LINC02605 involved in paediatric Mycoplasma pneumoniae pneumonia complicated with diarrhoea via miR-539-5p/CXCL1 axis.

Background: To investigate the involvement of LINC02605 in the progression of paediatric Mycoplasma pneumoniae pneumonia (MPP).

Methods: One hundred and thirty-two children with MPP (90 simple MPP and 42 MPP + diarrhoea) were enrolled, and their plasma was collected for detection of LINC026505 expression. CCK-8 kit and commercial apoptosis kit were introduced to determine cell growth and apoptosis. In silico prediction analyses were conducted to predict the downstream miRNA for LINC02605, following verification by dual luciferase reporter assay. The lipid-associated membrane proteins (LAMPs) were used to treat A549 and Coca-2 cells.

Results: LIN02605 was highly expressed in the MPP, especially in MPP complicated with diarrhoea. LINC02605 downregulation in A549 cells correlated with significant suppression of cell apoptosis rate and growth inhibition rate in vitro. Introduction of miR-539-5p inhibited luciferase activity in a reporter system containing the wild-type LINC02605 and CXCL1. After stimulation with LAMPs, overexpression of LINC02605 and CXCL1 and inhibition of miR-539-5p were found. miR-539-5p and CXCL1 knockdown resulted in a rescue effect on the LINC02605-inhibited cell apoptosis. LAMPs induced IL-1β in intestinal epithelial cells and IL-1β induced LINC02605 expression in A549 cells.

Conclusions: LINC02605 was upregulated in MPP and miR-539-5p was a target for LINC02605. LINC02605 may be involved in the crosstalk between the gastrointestinal tract and the respiratory tract.