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Bone remodeling.

Dimitrios J Hadjidakis1, Ioannis I Androulakis

  • 1Second Department of Internal Medicine, Propaedeutic and Research Institute, Athens University, Attikon University Hospital, Rimini 1, Haidari 124 62, Greece. dhadjida@med.uoa.gr

Annals of the New York Academy of Sciences
|February 20, 2007
PubMed
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Bone remodeling is a continuous lifelong process involving osteoclasts and osteoblasts to maintain skeletal integrity and calcium homeostasis. This complex cycle is regulated by systemic hormones and local factors, including the RANK/RANKL/OPG system.

Area of Science:

  • Skeletal Biology
  • Bone Physiology
  • Cellular Biology

Background:

  • The skeleton is a dynamic, metabolically active organ.
  • Bone remodeling is a continuous process throughout life, essential for skeletal health.
  • This process involves the coordinated action of osteoclasts and osteoblasts.

Purpose of the Study:

  • To describe the phases and functions of bone remodeling.
  • To outline the systemic and local regulators of bone remodeling.
  • To explain the role of the RANK/RANKL/OPG system in coupling bone resorption and formation.

Main Methods:

  • Review of existing literature on bone remodeling.
  • Analysis of the cellular mechanisms involved in resorption and formation.
  • Identification of key regulatory factors and pathways.

Related Experiment Videos

Main Results:

  • Bone remodeling occurs in three phases: resorption, reversal, and formation.
  • It adapts bone architecture, repairs microdamage, and maintains calcium homeostasis.
  • Systemic hormones (PTH, calcitriol) and local factors (cytokines, growth factors) regulate the process.

Conclusions:

  • Bone remodeling is a tightly regulated, cyclical process vital for skeletal integrity.
  • The RANK/receptor activator of NF-kappa B ligand (RANKL)/osteoprotegerin (OPG) system is crucial for coupling resorption and formation.
  • Understanding these mechanisms is key to addressing skeletal disorders.