Details

Autor(en) / Beteiligte

• ZUCKER, T.-P
• BÖNISCH, D
• HASSE, A
• GROSSER, T
• WEBER, A.-A
• SCHRÖR, K

Titel

Tolerance development to antimitogenic actions of prostacyclin but not of prostaglandin E1 in coronary artery smooth muscle cells

Ist Teil von

• European journal of pharmacology, 1998-03, Vol.345 (2), p.213-220

Ort / Verlag

Amsterdam: Elsevier

Erscheinungsjahr

1998

Quelle

Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)

Beschreibungen/Notizen

• This study compares the antimitogenic effects of iloprost and prostaglandin E1 on platelet-derived growth factor-BB stimulated DNA synthesis ([3H]thymidine incorporation) in bovine coronary artery smooth muscle cells. When added 20-24 h after stimulation with platelet-derived growth factor-BB (20 ng/ml), both iloprost and prostaglandin E1, concentration-dependently (IC50 3-5 nM) inhibited DNA synthesis. However, when added together with the growth factor (0-24 h), the inhibition of DNA synthesis by iloprost was markedly attenuated, indicating tolerance development. In contrast, no tolerance to antimitogenic effects of prostaglandin E1 or forskolin were observed. When added to iloprost-tolerant cells, both prostaglandin E1 and forskolin, still inhibited DNA synthesis. There was no evidence for transcriptional down-regulation of prostacyclin receptor gene by iloprost. The data demonstrate a tolerance development to antimitogenic actions of prostacyclin but not of prostaglandin E1 and suggest that the receptors, mediating the antiproliferative actions of these prostaglandins, may be different.