Functional expression of high-affinity receptor for immunoglobulin E on mast cells precedes that of tryptase during differentiation from human bone marrow-derived CD34 progenitors cultured in the presence of stem cell factor and interleukin-6.
BACKGROUND
CD34(+) progenitor cells develop into tryptase(+), CD117(+) mast cells when cultured in the presence of recombinant human stem cell factor (rhSCF). However, spontaneous IgE receptor (FcepsilonRI) expression during human mast cell development is not well examined.


OBJECTIVE
Here, the expression and function of FcepsilonRI in and on human bone marrow-derived mast cells (HBMMCs) during development were investigated.


RESULTS
At 4 weeks of culture, predominant cells expressed high-affinity IgE receptor alpha chain (FcepsilonRIalpha) on the cell surface determined by flow cytometry, but CD117 was less expressed. Immunocytochemistry with antitryptase mAb and anti-FcepsilonRIalpha mAb revealed intracellular and surface expression of FcepsilonRIalpha at 2 weeks of culture, but tryptase was less expressed. FcepsilonRIalpha mRNA transcript preceded that of tryptase mRNA at 2 weeks of culture determined by real-time RT-PCR, and FcepsilonRIalpha, FcepsilonRIbeta, FcepsilonRIgamma, and tryptase mRNA increased along with differentiation. FcepsilonRIalpha cross-link on HBMMC and 4-week-old mast cells/mast cell precursors induced the release of IL-5 and granulocyte macrophage-colony stimulating factor, which was enhanced by rhSCF.


CONCLUSIONS
These data indicated that HBMMC constitutively and spontaneously expressed functional FcepsilonRI subunits at the early stage of differentiation, probably because of the differences in the ability and functional property of progenitors.
Shimizu
Y
Y
Department of Medicine and Biological Science, Gunma University Graduate School of Medicine, Maebashi, Japan. yshimizu@med.gunma-u.ac.jp
Suga
T
T
Maeno
T
T
Aoki
F
F
Tsukagoshi
H
H
Kawata
T
T
Sakai
K
K
Narita
T
T
Takahashi
T
T
Ishikawa
S
S
Morishita
Y
Y
Nakajima
T
T
Hara
F
F
Miura
T
T
Kurabayashi
M
M
D018952:Antigens, CD34 / Q000276:immunology; D001854:Bone Marrow Cells / Q000166:cytology / Q000276:immunology; D002454:Cell Differentiation; D002478:Cells, Cultured; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D005434:Flow Cytometry; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000276:immunology; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods; D015847:Interleukin-4 / Q000276:immunology; D015848:Interleukin-5 / Q000276:immunology; D015850:Interleukin-6 / Q000494:pharmacology*; D008407:Mast Cells / Q000276:immunology*; D019009:Proto-Oncogene Proteins c-kit / Q000276:immunology; D017455:Receptors, IgE / Q000378:metabolism*; D011994:Recombinant Proteins / Q000494:pharmacology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012697:Serine Endopeptidases / Q000378:metabolism*; D019089:Stem Cell Factor / Q000494:pharmacology*; D013234:Stem Cells / Q000166:cytology* / Q000276:immunology; D053802:Tryptases
D018952:Antigens, CD34; D015848:Interleukin-5; D015850:Interleukin-6; D017455:Receptors, IgE; D011994:Recombinant Proteins; D019089:Stem Cell Factor; D015847:Interleukin-4; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D019009:Proto-Oncogene Proteins c-kit; D012697:Serine Endopeptidases; D053802:Tryptases