Identification of CD14 transcript in blood polymorphonuclear neutrophil leukocytes and functional variation in Holsteins.

Identification of CD14 transcript in blood polymorphonuclear neutrophil leukocytes and functional variation in Holsteins.
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荷斯坦牛血液多形核中性粒细胞中 CD14 转录物的鉴定和功能变异。

DOI:
10.4238/gmr.15027932
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发表时间:
2016-04
期刊:
Genet Mol Res
影响因子:
--
通讯作者:
Zhu H B
Zhu H B
中科院分区:
其他
文献类型:
--
作者:
Huang J M;Wang X G;Jiang Q;Sun Y;Yang C H;Ju Z H;Hao H S;Wang C F;Zhong J F;Zhu H B

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多形核中性粒细胞(PMN)是奶牛乳腺的主要吞噬细胞,是奶牛乳腺炎感染时抵御病原体入侵的第一道防线。分化簇14(CD 14)主要在巨噬细胞和中性粒细胞中表达,并作为结合细菌脂多糖(LPS)的共受体,并在乳腺上皮细胞中将PMN募集到CD 14-LPS复合物。在这项研究中,我们在中性粒细胞中发现了一种新型剪接变体,命名为CD 14-SV,其特征是与CD 14参考mRNA序列相比,缺失了c.143-579 nt的区域。此外,在CD 14的外显子2的单核苷酸多态性(c.523 A>G)被确定,并发现修改的二级结构和亲水性的CD 14蛋白。关联分析还表明,牛奶体细胞评分,乳房炎的指标,与GG基因型的奶牛低于与AA和AG基因型的奶牛。我们的研究结果表明,CD 14在牛血中性粒细胞的表达是受选择性剪接,和CD 14-SV是一个候选的功能标记,可能会影响乳腺炎的奶牛抗性。
Polymorphonuclear neutrophil (PMN) leukocytes are primary phagocytic cells of the bovine mammary gland and a first line of defense against invading pathogens during bovine mastitis infection. Cluster of differentiation 14 (CD14) is mainly expressed in macrophages and neutrophils and acts as a co-receptor that binds bacterial lipopolysaccharide (LPS) and recruits PMNs to CD14-LPS complexes in mammary epithelial cells. In this study, we identified a novel splice variant in PMNs, named CD14-SV, characterized by a deleted region from c.143-579 nt compared to the CD14 reference mRNA sequence. Moreover, a single nucleotide polymorphism (c.523 A>G) in exon 2 of CD14 was identified and found to modify the secondary structure and hydrophilicity of the CD14 protein. Association analysis also showed that the milk somatic cell score, an indicator of mastitis, of cows with the GG genotype was lower than that of cows with the AA and AG genotypes. Our findings suggest that the expression of CD14 in bovine blood PMNs is regulated by alternative splicing, and that CD14-SV is a candidate functional marker that may influence mastitis-resistance in dairy cows.
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