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. 1995 May;115(2):361–367. doi: 10.1111/j.1476-5381.1995.tb15886.x

Stimulation of two vascular smooth muscle-derived cell lines by angiotensin II: differential second messenger responses leading to mitogenesis.

C Morton 1, R Baines 1, I Masood 1, L Ng 1, M R Boarder 1
PMCID: PMC1908324  PMID: 7670738

Abstract

1. We show here that angiotensin II (AII) and endothelin-1 (ET-1) stimulate [3H]-thymidine incorporation in a smooth muscle cell line derived from aortae of spontaneously hypertensive rats (SHR), but not in cells derived from normotensive controls (WKY). We have used the differential response of the two cell lines to investigate the relationship between second messenger systems and the mitogenic response. 2. AII produced an increase in accumulation of inositol 1,4,5-triphosphate which was greater in the SHR-derived cell line than in the WKY cells. 3. AII gave an increase in cytosolic Ca2+ in each of the cell lines, with both a larger peak (15-30 s) and plateau response (2 min) in the SHR cells. ET-1 gave an enhanced response in the SHR-derived cells with respect to the peak but not the plateau of cytosolic Ca2+. 4. Phospholipase D activity was studied by monitoring the formation of [3P]-phosphatidylbutanol in 32Pi prelabelled cells. AII stimulation gave a larger phospholipase D response in the SHR-derived cells, while ET-1 gave a larger response in WKY-derived cells. 5. Stimulation of SHR-derived cells with 100 nM AII for 1 h, followed by 19 h in the absence of agonist, stimulated [3H]-thymidine incorporation over the next 4 h. When the 1 h stimulation with AII was in the presence of increasing concentrations of butanol, which diverts the product of the phospholipase D pathway, there was a loss of stimulated [3H]-thymidine incorporation which was significant at 10 mM butanol and at 30-50 mM reached a maximum loss of 40%.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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