3-D analysis of F-actin in stereocilia of cochlear hair cells after loud noise exposure

Gopal B. Avinash, Alfred Nuttall, Yehoash Raphael

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Fluorescence microscopy can be a useful tool in the early detection of pathological changes in the stereocilia of outer hair cells which have undergone acoustic overstimulation. Fluorescent phalloidin, a highly specific F-actin stain, can be used to label F-actin in stereocilia. In this study, phalloidin label is used to determine quantitative changes of F-actin in the stereocilia of guinea pigs exposed to loud noise (117 dB; octave band noise, centered at 1 kHz; 4 h). Reliably determining three-dimensional (3-D) structural changes in stereocilia is a challenging problem in optical microscopy since stereocilia diameter is close to the optical resolution limit. In order to alleviate the problem, a computational 3-D microscopy technique is used (Avinash et al., 1992). Whole-mounts of the cochlear second and third turns were examined in a Leitz Orthoplan microscope through a Leitz Plan Apo objective lens (100 ×; 1.32 N.A.; 170 0.17). Images were acquired with a charge-coupled device camera where the focus was shifted in 0.2 μm steps using a piezoelectric translator. Images were processed with the appropriate point spread function of the optical system. Analysis of control cochleas indicate that our technique can resolve single stereocilia and distinguish between various intensities of label along each stereocilia. In noise-exposed cochleas, our data show length and intensity changes in the phalloidin label. These results suggest that both depolymerization and polymerization of F-actin can occur in stereocilia of outer hair cells after acoustic overstimulation. Our findings demonstrate the applicability of computational 3-D microscopy to quantitative and qualitative analysis of stereocilia.

Original languageEnglish (US)
Pages (from-to)139-146
Number of pages8
JournalHearing Research
Volume67
Issue number1-2
DOIs
StatePublished - 1993
Externally publishedYes

Fingerprint

Auditory Hair Cells
Stereocilia
Noise
Actins
Outer Auditory Hair Cells
Phalloidine
Cochlea
Microscopy
Acoustics
Optical Devices
Fluorescence Microscopy
Polymerization
Lenses
Guinea Pigs
Coloring Agents

Keywords

  • 3-D optical microscopy
  • Cochlear hair cell
  • Image processing, F-actin
  • Loud noise
  • Stereocilia

ASJC Scopus subject areas

  • Sensory Systems

Cite this

3-D analysis of F-actin in stereocilia of cochlear hair cells after loud noise exposure. / Avinash, Gopal B.; Nuttall, Alfred; Raphael, Yehoash.

In: Hearing Research, Vol. 67, No. 1-2, 1993, p. 139-146.

Research output: Contribution to journalArticle

Avinash, Gopal B. ; Nuttall, Alfred ; Raphael, Yehoash. / 3-D analysis of F-actin in stereocilia of cochlear hair cells after loud noise exposure. In: Hearing Research. 1993 ; Vol. 67, No. 1-2. pp. 139-146.
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