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Induction of apoptosis in the centre of multicellular tumour spheroids of colorectal adenocarcinomas—involvement of CD95 pathway and differentiation

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Abstract

Multicellular tumour spheroids (MCTS) are three-dimensional cell culture systems which are widely used in cancer research. They are characterized by an outer zone of proliferating cells, an inner region of differentiating quiescent cells and an area of so-called necrotic cell death in their centre. The exact cause of this cell death, a controversy for many years, was the aim of the present study. Our data show that cell death in the centre of MCTS of three colorectal adenocarcinoma cell lines (HRT-18, HT-29 and CX-2) was induced by apoptosis. Apoptotic cells were initially distributed at random but accumulated very quickly in the quiescent and central area at day 4–5, suggesting a time- rather than size-dependent synchronization of apoptosis parallel to the formation of the proliferation gradient in MCTS. To study mechanisms inducing apoptosis, the Fas-pathway was investigated. A cell--cell contact-dependent expression of CD95 was found in all MCTS. FasL was not detected in monolayer cultures, but was expressed in spheroids of HRT-18 and CX-2. We found that TNFα and TGFβ1 activated the CD95 pathway in all three cell lines. Since both TNF-α and TGF-β are known to be inducible by hypoxia in a variety of cell types, we suggest that these hypoxia-induced factors sensitize the CD95 pathway in the quiescent area of MCTS. Furthermore, a loss of the heat shock proteins 27, 32, 60, 73 and 90 was observed in the quiescent area of spheroids. This suggests that tumour cell differentiation in the inner region of MCTS may be an additional factor inducing apoptosis.

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Authors and Affiliations

  1. Institute of Pathology, Charité Hospital Berlin, D-10117, Berlin, Germany

    S. Hauptmann, A. Leclere, C. Denkert, S. Pest & M. Dietel

  2. Institute of Pathology, RWTH Aachen, D-52057, Aachen, Germany

    P. Gebauer-Hartung & B. Klosterhalfen

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  1. S. Hauptmann
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  2. P. Gebauer-Hartung
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  3. A. Leclere
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  7. M. Dietel
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Hauptmann, S., Gebauer-Hartung, P., Leclere, A. et al. Induction of apoptosis in the centre of multicellular tumour spheroids of colorectal adenocarcinomas—involvement of CD95 pathway and differentiation. Apoptosis 3, 267–280 (1998). https://doi.org/10.1023/A:1009613325845

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