Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0043167 (pertussis)
 19,595 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

1. Bradykinin caused a transient reduction of about 25% in the cyclic AMP level in forskolin prestimulated DDT1 MF-2 smooth muscle cells (IC50: 36.4 +/- 4.9 nM) and a pronounced, sustained inhibition (40%) of the isoprenaline-stimulated cyclic AMP level (IC50: 37.5 +/- 1.1 nM). 2. The Ca2+ ionophore, ionomycin, mimicked both the bradykinin-induced transient reduction in the forskolin-stimulated cyclic AMP level and the sustained reduction in the isoprenaline-stimulated cyclic AMP level. 3. The Ca(2+)-dependent effect on cyclic AMP induced by bradykinin was mediated solely by Ca2+ release from internal stores, since inhibition of Ca2+ entry with LaCl3 did not reduce the response to bradykinin. 4. The involvement of calmodulin-dependent enzyme activities, protein kinase C or an inhibitory GTP binding protein in the bradykinin-induced responses was excluded since a calmodulin inhibitor, calmidazolium, a PKC inhibitor, staurosporine and pertussis toxin, respectively did not affect the decline in the cyclic AMP level. 5. Bradykinin enhanced the rate of cyclic AMP breakdown in intact cells, which effect was not mimicked by ionomycin. This suggested a Ca(2+)-independent activation of phosphodiesterase activity by bradykinin in DDT1 MF-2 cells. 6. The bradykinin B1 receptor agonist, desArg9-bradykinin, did not affect cyclic AMP formation in isoprenaline prestimulated cells, while the bradykinin B2 receptor antagonists, Hoe 140 (D-Arg[Hyp3, Thi5, D-Tic7, Oic8]-BK) and D-Arg[Hyp3, Thi5,8, D-Phe7]-BK completely abolished the bradykinin response in both forskolin and isoprenaline prestimulated cells. 7. Bradykinin caused an increase in intracellular Ca2+, which was antagonized by the bradykinin B2 receptor antagonists, Hoe 140 and D-Arg[Hyp3, Thi5,8, D-Phe7]-BK. The bradykinin B2 receptor agonist,desArg9-bradykinin, did not evoke a rise in cytoplasmic Ca2 .8. It is concluded, that stimulation of bradykinin B2 receptors causes a reduction in cellular cyclic AMP in DDT1, MF-2 cells. This decline in cyclic AMP is partly mediated by a Ca2+/calmodulin independent activation of phosphodiesterase activity. The increase in [Ca2+], mediated by bradykinin B2 receptors inhibited forskolin- and isoprenaline-activated adenylyl cyclase differently, most likely by interfering with different components of the adenylyl cyclase signalling pathway.
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PMID:Ca(2+)-dependent and -independent mechanism of cyclic-AMP reduction: mediation by bradykinin B2 receptors. 758 24

The bradykinin regulation of calcium channel currents in NG108-15 neuroblastoma x glioma hybrid cells was examined, in order to determine: (1) which type of bradykinin receptors mediates the inhibition of N-type calcium channels in these cells; and (2) whether bradykinin can modulate other types of calcium channels in these cells. Bradykinin inhibited both N- and L-type calcium channels in NG108-15 cells, with EC50S of 10 +/- 2 nM and 29 +/- 7 nM, respectively. The inhibition of both L- and N-type calcium channels by bradykinin (100 nM) could be completely inhibited by the bradykinin B2 receptor antagonist Hoe 140 (10 nM). Bradykinin appeared to inhibit that portion of the L-type calcium channel current that was also reversibly inhibited by omega-conotoxin GVIA. The bradykinin inhibition of the L-type calcium channel current was partly reduced by pretreatment of the cells with pertussis toxin, whereas the inhibition of the N-type current was pertussis toxin-insensitive. In some cultures it was observed that the bradykinin B1 receptor agonist desArg9bradykinin inhibited the L-type calcium channel current.
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PMID:Bradykinin inhibition of N- and L-type calcium channel currents in NG108-15 cells. 914 48