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Departments of Clinical Immunology [L. de L., G. M., T. H. T.], Pulmonary Diseases [P. E. P.], Human Genetics [C. H. C. M. B., A. Y. v. d. V.], and Pathology [J. D. E., S. P.], University of Groningen, Groningen; Department of Pathology, University of Nijmegen, Nijmegen [F. R.]; and the Netherlands Cancer Institute, Amsterdam [M. B.], The Netherlands
Three new, well growing cell lines (GLC-1, GLC-2, and GLC-3) have been established from small cell lung carcinoma (SCLC) and characterized. A subclone (GLC-1-M13) markedly different from its parent line GLC-1 was also isolated and characterized.
Cytogenetic analysis of the cell lines revealed deletions in the short arm of chromosome 3 as a most consistent chromosomal aberration. The deleted region was not identical in all metaphases, 3p(21–23) being the shortest region of overlap. Despite their SCLC origin GLC-1, GLC-2, and GLC-3 do not show pronounced SCLC differentiation features. Neurosecretory granula were very rare (GLC-1) or completely absent (GLC-2 and GLC-3), whereas the SCLC-related enzyme and hormone markers L-3,4-dihydroxyphenylalanine decarboxylase, neuron-specific enolase, creatine kinase BB, and bombesin-like immunoreactivity were variably expressed. Although the subclone GLC-1-M13 was derived from the poorly differentiated GLC-1, it behaved according to the above criteria as a differentiated "classic" SCLC cell line. When assessed with specific monoclonal antibodies the different cell lines appeared to express different subsets of intermediate filament proteins, indicative for different stages and directions of differentiation: "undifferentiated" (GLC-1 and GLC-2); "neural tissue related" (GLC-2); "simple epithelium" related (GLC-1-M13); and a combination of simple and squamous epithelium related (GLC-3).
We conclude that GLC-1, GLC-2, and GLC-3 represent dedifferentiated forms of SCLC, related to the recently described "variant" type of SCLC, whereas the clonal derivate GLC-1-M13 behaves like a differentiated "classic" SCLC cell line.
1 To whom requests for reprints should be addressed, at Department of Clinical Immunology, University Hospital, Oostersingel 59, 9713 EZ Groningen, The Netherlands.
Received 12/11/84. Revised 7/19/85. Accepted 7/23/85.
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