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Transforming growth factor beta expression during an inner ear immune response.

Hitoshi Satoh¹, Peter Billings, Gary S Firestein

¹Division of Otolaryngology-Head and Neck Surgery, University of California San Diego, USA.

The Annals of Otology, Rhinology, and Laryngology

|February 10, 2006

Summary

Transforming growth factor beta (TGF-beta) activation occurs early in cochlear immune responses, decreasing as the response resolves. This suggests early intervention may prevent cochlear fibrosis.

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Area of Science:

Inner ear immunology
Fibrosis research

Background:

Transforming growth factor beta (TGF-beta) is a key mediator of fibrogenesis.
The role of TGF-beta in cochlear immune responses and fibrosis is not well understood.

Purpose of the Study:

To investigate the involvement of TGF-beta during cochlear immune responses.
To determine the temporal expression of TGF-beta and latency-associated peptide (LAP) in the cochlea during an adaptive immune response.

Main Methods:

An adaptive immune response to antigen was induced in mice.
Cochleas were analyzed using immunocytochemistry for TGF-beta and LAP at various time points (3-48 hours and 7 days post-initiation).

Main Results:

LAP was detected in normal cochleas, while TGF-beta was found in inflammatory cells early (3 hours) after antigen challenge.

Related Experiment Videos

A rapid decrease in LAP and increase in TGF-beta expression indicated TGF-beta activation during the immune response.

These changes persisted for 48 hours before returning to normal by 7 days.

Conclusions:

TGF-beta activation is an early event in cochlear adaptive immune responses.
The findings suggest that cochlear fibrosis initiates early in the immune response.
Targeted treatment during the early phase may prevent cochlear fibrosis.