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Growth Adaptation to Methotrexate of HT-29 Human Colon Carcinoma Cells Is Associated with Their Ability to Differentiate into Columnar Absorptive and Mucus-secreting Cells¹

Unité de Recherches sur la Différenciation et la Neuroendocrinologie de Cellules Digestives (INSERM U178), 16 avenue Paul Vaillant Couturier, 94807 Villejuif Cedex, France

The purpose of this work was to investigate whether the phenomenon of metabolic adaptation of HT-29 cells to glucose deprivation and subsequent emergence of differentiated subpopulations (A. Zweibaum et al., J. Cell. Physiol., 122: 21–29, 1985) also applies to anticancer drugs that act at a metabolic level like methotrexate (MTX). Stepwise adaptation of exponentially growing HT-29 cells to increasing concentrations of MTX (10^-7, 10^-6, and 10^-5 mol) results, after a phase of high mortality, in the emergence of subpopulations with stable growth rates and curves close to those of untreated control cells. In contrast to control cells which are heterogenous and contain, after confluency, only a small proportion of differentiated cell types (less than 4%), postconfluent cultures of MTX-adapted cells are totally differentiated. Cells adapted to 10^-7 M MTX form a mixed population of columnar absorptive and mucus cells; at higher concentrations cells are almost exclusively of the mucus-secreting type. All cells, whether mucus-secreting or not, develop an apical brush border which strongly expresses dipeptidylpeptidase IV, carcinoembryonic antigen, and villin. These differentiation features, which resemble those of fetal colon, are associated with decreased rates of glucose consumption and lactic acid production. Both differentiation characteristics and metabolic changes are stably maintained when the cells are subcultured in the absence of the drug. Like the original population, MTX-adapted cells are tumorigenic in nude mice. We propose that cells which are able to differentiate and which are the origin of the small proportion of differentiated cell types found in postconfluent cultures of the original cell line possess an advantage which allows them to be adaptable to "metabolic stress" conditions.

¹ Supported by the Association pour la Recherche sur le Cancer (ARC), the Groupement des Entreprises Françaises de Lutte contre le Cancer (GEFLUC), and the Fondation pour la Recherche Médicale.

² To whom requests for reprints should be addressed.

Received 3/21/90. Accepted 6/29/90.

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