Abstract
Histaminergic, orexinergic, and cannabinoid systems play a role in both physiologic and oncogenic mechanisms in digestive tissues. These three systems are important mediators of tumor transformation, as they are associated with redox alterations, which are key aspects in oncological disorders. The three systems are known to promote alterations in the gastric epithelium through intracellular signaling pathways, such as oxidative phosphorylation, mitochondrial dysfunction, and increased Akt, which might promote tumorigenesis. Histamine promotes cell transformation through redox-mediated alterations in the cell cycle, DNA repair, and immunological response. The increase in histamine and oxidative stress generates angiogenic and metastatic signals through the VEGF receptor and H2R-cAMP-PKA pathway. Immunosuppression in the presence of histamine and ROS is linked to a decrease in dendritic and myeloid cells in gastric tissue. These effects are counteracted by histamine receptor antagonists, such as cimetidine. Regarding orexins, overexpression of the Orexin 1 Receptor (OX1R) induces tumor regression through the activation of MAPK-dependent caspases and src-tyrosine. OX1R agonists are candidates for the treatment of gastric cancer by stimulating apoptosis and adhesive interactions. Lastly, cannabinoid type 2 (CB2) receptor agonists increase ROS, leading to the activation of apoptotic pathways. In contrast, cannabinoid type 1 (CB1) receptor agonists decrease ROS formation and inflammation in gastric tumors exposed to cisplatin. Overall, the repercussion of ROS modulation through these three systems on tumor activity in gastric cancer depends on intracellular and/or nuclear signals associated with proliferation, metastasis, angiogenesis, and cell death. Here, we review the role of these modulatory systems and redox alterations in gastric cancer.
Graphical Abstract
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