Project description:We analyzed if genomic responses of adult zebrafish tissues can reproduce the mammalian known inflammatory process induced by acute endotoxin stress. Although the strength of the inflammatory process was influenced by tissue nature, gene regulation was well conserved across evolution and zebrafish genomic responses highly correlated with mammals’ inflammatory reactions after lipopolysaccharide stimulation.
Project description:We used a Diet-Induced-Obesity approach using the zebrafish (Danio rerio) based on overfeeding to analyze the liver transcriptomic modulation in the disease and to determine how the obesity affects the immune response against an acute inflammatory stimulus as the lipopolysacharide (LPS). Overfed zebrafish were obese and showed signs of steatosis in their liver. Furthermore, the gene modulation profile resembled to that observed in humans. After the inflammatory stimulus, there was a clear differential immune response in normal and overfed fish. In normal fish, the response to LPS reported a typical host defensive reaction comparable to the one occurring in stimulated mammals whereas there was not any significantly modulated gene when comparing the expression of liver from LPS-stimulated with non-stimulated obese zebrafish.
Project description:Cyberlindnera jadinii yeast is a potential sustainable novel feed ingredient for aquaculture industries. Yeasts contain bio-active components and proteins such as beta-glucans, mannans, nucleic acids and proteins that can enhance fish immunity against the disease. In our study, we focused on the characterization of intestinal immunoregulatory pathways in zebrafish (Danio rerio) by quantifying the intestine proteins with isobaric tags for relative and absolute quantitation (iTRAQ) and 2D LC-MS/MS approach. Zebrafish were fed either a control diet (C) or a diet supplemented with autolyzed C. jadinii (ACJ). The KEGG pathways analysis revealed that compared with the control diet, the ACJ yeast diet induced an increased abundance of proteins related to arginine and proline metabolism, phagosome, C-lectin receptor signalling pathway, ribosome pathway and PPAR signalling pathway, which can modulate and enhance the innate response of zebrafish. Moreover, fish fed ACJ yeast diet also showed decreased abundance of proteins associated with inflammatory pathways including apoptosis, necroptosis and ferroptosis pathways. These findings support a mobilization of the innate immune response and a control of inflammatory-related pathways in the intestine of zebrafish. Our findings in the well annotated proteome of zebrafish enabled a detailed investigation of intestinal responses and provide insight into the health-beneficial effects of the yeast species C. jadinii relevant for aquaculture species.
