文献类型： 外文期刊

作者： Yang, Chao ¹ ; Dong, Junjian ¹ ; Sun, Chengfei ¹ ; Li, Wuhui ¹ ; Tian, Yuanyuan ¹ ; Liu, Zhigang ¹ ; Gao, Fengying ¹ ; Ye, Xing ¹ ;

作者机构： 1.Chinese Acad Fishery Sci, Pearl River Fisheries Inst, Key Lab Trop & Subtrop Fisheries Resource Applicat, Minist Agr & Rural Affairs, Guangzhou 510380, Peoples R China

2.Chinese Acad Fishery Sci, Pearl River Fisheries Inst, Key Lab Aquat Anim Immune Technol Guangdong Prov, Guangzhou 510380, Peoples R China

3.Shanghai Ocean Univ, Key Lab Explorat & Utilizat Aquat Genet Resources, Minist Educ, Shanghai 201306, Peoples R China

4.Shanghai Ocean Univ, Key Lab Freshwater Aquat Genet Resources, Minist Agr, Shanghai 201306, Peoples R China

5.1 Xingyu Rd,Dongjiao Dist, Guangzhou 510380, Guangdong, Peoples R China

关键词： Micropterus salmoides; Heat stress; Aeromonas veronii; Immune responses

期刊名称：COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY D-GENOMICS & PROTEOMICS （ 影响因子：3.306； 五年影响因子：3.251 ）

ISSN： 1744-117X

年卷期： 2022 年 43 卷

页码：

收录情况： SCI

摘要： In order to understand the molecular mechanism of response to heat stress in largemouth bass (LMB) Micropterus salmoides, we performed transcriptome analysis of spleen tissue of LMB subjected to heat stress and challenged with A. veronii under heat stress. A total of 2162 DEGs were identified between the heat stressed (32 degrees C) and control groups (24 degrees C) after 7 d treatment. Gene Ontology (GO) annotation analysis revealed that these differentially expressed genes (DEGs) were mainly enriched on GO terms of biological regulation, membrane part, and binding. ELISA validation indicated that except major histocompatibility complex II (Mhc II), the protein levels of t-Sod, caspase 3 (Casp3), tumor necrosis factor-alpha (Tnf-alpha), and complement component 3 (C3) were consistent with RNA-seq results. In the experiment of A. veronii challenged under heat stress (32 degrees C), 2899 and 2663 DEGs were obtained from the heat stress-challenged group (H6 vs H0, H12 vs H0), while 1485 and 3501 DEGs from the control-challenged group (C6 vs C0, C12 vs C0). GO and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analyses showed that immune-related categories and pathways were significantly enriched, such as immune system process, immune response and positive regulation of immune response in GO enrichment analysis, and cytokine-cytokine receptor interaction, human cytomegalovirus infection in KEGG signaling pathways. The expressions of f11, c1q and c3 in complement and coagulation pathway, as well as that of proinflammatory genes tnf-alpha and il-8, were deeply inhibited. Real-time quantitative PCR validation for nine DEGs showed that most of them had consistent expression trends with RNA-seq results. Our results indicated that heat stress affects the immunity and metabolism of LMB. In particular, it aggravates the inhibitory effects of A. veronii on the complement and coagulation systems while downregulating proinflammatory cytokine expression, thereby weakening the resistance of LMB to pathogen infection. Our results contribute to the elucidation of A. veronii infection pathogenic mechanisms in LMB under heat stress.