Conditioned media from macrophages of M1, but not M2 phenotype, inhibit the proliferation of the colon cancer cell lines HT-29 and CACO-2

Engström,Alexander; Erlandsson,Ann; Delbro,Dick; Wijkander,Jonny

doi:10.3892/ijo.2013.2203

Conditioned media from macrophages of M1, but not M2 phenotype, inhibit the proliferation of the colon cancer cell lines HT-29 and CACO-2

Authors:
- Alexander Engström
- Ann Erlandsson
- Dick Delbro
- Jonny Wijkander
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Affiliations: Department of Health Sciences, Karlstad University, Karlstad, Sweden, School of Health and Medical Sciences, Örebro University, Örebro, Sweden
Published online on: December 2, 2013 https://doi.org/10.3892/ijo.2013.2203
Pages: 385-392
Copyright: © Engström et al. This is an open access article distributed under the terms of Creative Commons Attribution License [CC BY_NC 3.0].

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Abstract

Solid tumors are infiltrated by stroma cells including macrophages and these cells can affect tumor growth, metastasis and angiogenesis. We have investigated the effects of conditioned media (CM) from different macrophages on the proliferation of the colon cancer cell lines HT-29 and CACO-2. CM from THP-1 macrophages and monocyte‑derived human macrophages of the M1 phenotype, but not the M2 phenotype, inhibited proliferation of the tumor cells in a dose‑dependent manner. Lipopolysaccaharide and interferon γ was used for differentiation of macrophages towards the M1 phenotype and CM were generated both during differentiation (M1DIFF) and after differentiation (M1). M1 and M1DIFF CM as well as THP-1 macrophage CM resulted in cell cycle arrest in HT-29 cells with a decrease of cells in S phase and an increase in G2/M phase. Treatment of HT-29 cells with M1DIFF, but not M1 or THP-1 macrophage CM, resulted in apoptosis of about 20% of the tumor cells and this was accompanied by lack of recovery of cell growth after removal of CM and subsequent culture in fresh media. A protein array was used to identify cytokines released from M1 and M2 macrophages. Among the cytokines released by M1 macrophages, tumor necrosis factor α and CXCL9 were tested by direct addition to HT-29 cells, but neither affected proliferation. Our results indicate that M1 macrophages inhibit colon cancer cell growth and have the potential of contributing to reducing tumor growth in vivo.

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