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Updated: Jul 12, 2025
Initiating Differentiation in Immortalized Multipotent Otic Progenitor Cells
Published on: January 2, 2016
Establishment of novel immortalized middle ear cell lines as models for otitis media
Simon Blaine-Sauer1, Tina L Samuels1, Pawjai Khampang1
1Department of Otolaryngology and Communication Sciences Medical College of Wisconsin Milwaukee Wisconsin USA.
Objective:
Otitis media (OM) is among the most frequently diagnosed pediatric diseases in the US. Despite the significant public health burden of OM and the contribution research in culture models has made to understanding its pathobiology, a singular immortalized human middle ear epithelial (MEE) cell line exists (HMEEC-1, adult-derived). We previously developed MEE cultures from pediatric patients with non-inflamed MEE (PCI), recurrent OM (ROM), or OM with effusion (OME) and demonstrated differences in their baseline inflammatory cytokine expression and response to stimulation with an OM-relevant pathogen lysate and cytokines. Herein, we sought to immortalize these cultures and assess retention of their phenotypes.
Methods:
MEE cultures were immortalized via lentivirus encoding temperature-sensitive SV40 T antigen. Immortalized MEE lines and HMEEC-1 grown in monolayer were stimulated with non-typeable Haemophilus influenzae (NTHi) lysate. Gene expression (TNFA, IL1B, IL6, IL8, MUC5AC, and MUC5B) was assessed by qPCR.
Results:
Similar to parental cultures, baseline cytokine expressions were higher in pediatric OM lines than in HMEEC-1 and PCI, and HMEEC-1 cells were less responsive to stimulation than pediatric lines.
Conclusion:
Immortalized MEE lines retained the inflammatory expression and responsiveness of their tissues of origin and differences between non-OM versus OM and pediatric versus adult cultures, supporting their value as novel in vitro culture models for OM.
Insights
New immortalized pediatric middle ear epithelial cell lines mimic otitis media (OM) disease phenotypes. These models show distinct inflammatory responses, aiding research into pediatric OM.
Area of Science:
- Otolaryngology
- Pediatric Infectious Diseases
- Cell Biology
Background:
- Otitis media (OM) is a common pediatric illness with significant public health impact.
- Existing research models for OM are limited, with only one adult-derived immortalized human middle ear epithelial (MEE) cell line available.
- Previous studies established distinct baseline inflammatory profiles and responses in pediatric MEE cultures from non-inflamed, recurrent OM, and OM with effusion origins.
Purpose of the Study:
- To immortalize pediatric middle ear epithelial (MEE) cell cultures.
- To assess the retention of disease-specific phenotypes in immortalized MEE lines.
- To establish novel in vitro models for studying otitis media.
Main Methods:
- MEE cultures were immortalized using lentivirus encoding temperature-sensitive SV40 T antigen.
- Immortalized MEE lines and the HMEEC-1 cell line were stimulated with non-typeable *Haemophilus influenzae* (NTHi) lysate.
- Gene expression of key inflammatory and mucin genes (TNFA, IL1B, IL6, IL8, MUC5AC, MUC5B) was quantified using qPCR.
Main Results:
- Immortalized pediatric OM lines exhibited higher baseline cytokine expression compared to HMEEC-1 and pediatric non-inflamed (PCI) cultures.
- HMEEC-1 cells demonstrated reduced responsiveness to NTHi stimulation compared to pediatric MEE lines.
- The immortalized lines preserved the inflammatory expression patterns and responsiveness characteristic of their original tissue sources.
Conclusions:
- Immortalized MEE cell lines successfully retained the inflammatory phenotypes of their tissue of origin.
- These novel cell lines preserve differences between non-OM and OM, as well as pediatric and adult MEE.
- The developed immortalized MEE lines serve as valuable in vitro models for otitis media research.
