Low Necroptosis Process Predicts Poor Treatment Outcome of Human Papillomavirus Positive Cervical Cancers by Decreasing Tumor-Associated Macrophages M1 Polarization

Background/Aim: The aim of this study was to assess the functions of the necroptosis process on the prognosis of high-risk human papillomavirus (HR-HPV)-related cervical cancer. Methods: PCR and western blotting were used to demonstrate the expression of the necroptosis marker, mixed lineage kinase domain-like protein (MLKL), in whole blood and peripheral blood mononuclears (PBMCs) of 89 cervical cancer patients and 15 healthy volunteers. Necroptosis levels and M1 polarization were determined in tumor co-cultured macrophages. Results: We found that MLKL expressions were significantly increased in cervical cancer patients in both whole blood and PBMC samples compared to the expressions in the healthy controls. Low MLKL expression was significantly associated with decreased survival rate in overall survival and disease-free survival. Co-culture cervical cancer cells decrease the necroptosis process of macrophage, together with the proinflammatory factors (M1 markers) downregulation, and this negative regulation was exacerbated in HPV-positive cases. Necroptosis enhancer RIPK3 overexpression showed reversed regulation of these M1 markers, suggesting that co-culture cervical cancer cells decrease the macrophage M1 polarization partly through necroptosis downregulation. Conclusion: Our study revealed that necroptosis process could be a relevant marker for the determination of the prognosis in cervical cancer patients, which might be because of its role in regulating macrophage polarization. (C) 2018 S. Karger AG, Basel