Establishment and characterization of high- and low-metastatic clones derived from a methylcholanthrene-induced rat fibrosarcoma.
High- (Cl-33H) and low- (Cl-35L) metastatic clones were established from a methylcholanthrene-induced rat fibrosarcoma (FMQ-100). The modal chromosome numbers of the two clones were different. These clones grew in in vitro culture, showing similar growth rate and saturation density. However, in in vivo experiments, Cl-33H exhibited a higher tumor growth rate, tumorigenicity, spontaneous metastatic potential, and experimental metastatic potential than did Cl-35L. Alveolar macrophages obtained from normal syngeneic rats stimulated growth of these clones in vitro, as assessed by [3H]thymidine uptake. Moreover, this effect was greater on Cl-33H than Cl-35L. The growth-promoting effect of macrophages was also observed under the in vitro condition of lack of direct contact between macrophages and tumor cells. These results suggested the possibility that alveolar macrophage-derived growth-promoting factors play some role in the development of pulmonary metastasis in this tumor system, and the difference of susceptibility to the growth-promoting factors might be one of the causes of the different metastatic potentials of Cl-33H and Cl-35L.
D000818:Animals; D002460:Cell Line; D005354:Fibrosarcoma / Q000473:pathology*; D006133:Growth Substances / Q000502:physiology; D007621:Karyotyping; D008175:Lung Neoplasms / Q000556:secondary; D008264:Macrophages / Q000502:physiology; D008748:Methylcholanthrene; D009362:Neoplasm Metastasis; D011650:Pulmonary Alveoli / Q000276:immunology / Q000473:pathology; D051381:Rats
D006133:Growth Substances; D008748:Methylcholanthrene