title: Altered toxicity of 5-fluorouracil following treatment with Corynebacterium parvum.
abstract: Recent studies have demonstrated that systemic Corynebacterium parvum increases serum granulocyte-macrophage colony-stimulating factor and stimulates the proliferation of granulocyte-macrophage progenitor cells. It was hypothesized that more rapid cycling of granulocyte-macrophage progenitor cells would render the cells more sensitive to a cell cycle-specific chemotherapeutic agent. The colony-forming ability of bone marrow granulocyte-macrophage progenitor cells was assayed in vitro with soft agar cultures. C. parvum given before 5-fluorouracil in C57BL/6 mice increased the granulocyte-macrophage progenitor cell toxicity, the lymphopenic effect, and the lethality of 5-fluorouracil. When C. parvum was given after 5-fluorouracil, there was more rapid rebound of granulocyte counts to normal or supranormal levels.
mesh_terms: D000818:Animals; D003115:Colony-Stimulating Factors / Q000097:blood; D005472:Fluorouracil / Q000008:administration & dosage / Q000009:adverse effects*; D006098:Granulocytes / Q000187:drug effects*; D006412:Hematopoietic Stem Cells / Q000187:drug effects*; D007962:Leukocytes / Q000187:drug effects*; D007970:Leukopenia / Q000139:chemically induced; D008264:Macrophages / Q000187:drug effects*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D011425:Propionibacterium acnes / Q000276:immunology*; D013997:Time Factors
chemical_list: D003115:Colony-Stimulating Factors; D005472:Fluorouracil