title: Differential inhibition of signaling pathways by two new imidazo-pyrazoles molecules in fMLF-OMe- and IL8-stimulated human neutrophil.
abstract: N-formyl-methionyl-leucyl-phenylalanine (fMLF), its methyl ester fMLF-OMe and interleukin 8 (IL8) play a pivotal role in neutrophil chemotaxis regulation in the latter and early stages, respectively, but the mechanisms through which the signal transduction pathways activate this function are not yet completely understood. Compounds 3l and 3r, a new class of arylcarbamoyl-imidazo-pyrazoles derivatives, were described as the first example of compounds able to inhibit human neutrophil chemotaxis induced by both fMLF-OMe and IL8. Here, we report their effects on superoxide production and lysozyme release. No inhibition was observed, thus they could be defined as "pure" chemotactic antagonists. Therefore, such molecules were used to highlight specific kinases involved in neutrophil chemotaxis. Our data provide support that compounds 3l and 3r strongly inhibit p38 MAPK with either fMLF-OMe or IL8 chemoattractants, while they show different signaling pathways regarding PKC isoforms suggesting that a fine tuning of the neutrophil activation occurs through differences in the activation of signaling pathways. Neither fMLF-OMe nor IL8 were able to obtain activation of the PI3K/Akt pathway. Since anomalous activation of neutrophil recruitment is one of the causes of many inflammatory diseases, the good versatility of our derivatives could represent the most important characteristic of these new molecules in the development of novel therapeutics.
authors: Dipartimento di Scienze Mediche, U.O. Genetica Medica, Università di Ferrara, Via F. di Mortara 74, 44121 Ferrara, Italy. Electronic address: rita.selvatici@unife.it.
authors: Rita
authors: R
authors: Selvatici
authors: Chiara
authors: C
authors: Brullo
authors: Olga
authors: O
authors: Bruno
authors: Susanna
authors: S
authors: Spisani
mesh_terms: D002633:Chemotaxis / Q000187:drug effects; D006801:Humans; D007093:Imidazoles / Q000737:chemistry*; D016209:Interleukin-8 / Q000494:pharmacology*; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000031:analogs & derivatives* / Q000494:pharmacology; D009504:Neutrophils / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D011720:Pyrazoles / Q000737:chemistry* / Q000494:pharmacology*; D015398:Signal Transduction / Q000187:drug effects*; D013329:Structure-Activity Relationship; D013481:Superoxides / Q000378:metabolism
chemical_list: D007093:Imidazoles; D016209:Interleukin-8; D011720:Pyrazoles; C105982:formyl-methionyl-leucyl-N-methylphenylalanine methyl ester; D013481:Superoxides; C031280:pyrazole; D009240:N-Formylmethionine Leucyl-Phenylalanine
keywords: Chemotaxis; IL8; Neutrophil chemotactic inhibitors; Signaling pathways.; fMLF-OMe