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Drobnoustroje jelitowe fizjologicznym partnerem gospodarza

100%

Binek M., Rzewuska M., Kizerwetter-Swida M., Chrobak-Chmiel D., Gierynska M., Cisek A. A.

Medycyna Weterynaryjna

2016

tom 72

nr 09

The gastrointestinal tract in humans and animals contains a very large number of highly diverse microorganisms. This microbiota plays a major role in the host’s physiology, homeostasis, and well-being. It forms a barrier against infection, helps to develop and mature the immune system, and participates in the extraction of nutrients and energy from food. Various members of microbial community maintain the integrity of the intestinal barrier and promote epithelial repair after injury. The intestinal barrier defenses consist of the mucous layer, antimicrobial peptides, secretory IgA, and the epithelial barrier function by junctional adhesion complex. A healthy host exists in a state of balance with its microorganisms. A disruption of the microbial community increases the host’s susceptibility to infection. Although the immune response is necessary for the host to eliminate the invading pathogen, certain aspects of the host’s response may work to the pathogen’s advantage. Certain components of the microbiota have been shown to drive inflammatory response, which, if uncontrolled, has the potential to induce a pathological response, whereas others enhance or promote antiinflammatory responses. The effector microbial molecules are usually detected via receptor-signaling pathways including Toll-like receptors, NOD-like receptors, and C-type lectin receptors. These pattern-recognition receptors (PRRs) interact with and identify microbe-associated molecular patterns (MAMPs) of both commensal and pathogenic bacteria. PRRs signaling, once thought to exclusively yield pro-inflammatory activation by pathogenic bacteria, is now known to be differentially activated by commensal and probiotic bacteria to induce pathways involved in gut homeostasis, cytoprotection, epithelial cell proliferation, regulation of tight junctions, and antimicrobial peptide secretion. The microbial-epithelial cross-talk is fundamental in appreciating how the developing intestine achieves tolerance to bacteria and how dysregulation of this process may predispose the gut to inflammation and disease.

Mikrobiom jelitowy kury domowej - rozwój i funkcja

80%

Binek M., Cisek A. A., Rzewuska M., Chrobak-Chmiel D., Stefanska I., Kizerwatter-Swida M.

Medycyna Weterynaryjna

2017

tom 73

nr 10

Chicken ceca contain an immense number of microorganisms collectively known as the microbiome. This community is now recognized as an essential component of the intestinal ecosystem and referred to as a metabolic organ exquisitely tuned to the host’s physiology. These functions include the ability to process otherwise indigestible components of the feed, converting them into energy and body mass. The gut microbiome can also affect intestinal morphology and modulate the development and function of the immune system. This microbiota contains a rich collection of genes encoding enzymes necessary for decomposition of dietary polysaccharides and oligosaccharides, nitrogen metabolism, fatty acid and lipid metabolism, and pathways involved in a hydrogen sink. Chickens, like most animals, lack the genes for glycoside hydrolase, polysaccharide lyase, and carbohydrate esterase enzymes that are necessary to facilitate the degradation of non-starch polysaccharides. During the decomposition of dietary polysaccharides, bacteria produce short-chain (volatile) fatty acids (SCFAs), such as acetic, propionic and butyric acid. These SCFASs are absorbed transepithelially and serve as a source of energy for the host. The accumulation of molecular hydrogen released during fermentation leads to fermentation slowdown or to the production of less energy-efficient substances, such as ethanol, butyrate and propionate. The presence of bacteria that act as a hydrogen sink results in a switch to the more productive fermentation into acetate and increased production of SCFAs. Such activity could lead to a significant improvement in poultry production and the associated economics.

Ograniczanie wyników

2 Medycyna Weterynaryjna

2 Binek M.

2 Chrobak-Chmiel D.

2 Cisek A. A.

2 Rzewuska M.

1 Gierynska M.

1 Kizerwatter-Swida M.

1 Kizerwetter-Swida M.

1 Stefanska I.

1 2017

1 2016

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Drobnoustroje jelitowe fizjologicznym partnerem gospodarza

Mikrobiom jelitowy kury domowej - rozwój i funkcja