Migration of human keratinocytes in electric fields requires growth factors and extracellular calcium

K. S. Fang, B. Farboud, R. Nuccitelli, Roslyn Rivkah Isseroff

Research output: Contribution to journalArticle

80 Scopus citations

Abstract

Currents that leak out of wounds generate electric fields lateral to the wound. These fields induce directional locomotion of human keratinocytes in vitro and may promote wound healing in vivo. We have examined the effects of growth factors and calcium, normally present in culture medium and the wound fluid, on the directional migration of human keratinocytes in culture. In electric fields of physiologic strength (100 mV per ram), keratinocytes migrated directionally towards the cathode at a rate of about 1 μm per min. This directional migration requires several growth factors. In the absence of these growth factors, the cell migration rate decreased but directionality was maintained. Epidermal growth factor alone restored cell migration rates at concentrations as low as 0.2 ng per ml. Insulin at 5'100 μg per ml or bovine pituitary extract at 0.2%-2% vol/vol also stimulated keratinocyte motility but was not sufficient to fully restore the migration rate. Keratinocyte migration in electric fields requires extracellular calcium. Changes in calcium concentrations from 3 μM to 3.3 mM did not significantly change keratinocyte migration rate nor directionality in electric fields; however, addition of the chelator ethyleneglycol-bis(β-aminoethyl ether)- N,N,N',N'-tetraacetic acid to migration medium reduced, and eventually abolished, keratinocyte motility. Our results show that (i) growth factors and extracellular calcium are required for electric field-induced directional migration of human keratinocytes, and (ii) keratinocytes migrate equally well in low and high calcium media.

Original languageEnglish (US)
Pages (from-to)751-756
Number of pages6
JournalJournal of Investigative Dermatology
Volume111
Issue number5
DOIs
StatePublished - 1998

Keywords

  • Bovine pituitary extract
  • Epidermal growth factor
  • Galvanotaxis
  • Motility
  • Wound current
  • Wound healing

ASJC Scopus subject areas

  • Dermatology

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