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H-ras-transformed NRK-52E renal epithelial cells have altered growth, morphology, and cytoskeletal structure that correlates with renal cell carcinoma in vivo

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Summary

We studied the effect of the ras oncogene on the growth kinetics, morphology, cytoskeletal structure, and tumorigenicity of the widely used NRK-52E rat kidney epithelial cell line and two H-ras oncogene-transformed cell lines, H/1.2-NRK-52E (H/1.2) and H/6.1-NRK-52E (H/6.1). Population doubling times of NRK-52E, H/1.2, and H/6.1 cells were 28, 26, and 24 h, respectively, with the transformed cells reaching higher saturation densities than the parent cells. NRK-52E cells had typical epithelial morphology with growth in colonies. H/1.2 and H/6.1 cell colonies were more closely packed, highly condensed, and had increased plasma membrane ruffling compared to parent cell colonies. NRK-52E cells showed microfilament, microtubule, and intermediate filament networks typical of epithelial cells, while H/1.2 and H/6.1 cells showed altered cytoskeleton architecture, with decreased stress fibers and increased microtubule and intermediate filament staining at the microtubule organizing center. H/1.2 and H/6.1 cells proliferated in an in vitro soft agar transformation assay, indicating anchorage-independence, and rapidly formed tumors in vivo with characteristics of renal cell carcinoma, including mixed populations of sarcomatoid, granular, and clear cells, H/6.1 cells consistently showed more extensive alterations of growth kinetics, morphology, and cytoskeleton than H/1.2 cells, and formed tumors of a more aggressive phenotype. These data suggest that analysis of renal cell characteristics in vitro may have potential in predicting tumor behavior in vivo, and significantly contribute to the utility of these cell lines as in vitro models for examining renal epithelial cell biology and the role of the ras proto-oncogene in signal transduction involving the cytoskeleton.

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Author notes

  1. Ronald L. Merriman

    Present address: Parke-Davis Pharmaceutical Research, 2800 Plymouth Road, 48105, Ann Arbor, Michigan

Authors and Affiliations

  1. Lilly Research Laboratories, Eli Lilly and Company, 46140, Indianapolis, Indiana

    Lee R. Tanzer & Ronald L. Merriman

  2. Department of Pathology, MSTF, Room 7-34, University of Maryland, School of Medicine, 10 South Pine Street, 21201, Baltimore, Maryland

    Carolyn J. M. Best, Patricia C. Phelps, Benjamin F. Trump & Kathryn A. Elliget

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Best, C.J.M., Tanzer, L.R., Phelps, P.C. et al. H-ras-transformed NRK-52E renal epithelial cells have altered growth, morphology, and cytoskeletal structure that correlates with renal cell carcinoma in vivo . In Vitro Cell.Dev.Biol.-Animal 35, 205–214 (1999). https://doi.org/10.1007/s11626-999-0028-2

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