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Cluster Analysis Characterising the 3D Spatial Configuration of Human Epidermal Merkel Cells.

Saito Sakaguchi1, Ayumi Kikuchi1, Kentaro Kajiya1

  • 1MIRAI Technology Institute, Shiseido Co. Ltd., Yokohama, Japan.

Experimental Dermatology
|January 21, 2026
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Summary

Merkel cells (MCs) form distinct skin clusters regardless of density. This study reveals heterogeneous MC distribution patterns, offering new insights into skin physiology and tactile perception.

Keywords:
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Area of Science:

  • Dermatology
  • Cell Biology
  • Neuroscience

Background:

  • Merkel cells (MCs) are skin mechanoreceptors crucial for tactile perception.
  • MCs are known to distribute in clusters or be scattered, but their spatial patterns are not fully understood.
  • Conventional skin section studies limit the assessment of MC structural characteristics and distribution.

Purpose of the Study:

  • To investigate the three-dimensional distribution and clustering patterns of Merkel cells in human skin.
  • To analyze how Merkel cell density and intercellular distances correlate with their spatial organization.
  • To explore variations in Merkel cell distribution across different age groups.

Main Methods:

  • Extensive three-dimensional observations of Merkel cells in epidermal sheets.
  • Analysis of Merkel cell clustering patterns based on intercellular distances.
  • Examination of skin specimens from female donors across a wide age range (27-91 years).

Main Results:

  • Merkel cell density varied significantly (6.7 to 26.4 mm⁻²) among donors.
  • Skin with the lowest MC density exhibited clustering patterns similar to skin with the highest density.
  • Inter-donor variations in MC distribution are characterized by heterogeneous patterns, not just density changes.

Conclusions:

  • Merkel cell distribution is not solely determined by density but involves complex spatial configurations.
  • Distinct clustering patterns suggest underlying regulatory mechanisms influencing Merkel cell arrangement.
  • Understanding Merkel cell spatial organization is vital for insights into skin physiology and pathology.