Human skin mast cells produce TNF-alpha by substance P.
Using in situ hybridization and the reverse transcriptase polymerase chain reaction (RT-PCR) we show that messenger RNA for IL-4, IL-5 and tumor necrosis factor-alpha (TNF-alpha) is induced by cross-linkage of high-affinity Fc(epsilon) receptors (Fc(epsilon)RI) on human skin mast cells, but that only TNF-alpha mRNA is selectively induced by substance P. Skin mast cells were purified using the Percoll density technique. T cells were removed by serial negative selection using a CD2 monoclonal antibody (mAb) to achieve a final mast cell purity >95%. Purified mast cells were precultured with recombinant human stem cell factor (rhSCF; 10 ng/ml) and myeloma IgE (3 microg/ml) for 16 h before challenge with sheep polyclonal antihuman IgE antibody (anti-IgE; 1 or 10 microg/ml) in the presence of rhSCF (50 ng/ml). Using in situ hybridization, we demonstrated that IgE-dependent stimulation induces the expression of IL-4, IL-5 and TNF-alpha mRNA in skin mast cells. We have investigated the expression of IL-4, IL-5 and TNF-alpha mRNA by substance P, with the result that substance P, 0.003-30 microM, selectively induced TNF-alpha mRNA. However, substance P did not induce IL-4 mRNA and did not enhance IL-5 mRNA. Furthermore, we confirmed the release of TNF-alpha by substance P from skin mast cells using an ELISA technique. These findings demonstrate the capacity of human skin mast cells to transcribe IL-4, IL-5 and TNF-alpha by immunological activation and to transcribe and release TNF-alpha by substance P.
First Department of Internal Medicine, Maebashi, Japan. yokayama@sb.gunma-u.ac.jp
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Okayama
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Ono
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Nakazawa
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Church
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Mori
D001483:Base Sequence; D017931:DNA Primers / Q000235:genetics; D015870:Gene Expression / Q000187:drug effects; D006801:Humans; D007073:Immunoglobulin E / Q000378:metabolism; D017403:In Situ Hybridization; D066298:In Vitro Techniques; D015847:Interleukin-4 / Q000235:genetics; D015848:Interleukin-5 / Q000235:genetics; D008168:Lung / Q000166:cytology / Q000187:drug effects / Q000276:immunology; D008407:Mast Cells / Q000187:drug effects* / Q000276:immunology* / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012867:Skin / Q000166:cytology / Q000187:drug effects* / Q000276:immunology*; D013373:Substance P / Q000494:pharmacology*; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis* / Q000235:genetics* / Q000378:metabolism
D017931:DNA Primers; D015848:Interleukin-5; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha; D015847:Interleukin-4; D013373:Substance P; D007073:Immunoglobulin E