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Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles
Published on: October 19, 2015
Tumor control by hypoxia-specific chemotargeting of iron-oxide nanoparticle - Berberine complexes in a mouse model
1Pushpagiri Institute of Medical Sciences and Research Centre, Thiruvalla 689101, India; Mar Athanasios College for Advanced Studies, Thiruvalla 689101, India.
Aim:
To evaluate the therapeutic efficacy of hypoxic cell-sensitizer Sanazole (SAN) -directed targeting of cytotoxic drug Berberine (BBN) and Iron-oxide nanoparticle (NP) complexes, to solid tumor in Swiss albino mice.
Main Methods:
NP-BBN-SAN complexes were characterized by FTIR, XRD, TEM and Nano-size analyzer. This complex was orally administered to mice-bearing solid tumor in hind limb. Tumor regression was analysed by measuring tumor volume. Cellular DNA damages were assessed by comet assay. Transcriptional expression of genes related to tumor hypoxia and apoptosis was evaluated by quantitative real-time PCR and morphological changes in tissues were analysed by histopathology. Also levels of antioxidants and tumor markers in tissues and serum biochemical parameters were analysed.
Key Findings:
Administration of NP-BBN-SAN complexes reduced tumor volume and studies were focussed on the underlying mechanisms. Extensive damage to cellular-DNA; down-regulated transcription of hif-1α, vegf, akt and bcl2; and up-regulated expression of bax and caspases, were observed in tumor. Results on tumor markers, antioxidant-status and serum parameters corroborated the molecular findings. Histopathology of tumor, liver and kidney revealed the therapeutic specificity of NP-BBN-SAN.
Significance:
Thus SAN and NP can be used for specific targeting of drugs, to hypoxic solid tumor, to improve therapeutic efficacy.
Insights
Hypoxic cell-sensitizer Sanazole (SAN) and iron-oxide nanoparticle (NP) complexes carrying Berberine (BBN) effectively targeted solid tumors in mice. This approach reduced tumor volume and enhanced therapeutic efficacy through DNA damage and apoptosis induction.
Area of Science:
- Biomedical Engineering
- Nanotechnology
- Cancer Research
Background:
- Solid tumors often exhibit hypoxia, a condition that reduces the efficacy of conventional chemotherapy.
- Targeted drug delivery systems are crucial for overcoming drug resistance and improving therapeutic outcomes in cancer treatment.
- Iron-oxide nanoparticles (NPs) offer potential for targeted delivery and imaging in cancer therapy.
Purpose of the Study:
- To evaluate the therapeutic efficacy of Berberine (BBN) and Iron-oxide Nanoparticle (NP) complexes, sensitized by Sanazole (SAN), for targeting solid tumors in a mouse model.
- To investigate the underlying mechanisms of tumor regression induced by the NP-BBN-SAN complex, focusing on DNA damage, gene expression, and tissue morphology.
- To assess the specificity and safety of the targeted complex in tumor tissues, liver, and kidneys.
Main Methods:
- NP-BBN-SAN complexes were synthesized and characterized using FTIR, XRD, TEM, and Nano-size analysis.
- The complexes were administered orally to Swiss albino mice bearing solid tumors, and tumor volume was measured.
- Gene expression (hif-1α, vegf, akt, bcl2, bax, caspases) related to hypoxia and apoptosis was analyzed using quantitative real-time PCR, alongside comet assays for DNA damage and histopathological analysis.
Main Results:
- Oral administration of NP-BBN-SAN complexes significantly reduced tumor volume in mice.
- The treatment induced extensive cellular DNA damage and modulated gene expression, down-regulating hypoxia and pro-survival genes (hif-1α, vegf, akt, bcl2) while up-regulating pro-apoptotic genes (bax, caspases).
- Histopathology confirmed the therapeutic specificity of NP-BBN-SAN in tumor tissues, with minimal observed toxicity in the liver and kidneys.
Conclusions:
- Sanazole (SAN) and iron-oxide nanoparticles (NPs) can be effectively utilized for targeted drug delivery to hypoxic solid tumors.
- The NP-BBN-SAN complex demonstrates significant therapeutic potential by enhancing drug efficacy through targeted delivery and induction of apoptosis.
- This targeted approach offers a promising strategy for improving cancer treatment outcomes, particularly for solid tumors with hypoxic microenvironments.
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