Interleukin-6 promotes human epidermal keratinocyte proliferation and keratin cytoskeleton reorganization in culture.
We have studied the effects of interleukin-6 (IL-6) on human epidermal keratinocytes by using serum-free culture conditions that allow the serial transfer, differentiation, and formation of well-organized multilayered epithelia. IL-6 at 2.5 ng/ml or higher concentrations promoted keratinocyte proliferation, with an ED(50) of about 15 ng/ml and a maximum effect at 50 ng/ml. IL-6 was 10-fold less potent than epidermal growth factor (EGF) or transforming growth factor-alpha (TGF-alpha) and supported keratinocyte growth for up to eight cumulative cell generations. IL-6-treated keratinocytes formed highly stratified colonies with a narrower proliferative/migratory rim than those keratinocytes stimulated with EGF or TGF-alpha; confluent epithelial sheets treated with IL-6 also underwent an increase in the number of cell layers. We also examined the effect of IL-6 on the keratin cytoskeleton. Immunostaining with anti-K16 monoclonal antibodies showed that the keratin network was aggregated and reorganized around cell nucleus and that this was not attributable to changes in keratin levels. This is the first report concerning the induction of the reorganization of keratin intermediate filaments by IL-6 in human epidermal keratinocytes.
Department of Cell Biology, Centro de Investigación y de Estudios Avanzados del IPN, Apdo. Postal 14-740, México 07000, Mexico.
Miriam
M
Hernández-Quintero
Walid
W
Kuri-Harcuch
Arturo
A
González Robles
Federico
F
Castro-Muñozledo
D000911:Antibodies, Monoclonal / Q000378:metabolism; D018929:Cell Culture Techniques; D002455:Cell Division / Q000187:drug effects*; D002478:Cells, Cultured; D016895:Culture Media, Serum-Free; D004305:Dose-Response Relationship, Drug; D000078404:Epidermal Cells; D004815:Epidermal Growth Factor / Q000494:pharmacology; D006801:Humans; D007150:Immunohistochemistry; D015850:Interleukin-6 / Q000494:pharmacology*; D015603:Keratinocytes / Q000187:drug effects* / Q000502:physiology* / Q000648:ultrastructure; D007633:Keratins / Q000378:metabolism* / Q000648:ultrastructure; D016211:Transforming Growth Factor alpha / Q000494:pharmacology
D000911:Antibodies, Monoclonal; D016895:Culture Media, Serum-Free; D015850:Interleukin-6; D016211:Transforming Growth Factor alpha; D004815:Epidermal Growth Factor; D007633:Keratins