Search results for "inflammation"
showing 10 items of 2662 documents
Mast cell-derived mediators promote murine neutrophil effector functions
2013
Mast cells are able to trigger life-saving immune responses in murine models for acute inflammation. In such settings, several lines of evidence indicate that the rapid and protective recruitment of neutrophils initiated by the release of mast cell-derived pro-inflammatory mediators is a key element of innate immunity. Herein, we investigate the impact of mast cells on critical parameters of neutrophil effector function. In the presence of activated murine bone marrow-derived mast cells, neutrophils freshly isolated from bone marrow rapidly lose expression of CD62L and up-regulate CD11b, the latter being partly driven by mast cell-derived TNF and GM-CSF. Mast cells also strongly enhance neu…
Natural Products and Inflammation
2017
Inflammation (or inflammatory reaction) is the response to body aggression by a pathogen agent, an allergen, a toxic compound, a tissue lesion, etc.[...]
Pentoxifylline and Oxypurinol: Potential Drugs to Prevent the “Cytokine Release (Storm) Syndrome” Caused by SARS-CoV-2?
2020
Background: COVID-19, caused by SARS-CoV-2, is a potentially lethal, rapidly-expanding pandemic and many efforts are being carried out worldwide to understand and control the disease. COVID-19 patients may display a cytokine release syndrome, which causes severe lung inflammation, leading, in many instances, to death. Objective: This paper is intended to explore the possibilities of controlling the COVID-19-associated hyperinflammation by using licensed drugs with anti-inflammatory effects. Hypothesis: We have previously described that pentoxifylline alone, or in combination with oxypurinol, reduces the systemic inflammation caused by experimentally-induced pancreatitis in rats. Pentoxifyl…
SAR150640, a selective β3-adrenoceptor agonist, prevents human myometrial remodelling and activation of matrix metalloproteinase in an in vitro model…
2010
Background and purpose: The uterine pathophysiology underlying inflammatory conditions such as chorioamnionitis remains largely unclear. As we have shown that β3-adrenoceptors act as regulators of myometrial inflammation, we wanted to investigate the potential role of β3-adrenoceptors in preventing uterine remodelling induced by inflammation. Experimental approach: The consequences of human chorioamnionitis on myometrial remodelling were characterized by Sirius Red staining and metalloproteinase (MMP) expression, and compared with the effects of incubating human myometrial samples with Escherichia coli lipopolysaccharide (LPS) in vitro. We also assessed the effect of SAR150640, a selectiv…
Nitric oxide, derived from inducible nitric oxide synthase, decreases hypoxia inducible factor-1α in macrophages during aspirin-induced mesenteric in…
2010
Background and purpose: Nitric oxide (NO) modulates expression of hypoxia inducible factor-1 (HIF-1), a transcription factor regulating function of myeloid cells. Here, we have assessed the role played by NO, formed by inducible NOS (iNOS), in the inflammation induced by aspirin in the gut, by modulating HIF-1 activity. Experimental approach: The role of iNOS-derived NO on leucocyte–endothelial interactions induced by aspirin was evaluated by intravital microscopy in mesenteric venules of rats pretreated with selective iNOS inhibitors, 1400W or l-N6-(1-iminoethyl)-lysine. NO was localized by fluorescence microscopy, using DAF-FM. iNOS, HIF-1α and CD36 were localized by immunohistochemistr…
GABA and GABA receptors in the gastrointestinal tract: from motility to inflammation
2015
Although an extensive body of literature confirmed γ-aminobutyric acid (GABA) as mediator within the enteric nervous system (ENS) controlling gastrointestinal (GI) function, the true significance of GABAergic signalling in the gut is still a matter of debate. GABAergic cells in the bowel include neuronal and endocrine-like cells, suggesting GABA as modulator of both motor and secretory GI activity. GABA effects in the GI tract depend on the activation of ionotropic GABAA and GABAC receptors and metabotropic GABAB receptors, resulting in a potential noteworthy regulation of both the excitatory and inhibitory signalling in the ENS. However, the preservation of GABAergic signalling in the gut …
Differential effects of leflunomide on leukocytes: Inhibition of ratin vivo adhesion and humanin vitro oxidative burst without affecting surface mark…
1994
Leflunomide has been shown to combat effectively autoimmune diseases in a number of animal models, as well as chronic polyarthritis of humans. Here we report on the effects of this novel drug on the adherence of leukocytes to endothelium, an essential event in establishment and maintenance of inflammation. The entry of cells into tissues is dependent on interactions of adhesion molecules. The process of diapedesis, which these molecules control, involves three phases: tethering, triggering of receptors on endothelial cells and firm attachment of leukocytes to these cells. The interaction of LECAM-1 (constitutively expressed on circulating leukocytes) and P- and E-selectins on the vessel wll…
The nitric oxide related therapeutic phenomenon: a challenging task.
2002
Nitric oxide (NO), produced from L-arginine by the activity of constitutive and inducible NO synthases, has been implicated in a wide range of physiological and pathophysiological processes. Low concentrations of this mediator play homeostatic roles, whereas NO is up-regulated in a number of pathological states and can have damaging effects. Pharmacological modulation of NO levels or NO biosynthesis may be a therapeutic strategy for a number of conditions, although the reported results can be some times controversial. Inhibitors of NO synthases exhibit different selectivity for the neuronal, endothelial or inducible isoforms, which contributes to their beneficial and detrimental effects. Re…
Recent progress in revealing the biological and medical significance of the non-neuronal cholinergic system.
2015
This special issue of International Immunopharmacology is the proceedings of the Fourth International Symposium on Non-neuronal Acetylcholine that was held on August 28-30, 2014 at the Justus Liebig University of Giessen in Germany. It contains original contributions of meeting participants covering the significant progress in understanding of the biological and medical significance of the non-neuronal cholinergic system extending from exciting insights into molecular mechanisms regulating this system via miRNAs over the discovery of novel cholinergic cellular signaling circuitries to clinical implications in cancer, wound healing, immunity and inflammation, cardiovascular, respiratory and …
Effects of triterpenes on the immune system.
2010
Ethnopharmacological relevance: Triterpenes, which comprise a broad chemical group of active principles, are implicated in the mechanisms of action and pharmacological effects of many medicinal plants used in folk medicine against diseases in which the immune system is implicated. They have been described as anti-inflammatory, antiviral, antimicrobial, and antitumoral agents, as well as being immunomodulator compounds. Several of them are implicated in the resolution of immune diseases, although their effects have not always been clearly correlated. Aim of the review: The aim of this review is to compile relevant data on the mechanisms of action of triterpenes isolated from active ethnomedi…