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Related Experiment Videos

Early cellular events in evolving cutaneous delayed hypersensitivity in humans.

H A Waldorf1, L J Walsh, N M Schechter

  • 1Duhring Dermatologic Research Laboratories, University of Pennsylvania, Philadelphia 19104.

The American Journal of Pathology
|February 1, 1991
PubMed
Summary

Early skin inflammation involves mast cell degranulation and specific adhesion molecule expression. Memory T-cells migrate into hair follicles, initiating the delayed-type hypersensitivity reaction (DHR) before visible skin lesions appear.

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Area of Science:

  • Immunology
  • Dermatology
  • Cell Biology

Background:

  • Delayed-type hypersensitivity reaction (DHR) is a key model for inflammatory skin diseases.
  • The precise cellular events initiating DHR remain poorly understood.

Purpose of the Study:

  • To investigate early cellular events and adhesion molecule expression during DHR.
  • To identify key cellular interactions preceding visible skin lesion formation in DHR.

Main Methods:

  • Evaluation of inflammatory cell populations and adhesion molecule expression in human skin.
  • Induction of DHR using 2,4-dinitrochlorobenzene (DNCB).
  • Analysis of endothelial leukocyte adhesion molecule (ELAM-1) and intercellular adhesion molecule-1 (ICAM-1) expression.

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Main Results:

  • Mast cell degranulation observed within 1 hour of DHR induction.
  • Endothelial leukocyte adhesion molecule (ELAM-1) expression initiated at 2 hours, peaking at 24 hours.
  • Intrafollicular T-cell migration, predominantly CD4-positive memory T-cells, occurred by 4 hours, independent of ICAM-1.

Conclusions:

  • Mast cell degranulation and ELAM-1 expression are early events in cutaneous DHR.
  • Memory T-cell migration into hair follicles is a critical early step in DHR development.
  • These subclinical events precede gross inflammatory lesion formation in DHR.