豬RNA識(shí)別受體DHX15的克隆及其在誘導(dǎo)Ⅰ型IFNs中的作用研究
[Abstract]:DHX15 is a cytoplasmic RNA recognition receptor found in recent years, and belongs to the family of DEXD/ H-helicase. The DHX15 can be combined with the dsRNA of polyI: C or the virus through the helicase domain at the C end, then interacts with the VISA through the DEXDc domain of the N end, activates the IRF3, NF-EMAB and MAPK, and induces the IFN-1, The secretion of IL-6 and TNF-a. To date, only human and mouse DHX15 has been identified, and the study of porcine DHX15 (pDHX15, pDHX15) has not been reported. Therefore, the pDHX15 gene was cloned first, then the genetic evolution and molecular structure of the pDHX15 gene were analyzed, and then the role of the pDHX15 gene in the induction of type I interferon was studied. The main contents of this study are as follows:1. Cloning and sequence analysis of 1. pDHX15 gene. The pDHX15 gene was cloned from peripheral blood lymphocytes (PBMCs) by RT-PCR, and then inserted into pJET1.2/ blunted cloning vector to construct pJET1.2-pDHX15. The sequence analysis showed that the full length of the open reading frame (ORF) of the pDHX15 gene was 2388 bp, encoding 795 amino acids, and the homology with the mammals such as human, mouse, rat, cattle, sheep, dog, cat, horse and other mammals was over 99.4%, and compared with the amphibian African claw, the Chinese soft-shelled turtle and the bird's green-headed duck. The homology of the fish zebrafish is relatively low, 92.2%, 95.3%, 94.2% and 91.3%, respectively; the structural analysis shows that the pDHX15 contains two loose domains at the N end, the DEAH-box conserved domain and the HELICc helicase active domain, The expression of pDHX15 mRNA in different tissues was analyzed by semi-quantitative RT-PCR and Real-time PCR. The results show that the pDHX15mRNA is widely expressed in all the detected tissues, including peripheral blood, heart, liver, spleen, lung, kidney, small intestine, lymph node and skin, wherein the expression of pDHX15mRNA is the highest in the lung, lymph node and small intestine, and the heart, spleen, kidney and skin are the second. The expression of peripheral blood and liver is the least. In addition, in order to study the subcellular localization of pDHX15, the pDHX15 eukaryotic expression vector pEGFP-pDHX15, which is constructed by fusion expression with the EGFP label, is respectively and targeted to be located in the nucleus and the endoplasmic reticulum, HEK293T cells were co-transfected with the red fluorescent plasmids of the Golgi and the mitochondria, and the subcellular localization of pDHX15 was determined by a laser confocal microscope at 24 h. The results show that, in the HEK293T cells transfected with pEGFP-pDHX15, the pDHX15 with green fluorescence is distributed in the whole cell, and can be respectively connected with the nucleus, the endoplasmic reticulum and the mitochondria. the role of pDHX15 in inducing the production of type I interferon is to study the role of pDHX15 in inducing the production of type I interferon, and the constructed eukaryotic expression vector pCAGGS-HA-pDHX15, pCAGGS-pDHX15-pDHDUF, The pCAGGS-pDHX15-DDUF-pDHA2 and pCAGGS-pDHX15-DEXDc were co-transfected with the porcine source IFN-yeast promoter and the transcription regulatory element IRF3 and the NF-VIB luciferase reporter plasmid, respectively, to HEK293T cells. The results showed that, under the stimulation of poly (I: C), pCAGGS-HA-pDHX15 significantly activated transcription factors IRF3, NF-B and IFN-B in a dose-dependent manner; after pDHX15 was knocked down with siRNA, the activation of poly (I: C)-induced IRF3 and NF-EMAB and IFN-1 was significantly reduced. In addition, that deletion mutation of the pDHX15 domain show that the DUF domain and the HELIC enzyme activity domain belong to the negative regulatory domain, and the activation of the poly (I: C)-induced IRF3 and NF-EMAB and the IFN-antigen can be negatively regulated. However, the HA2 domain and the DEXD domain are forward regulatory domains that are capable of modulating poly (I: C) to induce the production of IRF3, NF-B, and IFN-C. Further studies have found that pDHX15 induces the expression of IFN-antigen in a dose-dependent manner by the recruitment of key linker molecules VISA and MITA to activate IRF3 and NF-B. In general, pDHX15 is a natural immune RNA recognition receptor for pigs and plays an important role in inducing the production of type I IFNs.
【學(xué)位授予單位】:甘肅農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:S828;Q78
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