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Hysteresis and calcium set-point for the calcium parathyroid hormone relationship in healthy horses.

Abstract：

:Abnormalities in calcium (Ca(2+)) homeostasis are reported in horses with several pathological conditions; however, there is little information on Ca(2+) regulation in horses. The objectives of the present study were to determine the Ca(2+) set-point in healthy horses, to determine whether the Ca(2+)/parathyroid hormone (PTH) response curves were characterized by hysteresis, and to determine if the order of experimentally induced hypocalcemia or hypercalcemia had an effect on PTH secretion. The Ca(2+) set-point and hysteresis were determined in 12 healthy horses by infusing Na(2)EDTA and calcium gluconate. The Ca(2+) set-point was 1.37 +/- 0.05 mmol/L, which is higher than values reported for humans and dogs (1.0-1.2 mmol/L). Hysteresis was present during hypocalcemia and hypercalcemia. Horses in which hypocalcemia was followed by hypercalcemia secreted more PTH (7440 +/- 740 pmol min/L) than horses in which hypercalcemia was followed by hypocalcemia (5990 +/- 570 pmol min/L). This study has demonstrated that the Ca(2+) set-point in the horse is higher than in other domestic animals and man. We have shown that the Ca(2+)/PTH relationship in horses is sigmoidal and displays hysteresis during both hypocalcemia and hypercalcemia, and that extracellular Ca(2+) concentrations may affect the response of the parathyroid gland to hypocalcemia.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Toribio RE,Kohn CW,Sams RA,Capen CC,Rosol TJ

doi

10.1016/s0016-6480(02)00621-4

keywords:

subject

Has Abstract

pub_date

2003-02-15 00:00:00

pages

279-88

issue

3

eissn

0016-6480

issn

1095-6840

pii

S0016648002006214

journal_volume

130

pub_type

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