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Osteoclasts in 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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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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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 growth and maintenance of bone are regulated by a combination of nutritional factors, including vitamins, such as vitamin A, B12, C, D, and K.
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The minerals contained in all of the food we consume are essential for our organ systems. However, certain essential minerals, such as calcium, phosphorus, magnesium, manganese, and fluoride, largely affect bone health.
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Related Experiment Video

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Author Spotlight: Integrating Traditional Chinese Medicine with Modern Pharmacology and Genomics for Assessing Postmenopausal Osteoporosis in Mice
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Osteoporosis Therapeutics 2020.

Roland Kocijan1, Klaus Klaushofer1, Barbara M Misof2

  • 1Ludwig Boltzmann Institute of Osteology at Hanusch Hospital of OEGK and AUVA Trauma Centre Meidling, 1st Med. Dept. Hanusch Hospital, Vienna, Austria.

Handbook of Experimental Pharmacology
|August 9, 2020
PubMed
Summary
This summary is machine-generated.

This review summarizes current and novel drug therapies for osteoporosis, detailing their effectiveness in reducing fractures and improving bone mineral density (BMD). Understanding drug mechanisms is crucial for treatment decisions and interpreting outcomes.

Keywords:
Anabolic treatmentAntiresorptive treatmentBone tissue and material qualityOsteoporosis guidelinesOsteoporosis management

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Area of Science:

  • Endocrinology
  • Rheumatology
  • Pharmacology

Background:

  • Osteoporosis poses a significant fracture risk across various patient demographics.
  • Numerous established and emerging pharmacotherapies aim to mitigate this risk.

Purpose of the Study:

  • To provide an overview of clinical trial outcomes for osteoporosis therapies.
  • To elucidate the mechanisms of action of these drugs at the bone tissue/material level.
  • To review current treatment guidelines and management strategies for different osteoporosis forms.

Main Methods:

  • Analysis of phase III clinical study data for established (Bisphosphonates, Denosumab, Teriparatide) and novel (Romosozumab, Abaloparatide) osteoporosis therapies.
  • Review of current treatment guidelines and literature on osteoporosis management.
  • Consideration of adverse effects associated with osteoporosis treatments.

Main Results:

  • Established and novel therapies demonstrate efficacy in reducing fracture risk and improving bone mineral density (BMD).
  • Understanding drug mechanisms is key for optimizing treatment selection, duration, and interpreting clinical outcomes.
  • Current guidelines provide frameworks for managing diverse osteoporosis presentations.

Conclusions:

  • Pharmacological interventions are vital for managing osteoporosis and preventing fractures.
  • Mechanistic insights enhance the clinical application and interpretation of osteoporosis treatments.
  • Adherence to guidelines and awareness of potential adverse effects are essential for safe and effective patient care.