Abstract
Alpha-fetoprotein is a shuttle protein that delivers nutrients through receptor-mediated endocytosis to embryotic cells. In adults, alpha-fetoprotein can shuttle drugs into alpha-fetoprotein receptor-positive myeloid-derived suppressor, regenerating and also cancer cells. Drugs with high-binding affinity to alpha-fetoprotein can activate or deplete targeted cells. Myeloid-derived suppressor cells activation leads to immune suppression that can be used for treating autoimmune diseases. On the other hand, toxins delivered by alpha-fetoprotein can damage myeloid-derived suppressor cells and consequently unleash innate and adaptive immunity to destroy cancer cells. Innate immunity natural killers reduce cancer stem cells and metastases. The new alpha-fetoprotein drug noncovalent complexes for immunotherapy change the local immune balance and has potential in oncology, autoimmune and infectious diseases treatment, inflammation, transplantation, vaccination, etc.
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