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pubmed-article:2266122pubmed:abstractTextMature, confluent monolayer cultures of IEC-6 rat intestinal epithelial cells in conventional growth media express both Na(+)-linked, concentrative nucleoside transport (NT) activity and equilibrative, inhibitor-sensitive NT activity, but do not show morphologic differentiation. Na(+)-dependent fluxes of Ado and formycin B were minor in early subconfluent IEC-6 monolayers, but increased severalfold to become the major component of influx of these agents in confluent monolayers grown in medium containing Nu-Serum, a commercial medium supplement with a low serum content. In monolayers cultured in medium with fetal bovine serum, cell proliferation rates were similar to those in medium supplemented with Nu-Serum, but expression of Na(+)-linked NT activity was 6-8-fold lower than in monolayers grown in the latter medium. Inclusion of hydrocortisone in growth medium with Nu-Serum caused a 2-fold increase in the expression of Na(+)-linked NT activity. Experiments in which components of medium supplementation were withheld showed that insulin and epidermal growth factor were important in expression of the Na(+)-linked NT activity. Because the Na(+)-linked NT system has a brush border location in fresh intestinal epithelium, it is concluded that the regulated expression of this activity in the IEC-6 monolayers is a differentiative change.lld:pubmed
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pubmed-article:2266122pubmed:articleTitleExpression of sodium-linked nucleoside transport activity in monolayer cultures of IEC-6 intestinal epithelial cells.lld:pubmed
pubmed-article:2266122pubmed:affiliationMcEachern Laboratory, University of Alberta, Edmonton, Canada.lld:pubmed
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