Cited by 236Hearing, Cochlea, Tinnitus, GeneticsBarrier Structure and Function StudiesVestibular and auditory disorders

Perivascular-resident macrophage-like melanocytes in the inner ear are essential for the integrity of the intrastrial fluid–blood barrier

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Zhang, Wenjing, Dai, Min, Fridberger, Anders, Hassan, Ahmed, DeGagne, Jacqueline, Neng, Lingling, Zhang, Fei, He, Wenxuan +4 more·2012·Proceedings of the National Academy of Sciences

Abstract

The microenvironment of the cochlea is maintained by the barrier between the systemic circulation and the fluids inside the stria vascularis. However, the mechanisms that control the permeability of the intrastrial fluid–blood barrier remain largely unknown. The barrier comprises endothelial cells connected to each other by tight junctions and an underlying basement membrane. In a recent study, we found that the intrastrial fluid–blood barrier also includes a large number of perivascular cells with both macrophage and melanocyte characteristics. The perivascular-resident macrophage-like melanocytes (PVM/Ms) are in close contact with vessels through cytoplasmic processes. Here we demonstrate that PVM/Ms have an important role in maintaining the integrity of the intrastrial fluid–blood barrier and hearing function. Using a cell culture-based in vitro model and a genetically induced PVM/M-depleted animal model, we show that absence of PVM/Ms increases the permeability of the intrastrial fluid–blood barrier to both low- and high-molecular-weight tracers. The increased permeability is caused by decreased expression of pigment epithelial-derived factor, which regulates expression of several tight junction-associated proteins instrumental to barrier integrity. When tested for endocochlear potential and auditory brainstem response, PVM/M-depleted animals show substantial drop in endocochlear potential with accompanying hearing loss. Our results demonstrate a critical role for PVM/Ms in regulating the permeability of the intrastrial fluid–blood barrier for establishing a normal endocochlear potential hearing threshold.

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  • In humans, low eumelanin indicated by light eye color and skin sunlight sensitivity correlates with less inner ear melanin, more temporary hearing loss after loud sounds, and noise-induced deafness.

    “A human marker for low eumelanin (light eye color) and sunlight sensitivity of skin correlate with reduced inner ear melanin, greater temporary hearing loss after loud sounds, and noise-induced deafness (188, 184, 189, 190).”

    From Chemiexcitation: Mammalian Photochemistry in the Dark<sup>†</sup> (2023) · cites this paper as [188]

    The Discussion reports hearing loss after depletion of inner-ear melanocyte-like cells in mice, supporting a general connection between these cells and hearing. It does not report human correlations involving eye color, sunlight sensitivity, inner-ear melanin, temporary hearing loss after loud sounds, or noise-induced deafness (pages unavailable in our copy). (LLM, conf=0.77)

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Authors
Zhang, W., Dai, M., Fridberger, A., Hassan, A., DeGagne, J., Neng, L., Zhang, F., He, W., Ren, T., Trune, D., Auer, M., & Shi, X.
Affiliations
  • Oregon Health & Science University (US)
  • Karolinska Institutet (SE)
  • Lawrence Berkeley National Laboratory (US)
Venue
Proceedings of the National Academy of Sciences
Published
2012-06-11
Volume
109
Issue
26
Pages
10388-10393
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W1988390197
Cited by
236
References
35
Citations by year
2026: 14 · 2025: 19 · 2024: 22 · 2023: 24 · 2022: 22 · 2021: 20 · 2020: 21 · 2019: 16 · 2018: 13 · 2017: 24 · 2016: 7 · 2015: 14 · 2014: 12 · 2013: 6 · 2012: 2
FWCI
6.03
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Israel National Institute for Health Policy Research
  • National Institutes of Health (DC005983)
  • National Institute on Deafness and Other Communication Disorders (R01DC004554, NIH P30 DC005983, DC005983, R01DC010844, R03DC008888, DC008888-02A1, P30DC005983, DC 008888-02S1)
Topics
  • Life Sciences › Neuroscience › Sensory Systems › Hearing, Cochlea, Tinnitus, Genetics
  • Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
  • Life Sciences › Neuroscience › Neurology › Vestibular and auditory disorders
Keywords
inner ear, stria vascularis, pigment epithelium-derived factor, tight junctions, endocochlear potential, hearing loss, cochlea, pericytes, basement membrane
MeSH terms
Animals, Humans, Ear, Inner, Macrophages, Melanocytes, Mice, Transgenic, Stria Vascularis, Tight Junctions, Mice

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