Clin Osteol 2007; 12(3): 107-111
Calcitonin and regulation of osteoclastic bone resorptionReview articles
The calcitonin (CT) gene encodes two polypeptides, CT and a-CT gene-related peptide (aCGRP). CT, a 32-amino-acid-long peptide produced by thyroid C cells, directly inhibits osteoclast function through a high-affinity CT receptor. It is well known that CT levels rise during periods of calcium stress, such as pregnancy, growth, and lactation. The CT/aCGRP-null mouse confirmed that CT pro tects the maternal skeleton during lactation, at least in mice. Subjects with CT deficiency as well as CT/aCGRP-null animals were mo re responsive to PTH- or vitamin D-induced stimulation. Moreover, the deficiency of CT in the CT/aCGRP-null mouse does result in increased bone resorption with age. However, there is conflicting evidence whether reduced CT secretion with age may contribute to higher bone resorption in humans. In addition, the CT/aCGRP-null mouse showed high bone mass, likely resulting from the central effect of aCGRP. An alternative possibility is that a subtle change in osteoclast function might contribute to preserved bone mass. Ex tracellular Ca2+ is a physiologically relevant, direct inhibitor of osteoclastic bone resorption. In vitro studies have shown that CT inhi bits Ca2+ sensing. On the other hand, CT loss may enhance Ca2+ sensitivity and therefore preserve bone mass.
Keywords: calcitonin, a -calcitonin gene-related peptide, osteoclasts, bone resorption
Published: December 11, 2007 Show citation
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