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Identification and characterization of different subpopulations in a human lung adenocarcinoma cell line (A549)

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Pathology & Oncology Research

Abstract

The morphology, cell growth, antigenic expression and tumorigenicity of cell subpopulations from the A549 lung adenocarcinoma isolated by Percoll gradient separation have been analysed. Four subpopulations were obtained (subpopulations A, B, C and D). Immunocytochemical analysis of several antigens was performed with monoclonal antibodies (MAbs): MUC1 mucin (C595, HMFG1 and HMFG2), MUC5B (PANH2); gp230 (PANH4); carbohydrate antigens including sialyl Lewis x (KM93), Tn antigen (83D4), Lewis y (C14); 5, 6, 8,17 and 19 cytokeratins and p53. The cell population D tended to form cell aggregates that piled up on the monolayer similar to overgrowth cultures of the A549 parental cell line, whereas A, B and C cell subpopulations formed well spread monolayers. Both parental A549 and subpopulation D secreted abundant mucus. The topographic distribution and secretion production were correlated with tumorigenic assays since only subpopulation D grew in nude mice exhibiting reduced latency period; these characteristics correlated with the fast growth of the subpopulation D in vitro. Immunocytochemical analysis demonstrated that subpopulation D showed greater expression of MUC1 mucin and carbohydrate antigens such as Tn antigen, sialyl Lewis x and Lewis y and less expression of cytokeratins, p53, MUC5B and gp230; conversely, subpopulations A, B and C showed the opposite antigenic profile. Our results illustrate heterogeneity in the A549 cell line; subpopulations A, B and C retained characteristics of more differentiated adenocarcinoma while subpopulation D displayed features of a less differentiated tumor line.

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Authors and Affiliations

  1. Centro de Investigaciones Inmunológicas Básicas y Aplicadas (CINIBA), Calle 60 y 120 Universidad Nacional La Plata, Argentina

    Maria Virginia Croce & Andrea Gladys Colussi

  2. Cancer Research Laboratories, School of Pharmaceutical Sciences, University of Nottingham, UK

    Mike R Price & Amada Segal-Eiras

Authors
  1. Maria Virginia Croce
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  2. Andrea Gladys Colussi
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  3. Mike R Price
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  4. Amada Segal-Eiras
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Correspondence to Amada Segal-Eiras.

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Croce, M.V., Colussi, A.G., Price, M.R. et al. Identification and characterization of different subpopulations in a human lung adenocarcinoma cell line (A549). Pathol. Oncol. Res. 5, 197–204 (1999). https://doi.org/10.1053/paor.1999.0212

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  • DOI: https://doi.org/10.1053/paor.1999.0212

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