Related Experiment Video
Updated: Aug 1, 2026
12:29
Primary Culture and Plasmid Electroporation of the Murine Organ of Corti.
Published on: February 4, 2010
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.
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.
- 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.
Related Concept Videos
01:15Differentiation of Common Myeloid Progenitor Cells
Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
01:16TGF - β Signaling Pathway
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...