CYTOGENETIC ABNORMALITIES AND THE PROGRESSION TO INVASION IN A375P HUMAN MELANOMA CELLS IN VITRO

• Main Author: Greeff, Christopher Whitney, 1961-
• Language: en_US
• Published: The University of Arizona. 1987
• Subjects: Cytogenetics.; Melanoma.; Melanocytes.; Cancer invasiveness.
• Online Access: http://hdl.handle.net/10150/276462

A study was undertaken to determine whether cytogenetic abnormalities can be identified in an invasive melanoma cell population that has been selected in vitro out of a larger cell population of low invasive potential. The selecting agent was a denuded human amniotic membrane situated within Mega-Membrane Invasion Culture System chambers. Invasive cells were collected, grown, and harvested for cytogenetic analysis. Metaphases of these cells were examined for chromosomal abnormalities and for evidence of gene amplification in the form of double minute chromosomes. Invasive cell lines evinced changes in their degree of aneuploidy which were not seen in parental control lines of the same passage number. Significant karyotypic abnormalities identified in invasive cell lines were an increased dosage of chromosome 7 and multiple 1q translocation marker chromosomes. Double minute chromosomes were found in up to 18% of invasive cell metaphases examined and in 3% of parental controls. The incidence of double minutes was found to decrease as a function of passage number.