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Title: Nano-gold corking and enzymatic uncorking of carbon nanotube cups

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/ja511843w· OSTI ID:1186638
 [1];  [1];  [1];  [2];  [1];  [3];  [3];  [1];  [1]
  1. Univ. of Pittsburgh, Pittsburgh, PA (United States)
  2. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
  3. Univ. of Pittsburgh Medical Center, Pittsburgh, PA (United States)

Because of their unique stacked, cup-shaped, hollow compartments, nitrogen-doped carbon nanotube cups (NCNCs) have promising potential as nanoscale containers. Individual NCNCs are isolated from their stacked structure through acid oxidation and subsequent probe-tip sonication. The NCNCs are then effectively corked with gold nanoparticles (GNPs) by sodium citrate reduction with chloroauric acid, forming graphitic nanocapsules with significant surface-enhanced Raman signature. Mechanistically, the growth of the GNP corks starts from the nucleation and welding of gold seeds on the open rims of NCNCs enriched with nitrogen functionalities, as confirmed by density functional theory calculations. A potent oxidizing enzyme of neutrophils, myeloperoxidase (MPO), can effectively open the corked NCNCs through GNP detachment, with subsequent complete enzymatic degradation of the graphitic shells. Lastly, this controlled opening and degradation was further carried out in vitro with human neutrophils. In addition, the GNP-corked NCNCs were demonstrated to function as novel drug delivery carriers, capable of effective (i) delivery of paclitaxel to tumor-associated myeloid-derived suppressor cells (MDSC), (ii) MPO-regulated release, and (iii) blockade of MDSC immunosuppressive potential.

Research Organization:
National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
0954345; R01CA154369; R01ES019304; NIOSH OH008282; HL114453; U19 AI068021
OSTI ID:
1186638
Report Number(s):
A-UNIV-PUB-122
Journal Information:
Journal of the American Chemical Society, Vol. 137, Issue 2; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Cited By (6)

Characterizing the Cellular Response to Nitrogen-Doped Carbon Nanocups journal June 2019
Single wall carbon nanotube (SWCNT)–gold nanorod (AuNR) conjugates via thermally-mild reaction conditions journal January 2017
Targeting myeloid regulators by paclitaxel-loaded enzymatically degradable nanocups journal January 2018
Dispersibility-Dependent Biodegradation of Graphene Oxide by Myeloperoxidase journal May 2015
In vivo degeneration and the fate of inorganic nanoparticles journal January 2016
In vitro controlled release of cisplatin from gold-carbon nanobottles via cleavable linkages journal December 2015