Calcitonin, an important factor in the calcemic response to parathyroid hormone in the rat.

Abstract:

:The role of calcitonin on the calcemic response to parathyroid hormone (PTH) in renal failure has not been evaluated previously. Often animal studies evaluating the calcemic response to PTH in renal failure are performed in thyroparathyroidectomized (TPTX) animals, and thus eliminate any potential physiologic effect of calcitonin. In addition, parathyroidectomy (PTX), presumably by reduction of high PTH levels, has corrected the calcemic response to PTH in animals with renal failure. The present study was designed to evaluate the effect of endogenous calcitonin production on the calcemic response to PTH in rats with renal failure and secondary hyperparathyroidism, and in rats with normal renal function with diet induced hyperparathyroidism. Four groups of rats were evaluated: 1) chronic renal failure plus TPTX with autotransplant of the parathyroid gland, (CT-) CRF; 2) chronic renal failure plus selective PTX with autotransplant of the parathyroid gland, (CT+) CRF; 3) normal renal function plus TPTX with autotransplant of the parathyroid gland, (CT-) NRF; and 4) normal renal function plus selective PTX with autotransplant of the parathyroid gland, (CT+) NRF. Renal failure was surgically induced by a two-stage 5/6 nephrectomy, and exogenous thyroxine was administered to the two thyroidectomized (CT-) groups. Hyperparathyroidism was induced with a high phosphate diet (1.2%), and thus at the time of PTH infusion, PTH levels were (CT-) CRF 84 +/- 16, (CT+) CRF 89 +/- 21, (CT-) NRF 37 +/- 7, and (CT+) NRF 31 +/- 4 pg/ml, respectively (normal 21 +/- 3 pg/ml). Rat 1-34 PTH (2.6 U/hr) was infused for 48 hours via a subcutaneously implanted Alzet pump.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Kidney Int

journal_title

Kidney international

authors

Rodriguez M,Felsenfeld AJ,Torres A,Pederson L,Llach F

doi

10.1038/ki.1991.203

subject

Has Abstract

pub_date

1991-08-01 00:00:00

pages

219-25

issue

2

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)57293-1

journal_volume

40

pub_type

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