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Radioactive in situ Hybridization for Detecting Diverse Gene Expression Patterns in Tissue
Published on: April 27, 2012
Molecular characterization, expression pattern and the function of TRAF2 from blood parrot Amphilophus citrinellus
Jie-Li Cai1, Yue Zhang2, Hui Gao2
1College of Marine Sciences, South China Agricultural University, Guangzhou, Guangdong, China; School of Life Sciences, South China Normal University, Guangzhou, Guangdong, China; College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong, China.
Abstract:
Tumor necrosis factor receptor-associated factor (TRAF) family is a critical signal transduction protein, and plays important roles in cell growth, apoptosis, and immune response, etc. In this study, molecular characteristics, expression patterns, and the role of TRAF2 in blood parrot Vieja synspila ♀ × Amphilophus citrinellus ♂, an important ornamental fish, were explored response to lipopolysaccharide (LPS) challenge. The full length of blood parrot TRAF2 was 2725 bp, with an open reading frame (ORF) of 1551 bp encoding 516 amino acids, and a molecular weight of 58.58 kDa. Blood parrot TRAF2 contained four conserved domains: RING, TRAF-type zinc finger, TRAF_BIRC3_bd, and MATH (Meprin and TRAF-C homology). Analysis of phylogenetic relationships showed that TRAF2 were conserved in different species, indicating that its role might be similar. Blood parrot TRAF2 mRNA could be detected in all of the tissues examined, and was distributed in both the cytoplasm and nucleus. The expression of blood parrot TRAF2 was up-regulated during LPS challenge. Overexpression of TRAF2 could significantly inhibit the activities of nuclear factor κB (NF-κB) and activated protein 1 (AP-1), and reduce the ratio of Bax/Bcl-2. This study indicated that the TRAF2 might play important roles in organisms during pathogen infection.
Insights
Tumor necrosis factor receptor-associated factor 2 (TRAF2) in blood parrot fish plays a key role in immune responses. Its expression increases upon bacterial challenge, suggesting a role in pathogen defense mechanisms.
Area of Science:
- Immunology
- Molecular Biology
- Fish Biology
Background:
- Tumor necrosis factor receptor-associated factor (TRAF) proteins are crucial for signal transduction in cellular processes like apoptosis and immune responses.
- TRAF2's specific function in ornamental fish, particularly during immune challenges, remains underexplored.
Purpose of the Study:
- To investigate the molecular characteristics, expression, and functional role of TRAF2 in blood parrot fish (Vieja synspila ♀ × Amphilophus citrinellus ♂).
- To understand TRAF2's response to lipopolysaccharide (LPS) challenge and its impact on key signaling pathways.
Main Methods:
- Molecular cloning and sequencing of the blood parrot TRAF2 gene.
- Phylogenetic analysis to assess evolutionary conservation.
- Quantitative analysis of TRAF2 mRNA expression in various tissues and under LPS stimulation.
- Functional assays involving TRAF2 overexpression to assess effects on NF-κB, AP-1, and Bax/Bcl-2 ratio.
Main Results:
- The blood parrot TRAF2 gene has a full length of 2725 bp, encoding 516 amino acids with conserved domains (RING, zinc finger, TRAF_BIRC3_bd, MATH).
- TRAF2 mRNA is widely distributed in tissues and its expression is significantly upregulated following LPS challenge.
- Overexpression of TRAF2 inhibited NF-κB and AP-1 activities and reduced the Bax/Bcl-2 ratio, indicating an anti-apoptotic effect.
Conclusions:
- Blood parrot TRAF2 is a conserved protein with a significant role in the immune response to pathogen infection.
- TRAF2 likely modulates inflammatory and apoptotic pathways, contributing to the fish's defense mechanisms against pathogens.
