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Neutral endopeptidase depletion decreases colon cancer cell proliferation and TGF-β1 synthesis in indirect co-cultures with normal colon fibroblasts

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Abstract

Purpose

Although recent studies have suggested that neutral endopeptidase (NEP) is implicated in the regulation of colon cancer (CC) cell growth and metastasis, the influence of the tumor microenvironment on this role of NEP has not been investigated so far. Normal colon fibroblasts (NCFs) constitute a component of the stroma surrounding a tumor in an early stage of its development. NCFs can influence transformed cells via different paracrine factors, including TGF-β1. This in vitro study was undertaken to evaluate the role of NEP in CC promotion in conditions of indirect co-culture of CC cells (LS180 and SW620) with NCFs (CCD-18Co) or their conditioned medium (CM-18Co).

Methods

We examined cell proliferation (with the BrdU assay) and invasiveness (using BME-coated inserts, 8 µm) of NEP-expressing, NEP-silenced (siRNA), and NEP-inhibited (with thiorphan, i.e. a NEP specific inhibitor) CC cells cultured alone or co-cultured with CCD-18Co or with their conditioned medium. The Western blot and ELISA methods were used to assess the level of TGF-β1.

Results

The results showed that the co-culture of the NEP-depleted CC cells with NCFs or their conditioned medium resulted in a significant decrease in cell proliferation in comparison with the proliferative potential of NEP-silenced/inhibited CC cells cultivated alone. In contrast, the NEP depletion did not influence the invasiveness of CC cells in the co-cultures. The co-culture of CC cells with CCD-18Co or CM-C18Co resulted in increased synthesis of TGF-β1, while the NEP downregulation decreased the synthesis of TGF-β1 in CC cells and abolished the stimulatory effect of the co-cultures on TGF-β1 production.

Conclusions

The results suggest that the expression of NEP by colon cancer cells is essential for their proliferation and TGF-β1 synthesis during paracrine interactions with NCFs.

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Data availability

The datasets used and/or analyzed in the current study are available from the corresponding author on reasonable request.

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Funding

This work was funded by the National Science Center of Poland (grant no. 2012/07/B/NZ3/00209).

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Authors and Affiliations

  1. Faculty of Biology and Biotechnology, Department of Virology and Immunology, Maria Curie-Sklodowska University, Akademicka 19 Street, 20-033, Lublin, Poland

    M. Mizerska-Kowalska, K. Sawa-Wejksza, M. Kandefer-Szerszeń & B. Zdzisińska

  2. Faculty of Biology and Biotechnology, Department of Cell Biology, Maria Curie-Sklodowska University, Akademicka 19 Street, 20-033, Lublin, Poland

    A. Sławińska-Brych

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  1. M. Mizerska-Kowalska
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Contributions

M.M–K. conceived and designed the experiments; M.M.-K., B.Z., K.S.-W., and A.S.-B. performed the biological research; M.M.-K. and B.Z. performed analysis and interpreted the data; M.K.-Sz. and B.Z. critically revised the intellectual content of the manuscript; M.M.-K. wrote the paper.

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Correspondence to M. Mizerska-Kowalska.

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Mizerska-Kowalska, M., Sawa-Wejksza, K., Sławińska-Brych, A. et al. Neutral endopeptidase depletion decreases colon cancer cell proliferation and TGF-β1 synthesis in indirect co-cultures with normal colon fibroblasts. Clin Transl Oncol 23, 1405–1414 (2021). https://doi.org/10.1007/s12094-020-02537-x

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  • DOI: https://doi.org/10.1007/s12094-020-02537-x

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