Parathyroid Hormone-Related Protein (PTHrP)
Hormonal Regulation of Calcium, Phosphate and Bone
Parathyroid Hormone-Related Protein (PTHrP)
PTHrP shares receptor-related actions with PTH but has broad local developmental and tissue roles.
Three organs in communication
Calcium and phosphate regulation coordinates intestine, kidney and bone through PTH, vitamin D-related signals and FGF23. Ionized calcium, renal function and tissue responsiveness influence the pattern. Serum concentration alone does not measure skeletal mineral stores.
Specific considerations
Excess systemic production can contribute to malignancy-associated hypercalcemia.
Bone under load
Mechanical loading supplies local signals that interact with endocrine state, adequate energy and nutrient availability. A circulating bone marker can reflect several skeletal sites and does not independently prove stronger bone or predict fracture risk.
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