4.7 Article

Polypeptide-Grafted Nanodiamonds for Controlled Release of Melittin to Treat Breast Cancer

Journal

ACS MACRO LETTERS
Volume 6, Issue 8, Pages 796-801

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsmacrolett.7b00389

Keywords

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Funding

  1. Australian Research Council's Discovery Early Career Researcher Award [DE140100318]
  2. Australian Research Council's Discovery Project [DP140100240]
  3. Australian Research Council [DE140100318] Funding Source: Australian Research Council

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A peptide vector consisting of nanodiamonds (NDs) and PEGylated polyglutamic acid (ND@PLGPEG-co-PLGA) has been designed and developed. The negative charges at the surface of the vector were exploited to bind a positively charged peptide drug melittin via electrostatic interaction. The surface was saturated when the weight ratio of ND@PLGPEG-co-PLGA to melittin (MEL) was S to 1. The desorption of melittin from the surface was controlled by pH, with almost no melittin released from the nanoparticles under physiological pH conditions in 2 days. However, steady release was detected in an acidic environment. The preserved structure and activity of bound melittin were demonstrated by the HPLC and 2D MCF-7 cell culture models, respectively. The bound melittin exhibited improved toxicity toward MCF-7 cells dependent on the concentration of MEL in NDs. Our results suggested that the negatively charged polymer coated NDs were able to release the cargo upon exposure to breast cancer cells.

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