title: Bone marrow lymphoid and myeloid progenitor cells are suppressed in 7,12-dimethylbenz(a)anthracene (DMBA) treated mice.
abstract: In this study we used colony forming unit (CFU) assays to demonstrate rapid suppression (within 6h) of lymphoid (CFU-preB) and myeloid (CFU-GM) progenitor cells in DMBA-treated mice. The duration of these changes were consistent with the blood levels of DMBA and its metabolites that were achieved by either IP or oral DMBA administration. CFU-GM and CFU-preB activities returned to control levels by 2 and 7 days after oral DMBA exposure, respectively, but remained suppressed through 7 days after IP DMBA administration. The continued presence of low levels of DMBA in the bloodstream following IP administration was associated with sustained suppression of CFU-preB, total bone marrow lymphoid cells and peripheral blood lymphocytes. The changes noted above were not observed in Cyp1b1 null mice, demonstrating the need for local DMBA metabolism in the bone marrow by Cyp1b1 to impair bone marrow CFU-preB and CFU-GM. Furthermore, these data provide evidence that myeloid-lineage cells are restored more quickly than lymphoid-lineage cells after DMBA exposure.
authors.affiliation: Department of Pathobiological Sciences, University of Wisconsin, Madison, WI 53706, USA.
authors.forename: A U
authors.initials: AU
authors.lastname: N'jai
authors.forename: M
authors.initials: M
authors.lastname: Larsen
authors.forename: L
authors.initials: L
authors.lastname: Shi
authors.forename: C R
authors.initials: CR
authors.lastname: Jefcoate
authors.forename: C J
authors.initials: CJ
authors.lastname: Czuprynski
mesh_terms: D015127:9,10-Dimethyl-1,2-benzanthracene / Q000008:administration & dosage / Q000633:toxicity*; D000284:Administration, Oral; D000818:Animals; D001189:Aryl Hydrocarbon Hydroxylases / Q000378:metabolism; D001772:Blood Cell Count; D001854:Bone Marrow Cells / Q000187:drug effects*; D002273:Carcinogens / Q000633:toxicity*; D003114:Colony-Forming Units Assay; D065633:Cytochrome P-450 CYP1B1; D005260:Female; D005434:Flow Cytometry; D006410:Hematopoiesis / Q000187:drug effects*; D007274:Injections, Intraperitoneal; D054503:Lymphoid Progenitor Cells / Q000166:cytology / Q000187:drug effects*; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D023461:Myeloid Progenitor Cells / Q000166:cytology / Q000187:drug effects*; D011897:Random Allocation
chemical_list: D002273:Carcinogens; D015127:9,10-Dimethyl-1,2-benzanthracene; D001189:Aryl Hydrocarbon Hydroxylases; C585498:Cyp1b1 protein, mouse; D065633:Cytochrome P-450 CYP1B1