Spatiotemporal expression patterns of clusterin in the mouse inner ear

Area of Science:

• Cell Biology
• Neuroscience
• Otolaryngology

Background:

• Clusterin (CLU) is an extracellular chaperone protein involved in cellular stress responses, neurodegenerative diseases, and cancer.
• CLU protects cells by clearing debris and misfolded proteins, and regulates pro-survival pathways.
• Hearing loss results from genetic factors and external insults like ototoxic drugs, noise, and aging.

Purpose of the Study:

• To investigate the role of Clusterin (CLU) in the inner ear by analyzing its expression patterns during mouse development and in adulthood.
• To explore CLU's potential cytoprotective function against hearing loss.

Main Methods:

• Quantitative real-time polymerase chain reaction (qRT-PCR) to measure Clu mRNA levels.
• In situ hybridization and immunofluorescence staining to determine spatial expression of Clu mRNA and protein.
• Analysis across various developmental stages of the mouse inner ear.

Main Results:

• Clu mRNA levels increased during embryogenesis and remained constant in adult mouse inner ears.
• Clu expression was detected in specific developing inner ear domains, particularly near the cochlear prosensory domain.
• In mature inner ears, Clu was found in Deiter's cells, pillar cells, outer sulcus, and stria vascularis basal cells.

Conclusions:

• The spatiotemporal expression patterns of Clusterin (CLU) in the mouse inner ear suggest its involvement in inner ear development.
• CLU may play a role in maintaining proper hearing function throughout life.