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<dc:title xml:lang="en">Impact of periodontal inflammation on the cardiac splenic axis : study of Neutrophils Extracellular Traps (NETs) and splenic microvesicles as mediators of procoagulant and inflammatory responses</dc:title>
<dcterms:alternative xml:lang="fr">Impact de l'inflammation parodontale sur l'axe splénique cardiaque : étude des Neutrophils Extracellular Traps (NETs) et des microvésicules spléniques comme médiateurs des réponses procoagulantes et inflammatoires</dcterms:alternative>
<dc:subject xml:lang="fr">Parodontite</dc:subject>
<dc:subject xml:lang="fr">Porphyromonas gingivalis</dc:subject>
<dc:subject xml:lang="fr">Effet paracrine des microvésicules</dc:subject>
<dc:subject xml:lang="fr">Sénescence endothéliale</dc:subject>
<dc:subject xml:lang="en">Periodontitis</dc:subject>
<dc:subject xml:lang="en">Porphyromonas gingivalis</dc:subject>
<dc:subject xml:lang="en">Microvesicles mediated cross-talk</dc:subject>
<dc:subject xml:lang="en">Endothelial senescence</dc:subject>
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<tef:elementdEntree autoriteExterne="040817482" autoriteSource="Sudoc">Porphyromonas gingivalis</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">P.gingivalis (PG) induit la parodontite et est associée au risque cardiovasculaire. Les microvésicules (MV) sont des effecteurs pro-inflammatoires et coagulants libérés des membranes plasmiques. L’effet à distance de PG sur le cœur et la rate de souris est détecté par immuno-marquage, mesure de ROS, et émission de MVs splénocytaires (SMVs). Les lésions gingivales par fils (LIG) imbibés ou non de PG (LIG-PG) sont comparées au gavage (gvg) et à l'injection intrapéritonéale (IP). LIG et LIG-PG réduisent les granulocytes, doublent les monocytes et les neutrophiles spléniques, sans réponse adaptative. IP triple les monocytes, multiplie par 10 les neutrophiles, réduit par 2 lymphocytes T ou B. L'inhibiteur de PAD-4 réduit les ROS, suggérant une Nétose. In vitro, les SMVs de LIG-PG, IP et gvg induisent la sénescence endothéliale. Dans le cœur, VCAM, Gasdermin-D, IL-6 et TNF- inflammatoires sont surexprimés pour IP et LIG-PG.En conclusion, PG induit l’activation splénique et cardiaque à distance, l'émission de SMVs pro-coagulantes et -sénescentes favorisant le risque cardiovasculaire.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Periodontitis, mainly induced by P.gingivalis (PG) is associated with cardiovascular risk. Microvesicles (MVs) are pro-inflammatory and -coagulant effectors shed from plasma membranes. We evaluated the remote inflammatory impact of PG on heart and spleen tissue by immunostaining, ROS formation, and on endothelial senescence. In mice, ligature and/or PG gum injury by threads (LIG) soaked or not with PG (LP,LP 4w) were compared to oral gavage (gvg) and intraperitoneal injection (IP). LIG and LIG-PG reduced spleen granulocytes, doubled monocytes and neutrophils with no adaptative responses in 2-4 weeks. IP tripled monocytes with 10 folds neutrophil rise and half T or B lymphocytes. PAD-4 inhibitor decreased ROS , pointing at Netosis contribution. Splenocytes MVs (SMVs) raised in IP. In vitro, LIG-PG, IP and gvg SMVs induced coronary endothelial senescence. In heart extracts, pro-inflammatory VCAM, Gasdermin-D, IL-6, and TNF- were only up-regulated in IP and LIG-PG. Anti-inflammatory IL-10 raised in IP.Altogether, PG induces remote spleen and heart activation, the shedding of pro-coagulant and -senescent SMVs possibly favoring cardiovascular risk.</dcterms:abstract>
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