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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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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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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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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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Pathophysiology and Molecular Signalling in Osteoporosis: Linking Risk Factors to Bone Loss.

Pramoda G1, Kamini Shivhare1, Piyush Kumar Gupta2

  • 1Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER)-Raebareli, Lucknow, Uttar Pradesh, India.

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Summary

Osteoporosis, a bone disorder, affects many elderly Indians. Understanding its complex mechanisms is crucial for developing better treatments to improve bone health and reduce fracture risks.

Keywords:
RANKL–OPG axisWnt/β‐catenin signallingbone metabolismbone remodellingosteoporosispathophysiologyrisk factorsvitamin D

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Area of Science:

  • Bone Biology and Skeletal Disorders
  • Pathophysiology of Osteoporosis
  • Molecular Mechanisms of Bone Remodeling

Background:

  • Osteoporosis is a major skeletal disorder causing reduced bone mass and increased fracture risk, significantly impacting public health globally and in India.
  • Current osteoporosis treatments face limitations including poor adherence, low bioavailability, and potential cardiovascular risks, highlighting the need for improved interventions.
  • Effective prevention and therapy require a deep understanding of osteoporosis pathophysiology, necessitating a comprehensive review of bone biology and disease mechanisms.

Purpose of the Study:

  • To provide an integrated overview of normal bone remodeling and the cellular players involved.
  • To elucidate the key mechanisms and signaling pathways underlying osteoporosis pathophysiology.
  • To summarize major risk factors and their links to bone loss, aiming to identify novel therapeutic targets.

Main Methods:

  • Review of normal bone remodeling processes and cellular functions (osteoblasts, osteoclasts).
  • Discussion of critical regulatory factors and signaling pathways (e.g., RANKL-OPG, Wnt/β-catenin, PTH/PTH1R, TGF-β/BMP-SMAD).
  • Synthesis of major risk factors (ageing, hormones, nutrition, lifestyle, comorbidities) and their mechanistic links to bone loss.

Main Results:

  • Detailed explanation of the roles of osteoblasts, osteoclasts, and progenitor cells in bone homeostasis.
  • Comprehensive analysis of molecular pathways driving osteoporosis pathogenesis.
  • Identification of diverse risk factors and their contribution to impaired bone health.

Conclusions:

  • A thorough understanding of osteoporosis pathogenesis is essential for developing advanced diagnostic and therapeutic strategies.
  • This review synthesizes current knowledge to facilitate the identification of novel molecular targets for osteoporosis.
  • Enhanced understanding of bone remodeling and risk factors can lead to safer and more effective interventions for osteoporosis.