Growth Factor Regulation in Bone Metabolism
Summary
Bone metabolism is orchestrated by a network of growth factors that govern the balance between bone formation and resorption. Central among these are growth hormone (GH), which acts both directly on bone cells and indirectly via insulin-like growth factor-1 (IGF-1), and members of the bone morphogenetic protein (BMP) family, which drive differentiation of progenitor cells within the growth plate. Transforming growth factor-β (TGF-β) and fibroblast growth factors (FGFs) further refine osteoblast and osteoclast activity through paracrine and autocrine loops. Mechanical forces transduced by integrins modulate IGF-1 receptor sensitivity, while interactions with Wnt and parathyroid hormone pathways establish feedback mechanisms essential for skeletal adaptation. Local production of IGF-1 by osteoblasts and chondrocytes complements hepatic endocrine pools, ensuring site-specific control of endochondral ossification and cortical remodelling. Dysregulation of these signalling axes underlies conditions such as osteoporosis, fracture non-union and growth plate disorders, highlighting their value as therapeutic targets for enhancing bone strength and repair.
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Growth Factor Regulation in Bone Metabolism publication trend
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Technical terms
Autocrine signalling: A mode of hormone action in which a cell secretes a factor that binds to receptors on its own surface.
Endochondral ossification: The process by which cartilage is replaced by bone, essential for longitudinal growth.
IGF-1 (Insulin-like growth factor-1): A hormone mediating many of the anabolic effects of GH on bone and muscle.
IGFBP (Insulin-like growth factor binding protein): A family of proteins that bind IGFs, modulating their half-life and bioavailability.
Osteoblast: A bone-forming cell responsible for matrix synthesis and mineralisation.
Osteoclast: A bone-resorbing cell that degrades mineralised matrix during remodelling.
Paracrine signalling: Communication whereby secreted factors act on neighbouring cells within the same tissue.
References
- The Effects of Natural Product-Derived Extracts for Longitudinal Bone Growth: An Overview of In Vivo Experiments. International Journal of Molecular Sciences (2023).
- Controversial causal association between IGF family members and osteoporosis: a Mendelian randomization study between UK and FinnGen biobanks. Frontiers in Endocrinology (2024).
- Global and Conditional Disruption of the Igf-I Gene in Osteoblasts and/or Chondrocytes Unveils Epiphyseal and Metaphyseal Bone-Specific Effects of IGF-I in Bone. Biology (2023).
- Effect of GH/IGF‐1 on Bone Metabolism and Osteoporsosis. International Journal of Endocrinology (2014).
- Regulation of Ligand and Shear Stress-induced Insulin-like Growth Factor 1 (IGF1) Signaling by the Integrin Pathway*. Journal of Biological Chemistry (2016).
- IGF-I induced phosphorylation of PTH receptor enhances osteoblast to osteocyte transition. Bone Research (2018).
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