The cellular effects of a unique pesticide sulfluramid (N-ethylperfluorooctane sulphonamide) on rabbit renal proximal tubules

R. G. Schnellmann

doi:10.1016/0887-2333(90)90012-I

The cellular effects of a unique pesticide sulfluramid (N-ethylperfluorooctane sulphonamide) on rabbit renal proximal tubules

R. G. Schnellmann

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

The cellular effects of sulfluramid (N-ethylperfluorooctane sulphonamide, NEPFOS) and its major metabolite perfluorooctane sulphonamide (PFOS) were examined using a suspension of rabbit renal proximal tubules as a model. NEPFOS and PFOS were potent stimulators of proximal tubule basal oxygen consumption (QO₂), with initial effects exhibited at 5-10 μm and maximal effects at 50-200 μm. The increase in basal QO₂ was ouabain insensitive, which suggests that NEPFOS and PFOS may act by uncoupling oxidative phosphorylation. Exposure of tubule suspensions to NEPFOS or PFOS concentrations of 100 μm or higher for 60 min produced tubule death, indicated by an increase in the release of lactate dehydrogenase. The tubule death did not appear to result from alkylation or lipid peroxidation, since glutathione and malondialdehyde levels were unaffected. To determine the mechanism by which NEPFOS and PFOS increased tubule QO₂, the effects of NEPFOS and PFOS on isolated renal cortical mitochondria were examined. NEPFOS (10 μm) and PFOS (5 μm) increased state-4 respiration of mitochondria in the absence of a phosphate acceptor. These results suggest that NEPFOS and PFOS uncouple oxidative phosphorylation and may produce cytotoxicity through this mechanism.

Original language	English (US)
Pages (from-to)	71-74
Number of pages	4
Journal	Toxicology in Vitro
Volume	4
Issue number	1
DOIs	https://doi.org/10.1016/0887-2333(90)90012-I
State	Published - 1990
Externally published	Yes

ASJC Scopus subject areas

Toxicology

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10.1016/0887-2333(90)90012-I

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title = "The cellular effects of a unique pesticide sulfluramid (N-ethylperfluorooctane sulphonamide) on rabbit renal proximal tubules",

abstract = "The cellular effects of sulfluramid (N-ethylperfluorooctane sulphonamide, NEPFOS) and its major metabolite perfluorooctane sulphonamide (PFOS) were examined using a suspension of rabbit renal proximal tubules as a model. NEPFOS and PFOS were potent stimulators of proximal tubule basal oxygen consumption (QO2), with initial effects exhibited at 5-10 μm and maximal effects at 50-200 μm. The increase in basal QO2 was ouabain insensitive, which suggests that NEPFOS and PFOS may act by uncoupling oxidative phosphorylation. Exposure of tubule suspensions to NEPFOS or PFOS concentrations of 100 μm or higher for 60 min produced tubule death, indicated by an increase in the release of lactate dehydrogenase. The tubule death did not appear to result from alkylation or lipid peroxidation, since glutathione and malondialdehyde levels were unaffected. To determine the mechanism by which NEPFOS and PFOS increased tubule QO2, the effects of NEPFOS and PFOS on isolated renal cortical mitochondria were examined. NEPFOS (10 μm) and PFOS (5 μm) increased state-4 respiration of mitochondria in the absence of a phosphate acceptor. These results suggest that NEPFOS and PFOS uncouple oxidative phosphorylation and may produce cytotoxicity through this mechanism.",

author = "Schnellmann, {R. G.}",

note = "Funding Information: Acknowledgements-I thank Dr Dwight B. Coulter for his comments, Scott A. Hall and Aparna H. Desai for their excellent technical assistance, and Joanne Foster for her help in processing the manuscript. This work was supported by a grant from the Veterinary Medical Experiment Station, University of Georgia. Dr R. G. Schnellmann is a recipient of a PMA Foundation Faculty Development Award.",

year = "1990",

doi = "10.1016/0887-2333(90)90012-I",

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AU - Schnellmann, R. G.

N1 - Funding Information: Acknowledgements-I thank Dr Dwight B. Coulter for his comments, Scott A. Hall and Aparna H. Desai for their excellent technical assistance, and Joanne Foster for her help in processing the manuscript. This work was supported by a grant from the Veterinary Medical Experiment Station, University of Georgia. Dr R. G. Schnellmann is a recipient of a PMA Foundation Faculty Development Award.

PY - 1990

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N2 - The cellular effects of sulfluramid (N-ethylperfluorooctane sulphonamide, NEPFOS) and its major metabolite perfluorooctane sulphonamide (PFOS) were examined using a suspension of rabbit renal proximal tubules as a model. NEPFOS and PFOS were potent stimulators of proximal tubule basal oxygen consumption (QO2), with initial effects exhibited at 5-10 μm and maximal effects at 50-200 μm. The increase in basal QO2 was ouabain insensitive, which suggests that NEPFOS and PFOS may act by uncoupling oxidative phosphorylation. Exposure of tubule suspensions to NEPFOS or PFOS concentrations of 100 μm or higher for 60 min produced tubule death, indicated by an increase in the release of lactate dehydrogenase. The tubule death did not appear to result from alkylation or lipid peroxidation, since glutathione and malondialdehyde levels were unaffected. To determine the mechanism by which NEPFOS and PFOS increased tubule QO2, the effects of NEPFOS and PFOS on isolated renal cortical mitochondria were examined. NEPFOS (10 μm) and PFOS (5 μm) increased state-4 respiration of mitochondria in the absence of a phosphate acceptor. These results suggest that NEPFOS and PFOS uncouple oxidative phosphorylation and may produce cytotoxicity through this mechanism.

AB - The cellular effects of sulfluramid (N-ethylperfluorooctane sulphonamide, NEPFOS) and its major metabolite perfluorooctane sulphonamide (PFOS) were examined using a suspension of rabbit renal proximal tubules as a model. NEPFOS and PFOS were potent stimulators of proximal tubule basal oxygen consumption (QO2), with initial effects exhibited at 5-10 μm and maximal effects at 50-200 μm. The increase in basal QO2 was ouabain insensitive, which suggests that NEPFOS and PFOS may act by uncoupling oxidative phosphorylation. Exposure of tubule suspensions to NEPFOS or PFOS concentrations of 100 μm or higher for 60 min produced tubule death, indicated by an increase in the release of lactate dehydrogenase. The tubule death did not appear to result from alkylation or lipid peroxidation, since glutathione and malondialdehyde levels were unaffected. To determine the mechanism by which NEPFOS and PFOS increased tubule QO2, the effects of NEPFOS and PFOS on isolated renal cortical mitochondria were examined. NEPFOS (10 μm) and PFOS (5 μm) increased state-4 respiration of mitochondria in the absence of a phosphate acceptor. These results suggest that NEPFOS and PFOS uncouple oxidative phosphorylation and may produce cytotoxicity through this mechanism.

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The cellular effects of a unique pesticide sulfluramid (N-ethylperfluorooctane sulphonamide) on rabbit renal proximal tubules

Abstract

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