Selective down-regulation of high-affinity IgE receptor (Fc epsilon RI) alpha-chain messenger RNA among transcriptome in cord blood-derived versus adult peripheral blood-derived cultured human mast cells
M. Iida et al., Selective down-regulation of high-affinity IgE receptor (Fc epsilon RI) alpha-chain messenger RNA among transcriptome in cord blood-derived versus adult peripheral blood-derived cultured human mast cells, BLOOD, 97(4), 2001, pp. 1016-1022
Substantial numbers of human mast cells (MCs) were generated from umbilical
cord blood (CB) and from adult peripheral blood (PB). A single CB progenit
or produced 15 436 MCs, whereas a single PB progenitor produced 807 MCs on
average. However, PB-derived MCs were far more active than CB-derived MCs i
n terms of high-affinity IgE receptor (Fc epsilon RI)-mediated reactions. O
ne million sensitized PB-derived MCs released 3.6 mug histamine, 215 pg IL-
5, and 14 ng granulocyte macrophage-colony-stimulating factor (GMCSF), wher
eas 10(6) sensitized CB-derived MCs released only 0.8 mug histamine, 31 pg
IL-5, and 0.58 ng GM-CSF on anti-IgE challenge. However, ionophore A23 187
released similar levels of histamine from the 2 MC types. PR-derived MCs hi
ghly expressed surface FceRI alpha chain, and CB-derived MCs almost lacked
it in the absence of IgE, PR-derived MCs expressed approximately 5 times hi
gher levels of messenger RNA (mRNA) for Fc epsilon RI a chain than CB-deriv
ed MCs, but mRNAs for beta and gamma chains of the receptors were equally e
xpressed. Among the approximately 5600 kinds of full-length human genes exa
mined by using the high-density oligonucleotide probe-array system, Fc epsi
lon RI alpha was ranked the fifth most increased transcript in PB-derived M
Cs, The 4 other increased transcripts were unrelated to MC function. These
results suggest that IgE-mediated reactions may be restricted during early
infancy through the selective inhibition of Fc epsilon RI alpha transcripti
on, which is probably committed at progenitor stages and is, at least in pa
rt, cytokine-insensitive. (C) 2001 by The American Society of Hematology.