title: Macrophage regulation of myelopoiesis is altered by exposure to the benzene metabolite hydroquinone.
abstract: Hydroquinone, a myelotoxic metabolite of benzene, decreases the ability of murine bone marrow stromal cells to support myelopoiesis in vitro. Bone marrow stroma consists of macrophages and fibroblastoid stromal cells that participate coordinately in regulating myelopoiesis. The goal of this study was to determine if macrophage or fibroblastoid cell function is more sensitive to the myelotoxic actions of hydroquinone. To address this question, we developed purified populations of macrophages and fibroblastoid stromal cells and treated each population with hydroquinone. These cells were reconstituted together with nontreated cells of the opposite type and assayed for their ability to support the formation of granulocyte and macrophage colonies in an agar overlay. Reconstituted cultures containing hydroquinone-treated macrophages supported fewer colonies than did corresponding cultures containing untreated macrophages. Reconstituted cultures containing hydroquinone-treated fibroblastoid stromal cells were not affected. Moreover, hydroquinone reduced detectable interleukin-1 activity in purified macrophage cultures stimulated with lipopolysaccharide. These results indicate that hydroquinone selectively interferes with macrophage function possibly, in part, via alteration of macrophage interleukin-1 secretion.
authors.affiliation: Department of Pharmacology and Toxicology, West Virginia University Health Sciences Center, Morgantown 26506.
authors.forename: D J
authors.initials: DJ
authors.lastname: Thomas
authors.forename: M J
authors.initials: MJ
authors.lastname: Reasor
authors.forename: D
authors.initials: D
authors.lastname: Wierda
mesh_terms: D000818:Animals; D001554:Benzene / Q000378:metabolism / Q000633:toxicity; D001853:Bone Marrow / Q000187:drug effects*; D001854:Bone Marrow Cells; D002460:Cell Line; D003115:Colony-Stimulating Factors / Q000096:biosynthesis; D006410:Hematopoiesis / Q000187:drug effects*; D006412:Hematopoietic Stem Cells / Q000187:drug effects; D006873:Hydroquinones / Q000633:toxicity*; D007375:Interleukin-1 / Q000032:analysis; D008264:Macrophages / Q000187:drug effects* / Q000502:physiology; D008297:Male; D051379:Mice; D008809:Mice, Inbred C3H
chemical_list: D003115:Colony-Stimulating Factors; D006873:Hydroquinones; D007375:Interleukin-1; D001554:Benzene; C031927:hydroquinone