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Immunobiology of the serine protease allergens from house dust mites

G A Stewart1, S M Boyd, C H Bird

  • 1Western Australian Research Institute for Child Health, Perth.

American Journal of Industrial Medicine
|January 1, 1994
PubMed

Insights

House dust mites Dermatophagoides pteronyssinus and D. farinae possess serine proteases like trypsin and elastase. These mite enzymes can increase vascular permeability and trigger mast cell degranulation, potentially contributing to allergic responses.

Area of Science:

  • Biochemistry
  • Immunology
  • Molecular Biology

Background:

  • House dust mites (Dermatophagoides pteronyssinus and D. farinae) are common allergens.
  • Mite-derived enzymes are implicated in allergic inflammation and immune responses.

Purpose of the Study:

  • To identify and characterize serine proteases from Dermatophagoides mite extracts.
  • To investigate the biological activities of these mite proteases, focusing on their role in immune cell activation and tissue effects.

Main Methods:

  • Protease extraction from Dermatophagoides mite whole body and fecal extracts.
  • Enzyme characterization including charge heterogeneity analysis.
  • Assays for vascular permeability induction.
  • Tissue culture studies for cell detachment.
  • Rat mast cell degranulation assays (non-IgE mediated).

Main Results:

  • Multiple 30 kDa serine proteases, including trypsin, chymotrypsin, and elastase-like enzymes, were identified.
  • Mite trypsin exhibited charge heterogeneity, distinct from other identified proteases.
  • Enzymes were more concentrated in fecal extracts.
  • Mite proteases induced vascular permeability and cell detachment in vitro.
  • Mite elastase triggered non-IgE mediated mast cell degranulation.

Conclusions:

  • Dermatophagoides mite extracts contain potent serine proteases with significant biological activities.
  • These enzymes, particularly mite elastase, can directly activate mast cells and disrupt tissue barriers.
  • The identified protease activities provide a molecular basis for mite-induced immunogenicity and allergic inflammation.

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