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- W2016129330 abstract "As previously reported, alveolar macrophages (AMs) from ovalbumin-sensitized guinea pigs present an enhanced responsiveness to tachykinins but not to N-formylmethionyl-leucyl-phenylalanine (fMLP). We have investigated the biochemical mechanisms underlying this varied responsiveness to tachykinins. The protein kinase C (PKC) activator phorbol 12-myristate 13-acetate (PMA) induced a larger superoxide anion (O2-) production in AMs from sensitized guinea pigs, as did tachykinins. Pretreatment of AMs with pertussis toxin abolished tachykinin-evoked respiratory burst, had no effect on PMA-evoked O2- production and strongly inhibited fMLP-evoked one, with no appreciable variation between control or sensitized AMs. Staurosporine and its derivative cgp 41251, significantly decreased PMA- and tachykinin-evoked O2- production in both populations, being more potent in control AMs, but exerted little effects against fMLP. Pretreatment of AMs with PMA significantly inhibited fMLP-, PMA- and tachykinin-evoked O2- production in both control and sensitized AMs. fMLP, substance P (SP), neurokinin A (NKA) and the NK2 agonist [beta-Ala8]-NKA(4-10) dose-dependently increased [3H] phorbol 12, 13 dibutyrate (PDBu) binding to control and sensitized AMs. While fMLP exerted similar effects in both populations, dose-response curves for SP1 NKA and the NK2 receptor agonist were shifted leftwards (1, 4 and 3 orders of magnitude, respectively) in sensitized AMs. These results indicate a possible PKC involvement in the enhanced responsiveness to tachykinins in actively sensitized AMs." @default.
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- W2016129330 date "1996-06-01" @default.
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- W2016129330 title "Modulation by protein kinase C of the enhanced responsiveness to tachykinins in ovalbumin-sensitized guinea pig alveolar macrophages" @default.
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- W2016129330 doi "https://doi.org/10.1016/s0143-4179(96)90071-2" @default.
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