Ontology highlight
ABSTRACT:
PROVIDER: PRJNA1167687 | ENA |
REPOSITORIES: ENA
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Project description:Today, swine is regarded as promising biomedical model, however, its gastrointestinal microbiome dynamics have been less investigated than that of humans or murine models . The aim of this study was to establish a high-throughput multi-omics pipeline to investigate the healthy fecal microbiome of swine and its temporal dynamics as basis for future infection studies. To this end, a homogenization protocol based on deep-frozen feces followed by integrated sample preparation for different meta-omics analyses was developed. Subsequent data integration linked microbiome composition with function, i.e. expressed proteins and secreted metabolites.
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Project description:Mammalian feces can be collected non-invasively during field research and provides valuable information on the ecology and evolution of the host individuals. Undigested food objects, genome/metagenome, steroid hormones, and stable isotopes obtained from fecal samples provide evidence on diet, host/symbiont genetics, and physiological status of the individuals. However, proteins in mammalian feces have hardly been studied, which hampers the molecular investigations into the behavior and physiology of the host individuals. Here, we apply mass spectrometry-based proteomics to fecal samples (n = 10) that were collected from infant, juvenile, and adult captive Japanese macaques (Macaca fuscata) to describe the proteomes of the host, food, and intestinal microbes. The results show that fecal proteomics is a useful method to investigate dietary changes along with breastfeeding and weaning, to reveal the organ/tissue and taxonomy of dietary items, and to estimate physiological status inside intestinal tracts. These types of insights are difficult or impossible to obtain through other molecular approaches. Most mammalian species are facing extinction risk and there is an urgent need to obtain knowledge on their ecology and evolution for better conservation strategy. The fecal proteomics framework we present here is easily applicable to wild settings and other mammalian species, and provides direct evidence of their behavior and physiology.
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Project description:Liver transplantation is the only treatment option for patients with end-stage liver disease. However, a persistent disparity remains between supply and demand for donor organs suitable for transplantation, resulting in a waiting list mortality of up to 20%. This has resulted in an increasing use of high-risk grafts from suboptimal, extended criteria donors, including livers from donation after circulatory death (DCD) donors, and donors with significant comorbidities such as advanced age, diabetes mellitus and livers with high fat content. While cold storage remains sufficient for livers considered optimal for transplantation, ECD grafts are more vulnerable to cold ischemic damage, resulting in many of these grafts being rejected. As an alternative to cold storage, ex-situ normothermic machine perfusion (NMP) has become an increasingly popular method for preservation, transportation and assessment of ECD livers prior to transplantation. This allows for functional assessment of the graft and provides the opportunity to assess key processes that can be used to determine organ viability. The use of both hepatocellular and biliary viability criteria in selection of suboptimal livers from ECD donors has led to the successful transplantation of these grafts with a low incidence of post-transplant cholangiopathies. However, the mechanisms of biliary injury, and recovery thereof, following static cold storage remains poorly understood. Insight into these mechanisms may further improve preservation and selection of ECD livers. Therefore, we performed an in-depth proteomics analysis of bile samples collected from human ECD livers during NMP to identify potential mechanisms linked to biliary injury, function and regeneration over the course of the perfusion, and to assess whether biliary protein profiles can distinguish between transplantable and non-transplantable grafts.
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