Interleukin‑8 released by cancer‑associated fibroblasts attenuates the autophagy and promotes the migration of ovarian cancer cells

Thongchot,Suyanee; Jamjuntra,Pranisa; Therasakvichya,Suwanit; Warnnissorn,Malee; Ferraresi,Alessandra; Thuwajit,Peti; Isidoro,Ciro; Thuwajit,Chanitra

doi:10.3892/ijo.2021.5194

Interleukin‑8 released by cancer‑associated fibroblasts attenuates the autophagy and promotes the migration of ovarian cancer cells

Authors:
- Suyanee Thongchot
- Pranisa Jamjuntra
- Suwanit Therasakvichya
- Malee Warnnissorn
- Alessandra Ferraresi
- Peti Thuwajit
- Ciro Isidoro
- Chanitra Thuwajit
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Affiliations: Department of Immunology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand, Department of Gynecology and Obstetrics, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand, Department of Pathology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand, Laboratory of Molecular Pathology, Department of Health Sciences, University of Eastern Piedmont ‘A. Avogadro’, I‑28100 Novara, Italy
Published online on: March 1, 2021 https://doi.org/10.3892/ijo.2021.5194
Article Number: 14
Copyright: © Thongchot et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The tumor microenvironment composed of a mixture of stromal cells and their secretions has a marked impact on cancer progression. In particular, soluble factors and metabolites contribute to malignancy through the dysregulation of autophagy in cancer cells. The present study investigated the effects of ovarian cancer‑associated fibroblasts (OVCAFs) with their secretory substances on the autophagy and migration of ovarian cancer cells. The conditioned‑medium (CM) of OVCAFs isolated from fresh human ovarian cancer tissues was analyzed for the levels of 27 common cytokines/chemokines using a cytokine array. Autophagy in cancer cells was assessed by determining the expression of the vacuolar form of LC3 by western blot analysis and immunofluorescence. Cancer cell migration was assessed by Transwell migration assay. Interleukin (IL)‑8 was found to be the most highly upregulated cytokine among the cytokines/chemokines found in the OVCAF‑CM. The role of IL‑8 in ovarian cancer cell migration and its mechanistic link with autophagy was investigated. Recombinant human IL‑8 (rhIL‑8) stimulated the migration of SKOV3 and Kuramochi ovarian cancer cells, and concurrently downregulated basal autophagy, in concentration‑dependent manner. Compared to the CM of control counterpart normal fibroblasts isolated from benign ovaries (OVNF‑CM), the CM from 3 OVCAF isolates (namely, OVCAF‑9, ‑20 and ‑43) exerted effects similar to rhIL‑8 on both cancer cell lines. The pharmacological induction of autophagy with rapamycin or metformin attenuated the pro‑migratory effects of IL‑8. Neutralizing anti‑IL‑8 antibody counteracted the inhibitory effect of OVCAF‑CM on basal autophagy. On the whole, the present study highlights the involvement of IL‑8 released by CAFs in the ovarian tumor microenvironment in promoting cancer cell migration through the suppression of autophagy.

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