Implications of Hydrogen Sulfide in Colorectal Cancer: Mechanistic Insights and Diagnostic and Therapeutic Strategies
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Hydrogen sulfide (HS) is an important signaling molecule in colorectal cancer (CRC). It is produced in the colon by the catalytic synthesis of the colonocytes' enzymatic systems and the release of intestinal microbes, and is oxidatively metabolized in the colonocytes' mitochondria. Both endogenous HS in colonic epithelial cells and exogenous HS in intestinal lumen contribute to the onset and progression of CRC. The up-regulation of endogenous synthetases is thought to be the cause of the elevated HS levels in CRC cells. Different diagnostic probes and combination therapies, as well as tumor treatment approaches through HS modulation, have been developed in recent years and have become active area of investigation for the diagnosis and treatment of CRC. In this review, we focus on the specific mechanisms of HS production and oxidative metabolism as well as the function of HS in the occurrence, progression, diagnosis, and treatment of CRC. We also discuss the present challenges and provide insights into the future research of this burgeoning field.
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