Affiliation:
1. Department of Public Health, School of Medicine & Holistic Integrative Medicine Nanjing University of Chinese Medicine Nanjing China
2. Yinzhou Center for Disease Control and Prevention Ningbo China
3. Department of Nutrition and Food Safety, School of Public Health Nanjing Medical University Nanjing China
Abstract
AbstractClinical treatment and preclinical studies have highlighted the role of immune checkpoint blockade in cancer treatment. Research has been devoted to developing immune checkpoint inhibitors in combination with other drugs to achieve better efficacy or reduce adverse effects. Phytochemicals sourced from vegetables and fruits have demonstrated antiproliferative, proapoptotic, anti‐migratory, and antiangiogenic effects against several cancers. Phytochemicals also modulate the tumor microenvironment such as T cells, regulatory T cells, and cytokines. Recently, several phytochemicals have been reported to modulate immune checkpoint proteins in in vivo or in vitro models. Phytochemicals decreased programmed cell death ligand‐1 expression and synergized programmed cell death receptor 1 (PD‐1) monoclonal antibody to suppress tumor growth. Combined administration of phytochemicals and PD‐1 monoclonal antibody enhanced the tumor growth inhibition as well as CD4+/CD8+ T‐cell infiltration. In this review, we discuss immune checkpoint molecules as potential therapeutic targets of cancers. We further assess the impact of phytochemicals including carotenoids, polyphenols, saponins, and organosulfur compounds on cancer PD‐1/programmed cell death ligand‐1 immune checkpoint molecules and document their combination effects with immune checkpoint inhibitors on various malignancies.
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