Changes in plasma membrane structure and electromotile properties in prestin deficient outer hair cells

David Z. He, Shuping Jia, Takashi Sato, Jian Zuo, Leonardo R. Andrade, Gavin P. Riordan, Bechara Kachar

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Abstract

Cochlear outer hair cells (OHCs) rapidly change their length and stiffness when their membrane potential is altered. Prestin, the motor protein for this electromotility, is present along the OHC lateral plasma membrane where there is a high density of intra-membrane protein particles (IMPs). However, it is not known to what extent prestin contributes to this unusual dense population of proteins and overall organization of the membrane to generate the unique electromechanical response of OHCs. We investigated the relationship of prestin with the IMPs, the underlying cortical cytoskeletal lattice, and electromotility in prestin-deficient mice. Using freezefracture, we observed a reduction in density and size of the IMPs that correlates with the reduction and absence of prestin in the heterozygous and homozygous mice, respectively. We also observed a reduction or absence of electromotilityrelated charge density, axial stiffness, and piezoelectric properties of the OHC. A comparison of the charge density with the number of IMPs suggests that prestin forms tetramers in the wild type but is likely to form lower number oligomers in the prestin-deficient OHCs from the heterozygous mice. Interestingly, the characteristic actin-based cortical cytoskeletal lattice that underlies the membrane is absent in the prestin-null OHCs, suggesting that prestin is also required for recruiting or maintaining the cortical cytoskeletal lattice. These results suggest that the majority of the IMPs are indeed prestin and that electrically evoked length and stiffness changes are interrelated and dependent on both prestin and on the cortical actin cytoskeletal lattice of the OHC lateral membrane.

Original languageEnglish
Pages (from-to)43-55
Number of pages13
JournalCytoskeleton
Volume67
Issue number1
DOIs
StatePublished - 2010

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Outer Auditory Hair Cells
Cell Membrane
Membrane Proteins
Actins
Null Lymphocytes
Membranes
Membrane Potentials
Proteins

All Science Journal Classification (ASJC) codes

  • Cell Biology
  • Structural Biology

Cite this

Changes in plasma membrane structure and electromotile properties in prestin deficient outer hair cells. / He, David Z.; Jia, Shuping; Sato, Takashi; Zuo, Jian; Andrade, Leonardo R.; Riordan, Gavin P.; Kachar, Bechara.

In: Cytoskeleton, Vol. 67, No. 1, 2010, p. 43-55.

Research output: Contribution to journalArticle

He, DZ, Jia, S, Sato, T, Zuo, J, Andrade, LR, Riordan, GP & Kachar, B 2010, 'Changes in plasma membrane structure and electromotile properties in prestin deficient outer hair cells', Cytoskeleton, vol. 67, no. 1, pp. 43-55. https://doi.org/10.1002/cm.20423
He, David Z. ; Jia, Shuping ; Sato, Takashi ; Zuo, Jian ; Andrade, Leonardo R. ; Riordan, Gavin P. ; Kachar, Bechara. / Changes in plasma membrane structure and electromotile properties in prestin deficient outer hair cells. In: Cytoskeleton. 2010 ; Vol. 67, No. 1. pp. 43-55.
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