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Differential response of gel-forming mucins to pathogenic middle ear bacteria. Int J Pediatr Otorhinolaryngol 2014 Aug;78(8):1368-73

Date

06/25/2014

Pubmed ID

24958163

Pubmed Central ID

PMC4104932

DOI

10.1016/j.ijporl.2014.05.037

Scopus ID

2-s2.0-84904036054   15 Citations

Abstract

OBJECTIVE: To assess the differential response of the secretory gel forming mucins (GFM) to the most common bacterial pathogens causing otitis media, Streptococcus pneumoniae (SP), nontypeable Haemophilus influenza (NTHi), and Moraxella catarrhalis (Mcat), in a culture model of human middle ear epithelium (HMEEC).

METHODS: In vitro cultured HMEEC was exposed to 5 μg/ml of bacterial whole cell lysate (WCL). RNA was extracted to generate cDNA. The expression levels of each of the targeted mucin transcripts, MUC2, MUC5AC, MUC5B and MUC19, were detected by quantitative PCR.

RESULTS: The submerged HMEEC exposed to NTHi-86028NP WCL demonstrated a significant increase of MUC2, MUC5AC and MUC5B as compared to the control non-treated cells while MUC19 transcript level remained unchanged. WCL of additional major OM pathogens significantly increase the transcription of these three mucin genes as well. A combination of NTHi and SP further synergistically induced MUC2 and MUC5AC gene expression however, not all NTHi strains synergized with SP in the induction. Addition of Mcat WCL to the synergized combination of NTHi and SP did not participate in the synergistic response of mucins.

CONCLUSION: The specific pathogen combinations were important in determining the degree of synergistic effects to GFM expression. The current data are substantive in guiding future work to extend our understanding of OM pathogens and GFMs.

Author List

Kerschner JE, Hong W, Khampang P, Johnston N

Authors

Wenzhou Hong DVM, PhD Assistant Professor in the Otolaryngology department at Medical College of Wisconsin
Nikki Johnston PhD Associate Professor in the Otolaryngology department at Medical College of Wisconsin
Joseph E. Kerschner MD Provost, Executive Vice President, Dean, Professor in the School of Medicine Administration department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Bacterial Proteins
Cells, Cultured
Ear, Middle
Epithelial Cells
Gels
Haemophilus influenzae
Humans
Mucins
Otitis Media
Polymerase Chain Reaction
Streptococcus pneumoniae
Transcription, Genetic
jenkins-FCD Prod-480 9a4deaf152b0b06dd18151814fff2e18f6c05280