title: [The autocrine regulation of the proliferation of cell line A-549 under conditions facilitating the acidification of the culture medium].
abstract: The influence of serum-free media, previously conditioned by A-549 line cells of the human lung adenocarcinoma (c-medium), on the intensity of 3H-thymidine incorporation into DNA of the same cells was studied. It was found that, depending on the duration of conditioning (2, 4 and 6 days), the c-media were obtained with corresponding values of pH--7.2, 6.9 and 6.3, in the latter case the contact inhibition of cell growth being seen. On culturing the A-549 line cells in the c-medium at pH 7.2 and 6.9, the intensity of DNA biosynthesis was shown to be 2.4 and 1.8 times higher, respectively, compared to that under condition of the fresh serum-free medium. The cell culturing in the c-medium at pH 6.3 (here and in the case of pH 6.9 c-medium the media pH were made up to 7.2 before utilization) leads to the inhibition of DNA biosynthesis intensity in the cells. It was also detected that a temporary acidification of the pH 7.2 c-medium to pH 4.0 or 2.0, using, respectively CO2 bubbling or HCl titration, caused the growth inhibiting manifestation in this medium. The results obtained testify that the carcinoma cells of A-549 line are able to secrete into the cultured medium both stimulators and inhibitors of DNA biosynthesis, with a transforming growth factor beta being of primary importance among the latter.
authors.forename: R S
authors.initials: RS
authors.lastname: Stoĭka
authors.forename: S I
authors.initials: SI
authors.lastname: Sushel'nitskiĭ
authors.forename: S I
authors.initials: SI
authors.lastname: Garas'ko
authors.forename: G I
authors.initials: GI
authors.lastname: Shafranskaia
authors.forename: S I
authors.initials: SI
authors.lastname: Kusen'
mesh_terms: D000230:Adenocarcinoma / Q000378:metabolism* / Q000473:pathology; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D017077:Culture Media, Conditioned; D016895:Culture Media, Serum-Free / Q000378:metabolism*; D004273:DNA, Neoplasm / Q000096:biosynthesis / Q000187:drug effects; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008175:Lung Neoplasms / Q000378:metabolism* / Q000473:pathology; D008233:Lymphotoxin-alpha / Q000378:metabolism / Q000494:pharmacology; D013936:Thymidine / Q000378:metabolism; D013997:Time Factors; D014316:Tritium; D014407:Tumor Cells, Cultured / Q000187:drug effects / Q000378:metabolism
chemical_list: D017077:Culture Media, Conditioned; D016895:Culture Media, Serum-Free; D004273:DNA, Neoplasm; D008233:Lymphotoxin-alpha; D014316:Tritium; D013936:Thymidine
vernacular_title: Autokrinnaia reguliatsiia proliferatsii kletok linii A-549 v usloviiakh, sposobstvuiushchikh zakisleniiu kul'tural'noĭ sredy.