Differential expression of CD45RO (UCHL1) and its functional relevance in two subpopulations of circulating TCR-gamma/delta+ lymphocytes.
We examined the developmental profile of TCR-gamma/delta+ cells with respect to CD45RO expression. Although total TCR-gamma/delta+ cells were negligible in the neonatal blood and increased with advancing age, most blood TCR-gamma/delta+ cells markedly expressed CD45RO without a distinction of age, probably reflecting a different CD45RO expression of two subsets defined by BB3 and delta TCS1 mAbs. The vast majority of BB3+ cells expressed CD45RO, whereas expression of CD45RO was virtually absent in the delta TCS1+ population. Functional studies revealed that, while both TCR-gamma/delta+ cell subsets showed CD3-mediated activation, only BB3+ (or Ti gamma A+) cells, but not delta TCS1+ cells, appeared to proliferate in response to PPD in PPD-reactive individuals. The results suggested that the CD45RO+ (BB3+ or Ti gamma A+) subset among blood TCR-gamma/delta+ cells may be mainly involved in the memory or primed component of the immune system responding to some foreign antigens.
Miyawaki
T
T
Department of Pediatrics, School of Medicine, Kanazawa University, Kanazawa, Ishikawa, Japan.
Kasahara
Y
Y
Taga
K
K
Yachie
A
A
Taniguchi
N
N
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D015703:Antigens, CD / Q000032:analysis*; D000943:Antigens, Differentiation / Q000032:analysis*; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis; D017252:CD3 Complex; D002648:Child; D002675:Child, Preschool; D005312:Fetal Blood / Q000276:immunology; D005455:Fluorescent Antibody Technique; D006649:Histocompatibility Antigens / Q000032:analysis*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D017493:Leukocyte Common Antigens; D011948:Receptors, Antigen, T-Cell / Q000032:analysis*; D013601:T-Lymphocytes / Q000276:immunology*
D015703:Antigens, CD; D000943:Antigens, Differentiation; D000945:Antigens, Differentiation, T-Lymphocyte; D017252:CD3 Complex; D006649:Histocompatibility Antigens; D011948:Receptors, Antigen, T-Cell; D017493:Leukocyte Common Antigens