Display options
Cite
Segre BV, D'Amour P, Potts JT. Metabolism of radioiodinated bovine parathyroid hormone in the rat. Endocrinology. 1976;99(6):1645-52doi: 10.1210/endo-99-6-1645.
Segre, B. V., D'Amour, P., & Potts, J. T. (1976). Metabolism of radioiodinated bovine parathyroid hormone in the rat. Endocrinology, 99(6), 1645-52. https://doi.org/10.1210/endo-99-6-1645
Segre, B V, et al. "Metabolism of radioiodinated bovine parathyroid hormone in the rat." Endocrinology vol. 99,6 (1976): 1645-52. doi: https://doi.org/10.1210/endo-99-6-1645
Segre BV, D'Amour P, Potts JT. Metabolism of radioiodinated bovine parathyroid hormone in the rat. Endocrinology. 1976 Dec;99(6):1645-52. doi: 10.1210/endo-99-6-1645. PMID: 1001258.
Copy Download .nbib Format: NLM
Share it on
Full text links
Silverchair Information Systems

Endocrinology. 1976 Dec;99(6):1645-52. doi: 10.1210/endo-99-6-1645.

Metabolism of radioiodinated bovine parathyroid hormone in the rat.

Endocrinology

B V Segre, P D'Amour, J T Potts

PMID: 1001258 DOI: 10.1210/endo-99-6-1645

Abstract

Metabolism of bovine 125I-labeled parathyroid hormone was studied in the rat by gel filtration and by sequence analysis of the iodinated fragments. Analysis of the kinetics of hormone metabolism shows that iodinated intact hormone has a multiexponential disappearance curve with a rapid (3 min) initial and a slower (48 min) second component. Iodinated fragments, which rapidly increase during the first 12 min after injection of the intact hormone, subsequently disappear from the circulation with a t1/2 of no greater than 48 min. Plasma samples collected at various time-intervals after intravenous injection of bovine 125I-labeled parathyroid hormone were gel filtered on Bio-gel P-100. Four radioactive peaks were seen. The first and second peaks eluted, respectively, at the void volume of the column and at the position of intact hormone. The third peak consisted of iodinated fragments, and the last peak eluted at the salt volume of the column. Sequence analysis of the iodinated fragments in the third peak showed that it was heterogeneous, containing several different, but closely related, polypeptides. Before 48 min after injection, the most-abundant fragment is one whose amino-terminal amino acid is residue 34. The amino-terminal residue of the next most-common fragment is the amino acid at position 37. No fragments representing cleavages closer to the amino-terminus than residue 34 were seen. The results of these studies are virtually identical with those previously obtained in the dog. The similarities found in the sites of hormone proteolysis and in the kinetics of hormone metabolism in the rat and dog, coupled with the less direct evidence indicating that similar cleavages are also present in man and bovine, are consistent with the view that proteolysis of parathyroid hormone is peripheral tissues is specific, at least in mammalian species, and may be a critical step in controlling the availability of biologically active hormone.

Similar articles

Santomé JA, Dellacha JM, Paladini AC, Wolfenstein CE, Peña C, Poskus E, Daurat ST, Biscoglio MJ, de Sesé ZM, de Sangüesa AV.
FEBS Lett. 1971 Aug 15;16(3):198-200. doi: 10.1016/0014-5793(71)80132-1.
PMID: 11945939

Cited by

Substances

MeSH terms

Publication Types

LinkOut - more resources