Low burst-promoting activity (BPA) production by cord mononuclear cells is due to functional immaturity of monocytes.
Cord blood mononuclear cells produced lower burst-promoting activity (BPA) than adult peripheral blood mononuclear cells when stimulated with phytohemagglutinin (PHA). In order to examine the cellular basis of the low production of BPA by PHA-stimulated cord blood mononuclear cells in the context of the functional immaturity of T cells or monocytes, we studied BPA production by T cells or monocytes from cord blood and adult peripheral blood. Cord T cells produced as much BPA as adult T cells. Monocytes themselves did not produce significant BPA at the concentration used in this experiment (1 x 10(5)/ml). BPA production by adult T cells was significantly enhanced by the presence of autologous monocytes. BPA production by cord T cells was also enhanced by the presence of adult monocytes but not by that of cord monocytes. Cord monocytes did not enhance BPA production by adult T cells either. These results indicate that cord monocytes are primarily responsible for the low BPA production by PHA-stimulated cord mononuclear cells.
Iwai
Y
Y
Department of Pediatrics, Kyoto University, Japan.
Mayumi
M
M
Kim
K M
KM
Tanaka
M
M
Mikawa
H
H
D004920:Erythropoiesis; D005312:Fetal Blood / Q000166:cytology*; D006801:Humans; D007231:Infant, Newborn; D007377:Interleukin-3 / Q000096:biosynthesis*; D009000:Monocytes / Q000378:metabolism* / Q000502:physiology; D013601:T-Lymphocytes / Q000378:metabolism* / Q000502:physiology
D007377:Interleukin-3