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

In Vitro Cellular & Developmental Biology - Animal volume 34, pages 824–830 (1998)Cite this article

Summary

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.

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Affiliations

  1. Department of Pediatrics, Indiana University Medical Center, 46202, Indianapolis, Indiana

    Sharon P. Andreoli & Coleen P. Mallett

  2. Department of Anatomy, Indiana University Medical Center, 46202, Indianapolis, Indiana

    James A. McAteer

  3. Department of Physiology, Indiana University Medical Center, 46202, Indianapolis, Indiana

    Stephen A. Kempson

  4. Department of Medicine, Indiana University Medical Center, 46202, Indianapolis, Indiana

    Naomi Fineberg

Authors
  1. Sharon P. Andreoli
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  2. Coleen P. Mallett
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  4. Stephen A. Kempson
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  5. Naomi Fineberg
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Andreoli, S.P., Mallett, C.P., McAteer, J.A. et al. Epidermal growth factor accelerates recovery of LLC-PK1 cells following oxidant injury. In Vitro Cell.Dev.Biol.-Animal 34, 824–830 (1998). https://doi.org/10.1007/s11626-998-0037-6

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  • DOI: https://doi.org/10.1007/s11626-998-0037-6

Key words

  • oxidant injury
  • hydrogen peroxide
  • EGF
  • ATP
  • Na+K+ ATPase