Radiation sensitivity of human B-lineage lymphoid precursor cells.
We studied the radiation sensitivity of eight immunophenotypically distinct B-lineage lymphoid precursor cell (LPC) lines of acute lymphoblastic leukemia (ALL) or fetal liver origin corresponding to discrete developmental stages of human B-cell ontogeny. The radiation sensitivity of B-lineage LPC showed a temporal association with the distinct stages of development. FL112 and FL114 fetal liver pro-B cells (Stage 0 B-lineage LPC) with germline immunoglobulin heavy chain (IgH) genes but rearranged T-cell receptor gamma (T gamma) genes (DO of FL112 = 80.3 cGy, DO of FL114 = 50.2 cGy), REH ALL pre-pre-B cells (Stage I B-lineage LPC) with rearranged IgH and T gamma genes (DO = 66.1 cGy), and NALM-6 ALL pre-pre-B/pre-B cells (Stage II B-lineage LPC) (DO = 50.5 cGy) corresponding to the earliest three stages of human B-lymphocyte development were the most radiation sensitive B-lineage LPC populations. By comparison, KM-3 ALL pre-B (Stage III B-lineage LPC) (DO = 194.7 cGy), HPB-NULL ALL pre-B (Stage IV B-lineage LPC) (DO = 134.6 cGy), and sIgM+ RAJI/NAMALWA early B (Stage Va/b B-lineage LPC) cell lines (DO of RAJI = 144.0 cGy, DO of NAMALWA = 165.5 cGy) corresponding to the later stages of human B-lymphocyte development were much more radiation resistant. These results indicate that the radiation sensitivity of B-lineage LPC decreases during maturation within the B-lineage lymphoid precursor pathway. By comparison, the S-phase index (% of S-phase cells as determined by DNA flow cytometry) or proliferation index (% S + G2M), cellular protein content, intracellular glutathione (GSH) level, glutathione-S-transferase (GST) activity, intracellular pH, or free cytoplasmic calcium concentration did not correlate with the radiation sensitivity of the B-lineage LPC.
Department of Therapeutic Radiology-Radiation Oncology, University of Minnesota, Minneapolis 55455.
F M
FM
Uckun
J B
JB
Mitchell
V
V
Obuz
C H
CH
Park
K
K
Waddick
N
N
Friedman
L
L
Oubaha
W S
WS
Min
C W
CW
Song
D001402:B-Lymphocytes / Q000737:chemistry / Q000473:pathology / Q000528:radiation effects; D002470:Cell Survival; D005838:Genotype; D006801:Humans; D016130:Immunophenotyping; D009367:Neoplasm Staging; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000235:genetics / Q000473:pathology / Q000532:radiotherapy*; D011836:Radiation Tolerance / Q000235:genetics / Q000502:physiology; D014407:Tumor Cells, Cultured / Q000528:radiation effects