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Meibomian gland dysfunction: hyperkeratinization or atrophy?

James V Jester1, Geraint J Parfitt2, Donald J Brown3

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Meibomian gland dysfunction (MGD), a cause of evaporative dry eye disease (EDED), may be driven by gland atrophy rather than hyperkeratinization. Mouse models show age-related gland loss and plugging, suggesting atrophy as a key factor in EDED.

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Area of Science:

  • Ophthalmology
  • Dry Eye Disease Research
  • Meibomian Gland Research

Background:

  • Meibomian gland dysfunction (MGD) is the primary cause of evaporative dry eye disease (EDED).
  • Current understanding suggests MGD involves ductal hyperkeratinization, plugging, and obstruction.
  • This review re-evaluates the role of hyperkeratinization in MGD using recent mouse model findings.

Purpose of the Study:

  • To re-evaluate the mechanistic role of hyperkeratinization in Meibomian gland dysfunction (MGD).
  • To investigate age-related changes and responses to desiccating stress in mouse meibomian glands.
  • To compare findings in mouse models with clinical observations of evaporative dry eye disease (EDED).

Main Methods:

  • Analysis of eyelids from young, old, and desiccating stress-exposed mice.
  • Immunofluorescent tomography and 3D reconstruction to assess gland volume and hyperkeratinization markers.
  • Stimulated Raman scattering (SRS) microscopy to evaluate lipid quality within meibomian glands.

Main Results:

  • Aging mice exhibited meibomian gland dropout, reduced gland volume, and anterior mucocutaneous junction migration.
  • Atrophic glands showed orifice plugging but lacked hyperkeratinization.
  • Desiccating stress induced meibomian gland hyperproliferation and ductal dilation, altering lipid composition with increased protein content.

Conclusions:

  • Age-related changes in mouse meibomian glands mirror clinical MGD findings, suggesting gland atrophy is a major cause of EDED.
  • Hyperkeratinization does not appear to be a primary factor in age-related MGD.
  • Environmental factors like desiccating stress may exacerbate age-related changes in meibomian glands.