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    Area of Science:

    • Biomedical Engineering
    • Nanotechnology
    • Oncology

    Background:

    • Glioblastoma (GBM) treatment remains a significant challenge, with current therapies often proving ineffective.
    • Zoledronic acid (ZOL) shows potential for GBM treatment, but effective delivery to brain tumors is needed.

    Purpose of the Study:

    • To develop and evaluate transferrin (Tf)-targeted self-assembling nanoparticles (Tf-PLCaPZ NPs) for delivering ZOL to brain tumors, specifically GBM.
    • To compare the efficacy of Tf-PLCaPZ NPs against non-targeted nanoparticles (PLCaPZ NPs) and free ZOL in GBM models.

    Main Methods:

    • Characterization of Tf-PLCaPZ NPs for size distribution and ZOL incorporation efficiency.
    • In vitro evaluation of Tf-PLCaPZ NPs in GBM cell lines (LN229, U373MG) for cellular uptake, cytotoxicity, and combination therapy with temozolomide (TMZ).
    • In vivo assessment of Tf-PLCaPZ NPs efficacy in a mouse xenograft model of GBM.

    Main Results:

    • Tf-PLCaPZ NPs exhibited a narrow size distribution and high ZOL incorporation, with Tf reducing hemolytic activity.
    • In vitro studies demonstrated significant cellular uptake and growth inhibition of LN229 cells by Tf-PLCaPZ NPs.
    • Sequential therapy with TMZ and Tf-PLCaPZ NPs showed superior therapeutic activity compared to single treatments.
    • In vivo, Tf-PLCaPZ NPs significantly inhibited tumor growth in mice, while free TMZ was ineffective.

    Conclusions:

    • Tf-PLCaPZ NPs represent a promising novel drug delivery system for ZOL in GBM treatment.
    • Targeted nanoparticle delivery enhances ZOL's efficacy against brain tumors.
    • This approach offers a potential new strategy to improve GBM therapeutic outcomes.