Clin Exp Otorhinolaryngol.  2009 Dec;2(4):175-180. 10.3342/ceo.2009.2.4.175.

Th2 Responses Elicited by Nasal Epithelial Cells Exposed to House Dust Mite Extract

Affiliations
  • 1Department of Otorhinolaryngology, Catholic University of Daegu School of Medicine, Daegu, Korea. hsseung@cu.ac.kr

Abstract


OBJECTIVES
Respiratory epithelial cells are the first site of interaction of allergens with the immune system. The aim of this study was to examine the effect of epithelial cells, which were stimulated with house dust mite (HDM) extracts, on the immune response of peripheral blood mononuclear cells (PBMCs). METHODS: Primary nasal polyp epithelial cells were exposed to dermatophagoides pteronyssinus and dermatophagoides farina for 48 hr, and then the supernatant and cells were collected. After stimulation with HDM extract, the epithelial cells were co-cultured with PBMCs for 72 hr and then the supernatant was collected. We measured the interleukin (IL)-8 and granulocyte-macrophage colony stimulating factor to determine the activation of the epithelial cells. The tumor necrosis factor (TNF)-alpha, IL-5 and interferon-gamma were measured to evaluate the interaction between the epithelial cells and the PBMCs. The mRNA expression of intercellular adhesion molecule 1 (ICAM-1) was assessed using the anti-ICAM-1 antibody. RESULTS: The HDM extracts activated the nasal epithelial cells and enhanced the expression of ICAM-1 mRNA and cell membrane ICAM-1. When the activated epithelial cells were co-cultured with PBMCs, the PBMCs produced lager amounts of TNF-alpha and IL-5. However the cytokine production was not inhibited by pretreatment with ICAM-1 antibody. CONCLUSION: HDM allergens induce allergic inflammation by activating nasal epithelial cells, yet the interaction of the epitheila cells and the PBMCs may not be associated with an ICAM-1 medicated mechanism.

Keyword

House dust mite; Nasal epithelial cell; Peripheral blood mononuclear cell; Cytokine; Intercellular adhesion molecule

MeSH Terms

Allergens
Cell Membrane
Colony-Stimulating Factors
Dermatophagoides pteronyssinus
Dust
Epithelial Cells
Immune System
Inflammation
Intercellular Adhesion Molecule-1
Interferon-gamma
Interleukin-5
Interleukins
Nasal Polyps
Pyroglyphidae
RNA, Messenger
Tumor Necrosis Factor-alpha
Allergens
Colony-Stimulating Factors
Dust
Intercellular Adhesion Molecule-1
Interferon-gamma
Interleukin-5
Interleukins
RNA, Messenger
Tumor Necrosis Factor-alpha

Figure

  • Fig. 1 The immunocytochemical findings of the nasal polyp epithelial cells treated with dermatophagoides farina (DF). (A) The nasal epithelial cells were not stimulated with DF. (B, C) The nasal epithelial cells were stimulated with 10 and 50 µg/mL of DF and the number of immune stained cells was increased.

  • Fig. 2 Kinetic study of the interleukin-8 (IL-8) and granulocyte-macrophage colony stimulating factor production in the nasal polyp epithelial cells treated with house dust mites allergens. The cytokine productions were increased is a dose dependent manner.DP: dermatophagoides pteronyssinus; DF: dermatophagoides farina; GM-CSF: granulocyte-macrophage colony stimulating factor.

  • Fig. 3 Production of cytokines from a co-cultrue of peripheral blood mononuclear cells and acativated nasal epithelial cells with house dust mites (HDM) allergens. Dermatophagoides farina (DF) enhanced the TNF-α and interleukin-5 production, and dermatophagoides pteronyssinus (DP) enhanced the tumor necrosis factor (TNF)-α production, but interferon (INF)-γ was not increased. The unit of the HDM extracts' concentration was µg/mL. Negative: the nasal epithelial cells were not stimulated by the HDM extracts. *P<0.05.

  • Fig. 4 The nasal epithelial cells' expression of intercellular adhesion molecule 1 (ICAM-1) mRNA (A) and cell membrane ICAM-1 (B). The ICAM-1 mRNA expression was increased after stimulation with dermatophagoides pteronyssinus. The cell membrane ICAM-1 expression was increasd after stimulation with dermatophagoides pteronyssinus (DP) and dermatophagoides farina (DF). The unit of the house dust mites extracts' concentration was µg/mL. Negative: the nasal epithelial cells were not stimulated by the house dust mites extracts. *P<0.05.


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