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. 1993 Sep;110(1):477–481. doi: 10.1111/j.1476-5381.1993.tb13835.x

Differential effects of B2 receptor antagonists upon bradykinin-stimulated phospholipase C and D in guinea-pig cultured tracheal smooth muscle.

S Pyne 1, N J Pyne 1
PMCID: PMC2175983  PMID: 8220910

Abstract

1. Guinea-pig tracheal smooth muscle cells were isolated and maintained in culture for 14-21 days prior to the study of the effect of a selective bradykinin B1 agonist and B2 antagonists upon bradykinin-stimulated phospholipase C and D activities. 2. Bradykinin-stimulated phospholipase C activity was determined by mass measurement of inositol (1,4,5)trisphosphate (Ins(1,4,5)P3) in unlabelled cells, whereas phospholipase D activity was assayed by the accumulation of [3H]-phosphatidylbutanol ([3H]-PtdBut) in [3H]-palmitate-labelled cells, which were stimulated in the presence of butan-1-o1 (0.3%, v/v). 3. Bradykinin elicited the rapid and transient formation of Ins(1,4,5)P3, in a concentration-dependent manner (log EC50 = -7.55 +/- 0.1 M, N = 3). Bradykinin also rapidly activated the concentration-dependent (log EC50 = -8.3 +/- 0.4 M, n = 3) phospholipase D-catalysed accumulation of [3H]-PtdBut; the accumulation of [3H]-PtdBut was sustained. These effects were not inhibited by pretreatment of the cells with indomethacin (1 microM). 4. The bradykinin B1 agonist, desArg9-bradykinin (1 microM) was without effect upon phospholipase C or phospholipase D activity. Bradykinin-stimulated (10 nM, EC40) Ins(1,4,5)P3 formation was inhibited by B2 receptor antagonists, D-Arg-[Hyp3,D-Phe7]-bradykinin (NPC 567) and D-Arg-[Hyp3,Thi5,8,D-Phe7]-bradykinin (NPC 349), with log IC50 values of -6.3 +/- 0.5 M and -6.3 +/- 0.4 M, respectively. However, bradykinin-stimulated (10 nM, EC100) [3H]-PtdBut accumulation was poorly inhibited and with low potency by each B2 receptor antagonist and bradykinin-stimulated phospholipase D activity persisted at concentrations of antagonist that completely blocked bradykinin-stimulated Ins(1,4,5)P3 formation (30 microM).(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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