Document Detail


Oxygen radicals alter the cell membrane potential in a renal cell line (LLC-PK1) with differentiated characteristics of proximal tubular cells.
MedLine Citation:
PMID:  3801479     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We employed a carbocyanine dye (1,1',3,3,3',3'-hexamethylindocarbocyanine iodide) to measure the plasma membrane potential of LLC-PK1 renal epithelial cells exposed to either xanthine oxidase-generated oxygen radicals or to hydrogen peroxide. Measurements were performed using a fluorescent-activated cell sorter to record fluorescence on a cell by cell basis. Initial exposure of cells to low concentrations of either H2O2 or xanthine oxidase resulted in a transient increase in membrane potential relative to control cells (P less than 0.001), followed by an exponential decline in potential (P less than 0.001). The addition of extracellular catalase diminished the H2O2-related decline in potential, consistent with a role for hydrogen peroxide in producing this effect. Pretreatment of cells with inhibitors of intracellular catalase and superoxide dismutase prior to exposure to xanthine oxidase caused an even larger decline in potential (P less than 0.001). Cells could be partially protected from the radical-mediated loss of potential by incubating them in a hypertonic (400 mosmolal) environment during radical exposure. Similarly, the loss of membrane potential was increased after incubation of cells in a hypotonic (200 mosmolal) environment during radical exposure. These observations are consistent with a reduction in membrane potential effected by exposure to oxygen radicals (including superoxide anion and hydrogen peroxide). This reduction may be prevented, in part, by radical scavenging enzymes and by reducing the degree of cellular swelling in response to oxygen radical exposure.
Authors:
J A Scott; B A Khaw; C J Homcy; C A Rabito
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Biochimica et biophysica acta     Volume:  897     ISSN:  0006-3002     ISO Abbreviation:  Biochim. Biophys. Acta     Publication Date:  1987 Feb 
Date Detail:
Created Date:  1987-03-26     Completed Date:  1987-03-26     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0217513     Medline TA:  Biochim Biophys Acta     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  25-32     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Carbocyanines
Catalase / metabolism
Cell Differentiation
Cell Line
Fluorescent Dyes
Free Radicals*
Hydrogen Peroxide / pharmacology
Hypertonic Solutions / pharmacology
Hypotonic Solutions / pharmacology
Kidney Tubules, Proximal / cytology*,  drug effects,  physiology
Membrane Potentials / drug effects*
Oxygen / pharmacology*
Superoxide Dismutase / metabolism
Xanthine Oxidase / metabolism
Chemical
Reg. No./Substance:
0/Carbocyanines; 0/Fluorescent Dyes; 0/Free Radicals; 0/Hypertonic Solutions; 0/Hypotonic Solutions; 25470-94-4/1,1',3,3,3',3'-hexamethylindocarbocyanine; 7722-84-1/Hydrogen Peroxide; 7782-44-7/Oxygen; EC 1.11.1.6/Catalase; EC 1.15.1.1/Superoxide Dismutase; EC 1.17.3.2/Xanthine Oxidase

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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