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Regular Article| Volume 88, ISSUE 2, P97-103, February 2000

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Epidermal Growth Factor-Induced Cytoprotection in Human Intestinal Cells Involves Intracellular Calcium Signaling

DOI:https://doi.org/10.1006/jsre.1999.5740
Epidermal Growth Factor-Induced Cytoprotection in Human Intestinal Cells Involves Intracellular Calcium Signaling
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      Abstract

      Background. The mechanism(s) whereby epidermal growth factor (EGF) protects against cellular injury remains poorly understood. Previous data in our laboratory have suggested that EGF-induced cellular proliferation in human colonic carcinoma cells (Caco-2) may involve changes in intracellular calcium content ([Ca2+]i). Our current objective was to determine if a similar process was involved with EGF-induced cytoprotection.
      Methods. Postconfluent Caco-2 cells were employed for all experimentation. [Ca2+]i was measured with Fluo-3 fluorescence. Injury was measured employing Ethidium homodimer 1 uptake and lactate dehydrogenase (LDH) release.
      Results. Caco-2 cells pretreated, but not concomitantly treated, with EGF (10–100 ng/ml, 30–60 min) significantly attenuated cellular injury induced subsequently by 500 μM deoxycholate (DC). Cells exposed to 100 ng/ml EGF demonstrated an initial increase in [Ca2+]i (1–5 min) which was blocked with neomycin, an inhibitor of inositol 1,4,5-trisphosphate (IP3) generation, and the phospholipase C (PLC) inhibitor U73122, but not U73343 (inactive control). This was followed by sustained extracellular Ca2+ influx (5–20 min), which was attenuated with calcium-free buffer and the store operated Ca2+ channel blocker La3+. [Ca2+]i then returned to baseline (20–30 min), a process blocked with the Ca2+-ATPase inhibitors quercetin and vanadate. The above treatments, which in and of themselves did not induce cellular injury, were repeated and cells were subsequently exposed to DC. All groups exposed to 500 μM DC demonstrated significant increases in both Ethidium Homodimer 1 uptake and LDH release. Both indices of injury were significantly decreased when cells were pretreated with EGF ± the inactive PLC inhibitor U73343. However, protection induced by EGF was lost when any of its effects on changes in [Ca2+]i were prevented: internal Ca2+ store release via PLC and IP3, sustained Ca2+ influx through store operated Ca2+ channels, or subsequent Ca2+ efflux.
      Conclusion. Taken together, these data strongly suggest that the cytoprotective effects of EGF may involve Ca2+ signaling.

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      Article info

      Footnotes

      ☆Presented at the 23rd Annual Symposium of the Association of Veterans Administration Surgeons, St. Louis, MO, May 2–4, 1999.

      Identification

      DOI: https://doi.org/10.1006/jsre.1999.5740

      Copyright

      © 2000 Academic Press. Published by Elsevier Inc. All rights reserved.

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