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Octa-ammonium POSS-conjugated single-walled carbon nanotubes as vehicles for targeted delivery of paclitaxel.

Naderi N, Madani SY, Mosahebi A, Seifalian AM - Nano Rev (2015)

Bottom Line: Increased cell death was observed with PTX-POSS-SWCNT, PTX-POSS-Ab-SWCNT, and free PTX compared to functionalized-SWCNT (f-SWCNT), POSS-SWCNT, and cell-only controls at 48 and 72 h time intervals in both cell lines.At all time intervals, there was no significant cell death in the POSS-SWCNT samples compared to cell-only controls.This important finding indicates successful release of PTX from the nanocomposites and further reiterates the potential of SWCNTs to deliver drugs directly to targeted cells and tissues.

View Article: PubMed Central - PubMed

Affiliation: UCL Centre for Nanotechnology & Regenerative Medicine, University College London, London, UK.

ABSTRACT

Background: Carbon nanotubes (CNTs) have unique physical and chemical properties. Furthermore, novel properties can be developed by attachment or encapsulation of functional groups. These unique properties facilitate the use of CNTs in drug delivery. We developed a new nanomedicine consisting of a nanocarrier, cell-targeting molecule, and chemotherapeutic drug and assessed its efficacy in vitro.

Methods: The efficacy of a single-walled carbon nanotubes (SWCNTs)-based nanoconjugate system is assessed in the targeted delivery of paclitaxel (PTX) to cancer cells. SWCNTs were oxidized and reacted with octa-ammonium polyhedral oligomeric silsesquioxanes (octa-ammonium POSS) to render them biocompatible and water dispersable. The functionalized SWCNTs were loaded with PTX, a chemotherapeutic agent toxic to cancer cells, and Tn218 antibodies for cancer cell targeting. The nanohybrid composites were characterized with transmission electron microscopy (TEM), Fourier transform infrared (FTIR), and ultraviolet-visible-near-infrared (UV-Vis-NIR). Additionally, their cytotoxic effects on Colon cancer cell (HT-29) and Breast cancer cell (MCF-7) lines were assessed in vitro.

Results: TEM, FTIR, and UV-Vis-NIR studies confirmed side-wall functionalization of SWCNT with COOH-groups, PTX, POSS, and antibodies. Increased cell death was observed with PTX-POSS-SWCNT, PTX-POSS-Ab-SWCNT, and free PTX compared to functionalized-SWCNT (f-SWCNT), POSS-SWCNT, and cell-only controls at 48 and 72 h time intervals in both cell lines. At all time intervals, there was no significant cell death in the POSS-SWCNT samples compared to cell-only controls.

Conclusion: The PTX-based nanocomposites were shown to be as cytotoxic as free PTX. This important finding indicates successful release of PTX from the nanocomposites and further reiterates the potential of SWCNTs to deliver drugs directly to targeted cells and tissues.

No MeSH data available.


Related in: MedlinePlus

UV–Vis–NIR spectra for PTX–Ab–SWCVNT and PTX–SWCNT conjugates, −COOH functionalized SWCNTs, pristine SWCNTs, and free PTX. The peak at 270 nm is suggestive of side-wall functionalization of SWCNT with PTX and antibody.
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Figure 0004: UV–Vis–NIR spectra for PTX–Ab–SWCVNT and PTX–SWCNT conjugates, −COOH functionalized SWCNTs, pristine SWCNTs, and free PTX. The peak at 270 nm is suggestive of side-wall functionalization of SWCNT with PTX and antibody.

Mentions: The peak at 270 nm is suggestive of sidewall functionalization of SWCNTs with PTX and the antibody (Fig. 4).


Octa-ammonium POSS-conjugated single-walled carbon nanotubes as vehicles for targeted delivery of paclitaxel.

Naderi N, Madani SY, Mosahebi A, Seifalian AM - Nano Rev (2015)

UV–Vis–NIR spectra for PTX–Ab–SWCVNT and PTX–SWCNT conjugates, −COOH functionalized SWCNTs, pristine SWCNTs, and free PTX. The peak at 270 nm is suggestive of side-wall functionalization of SWCNT with PTX and antibody.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4565064&req=5

Figure 0004: UV–Vis–NIR spectra for PTX–Ab–SWCVNT and PTX–SWCNT conjugates, −COOH functionalized SWCNTs, pristine SWCNTs, and free PTX. The peak at 270 nm is suggestive of side-wall functionalization of SWCNT with PTX and antibody.
Mentions: The peak at 270 nm is suggestive of sidewall functionalization of SWCNTs with PTX and the antibody (Fig. 4).

Bottom Line: Increased cell death was observed with PTX-POSS-SWCNT, PTX-POSS-Ab-SWCNT, and free PTX compared to functionalized-SWCNT (f-SWCNT), POSS-SWCNT, and cell-only controls at 48 and 72 h time intervals in both cell lines.At all time intervals, there was no significant cell death in the POSS-SWCNT samples compared to cell-only controls.This important finding indicates successful release of PTX from the nanocomposites and further reiterates the potential of SWCNTs to deliver drugs directly to targeted cells and tissues.

View Article: PubMed Central - PubMed

Affiliation: UCL Centre for Nanotechnology & Regenerative Medicine, University College London, London, UK.

ABSTRACT

Background: Carbon nanotubes (CNTs) have unique physical and chemical properties. Furthermore, novel properties can be developed by attachment or encapsulation of functional groups. These unique properties facilitate the use of CNTs in drug delivery. We developed a new nanomedicine consisting of a nanocarrier, cell-targeting molecule, and chemotherapeutic drug and assessed its efficacy in vitro.

Methods: The efficacy of a single-walled carbon nanotubes (SWCNTs)-based nanoconjugate system is assessed in the targeted delivery of paclitaxel (PTX) to cancer cells. SWCNTs were oxidized and reacted with octa-ammonium polyhedral oligomeric silsesquioxanes (octa-ammonium POSS) to render them biocompatible and water dispersable. The functionalized SWCNTs were loaded with PTX, a chemotherapeutic agent toxic to cancer cells, and Tn218 antibodies for cancer cell targeting. The nanohybrid composites were characterized with transmission electron microscopy (TEM), Fourier transform infrared (FTIR), and ultraviolet-visible-near-infrared (UV-Vis-NIR). Additionally, their cytotoxic effects on Colon cancer cell (HT-29) and Breast cancer cell (MCF-7) lines were assessed in vitro.

Results: TEM, FTIR, and UV-Vis-NIR studies confirmed side-wall functionalization of SWCNT with COOH-groups, PTX, POSS, and antibodies. Increased cell death was observed with PTX-POSS-SWCNT, PTX-POSS-Ab-SWCNT, and free PTX compared to functionalized-SWCNT (f-SWCNT), POSS-SWCNT, and cell-only controls at 48 and 72 h time intervals in both cell lines. At all time intervals, there was no significant cell death in the POSS-SWCNT samples compared to cell-only controls.

Conclusion: The PTX-based nanocomposites were shown to be as cytotoxic as free PTX. This important finding indicates successful release of PTX from the nanocomposites and further reiterates the potential of SWCNTs to deliver drugs directly to targeted cells and tissues.

No MeSH data available.


Related in: MedlinePlus