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Specific Cytogenetic Abnormalities in Two New Human Colorectal Adenomaderived Epithelial Cell Lines¹

Department of Pathology, University of Bristol, The Medical School, University Walk, Bristol BS8 1TD [C. P., S. F., S. C. P.], and Department of Medicine, Bristol Royal Infirmary, Bristol BS2 8HW [R. A. M.], England

Two new epithelial cell lines from sporadic human colorectal adenomas designated S/AN and S/RG are reported. S/AN was from a villous adenoma and S/RG from a tubular adenoma. Both cell lines have extended growth capacities in vitro reaching passages 18 and 15, respectively, so far and show no signs of senescence. S/AN and S/RG have retained in vitro the ability to form mucin-producing goblet-like cells.

Every cell of S/AN has a delection on the short arm of chromosome 1 and one normal copy of chromosome 1. S/AN is also monosomic for chromosome 18. The majority of cells of S/RG only have one normal copy of chromosomes 6, 7, 14, 17, 18, and 22. S/RG also has several marker chromosomes. Although aneuploid S/AN and S/RG are nontumorigenic in athymic nude mice, these cytogenetic abnormalities are insufficient for the fully tumorigenic phenotype. The common abnormality for S/AN and S/RG is monosomy for chromosome 18, indicating that this is a central and important step in colorectal carcinogenesis. Our cytogenetic analysis of the adenoma cell lines suggests at least two possible routes by which premalignant colonic cells can develop and progress to malignancy.

S/RG, unlike most other adenoma cell lines, is clonogenic. Aneuploidy, clonogenicity, and extended in vitro growth capacity may therefore be useful in vitro markers for adenoma cell lines with a relatively high malignant potential.

¹ This research was supported by the Cancer Research Campaign of Great Britain.

² To whom requests for reprints should be addressed.

Received 9/23/88. Revised 11/28/88. Accepted 12/ 6/88.

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