Dysbiosis and disturbances in gut homeostasis may result in dysregulated responses, which are common in inflammatory bowel diseases (IBD). These conditions may be refractory to the usual treatments and novel therapies are still necessary to reach a more successful regulation of intestinal immunity. The hormone melatonin (MLT) has been raised as a therapeutic alternative because of its known interactions with immune responses and gut microbiota. Hence, we evaluated the effects of MLT in experimental colitis that evolves with intestinal dysbiosis, inflammation and bacterial translocation. C57BL/6 mice were exposed to dextran sulfate sodium and treated with MLT. In acute colitis, the hormone led to increased clinical, systemic and intestinal inflammatory parameters. During remission, continued MLT administration delayed recovery, increased TNF, memory effector lymphocytes and diminished spleen regulatory cells. MLT treatment reduced Bacteroidetes and augmented Actinobacteria and Verrucomicrobia phyla in mice feces. Microbiota depletion resulted in a remarkable reversion of the colitis phenotype after MLT administration, including a counter-regulatory immune response, reduction in TNF and colon macrophages. There was a decrease in Actinobacteria, Firmicutes and, most strikingly, Verrucomicrobia phylum in recovering mice. Finally, these results pointed to a gut-microbiota-dependent effect of MLT in the potentiation of intestinal inflammation. At the end of the experimental protocols, the mice were euthanized. The blood was collected for sera storage, as well as total and specific cell counting by Panotico staining.
The colon was divided into fragments for immunological and tissue inflammation assessment, followed by immediate freezing in liquid nitrogen for ELISA, myeloperoxidase (MPO) and N-acetylglucosaminidase (NAG) assays. There was also the collection of the spleen and mesenteric lymph nodes (MLN) for culture, cytokine measurement and cell phenotyping.
The intestinal permeability assay was performed to evaluate the barrier integrity using the FITC-Dextran quantification method. In summary, food and water were withdrawn 12 h before euthanasia, followed by oral administration of the permeability marker at a concentration of 44 mg/100 g body weight (FITC-Dextran, MW 4000; FD4; Sigma-Aldrich, St. Louis, MO, USA). Serum was collected 4 h later and the fluorescence intensity was determined by a fluorimetry reading (excitation, 483 nm; emission, 525 nm).
Politics latest: Johnson meets Trump 'to discuss Ukraine'; Union drops strike ballot after last minute offer of talks
The two former leaders met while Mr Johnson was touring the US, with his spokesman saying the pair talked about 'the vital importance' of victory for Ukraine. Meanwhile, a major civil service union has dropped plans to ballot its staff for walkouts.
Can diet and exercise improve gut microbiota and health in older adults? Research paper discusses how the gut microbiome changes with age and its role in immune function and inflammation. It also highlights the need for more research to understand how diet and exercise can influence the aging microbiome.
Gut microbiome dysbiosis across early Parkinson’s disease, REM sleep behavior disorder and their first-degree relatives - Nature Communications Microbiota-gut-brain axis may play an important role in Parkinson’s disease (PD). Here, the authors assess gut microbiota in early PD, REM sleep behaviour disorder (RBD) and first-degree relatives of RBD and show PD-like gut dysbiosis occurs in RBD and their first-degree relatives.
Metabolic Signatures of Performance in Elite World Tour Professional Male Cyclists - Sports Medicine Background and Objective Metabolomics studies of recreational and elite athletes have been so far limited to venipuncture-dependent blood sample collection in the setting of controlled training and medical facilities. However, limited to no information is currently available to determine if findings in laboratory settings are translatable to a real-world scenario in elite competitions. The goal of this study was to define molecular signatures of exertion under controlled exercise conditions and use these signatures as a framework for assessing cycling performance in a World Tour competition. Methods To characterize molecular profiles of exertion in elite athletes during cycling, we performed metabolomics analyses on blood isolated from 28 international-level, elite, World Tour professional male athletes from a Union Cycliste Internationale World Team taken before and after a graded exercise test to volitional exhaustion and before and after a long aerobic training session. Moreover, established signatures were then used to characterize the metabolic physiology of five of these cyclists who were selected to represent the same Union Cycliste Internationale World Team during a seven-stage elite World Tour race. Results Using dried blood spot collection to circumvent logistical hurdles associated with field sampling, these studies defined metabolite signatures and fold change ranges of anaerobic or aerobic exertion in elite cyclists, respectively. Blood profiles of lactate, carboxylic acids, fatty acids, and acylcarnitines differed between exercise modes. The graded exercise test elicited significant two- to three-fold accumulations in lactate and succinate, in addition to significant elevations in free fatty acids and acylcarnitines. Conversely, the long aerobic training session elicited a larger magnitude of increase in fatty acids and acylcarnitines without appreciable increases in lactate or succinate. Comparable signatures were revealed after sprinting and climbing
Woman, 36, dies after 'hostage' situation in Kent as police treat incident as murder Gunshots had been heard after police smashed into a house in Dartford to free a woman who was being held hostage, according to witnesses. She died two days later in hospital from her injuries.