Recent advances in osteoclast biology

Area of Science:

• Bone biology and skeletal physiology.

Background:

• Bone tissue maintains locomotion, protection, hematopoiesis, and mineral homeostasis through continuous resorption and formation.
• Osteoclasts, multinucleated cells derived from monocytes/macrophages, are responsible for bone resorption.
• Osteoclast differentiation is regulated by macrophage colony-stimulating factor (M-CSF) and receptor activator of nuclear factor-κB ligand (RANKL).

Purpose of the Study:

• To review current findings on osteoclast biology.
• To summarize the role of RANKL/RANK signaling in osteoclastogenesis.
• To highlight the implications of RANKL signaling dysregulation in bone diseases.

Main Methods:

• This review synthesizes existing research on osteoclast differentiation and function.
• It examines the molecular mechanisms of RANKL/RANK signaling pathway.
• Literature search and analysis of studies on bone remodeling and related diseases were performed.

Main Results:

• RANKL binding to its receptor RANK initiates signaling cascades, notably activating NFATc1, the key regulator of osteoclastogenesis.
• Various cell types express RANKL, influencing osteoclast formation based on biological context.
• Aberrant RANKL signaling is implicated in skeletal pathologies.

Conclusions:

• Osteoclast activity, regulated by RANKL/RANK signaling, is fundamental to bone homeostasis.
• Understanding this pathway is critical for addressing bone diseases such as osteoporosis and osteopetrosis.
• Further research into RANKL/RANK signaling holds therapeutic potential for skeletal disorders.