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Synthetic mRNA encoding therapeutic proteins is incorporated into nano-scale carrier, and administered to target cells.
In the cells, the mRNA is released into the cytoplasm, followed by protein translation using the similar machinery for the regular processes of gene expression.
This system is based on block copolymer composed of hydrophilic segment of polyethylene glycol, and hydrophobic segment of polyamino acids.
We designed the polymer structure to provide specific biofunctions such as cell targeting, drug loading and release.
We applied the mRNA-loaded nanomicelle for the treatment of cerebral ischemic diseases, which would cause various neurologic disorders.
We used a rat model of transient global ischemia, called TGI, in which neuronal death is induced specifically in the vulnerable hippocampus, with gradually progressive manner for several days.
These are the histology sections of the hippocampus after the administration of BDNF mRNA.
Very interestingly, the mRNA administration on Day 2 provided the maximal effect of neuroprotection, even compared with the administration just after the TGI.
The therapeutic effect was confirmed by a behavioral test to analyze the memory function.
Finally, we investigated the target cells of mRNA, mRNA was mostly introduced into astrocytes.