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1.
EBioMedicine ; 79: 103974, 2022 May.
Artículo en Inglés | MEDLINE | ID: mdl-35430453

RESUMEN

BACKGROUND: Rheumatoid arthritis (RA) is a progressive degenerative disorder that leads to joint destruction. Available treatments only target the inflammatory component with minimal impact on joint repair. We recently uncovered a previously unappreciated family of pro-resolving mediators, the maresin conjugate in tissue regeneration (MCTR), that display both immunoregulatory and tissue-protective activities. Thus, we queried whether the production of these autacoids is disrupted in RA patients and whether they can be useful in treating joint inflammation and promoting joint repair. METHODS: Using a highly phenotyped RA cohort we evaluated plasma MCTR concentrations and correlated these to clinical markers of disease activity. To evaluate the immunoregulatory and tissue reparative activities we employed both in vivo models of arthritis and organ culture models. FINDINGS: Herein, we observed that plasma MCTR3 concentrations were negatively correlated with joint disease activity and severity in RA patients. Evaluation of the mechanisms engaged by this mediator in arthritic mice demonstrated that MCTR3 reprograms monocytes to confer enduring joint protective properties. Single cell transcriptomic profiling and flow cytometric evaluation of macrophages from mice treated with MCTR3-reprogrammed monocytes revealed a role for Arginase-1 (Arg-1) in mediating their joint reparative and pro-resolving activities. Arg-1 inhibition reversed both the anti-arthritic and tissue reparative actions of MCTR3-reprogrammed monocytes. INTERPRETATION: Our findings demonstrate that circulating MCTR3 levels are negatively correlated with disease in RA. When administered to mice in vivo, MCTR3 displayed both anti-inflammatory and joint reparative activities, protecting both cartilage and bone in murine arthritis. These activities were, at least in part, mediated via the reprogramming of mononuclear phagocyte responses. FUNDING: This work was supported by funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant no: 677542) and the Barts Charity (grant no: MGU0343) to J.D. J.D. is also supported by a Sir Henry Dale Fellowship jointly funded by the Wellcome Trust and the Royal Society (grant 107613/Z/15/Z).


Asunto(s)
Artritis Experimental , Artritis Reumatoide , Animales , Antiinflamatorios/farmacología , Arginasa/genética , Artritis Reumatoide/tratamiento farmacológico , Humanos , Macrófagos , Ratones , Monocitos
2.
Front Immunol ; 12: 649786, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33859641

RESUMEN

Neuromodulation of the immune system has been proposed as a novel therapeutic strategy for the treatment of inflammatory conditions. We recently demonstrated that stimulation of near-organ autonomic nerves to the spleen can be harnessed to modulate the inflammatory response in an anesthetized pig model. The development of neuromodulation therapy for the clinic requires chronic efficacy and safety testing in a large animal model. This manuscript describes the effects of longitudinal conscious splenic nerve neuromodulation in chronically-implanted pigs. Firstly, clinically-relevant stimulation parameters were refined to efficiently activate the splenic nerve while reducing changes in cardiovascular parameters. Subsequently, pigs were implanted with a circumferential cuff electrode around the splenic neurovascular bundle connected to an implantable pulse generator, using a minimally-invasive laparoscopic procedure. Tolerability of stimulation was demonstrated in freely-behaving pigs using the refined stimulation parameters. Longitudinal stimulation significantly reduced circulating tumor necrosis factor alpha levels induced by systemic endotoxemia. This effect was accompanied by reduced peripheral monocytopenia as well as a lower systemic accumulation of CD16+CD14high pro-inflammatory monocytes. Further, lipid mediator profiling analysis demonstrated an increased concentration of specialized pro-resolving mediators in peripheral plasma of stimulated animals, with a concomitant reduction of pro-inflammatory eicosanoids including prostaglandins. Terminal electrophysiological and physiological measurements and histopathological assessment demonstrated integrity of the splenic nerves up to 70 days post implantation. These chronic translational experiments demonstrate that daily splenic nerve neuromodulation, via implanted electronics and clinically-relevant stimulation parameters, is well tolerated and is able to prime the immune system toward a less inflammatory, pro-resolving phenotype.


