Molecular cloning and characterizations of porcine SAMHD1 and its roles in replication of highly pathogenic porcine reproductive and respiratory syndrome virus

文献类型： 外文期刊

第一作者： Yang, Shen

作者： Yang, Shen;Shan, Tongling;Zhou, Yanjun;Jiang, Yifeng;Tong, Wu;Liu, Fei;Wen, Feng;Zhang, Qingzhan;Tong, Guangzhi;Shan, Tongling;Zhou, Yanjun;Tong, Guangzhi

作者机构：

关键词： SAMHD1;Porcine;Antiviral effect;HP-PRRSV

期刊名称：DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY （ 影响因子：3.636； 五年影响因子：3.654 ）

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收录情况： SCI

摘要： The sterile alpha motif and HD domain 1 (SAMHD1) protein is a novel innate immunity restriction factor that inhibits HIV-1 infection in myeloid cells. Here, we cloned the full-length SAMHD1 complementary DNA (cDNA) from porcine peripheral blood lymphocytes. The porcine SAMHD1 cDNA was of 3951 bp with an open reading frame of 1884 bp, encoding a polypeptide of 627 amino acids. Porcine SAMHD1 mRNA was detected in all swine tissues examined, with the higher expression in the tonsil, lung, liver, and lymph node tissues. The SAMHD1 protein was localized to the nucleus. Overexpression of SAMHD1 blocked the proliferation of HuN4, a highly pathogenic strain of porcine reproductive and respiratory syndrome virus (HP-PRRSV), in MARC-145 cells, by inhibiting the synthesis of the HuN4 complement RNA. The antiviral effects of the simian SAMHD1 protein were nearly equivalent to those of porcine SAMHD1 in the HuN4-infected MARC-145 cells. Phosphorylation analysis of SAMHD1 showed that overexpressed SAMHD1 protein was in primarily an unphosphorylated state. SAMHD1 overexpression increased the transcript abundance of IFN-stimulated genes ISG15 and ISG56. The mRNA levels of SAMHD1 and ISGs were significantly increased in porcine alveolar macrophages infected with HP-PRRSV. SAMHD1 protein level was also elevated, and the protein was not phosphorylated during infection. Collectively, our data indicate that SAMHDI inhibits HP-PRRSV proliferation through inhibiting the replication of HP-PRRSV. SAMHD1 might be the protein participating in the IFN signaling and is thus an important immunoregulatory protein in innate immunity. (C) 2014 Elsevier Ltd. All rights reserved.

分类号： R392

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