Project description:Transport stress is a big threat to most teleost fish during production practice, causing mass loss to the aquaculture industry. Fish gills are mucosa-associated lymphoid tissue that directly contacted with water, which is the good choice to study the mechanism of transport stress. Gills transcriptome results revealed 1551 differentially expressed genes (744 up-regulated and 807 down- regulated) between the control and 16h transportation groups. The top 10 enriched KEGG pathways are all immune-related. After qRT-PCR validation, we found that the toll-like receptors and nod-like receptors signaling pathways mediate the gill’s immune response to transport stress: tlr5, tnfɑ, hsp90ɑ, il-1ß and map2k4 were significantly up-regulated and arrdc2 was significantly down-regulated under transport stress. These results suggested that the transport stress altered innate immunity responses and induced metabolic changes in gills of hybrid yellow catfish. In conclusion, the results provide new perspectives on immune response in yellow catfish against transport stress and provide the possibility of mining resistance genes for future optimize transportation plan.
Project description:In order to explore the changes in protein expression of large yellow croaker Larimichthys crocea under high temperature stress, isobaric tags for relative and absolute quantitation (iTRAQ) combined with liquid chromatography-tandem mass spectrometry (LC-MS/MS) was used to perform proteome analysis on the liver between thermal-tolerant and thermal-sensitive groups of large yellow croaker.
Project description:We sequenced mRNA from 4 liver samples of the large yellow croaker (Larimichthys crocea) taken from thermal stress treatment fish, normal temperature treatment fish, cold stress treatment fish and fasting stress treatment fish, respectively, to investigate the transcriptome and comparative expression profiles of the large yellow croaker liver undergoing thermal stress, cold stress and fasting.
Project description:We sequenced mRNA from 2 muscle samples of the large yellow croaker (Larimichthys crocea) taken from normal feeding fish and fasting stress treatment fish, respectively, to investigate the transcriptome and comparative expression profiles of the large yellow croaker muscle undergoing fasting.
Project description:We sequenced mRNA from 4 liver samples of the large yellow croaker (Larimichthys crocea) taken from thermal stress treatment fish, normal temperature treatment fish, cold stress treatment fish and fasting stress treatment fish, respectively, to investigate the transcriptome and comparative expression profiles of the large yellow croaker liver undergoing thermal stress, cold stress and fasting. Liver mRNA profiles of control group (LB2A), thermal stress group (LC2A), cold stress group (LA2A) and 21-day fasting group (LF1A) were generated by RNA-seq, using Illumina HiSeq 2000.
Project description:The skin transcriptomes were examined by high-throughput sequencing at control group and 16 h transport group. A total of 1577 genes were differentially expressed, including 892 up-regulated and 685 down-regulated. It is interesting to note that the qPCR analysis further confirmed that the skin's immune response to transport stress was activated via Toll-like receptors (TLRs) and NOD-like receptors (NLRs) in skin: the tlr9, mfn2 and ikbke were significantly up-regulated and nfkbia, map3k7cl were significantly down-regulated. Overall results suggested that transport stress. The overall results suggest that the skin responds to transport stress by regulating mucus secretion and activating the immune signal pathway. This study will help to optimize the transport conditions for cultured hybrid yellow catfish.
Project description:We sequenced mRNA from 2 muscle samples of the large yellow croaker (Larimichthys crocea) taken from normal feeding fish and fasting stress treatment fish, respectively, to investigate the transcriptome and comparative expression profiles of the large yellow croaker muscle undergoing fasting. Muscle mRNA profiles of control group (M7C) and 21-day fasting group (M7E) were generated by RNA-seq using Illumina HiSeq 2500.
Project description:The transport of live fish is a routine operation in aquaculture. However, the effects of transport stress on intestines gene expression profile is poorly understood. The results from the transcriptome analysis revealed that most differentially expression genes (DEGs) were enriched in immune and metabolic related signaling pathways. Toll like receptors is a potential pathway in immune response induced by transport stress. Changes in genes related to lipid metabolism may be related to the increased metabolic expenditure for the normal body functions in a response to transport stress. In addition, changes in gene expression in the control, transport, and recovery groups were revealed that transport-induced local immune damage is reversible while metabolic disorder has hysteresis. These results provide new perspectives on immune and metabolic response in yellow catfish against transport stress and theoretical support for future optimization of their transportation.
Project description:Ammonia is a toxic by-product of metabolism that causes cellular stress. Although a number of proteins are involved in adaptive stress response, specific factors that counteract ammonia-induced cellular stress and regulate cell metabolism that facilitate survival against toxicity have yet to be identified. We demonstrated that hypoxia-inducible factor-1α (HIF-1α) is stabilised and activated by ammonia stress. HIF-1α activated by ammonium chloride compromises ammonia-induced apoptosis. Furthermore, we identified glutamine synthetase (GS) as a key driver of cancer cell proliferation and glutamine-dependent metabolism under ammonia stress in ovarian cancer stem-like cells expressing CD90. Interestingly, activated HIF-1α counteracts glutamine synthetase function in glutamine metabolism by facilitating glycolysis and elevating glucose dependency. Our studies reveal the hitherto unknown functions of HIF-1α in biphasic ammonia stress management in cancer stem-like cells. GS facilitates proliferation and HIF-1α contributes to metabolic remodelling in cellular energy usage resulting in attenuated proliferation but conversely promoting cell survival.