Epidermal growth factor accelerates recovery of LLC-PK1 cells following oxidant injury

Sharon P. Andreoli, Coleen P. Mallett, James A. McAteer, Stephen A. Kempson, Naomi Fineberg

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

In renal tubular epithelial cells, oxidant injury results in several metabolic alterations including ATP depletion, decreased Na+K+ ATPase activity, and altered intracellular sodium and potassium content. To investigate the recovery of LLC-PK1 cells following oxidant injury and to determine if recovery can be accelerated, we induced oxidant stress in LLC- PK1 cells with 500 μM hydrogen peroxide for 60 min. Identical cohorts of oxidant-stressed cells were incubated in recovery medium without epidermal growth factor (EGF) or recovery medium containing 25 ng EGF per ml. ATP levels, Na+K+ ATPase activity in whole cells, Na+K+ ATPase activity in disrupted cells, and intracellular sodium and potassium ion content were determined at 0, 5, 24, 48, and 72 h following oxidant injury in each cohort of cells. In oxidant-stressed cells recovering in medium without EGF, ATP levels, Na+K+ ATPase activity, and intracellular ion content improved but continued to remain substantially lower than control values at all time points following oxidant stress. In cells recovering in medium with EGF, ATP levels, Na+K+ATPase activity, and the intracellular potassium-to-sodium ratio were significantly higher at nearly all time points than values in cells recovering in medium alone. In cells recovering with added EGF, Na+K+ ATPase activity had improved to control levels, whereas ATP levels and intracellular ion content approached control values by 72 h following oxidant stress. We conclude that oxidant-mediated ATP depletion, altered Na+K+ ATPase activity, and intracellular ion content remain depressed for several d following oxidant stress and that EGF accelerated recovery of LLC-PK1 cells from oxidant injury.

Original languageEnglish (US)
Pages (from-to)824-830
Number of pages7
JournalIn Vitro Cellular and Developmental Biology - Animal
Volume34
Issue number10
DOIs
StatePublished - Jan 1 1998

Keywords

  • ATP
  • EGF
  • Hydrogen peroxide
  • NaK ATPase
  • Oxidant injury

ASJC Scopus subject areas

  • Developmental Biology
  • Clinical Biochemistry
  • Cell Biology

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