Involvement of bone in systemic endocrine regulation

The role of bone in endocrine regulation is an emerging area of research. Prior studies have established bone as a target for systemic hormones. However, recent evidence suggests that bone itself acts as an endocrine organ. This shift in understanding highlights the need to explore how bone-derived hormones influence other systems. Bone cells, particularly osteocytes, are now recognized as key players in this process. These cells respond to mechanical and hormonal signals. They regulate bone remodeling and also produce signaling molecules. The connection between bone and phosphate metabolism is well-documented. However, the broader endocrine functions of bone remain less understood.

This review aims to examine how bone hormones interact with phosphate and energy homeostasis. The focus is on the hormonal network involving osteocytes and osteoblasts. The study explores the role of these cells in regulating phosphate metabolism. It also investigates their influence on energy balance and reproduction. The authors seek to clarify the mechanisms through which bone hormones act. They highlight the role of vitamin D derivatives and phosphatonins. The goal is to synthesize current knowledge on these interactions. This work addresses a gap in understanding the systemic effects of bone-derived hormones.

The authors conducted a literature review focusing on bone endocrinology. They examined studies on osteocytes and osteoblasts as endocrine cells. The review included research on bone-derived hormones like sclerostin and FGF23. They analyzed the interaction of these hormones with kidney and parathyroid functions. The study also looked at how osteocalcin affects other tissues. The authors synthesized findings on phosphate and energy regulation. They evaluated the role of bone hormones in male reproduction. The review approach was structured around key hormonal pathways and their physiological effects.

Osteocytes produce sclerostin and RANKL, which regulate bone remodeling. These cells also secrete phosphatonins like FGF23 and active vitamin D. FGF23 influences phosphate metabolism and vitamin D levels. Osteoblasts secrete osteocalcin, which acts on multiple organs. Osteocalcin interacts with GPRC6A receptors in various tissues. This interaction modulates energy metabolism and male reproductive functions. The review highlights the role of bone hormones in chronic kidney disease. These findings suggest a broader endocrine role for bone beyond skeletal health.

The authors synthesize evidence that bone functions as an endocrine organ. They emphasize the role of osteocytes and osteoblasts in hormone production. Bone-derived hormones influence phosphate and energy homeostasis. These hormones also affect male reproductive systems. The review suggests that bone hormones modulate kidney and parathyroid functions. The interaction with vitamin D and phosphates is a key finding. The authors propose that bone hormones have systemic effects beyond bone remodeling. This synthesis supports the need for further exploration of these hormonal pathways.