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Related Experiment Videos

Dystroglycan expression in the mouse cochlea.

Denise LaMarche Heaney1, Bradley A Schulte

  • 1Department of Pathology, Medical University of South Carolina, 171 Ashley Avenue, Charleston, SC 29425, USA. lamarche@musc.edu

Hearing Research
|March 6, 2003
PubMed
Summary

Dominant spotting mice with a c-kit mutation show altered dystroglycan expression in the cochlea. These findings suggest intermediate cells play a role in maintaining strial capillary basement membrane health.

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Area of Science:

  • Oto-genetics
  • Cellular Biology
  • Neuroscience

Background:

  • Viable dominant spotting (W(v)/W(v)) mice possess a c-kit gene mutation impacting neural crest cell migration to the cochlea, crucial for intermediate cell (IC) development.
  • A shared pathology between these mutants and aging cochleae (human, gerbil) is basement membrane (BM) thickening in strial capillaries.
  • Aging gerbil cochlear strial capillary atrophy correlates with altered dystroglycan (DG) expression, a key regulator of BM assembly.

Purpose of the Study:

  • To investigate the role of intermediate cells (ICs) in regulating strial capillary basement membrane (BM) homeostasis.
  • To evaluate dystroglycan (DG) expression in W(v)/W(v) mutant mice compared to wild-type controls.

Main Methods:

  • Reverse transcription-polymerase chain reaction (RT-PCR) to detect DG gene product in cochlear lateral walls.

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  • Immunohistochemistry using subunit-specific antibodies to localize alpha- and beta-DG subunits.
  • Microscopic analysis of DG expression patterns in relation to strial capillary integrity and IC presence.

    • Main Results:

    • DG gene product was detected in both W(v)/W(v) and wild-type mice.
    • Alpha-DG was found alone in some sites, while alpha- and beta-DG co-localized in others, including the strial capillary BM.
    • Loss of alpha-DG staining correlated with strial degeneration, and altered DG expression in strial capillaries corresponded with capillary atrophy in IC-deficient areas.

    Conclusions:

    • Intermediate cells (ICs) may play a role in maintaining the strial capillary basement membrane (BM) homeostasis.
    • Dystroglycan (DG) expression patterns are altered in W(v)/W(v) mice, linking ICs to strial capillary health.
    • Further research is warranted to elucidate the precise mechanisms of IC involvement in cochlear vascular integrity.