Abstract
Microglial dysfunction has been identified as a key factor in the pathology of several traumatic and neurodegenerative diseases in the central nervous system. Due to the importance of microglia in various pathological processes, the development of molecular tools to target microglia may be of significance for the clinical diagnosis and treatment of these disorders. In this study, a DNA aptamer, ZH-1c, that binds microglia with high affinity was developed by cell-SELEX and truncated strategies. ZH-1c exhibits promising binding ability under physiological temperatures, high serum stability after being modified, and can be internalized by microglia. Also, the binding target of ZH-1c on microglia was identified as the transmembrane protein CD64, which increased in response to inflammatory stimulation via lipopolysaccharide and interferon-gamma, thus enhancing the affinity of ZH-1c for activated microglia. Based on the above experiments, the DNA aptamer ZH-1c exhibits great potential for the targeting of activated inflammatory microglia and may be suitable as a novel and effective molecular tool for diagnosis and microglia-targeted therapies.
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