Int J Biol Sci 2020; 16(2):251-263. doi:10.7150/ijbs.38214

Research Paper

LRRC75A antisense lncRNA1 knockout attenuates inflammatory responses of bovine mammary epithelial cells

Xixi Wang*, Hao Wang*, Ruiqi Zhang, Dan Li, Ming-Qing Gao

College of Veterinary Medicine, Northwest A&F University, Yangling 712100, China.
*These authors contributed equally to this work.

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Wang X, Wang H, Zhang R, Li D, Gao MQ. LRRC75A antisense lncRNA1 knockout attenuates inflammatory responses of bovine mammary epithelial cells. Int J Biol Sci 2020; 16(2):251-263. doi:10.7150/ijbs.38214. Available from

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Long noncoding RNAs (lncRNAs) play multiple key roles during inflammatory processes. In this study, a novel lncRNA identified by the high-throughput sequencing analysis was found significantly down-regulated in Escherichia coli-introduced cell model of bovine mastitis. Given that this lncRNA consists of the antisense of leucine-rich repeat-containing protein 75A (LRRC75A), it was named LRRC75A antisense lncRNA1 (LRRC75A-AS1). The expression of LRRC75A-AS1 was down-regulated in bovine mammary epithelial cells and mammary tissues under inflammatory condition. Knockout (KO) of LRRC75A-AS1 by CRISPR-Cas9 system in bovine mammary alveolar cell-T (MAC-T) cell line could enhance expressions of tight junction (TJ) proteins Claudin-1, Occludin and ZO-1, reduce cell monolayer permeability, and inhibit Staphylococcus aureus adhesion and invasion. Meanwhile, it also down-regulated expressions of inflammatory factors and attenuated activation of NF-κB pathway. Similarly, knockdown of LRRC75A caused the changes as LRRC75A-AS1 KO did, while overexpression of LRRC75A enabled the opposite effects. TJ of epithelioid cells barriers the pathogenic microorganisms outside during inflammation, in which LRRC75A-AS1 can regulate the expression of TJ proteins through LRRC75A, affecting the development of inflammation.

Keywords: bovine mammary epithelial cell, lncRNA, LRRC75A-AS1, LRRC75A, bovine mastitis