Related Experiment Video
Updated: Jul 9, 2026
Experimental Autoimmune Uveitis: An Intraocular Inflammatory Mouse Model
Published on: January 12, 2022
[Animal model of experimental autoimmune inner ear disease induced by P0 protein purified from inner ear]
Xi Lin1, Qing Cheng, Jibao Wang
1Department of Otorhinolaryngology, the First Affiliated Hospital, Fujian Medical University, Fuzhou, 350005, China.
Objective:
To purify P0 protein from guinea pig's inner ear by preparative SDS-PAGE and to study the possible role it may play in the etiology of autoimmune inner ear disease.
Method:
A mixture of membraneous proteins of inner ear was separated by preparative SDS-PAGE. The corresponding band at 30,000 was cut and electrically eluted. The protein collected was identified by analytical SDS-PAGE and Western blot assay. A group of 20 guinea pigs were immunized with P0 protein emulsified in complete Freunds adjuvant, another 10 guinea pigs were immunized with complete Freunds adjuvant only as control. The guinea pigs' hearing thresholds, serum IgG level and morphological changes in the inner ear were investigated. The distribution of P0 protein in the cochlear was detected by immunohistochemical technique.
Result:
The purity of the protein was demonstrated by a single band at the 30000 site in SDS-PAGE, which was identified as P0 protein by western blot analysis assay. About 17.5% P0-immunized guinea pigs showed increased hearing thresholds, elevated IgG level (F = 6.48, P<0.01), as well as a decreased number of spiral ganglion cells and inflammatory cell infiltration in the cochlear nerve region. The P0 protein is distributed in the cochlear nerve and spiral ganglion only.
Conclusion:
P0 protein from guinea pigs in ner ear can be successfully purified by preparative SDS-PAGE and an animal model of experimental autoimmune inner ear disease induced by P0 protein was successfully established.
Insights
Researchers purified P0 protein from guinea pig inner ears and established an animal model for autoimmune inner ear disease. This P0 protein immunization led to hearing loss and cochlear changes in guinea pigs.
Area of Science:
- Otorhinolaryngology
- Immunology
- Neuroscience
Context:
- Autoimmune inner ear disease (AIED) is a debilitating condition with unclear etiology.
- The P0 protein, a major component of the myelin sheath in the inner ear, is a potential autoantigen in AIED.
Purpose:
- To purify P0 protein from guinea pig inner ear using preparative SDS-PAGE.
- To investigate the role of P0 protein in the development of autoimmune inner ear disease by establishing an animal model.
Summary:
- P0 protein was successfully purified and identified from guinea pig inner ear membranes via SDS-PAGE and Western blot.
- Immunization with purified P0 protein in guinea pigs induced experimental autoimmune inner ear disease, characterized by increased hearing thresholds, elevated IgG levels, and cochlear pathology.
- P0 protein was localized to the cochlear nerve and spiral ganglion.
Impact:
- This study successfully established an animal model for AIED, providing a valuable tool for further research into disease mechanisms and therapeutic strategies.
- The findings implicate P0 protein as a key factor in the pathogenesis of autoimmune inner ear disease.
