PUBLICATION

Defective calmodulin-dependent rapid apical endocytosis in zebrafish sensory hair cell mutants

Authors
Seiler, C. and Nicolson, T.
ID
ZDB-PUB-991102-19
Date
1999
Source
Journal of neurobiology   41(3): 424-434 (Journal)
Registered Authors
Nicolson, Teresa
Keywords
sensory hair cells; endocytosis; FM1-43; ototoxicity; zebrafish
MeSH Terms
  • Acridine Orange/analysis
  • Amiloride/pharmacology
  • Animals
  • Calcium/metabolism
  • Calmodulin/antagonists & inhibitors
  • Calmodulin/physiology*
  • Diuretics/pharmacology
  • Dopamine Antagonists/pharmacology
  • Endocytosis/drug effects
  • Endocytosis/genetics*
  • Fluorescent Dyes/analysis
  • Hair Cells, Auditory/drug effects
  • Hair Cells, Auditory/physiology*
  • Hair Cells, Auditory/ultrastructure
  • Mechanoreceptors/drug effects
  • Mechanoreceptors/physiology*
  • Mechanoreceptors/ultrastructure
  • Mutation/genetics
  • Protein Synthesis Inhibitors/pharmacology
  • Pyridinium Compounds/analysis
  • Quaternary Ammonium Compounds/analysis
  • Rhodamines/analysis
  • Streptomycin/pharmacology
  • Trifluoperazine/pharmacology
  • Zebrafish/anatomy & histology*
  • Zebrafish/embryology
  • Zebrafish/physiology
PubMed
10526320 Full text @ J. Neurobiol.
Abstract
Vertebrate mechanosensory hair cells contain a narrow "pericuticular" zone which is densely populated with small vesicles between the cuticular plate and cellular junctions near the apical surface. The presence of many cytoplasmic vesicles suggests that the apical surface of hair cells has a high turnover rate. The significance of intense membrane trafficking at the apical surface is not known. Using a marker of endocytosis, the styryl dye FM1-43, this report shows that rapid apical endocytosis in zebrafish lateral line sensory hair cells is calcium and calmodulin dependent and is partially blocked by the presence of amiloride and dihydrostreptomycin, known inhibitors of mechanotransduction channels. As seen in lateral line hair cells, sensory hair cells within the larval otic capsule also exhibit rapid apical endocytosis. Defects in internalization of the dye in both lateral line and inner ear hair cells were found in five zebrafish auditory/vestibular mutants: sputnik, mariner, orbiter, mercury, and skylab. In addition, lateral line hair cells in these mutants were not sensitive to prolonged exposure to streptomycin, which is toxic to hair cells. The presence of endocytic defects in the majority of zebrafish mechanosensory mutants points to a important role of apical endocytosis in hair cell function.
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