Inxa0vivo visualization of endogenous miR-21 using hyaluronic acid-coated graphene oxide for targeted cancer therapy.

PMID 28088076


Oncogene-targeted nucleic acid therapy has been spotlighted as a new paradigm for cancer therapeutics. However, inxa0vivo delivery issues and uncertainty of therapeutic antisense drug reactions remain critical hurdles for a successful targeted cancer therapy. In this study, we developed a fluorescence-switchable theranostic nanoplatform using hyaluronic acid (HA)-conjugated graphene oxide (GO), which is capable of both sensing oncogenic miR-21 and inhibiting its tumorigenicity simultaneously. Cy3-labeled antisense miR-21 peptide nucleic acid (PNA) probes loaded onto HA-GO (HGP21) specifically targeted CD44-positive MBA-MB231xa0cells and showed fluorescence recovery by interacting with endogenous miR-21 in the cytoplasm of the MBA-MB231xa0cells. Knockdown of endogenous miR-21 by HGP21 led to decreased proliferation and reduced migration of cancer cells, as well as the induction of apoptosis, with enhanced PTEN levels. Interestingly, inxa0vivo fluorescence signals markedly recovered 3xa0h after the intravenous delivery of HGP21 and displayed signals more than 5-fold higher than those observed in the HGPscr-treated group of tumor-bearing mice. These findings demonstrate the possibility of using the HGP nanoplatform as a cancer theranostic tool in miRNA-targeted therapy.