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Updated: Jul 19, 2026
Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles
Published on: October 19, 2015
Production of novel theranostic nano-vector based on superparamagnetic iron oxide nanoparticles/miR-497 targeting
Asmaa M Elfiky1, May M Eid2, May El-Manawaty3
1Environmental and Occupational Medicine Department, Environment and Climate Change Research Institute, National Research Centre, Cairo, Egypt. am.elfiky@nrc.sci.eg.
Abstract:
Colorectal cancer (CRC) is a serious public health concern worldwide. Immune checkpoint inhibition medication is likely to remain a crucial part of CRC clinical management. This study aims to create new super paramagnetic iron oxide nano-carrier (SPION) that can effectively transport miRNA to specific CRC cell lines. In addition, evaluate the efficiency of this nano-formulation as a therapeutic candidate for CRC. Bioinformatics tools were used to select a promising tumor suppressor miRNA (mir-497-5p). Green route, using Fusarium oxyporium fungal species, manipulated for the synthesis of SPION@Ag@Cs nanocomposite as a carrier of miR-497-5p. That specifically targets the suppression of PD1/PDL1 and CTLA4pathways for colorectal therapy. UV/visible and FTIR spectroscopy, Zeta potential and MTT were used to confirm the allocation of the miR-497 on SPION@Ag@Cs and its cytotoxicity against CRC cell lines. Immunofluorescence was employed to confirm transfection of cells with miR-497@NPs, and the down- regulation of CTLA4 in HT29, and Caco2 cell lines. On the other hand, PDL1 showed a significant increase in colorectal cell lines (HT-29 and Caco-2) in response to mir497-5p@Nano treatment. The data suggest that the mir-497 -loaded SPION@Ag@Cs nano-formulation could be a good candidate for the suppression of CTLA4in CRC human cell lines. Consequently, the targeting miR-497/CTLA4 axis is a potential immunotherapy treatment strategy for CRC.
Insights
This study developed a novel SPION@Ag@Cs nanocomposite to deliver miR-497-5p for colorectal cancer (CRC) therapy. The nano-formulation effectively suppressed CTLA4, showing potential for CRC immunotherapy.
Area of Science:
- Biomedical Engineering
- Nanotechnology
- Oncology
Background:
- Colorectal cancer (CRC) poses a significant global health challenge.
- Immune checkpoint inhibitors are vital in CRC management.
- Novel drug delivery systems are needed for targeted CRC therapy.
Purpose of the Study:
- To synthesize a superparamagnetic iron oxide nano-carrier (SPION) for targeted miRNA delivery in CRC.
- To evaluate the therapeutic potential of a miR-497-5p loaded nano-formulation for colorectal cancer.
Main Methods:
- Bioinformatics identified miR-497-5p as a tumor suppressor.
- SPION@Ag@Cs nanocomposite synthesized using Fusarium oxyporium.
- Characterization via UV/visible, FTIR, Zeta potential, MTT, and immunofluorescence.
Main Results:
- Successful loading of miR-497-5p onto SPION@Ag@Cs confirmed.
- Nano-formulation demonstrated cytotoxicity against CRC cell lines.
- Down-regulation of CTLA4 observed in HT29 and Caco2 cells; PDL1 expression increased.
Conclusions:
- The miR-497-5p loaded SPION@Ag@Cs nano-formulation is a promising candidate for suppressing CTLA4 in CRC.
- Targeting the miR-497/CTLA4 axis represents a potential immunotherapy strategy for colorectal cancer.
