Selenocompound metabolism

Selenocompound metabolism encompasses the complex biochemical routes through which dietary selenium is transformed into selenophosphate and subsequently selenocysteine for incorporation into selenoproteins (KEGG: hsa00450). Key enzymes within this pathway, such as glutathione peroxidases (GPX) and thioredoxin reductases (TXNRD), are vital for maintaining cellular redox balance, regulating thyroid hormone activity, and protecting cells from oxidative stress (PubMed: 24395026). Dysregulation of selenium metabolism is linked to numerous human pathologies, including Keshan disease, Kashin-Beck disease, and increased susceptibility to various cancers (PubMed: 32416140). Pharmacological modulation of this pathway involves either selenium supplementation to restore selenoprotein function or the use of inhibitors like auranofin, which targets TXNRD to induce apoptosis in cancer cells (PubMed: 28438114). Due to the narrow margin between nutritional requirement and systemic toxicity, known as selenosis, therapeutic interventions must be carefully monitored to avoid adverse effects (PubMed: 22699301). This metabolic network is not a single molecular target but rather a collection of enzymatic processes that dictate the biological availability and functionality of selenium.

Other names

Selenium metabolismSelenoprotein synthesis pathwaySelenocysteine metabolismMetabolism of selenocompounds

Pharmacological agents targeting this pathway function through the inhibition of key redox enzymes, such as thioredoxin reductase, to promote oxidative stress in malignant cells, or through the supplementation of selenium substrates to enhance the synthesis and antioxidant activity of essential selenoproteins.