title: Further purification of a CFU-S inhibitor: in vivo effects after cytosine arabinoside treatment.
abstract: This paper describes a large scale extraction procedure which allows the preparation of a stable CFU-S inhibitor from fetal calf bone marrow. The use of BioGel P-2 gels results in an increase of the specific activity of the inhibitor as well as in the yield of the preparation. When injected into mice, the inhibitory fraction (Ve/Vo 1.17-1.8) prevent CFU-S entry into cycle after cytosine arabinoside at a dose of 4 micrograms per mouse. When administered during lethal protocols of Ara-C treatment, it significantly increases the percentage of surviving animals. Thus, this low molecular weight factor (below 2,000 D), devoid of species-specificity, enhances the tolerance of animals to high doses of chemotherapy and might be of interest in cancer treatment.
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells; D002417:Cattle; D003561:Cytarabine / Q000494:pharmacology*; D004247:DNA / Q000096:biosynthesis; D005260:Female; D006412:Hematopoietic Stem Cells / Q000187:drug effects*; D008074:Lipoproteins / Q000302:isolation & purification / Q000494:pharmacology*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008808:Mice, Inbred CBA; D008970:Molecular Weight; D011506:Proteins
chemical_list: D008074:Lipoproteins; D011506:Proteins; D003561:Cytarabine; C016313:colony inhibiting factor; D004247:DNA