Protective effect of thyroxine but not parathyroidectomy on gentamicin nephrotoxicity

R. E. Cronin, J. A. Newman

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Gentamicin nephrotoxicity increases renal cortex calcium and sodium and decreases renal cortex Na-K-ATPase activity. Human acute renal failure is accompanied by an increase in parathyroid hormone (PTH), a hormone that stimulates calcium uptake by tissues, and by a decrease in thyroid hormone, a hormone that increases renal cortex Na-K-ATPase activity. This study evaluated the role of extracellular calcium, PTH, and thyroxine in the pathogenesis of gentamicin nephrotoxicity. Chronically parathyroidectomized hypocalcemic rats (PTXG) given gentamicin (30 mg/kg s.c. twice daily for 8 days) were not protected from renal failure when compared with intact rats given gentamicin (NG), serum creatinine being 4.4 ± 1.0 and 3.7 ± 0.7 mg/dl, respectively, compared with normals (N), 1.2 ± 0.1 mg/dl. Rats given thyroxine (10 μg/100 g body wt for 10 days) before and during gentamicin (PTXT4G) had a serum creatinine not significantly different from normals, 2.1 ± 0.4 mg/dl. Plasma T4 was reduced in PTXG, NG, and PTXT4G compared with N, but the value for PTXT4G was significantly higher than for either PTXG or NG. Renal cortex Na-K-ATPase activity (μmol P(i) · mg prot-1 · h-1) was lower in PTXG (2.3 ± 0.2) and NG (2.4 ± 0.5) compared with N (3.7 ± 0.1), but activity was not reduced in PTXT4G (3.2 ± 0.2). Thyroxine was protective also against gentamicin nephrotoxicity in intact rats. Clearance and excretion studies indicated that this protection did not result from an increase in glomerular filtration rate, filtered load of calcium, or urinary calcium excretion. The direct correlation between renal cortex Na-K-ATPase activity and total plasma T4 (r = 0.6, P < 0.001) suggests that a direct membrane effect of thyroxine may be involved in protection.

Original languageEnglish (US)
Title of host publicationAmerican Journal of Physiology - Renal Fluid and Electrolyte Physiology
Volume17
Edition3
StatePublished - 1985

Fingerprint

Parathyroidectomy
Gentamicins
Thyroxine
Calcium
Kidney
Parathyroid Hormone
Creatinine
Hormones
Serum
Glomerular Filtration Rate
Thyroid Hormones
Acute Kidney Injury
Renal Insufficiency
Sodium
Membranes
sodium-translocating ATPase

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Cronin, R. E., & Newman, J. A. (1985). Protective effect of thyroxine but not parathyroidectomy on gentamicin nephrotoxicity. In American Journal of Physiology - Renal Fluid and Electrolyte Physiology (3 ed., Vol. 17)

Protective effect of thyroxine but not parathyroidectomy on gentamicin nephrotoxicity. / Cronin, R. E.; Newman, J. A.

American Journal of Physiology - Renal Fluid and Electrolyte Physiology. Vol. 17 3. ed. 1985.

Research output: Chapter in Book/Report/Conference proceedingChapter

Cronin, RE & Newman, JA 1985, Protective effect of thyroxine but not parathyroidectomy on gentamicin nephrotoxicity. in American Journal of Physiology - Renal Fluid and Electrolyte Physiology. 3 edn, vol. 17.
Cronin RE, Newman JA. Protective effect of thyroxine but not parathyroidectomy on gentamicin nephrotoxicity. In American Journal of Physiology - Renal Fluid and Electrolyte Physiology. 3 ed. Vol. 17. 1985
Cronin, R. E. ; Newman, J. A. / Protective effect of thyroxine but not parathyroidectomy on gentamicin nephrotoxicity. American Journal of Physiology - Renal Fluid and Electrolyte Physiology. Vol. 17 3. ed. 1985.
@inbook{0dc2bb003dad437f82987484e36c2962,
title = "Protective effect of thyroxine but not parathyroidectomy on gentamicin nephrotoxicity",
abstract = "Gentamicin nephrotoxicity increases renal cortex calcium and sodium and decreases renal cortex Na-K-ATPase activity. Human acute renal failure is accompanied by an increase in parathyroid hormone (PTH), a hormone that stimulates calcium uptake by tissues, and by a decrease in thyroid hormone, a hormone that increases renal cortex Na-K-ATPase activity. This study evaluated the role of extracellular calcium, PTH, and thyroxine in the pathogenesis of gentamicin nephrotoxicity. Chronically parathyroidectomized hypocalcemic rats (PTXG) given gentamicin (30 mg/kg s.c. twice daily for 8 days) were not protected from renal failure when compared with intact rats given gentamicin (NG), serum creatinine being 4.4 ± 1.0 and 3.7 ± 0.7 mg/dl, respectively, compared with normals (N), 1.2 ± 0.1 mg/dl. Rats given thyroxine (10 μg/100 g body wt for 10 days) before and during gentamicin (PTXT4G) had a serum creatinine not significantly different from normals, 2.1 ± 0.4 mg/dl. Plasma T4 was reduced in PTXG, NG, and PTXT4G compared with N, but the value for PTXT4G was significantly higher than for either PTXG or NG. Renal cortex Na-K-ATPase activity (μmol P(i) · mg prot-1 · h-1) was lower in PTXG (2.3 ± 0.2) and NG (2.4 ± 0.5) compared with N (3.7 ± 0.1), but activity was not reduced in PTXT4G (3.2 ± 0.2). Thyroxine was protective also against gentamicin nephrotoxicity in intact rats. Clearance and excretion studies indicated that this protection did not result from an increase in glomerular filtration rate, filtered load of calcium, or urinary calcium excretion. The direct correlation between renal cortex Na-K-ATPase activity and total plasma T4 (r = 0.6, P < 0.001) suggests that a direct membrane effect of thyroxine may be involved in protection.",
author = "Cronin, {R. E.} and Newman, {J. A.}",
year = "1985",
language = "English (US)",
volume = "17",
booktitle = "American Journal of Physiology - Renal Fluid and Electrolyte Physiology",
edition = "3",

