Modulation of collagen production by fibroblasts. Effects of chronic exposure to agonists that increase intracellular cyclic AMP

L. E. Saltzman, J. Moss, R. A. Berg, B. Hom, R. G. Crystal

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Cultured human lung fibroblasts were evaluated for their responsiveness to isoprenaline (isoproterenol) or prostaglandin E2 before and after chronic incubation with the agonist. Cells incubated for 6h with either agonist were suppressed in terms of collagen production and exhibited increased intracellular cyclic AMP. Cells incubated for 72h with the agonist and the re-challenged for 6h with the same agonist did not demonstrate suppressed collagen production or increased cyclic AMP. Cells incubated for 72h with isoprenaline still responded to prostaglandin E2 when challenged for 6h; however, when the order of agonist exposure was reversed, cells incubated with prostaglandin E2 did not respond to a challenge by isoprenaline. If cells were allowed to recover for 48h without the agonist after a 72h chronic incubation, they recovered their responsiveness to the agonist. The results indicate that, although cultured fibroblasts may become desensitized to one agonist, they may retain their sensitivity to a second agonist and that chronic suppression of collagen production may be achieved by alternate exposure to isoprenaline and prostaglandin E2.

Original languageEnglish
Pages (from-to)25-30
Number of pages6
JournalUnknown Journal
Issue number1
Publication statusPublished - 1 Jan 1982


ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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