ORMDL3 regulates poly I:C induced inflammatory responses in airway epithelial cells.
BMC Pulm Med
; 21(1): 167, 2021 May 17.
Article
in En
| MEDLINE
| ID: mdl-34001091
ABSTRACT
BACKGROUND:
Oroscomucoid 3 (ORMDL3) has been linked to susceptibility of childhood asthma and respiratory viral infection. Polyinosinic-polycytidylic acid (poly IC) is a synthetic analog of viral double-stranded RNA, a toll-like receptor 3 (TLR3) ligand and mimic of viral infection.METHODS:
To investigate the functional role of ORMDL3 in the poly IC-induced inflammatory response in airway epithelial cells, ORMDL3 knockdown and over-expression models were established in human A549 epithelial cells and primary normal human bronchial epithelial (NHBE) cells. The cells were stimulated with poly IC or the Th17 cytokine IL-17A. IL-6 and IL-8 levels in supernatants, mRNA levels of genes in the TLR3 pathway and inflammatory response from cell pellets were measured. ORMDL3 knockdown models in A549 and BEAS-2B epithelial cells were then infected with live human rhinovirus (HRV16) followed by IL-6 and IL-8 measurement.RESULTS:
ORMDL3 knockdown and over-expression had little influence on the transcript levels of TLR3 in airway epithelial cells. Time course studies showed that ORMDL3-deficient A549 and NHBE cells had an attenuated IL-6 and IL-8 response to poly IC stimulation. A549 and NHBE cells over-expressing ORMDL3 released relatively more IL-6 and IL-8 following poly IC stimulation. IL-17A exhibited a similar inflammatory response in ORMDL3 knockdown and over-expressing cells, but co-stimulation of poly IC and IL-17A did not significantly enhance the IL-6 and IL-8 response. Transcript abundance of IFNB following poly IC stimulation was not significantly altered by ORMDL3 knockdown or over-expression. Dampening of the IL-6 response by ORMDL3 knockdown was confirmed in HRV16 infected BEAS-2B and A549 cells.CONCLUSIONS:
ORMDL3 regulates the viral inflammatory response in airway epithelial cells via mechanisms independent of the TLR3 pathway.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Bronchi
/
Virus Diseases
/
Poly I-C
/
Epithelial Cells
/
Toll-Like Receptor 3
/
Membrane Proteins
Type of study:
Prognostic_studies
Limits:
Humans
Language:
En
Journal:
BMC Pulm Med
Year:
2021
Type:
Article
Affiliation country:
United kingdom