A Simple Spectroscopic Method for Differentiating Cellular Uptakes of Gold Nanospheres and Nanorods from Their Mixtures

Department of Biomedical Engineering, Washington University, St. Louis, MO 63130, USA.
Angewandte Chemie International Edition (Impact Factor: 11.34). 03/2010; 49(11):1976-80. DOI: 10.1002/anie.200906584
Source: PubMed
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Gold nanorods (GNRs) are well known in photothermal therapy based on near-infrared (NIR) laser absorption of the longitudinal plasmon band. Herein, we developed an effective stimulus system -- GNRs and doxorubicin co-loaded polymersomes (P-GNRs-DOX) -- to facilitate co-therapy of photothermal and chemotherapy. DOX can be triggered to release once the polymersomes are corrupted under local hyperthermic condition of GNRs induced by NIR laser irradiation. Also, the cytotoxicity of GNRs caused by the residual cetyltrimethylacmmonium bromide (CTAB) was reduced by shielding the polymersomes. The GNRs-loaded polymersomes (P-GNRs) can be efficiently taken up by the tumor cells. The distribution of the nanomaterial was imaged by IR-820 and quantitatively analyzed by ICP-AES. We studied the ablation of tumor cells in vitro and in vivo, and found that co-therapy offers significantly improved therapeutic efficacy (tumors were eliminated without regrowth.) compared with chemotherapy or photothermal therapy alone. By TUNEL immunofluorescent staining of tumors after NIR laser irradiation, we found that the co-therapy showed more apoptotic tumor cells than the other groups. Furthermore, the toxicity study by pathologic examination of the heart tissues demonstrated a lower systematic toxicity of P-GNRs-DOX than free DOX. Thus, the chemo-photothermal treatment based on polymersomes loaded with DOX and GNRs is a useful strategy for maximizing the therapeutic efficacy and minimizing the dosage-related side effects in the treatment of solid tumors.
    Theranostics 01/2015; 5(4):345-56. DOI:10.7150/thno.10731 · 7.83 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Nanoparticles (NPs) are widely applied in nanomedicine and diagnostics based on the interactions between NPs and the basic barrier (biomembrane). Understanding the underlying mechanism of these interactions is important for enhancing their beneficial effects and avoiding potential nanotoxicity. Experimental, mathematical and numerical modeling techniques are involved in this field. This article reviews the state-of-the-art techniques in studies of NP-biomembrane interactions with a focus on each technology's advantages and disadvantages. The aim is to better understand the mechanism of NP-biomembrane interactions and provide significant guidance for various fields, such as nanomedicine and diagnosis.
    Nanomedicine 01/2015; 10(1):121-41. DOI:10.2217/nnm.14.167 · 5.82 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: We report functional gold nanoparticles (AuNP) with antibody-like ligands. These particles consist of Y-shaped ligands and AuNP. Transferrin (Tf) and Tat peptide were linked to each head of a Y-shaped poly(ethylene glycol) (PEG)-containing dopamine at one tail site. Also, Y-shaped ligands (with Tf and Tat peptide) were anchored to the surface of the AuNP as the result of noncovalent conjugation of dopamine and the AuNP. Interestingly, the partial shielding of Tat peptides by large Tf molecules rather improved Tf-mediated endocytosis of the AuNP, while minimizing the natural nonspecific cell interaction of Tat peptides. This system resulted in highly improved in vitro/in vivo tumor-selective uptake over AuNP bearing a single ligand (Tf or Tat peptides). Furthermore, this system resulted in significant enhancement of in vivo photothermal tumor cell ablation under light-irradiation conditions for AuNP. We believe that this design is a promising method to easily modify conventional antibodies or ligands to improve their disease-recognition ability.
    ACS Nano 12/2014; DOI:10.1021/nn506411q · 12.03 Impact Factor


Available from