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- W2079732181 abstract "The mouse micronucleus assay has long been used as an indicator of in vivo genotoxicity. Recently, it was shown that no single protocol is adequate to detect all clastogens. As a first step in developing a potentially more sensitive assay, micronucleus induction by cyclophosphamide (CP) was assessed in an in vivo/in vitro system using rat bone marrow and spleen cells. In each of two independent experiments, two rats/dose were treated i.p. with 0, 20, or 40 mg CP/kg and killed 6 h later. Cultures were then established in the presence of growth stimulants (interleukin-3 and granulocyte-macrophage colony stimulating factor for bone marrow; lipopolysaccharide and concanavalin A for spleen) and cytochalasin B, a cytokinesis inhibitor. Bone marrow cells were harvested and slides prepared 24 h after initiation, while spleen cells were harvested at 48 h. One thousand cells/tissue/group were scored for cell cycle kinetics and 1000 binucleate (BN) cells were scored for micronuclei. In addition, spleen cells were concurrently assayed for chromosome aberrations. A dose-related cell cycle delay was observed in both tissues in both experiments. Bone marrow showed a 6% average background frequency of micronucleated BN cells, while the low dose induced an average of 20%, and the high dose 31%. For spleen, the average control frequency of micronucleated BN cells was 3%, the low dose induced a 40% average frequency, and the high dose 65%. Also in splenocytes, a dose-dependent increase in chromosome aberrations was observed, with an almost 40-fold increase observed over the control value at the high dose. Thus, the in vivo/in vitro approach described here shows great potential in detecting drug induced genotoxicity. Also, spleen appears more sensitive than bone marrow to CP." @default.
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- W2079732181 date "1995-10-01" @default.
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- W2079732181 title "An in vivo/in vitro method for assessing micronucleus and chromosome aberration induction in rat bone marrow and spleen 1. Studies with cyclophosphamide" @default.
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- W2079732181 doi "https://doi.org/10.1016/0165-1161(95)90055-1" @default.
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