}

TY - CHAP

T1 - Protective effect of thyroxine but not parathyroidectomy on gentamicin nephrotoxicity

AU - Cronin, R. E.

AU - Newman, J. A.

PY - 1985

Y1 - 1985

N2 - Gentamicin nephrotoxicity increases renal cortex calcium and sodium and decreases renal cortex Na-K-ATPase activity. Human acute renal failure is accompanied by an increase in parathyroid hormone (PTH), a hormone that stimulates calcium uptake by tissues, and by a decrease in thyroid hormone, a hormone that increases renal cortex Na-K-ATPase activity. This study evaluated the role of extracellular calcium, PTH, and thyroxine in the pathogenesis of gentamicin nephrotoxicity. Chronically parathyroidectomized hypocalcemic rats (PTXG) given gentamicin (30 mg/kg s.c. twice daily for 8 days) were not protected from renal failure when compared with intact rats given gentamicin (NG), serum creatinine being 4.4 ± 1.0 and 3.7 ± 0.7 mg/dl, respectively, compared with normals (N), 1.2 ± 0.1 mg/dl. Rats given thyroxine (10 μg/100 g body wt for 10 days) before and during gentamicin (PTXT4G) had a serum creatinine not significantly different from normals, 2.1 ± 0.4 mg/dl. Plasma T4 was reduced in PTXG, NG, and PTXT4G compared with N, but the value for PTXT4G was significantly higher than for either PTXG or NG. Renal cortex Na-K-ATPase activity (μmol P(i) · mg prot-1 · h-1) was lower in PTXG (2.3 ± 0.2) and NG (2.4 ± 0.5) compared with N (3.7 ± 0.1), but activity was not reduced in PTXT4G (3.2 ± 0.2). Thyroxine was protective also against gentamicin nephrotoxicity in intact rats. Clearance and excretion studies indicated that this protection did not result from an increase in glomerular filtration rate, filtered load of calcium, or urinary calcium excretion. The direct correlation between renal cortex Na-K-ATPase activity and total plasma T4 (r = 0.6, P < 0.001) suggests that a direct membrane effect of thyroxine may be involved in protection.

AB - Gentamicin nephrotoxicity increases renal cortex calcium and sodium and decreases renal cortex Na-K-ATPase activity. Human acute renal failure is accompanied by an increase in parathyroid hormone (PTH), a hormone that stimulates calcium uptake by tissues, and by a decrease in thyroid hormone, a hormone that increases renal cortex Na-K-ATPase activity. This study evaluated the role of extracellular calcium, PTH, and thyroxine in the pathogenesis of gentamicin nephrotoxicity. Chronically parathyroidectomized hypocalcemic rats (PTXG) given gentamicin (30 mg/kg s.c. twice daily for 8 days) were not protected from renal failure when compared with intact rats given gentamicin (NG), serum creatinine being 4.4 ± 1.0 and 3.7 ± 0.7 mg/dl, respectively, compared with normals (N), 1.2 ± 0.1 mg/dl. Rats given thyroxine (10 μg/100 g body wt for 10 days) before and during gentamicin (PTXT4G) had a serum creatinine not significantly different from normals, 2.1 ± 0.4 mg/dl. Plasma T4 was reduced in PTXG, NG, and PTXT4G compared with N, but the value for PTXT4G was significantly higher than for either PTXG or NG. Renal cortex Na-K-ATPase activity (μmol P(i) · mg prot-1 · h-1) was lower in PTXG (2.3 ± 0.2) and NG (2.4 ± 0.5) compared with N (3.7 ± 0.1), but activity was not reduced in PTXT4G (3.2 ± 0.2). Thyroxine was protective also against gentamicin nephrotoxicity in intact rats. Clearance and excretion studies indicated that this protection did not result from an increase in glomerular filtration rate, filtered load of calcium, or urinary calcium excretion. The direct correlation between renal cortex Na-K-ATPase activity and total plasma T4 (r = 0.6, P < 0.001) suggests that a direct membrane effect of thyroxine may be involved in protection.

UR - http://www.scopus.com/inward/record.url?scp=0021993052&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0021993052&partnerID=8YFLogxK

M3 - Chapter

VL - 17

BT - American Journal of Physiology - Renal Fluid and Electrolyte Physiology

ER -