The effect of parathyroid extract infusion was studied in a 17-year-old boy with myositis ossificans progressiva to evaluate its effect on excretion of connective tissue components in extensive ectopic ossification and to explore its therapeutic potential. There was an increase in urinary excretion of hydroxyproline, hexosamine, glycosaminoglycans, and phosphorus, and a decrease in calcium excretion after each infusion. No apparent therapeutic effect was achieved. The hydroxyproline response suggested unusual sensitivity to parathyroid extract, either because of an increased relatively soluble collagen pool or an increased ability to produce hydrolases (collagenase, glycosaminoglycan depolymerases) in response to parathyroid extract stimulus.
Bland JH, Kirschbaum B, O'Connor GT, Whorton E. Myositis Ossificans Progressiva: Effect of Intravenously Given Parathyroid Extract on Urinary Excretion of Connective Tissue Components. Arch Intern Med. 1973;132(2):209–212. doi:10.1001/archinte.1973.03650080053010
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