Biphasic effects of exogenous phospholipase D on vessel tone

Chin Chen Chu, Shih Hurng Loh, Ann Chen, Wei Hwa Lee, Jong Shiaw Jin

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

There exists functional significance for agonists stimulated phospholipase D (PLD) and exogenous PLD in different systems, but the functional importance of PLD on vessel tone is not clear. We studied the functional importance of PLD in whole animals and in isolated vessel preparation. In in vivo study, we demonstrated that intravenous injection of PLD at 10,30, and 100 units to male Sprague-Dawley rats did not significantly alter the mean arterial blood pressure and heart rate in 30 minutes. However, in a denuded vessel preparation, PLD from 10 -3 units/ml to 10 units/ml induced vasoconstriction from 2.8 ± 1.7% to 30.5 ± 1.7% of maximal KCl contraction in calcium enriched physiological salt solution (PSS). This vasoconstrictive effects of PLD were significantly inhibited by omission of extracellular calcium from PSS or by pretreatment the vessels with nifedipine (10 -6 M). Pretreated the denuded vessels with a protein kinase C/inhibitor, chelerythrine (10 -6 M), did not significantly alter the vasoconstrictive effects of PLD. These results indicate that calcium channel rather than protein kinase C activation is involved in PLD-induced vasoconstriction. In endothelium-intact vessels, application of PLD from 10 -4 units/ml to 10 units/ml induced endothelium dependent relaxation in vessels precontracted with phenylephrine (10 -6 M). This relaxation effects of PLD were inhibited by pretreatment of vessels with indomethacin (10 -5M) or with N -nitro-L-arginine (L-NAME, 10 -4 M), suggesting prostaglandin and nitric oxide released by PLD stimulation. The biphasic effects of PLD on vessel tone are mediated by extracellular calcium and by endothelium-derived nitric oxide and prostaglandin.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalChinese Journal of Physiology
Volume45
Issue number1
Publication statusPublished - 2002
Externally publishedYes

Fingerprint

Phospholipase D
Vasoconstriction
Calcium
Protein Kinase C
Endothelium
Arterial Pressure
Nitric Oxide
Salts
Protein C Inhibitor
NG-Nitroarginine Methyl Ester
Phenylephrine
Calcium Channels
Nifedipine
Protein Kinase Inhibitors
Intravenous Injections
Indomethacin
Prostaglandins
Sprague Dawley Rats
Arginine

Keywords

  • Nitric oxide
  • Phospholipase D
  • Prostaglandin
  • Protein kinase C
  • Vascular smooth muscle

ASJC Scopus subject areas

  • Physiology

Cite this

Chu, C. C., Loh, S. H., Chen, A., Lee, W. H., & Jin, J. S. (2002). Biphasic effects of exogenous phospholipase D on vessel tone. Chinese Journal of Physiology, 45(1), 1-7.

Biphasic effects of exogenous phospholipase D on vessel tone. / Chu, Chin Chen; Loh, Shih Hurng; Chen, Ann; Lee, Wei Hwa; Jin, Jong Shiaw.

In: Chinese Journal of Physiology, Vol. 45, No. 1, 2002, p. 1-7.

Research output: Contribution to journalArticle

Chu, CC, Loh, SH, Chen, A, Lee, WH & Jin, JS 2002, 'Biphasic effects of exogenous phospholipase D on vessel tone', Chinese Journal of Physiology, vol. 45, no. 1, pp. 1-7.
Chu, Chin Chen ; Loh, Shih Hurng ; Chen, Ann ; Lee, Wei Hwa ; Jin, Jong Shiaw. / Biphasic effects of exogenous phospholipase D on vessel tone. In: Chinese Journal of Physiology. 2002 ; Vol. 45, No. 1. pp. 1-7.
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