Asunto(s)
Terapia por Estimulación Eléctrica/métodos , Endotoxemia/terapia , Neuroinmunomodulación/fisiología , Nervios Esplácnicos/fisiología , Bazo/inervación , Animales , Modelos Animales de Enfermedad , Terapia por Estimulación Eléctrica/instrumentación , Electrodos Implantados , Endotoxemia/inmunología , Femenino , Inflamación/inmunología , Inflamación/terapia , Bazo/inmunología , Sus scrofa
3.
Circ Res ; 126(1): 75-90, 2020 01 03.
Artículo en Inglés | MEDLINE | ID: mdl-31829100

RESUMEN

RATIONALE: Specialized pro-resolving mediators (SPM-lipoxins, resolvins, protectins, and maresins) are produced via the enzymatic conversion of essential fatty acids, including the omega-3 fatty acids docosahexaenoic acid and n-3 docosapentaenoic acid. These mediators exert potent leukocyte directed actions and control vascular inflammation. Supplementation of animals and humans with essential fatty acids, in particular omega-3 fatty acids, exerts protective actions reducing vascular and systemic inflammation. Of note, the mechanism(s) activated by these supplements in exerting their protective actions remain poorly understood. OBJECTIVE: Given that essential fatty acids are precursors in the biosynthesises of SPM, the aim of the present study was to establish the relationship between supplementation and peripheral SPM concentrations. We also investigated the relationship between changes in plasma SPM concentrations and peripheral blood platelet and leukocyte responses. METHODS AND RESULTS: Healthy volunteers were enrolled in a double-blinded, placebo-controlled, crossover study, and peripheral blood was collected at baseline, 2, 4, 6, and 24 hours post administration of placebo or one of 3 doses of an enriched marine oil supplement. Assessment of plasma SPM concentrations using lipid mediator profiling demonstrated a time- and dose-dependent increase in peripheral blood SPM concentration. Supplementation also led to a regulation of peripheral blood cell responses. Here we found a dose-dependent increase in neutrophil and monocyte phagocytosis of bacteria and a decrease in the diurnal activation of leukocytes and platelets, as measured by a reduction in adhesion molecule expression. In addition, transcriptomic analysis of peripheral blood cells demonstrated a marked change in transcript levels of immune and metabolic genes 24 hours post supplementation when compared with placebo. CONCLUSIONS: Together, these findings demonstrate that supplementation with an enriched marine oil leads to an increase in peripheral blood SPM concentrations and reprograms peripheral blood cells, indicating a role for SPM in mediating the immune-directed actions of this supplement. CLINICAL TRIAL REGISTRATION: URL: http://www.clinicaltrials.gov. Unique identifier: NCT03347006.


Asunto(s)
Suplementos Dietéticos , Ácidos Docosahexaenoicos/sangre , Ácidos Grasos Omega-3/farmacología , Aceites de Pescado/farmacología , Sistema Inmunológico/efectos de los fármacos , Lipoxinas/sangre , Adulto , Biomarcadores , Células Sanguíneas/efectos de los fármacos , Células Sanguíneas/metabolismo , Moléculas de Adhesión Celular/sangre , Ritmo Circadiano/efectos de los fármacos , Estudios Cruzados , Relación Dosis-Respuesta a Droga , Método Doble Ciego , Ácidos Grasos Esenciales/fisiología , Ácidos Grasos Omega-3/administración & dosificación , Femenino , Aceites de Pescado/administración & dosificación , Ontología de Genes , Humanos , Masculino , Persona de Mediana Edad , Fagocitosis/efectos de los fármacos , Factor de Activación Plaquetaria/farmacología , Agregación Plaquetaria/efectos de los fármacos , Transcripción Genética/efectos de los fármacos , Adulto Joven
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