An increase in circulating mast cell colony-forming cells in asthma.
We compared a potential to generate mast cells among various sources of CD34(+) peripheral blood (PB) cells in the presence of stem cell factor (SCF) with or without thrombopoietin (TPO), using a serum-deprived liquid culture system. From the time course of relative numbers of tryptase-positive and chymase-positive cells in the cultured cells grown by CD34(+) PB cells of nonasthmatic healthy individuals treated with G-CSF, TPO appears to potentiate the SCF-dependent growth of mast cells without influencing the differentiation into mast cell lineage. CD34(+) PB cells from asthmatic patients in a stable condition generated significantly more mast cells under stimulation with SCF alone or SCF+TPO at 6 wk of culture than did steady-state CD34(+) PB cells of normal controls. Single-cell culture studies showed a substantial difference in the number of SCF-responsive or SCF+TPO-responsive mast cell progenitors in CD34(+) PB cells between the two groups. In the presence of TPO, CD34(+) PB cells from asthmatic children could respond to a suboptimal concentration of SCF to a greater extent, compared with the values obtained by those of normal controls. Six-week cultured mast cells of asthmatic subjects had maturation properties (intracellular histamine content and tryptase/chymase enzymatic activities) similar to those derived from mobilized CD34(+) PB cells of nonasthmatic subjects. An increase in a potential of circulating hemopoietic progenitors to differentiate into mast cell lineage may contribute to the recruitment of mast cells toward sites of asthmatic mucosal inflammation.
Department of Pediatrics, Shinshu University School of Medicine, Matsumoto, Japan.
H H
HH
Mwamtemi
K
K
Koike
T
T
Kinoshita
S
S
Ito
S
S
Ishida
Y
Y
Nakazawa
Y
Y
Kurokawa
K
K
Shinozaki
K
K
Sakashita
K
K
Takeuchi
M
M
Shiohara
T
T
Kamijo
Y
Y
Yasui
A
A
Ishiguro
Y
Y
Kawano
K
K
Kitano
H
H
Miyazaki
T
T
Kato
S
S
Sakuma
A
A
Komiyama
D000293:Adolescent; D018952:Antigens, CD34 / Q000096:biosynthesis / Q000097:blood; D001249:Asthma / Q000097:blood* / Q000276:immunology / Q000473:pathology; D002452:Cell Count; D002454:Cell Differentiation / Q000276:immunology; D002455:Cell Division / Q000276:immunology; D019070:Cell Lineage / Q000276:immunology; D002478:Cells, Cultured; D016922:Cellular Senescence / Q000276:immunology; D002648:Child; D002675:Child, Preschool; D004338:Drug Combinations; D005260:Female; D016179:Granulocyte Colony-Stimulating Factor / Q000494:pharmacology; D006412:Hematopoietic Stem Cells / Q000276:immunology / Q000378:metabolism / Q000473:pathology*; D006801:Humans; D015850:Interleukin-6 / Q000494:pharmacology; D008297:Male; D008407:Mast Cells / Q000276:immunology / Q000378:metabolism / Q000473:pathology*; D019089:Stem Cell Factor / Q000494:pharmacology; D013926:Thrombopoietin / Q000494:pharmacology
D018952:Antigens, CD34; D004338:Drug Combinations; D015850:Interleukin-6; D019089:Stem Cell Factor; D016179:Granulocyte Colony-Stimulating Factor; D013926:Thrombopoietin