PGC-1α and PGC-1β roles in bone metabolism.
  • To elucidate the regulation of PGC-1α and PGC-1β in maintaining bone homeostasis.
  • To explore the therapeutic potential of PGC-1 coactivators for bone metabolic diseases.

Main Methods:

  • Literature review of existing studies on PGC-1α, PGC-1β, and bone metabolism.
  • Analysis of gene expression related to mitochondrial biogenesis and bone cell differentiation.
  • Examination of PGC-1 coactivator interactions with transcription factors.

Main Results:

  • PGC-1α and PGC-1β differentially regulate osteoblastogenesis and osteoclastogenesis.
  • Both coactivators promote mitochondrial biogenesis gene expression in bone cells.
  • PGC-1α and PGC-1β exhibit overlapping and distinct functions in various target organs, including bone.

Conclusions:

  • PGC-1α and PGC-1β are critical for bone homeostasis by regulating mitochondrial function and cell-specific differentiation.
  • Understanding their regulatory mechanisms offers potential therapeutic strategies for bone metabolic disorders.
  • Targeting PGC-1 coactivators may provide novel treatments for diseases affecting bone health.