Inflamed phenotype of the mesenteric microcirculation of melanocortin type 3 receptor‐null mice after ischemia‐reperfusion
| Autor: | Hetal B. Patel, Paolo Grieco, Joanne F. Murray, Giovanna Leoni, Mauro Perretti, Stephen J. Getting, André L. F. Sampaio, Felicity N. E. Gavins |
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| Rok vydání: | 2008 |
| Předmět: |
Male
medicine.medical_specialty Chemokine CXCL1 Ischemia Down-Regulation Inflammation Biology Biochemistry Research Communications Microcirculation Mice GPCR Cell Movement Internal medicine medicine.artery intravital microscopy Cell Adhesion Genetics medicine Animals Mesentery Melanocyte-Stimulating Hormones Superior mesenteric artery L-Selectin Frameshift Mutation Receptor Molecular Biology Chemokine CCL2 CD11b Antigen medicine.disease Extravasation CXCL1 Phenotype Endocrinology Reperfusion Injury cell trafficking Inflammation Mediators Melanocortin medicine.symptom Receptor Melanocortin Type 3 Biotechnology |
| Zdroj: | The FASEB Journal |
| ISSN: | 1530-6860 0892-6638 |
| DOI: | 10.1096/fj.08-113886 |
| Popis: | The existence of anti-inflammatory circuits centered on melanocortin receptors (MCRs) has been supported by the inhibitory properties displayed by melanocortin peptides in models of inflammation and tissue injury. Here we addressed the pathophysiological effect that one MCR, MCR type 3 (MC3R), might have on vascular inflammation. After occlusion (35 min) and reopening of the superior mesenteric artery, MC3R-null mice displayed a higher degree of plasma extravasation (45 min postreperfusion) and cell adhesion and emigration (90 min postreperfusion). These cellular alterations were complemented by higher expression of mesenteric tissue CCL2 and CXCL1 (mRNA and protein) and myeloperoxydase, as compared with wild-type animals. MC1R and MC3R mRNA and protein were both expressed in the inflamed mesenteric tissue; however, no changes in vascular responses were observed in a mouse colony bearing an inactive MC1R. Pharmacological treatment of animals with a selective MC3R agonist ([d-Trp8]-γ-melanocyte-stimulating hormone; 10 μg i.v.) produced marked attenuation of cell adhesion, emigration, and chemokine generation; such effects were absent in MC3R-null mice. These new data reveal the existence of a tonic inhibitory signal provided by MC3R in the mesenteric microcirculation of the mouse, acting to down-regulate cell trafficking and local mediator generation.—Leoni, G., Patel, H. B., Sampaio, A. L. F., Gavins, F. N. E., Murray, J. F., Grieco, P., Getting, S. J., Perretti, M. Inflamed phenotype of the mesenteric microcirculation of melanocortin type 3 receptor-null mice after ischemia-reperfusion. |
| Databáze: | OpenAIRE |
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