PARTIAL HYDROLYSIS OF BOVINE PARATHYROID HORMONE BY DILUTE ACID AND PROTEOLYTIC ENZYMES: EFFECTS ON IMMUNOLOGICAL AND BIOLOGICAL ACTIVITIES.
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Biomedical subjects
Publications and source records attributed to P L MUNSON.
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A factor that lowers serum calcium and inorganic phosphate in rats has been purified 500-fold from 0.1N HCl extracts of hog thyroid glands. It is distinct from thyroxine and triiodothyronine and appears to be a polypeptide.
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1. Immunochemical cross-reactivity, but not identity, has been demonstrated between bovine parathyroid hormone and an antigen in biologically active extracts of human parathyroid tissue by quantitative C' fixation and C' fixation inhibition. 2. An antigen that fixes C' with rabbit antibody to bovine parathyroid hormone has been found in urea extracts of six human non-parathyroid neoplasms associated with a hypercalcemic syndrome mimicking primary hyperparathyroidism. Comparable extracts of control tissues and other tumors were serologically negative. 3. It is concluded that the tumor antigen is parathyroid hormone or a very closely related protein, and that its production by these neoplasms was the cause of the hypercalcemic syndrome in these six patients.
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