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Small molecule PZL318: forming fluorescent nanoparticles capable of tracing their interactions with cancer cells and activated platelets, slowing tumor growth and inhibiting thrombosis

Authors Li S, Wang Y, Wang F, Wang Y, Zhang X, Zhao M, Feng Q, Wu J, Zhao S, Wu W, Peng S

Received 6 May 2015

Accepted for publication 13 June 2015

Published 24 August 2015 Volume 2015:10(1) Pages 5273—5292


Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Chang Liu

Peer reviewer comments 3

Editor who approved publication: Prof. Dr. Thomas J Webster

Shan Li,1 Yuji Wang,1 Feng Wang,1 Yaonan Wang,1 Xiaoyi Zhang,1 Ming Zhao,1,2 Qiqi Feng,1 Jianhui Wu,1 Shurui Zhao,1 Wei Wu,3 Shiqi Peng1

Beijing Area Major Laboratory of Peptide and Small Molecular Drugs, Beijing Laboratory of Biomedical Materials, Engineering Research Center of Endogenous Prophylactic of Ministry of Education of China, College of Pharmaceutical Sciences of Capital Medical University, Beijing, People’s Republic of China; 2Department of Biomedical Science and Environmental Biology, Kaohsiung Medical University, Kaohsiung, Taiwan; 3College of Basic Medicine of Capital Medical University, Beijing, People’s Republic of China

Abstract: Low selectivity of chemotherapy correlates with poor outcomes of cancer patients. To improve this issue, a novel agent, N-(1-[3-methoxycarbonyl-4-hydroxyphenyl]-β-carboline-3-carbonyl)-Trp-Lys-OBzl (PZL318), was reported here. The transmission electron microscopy, scanning electron microscopy, and atomic force microscopy images demonstrated that PZL318 can form nanoparticles. Fluorescent and confocal images visualized that PZL318 formed fluorescent nanoparticles capable of targeting cancer cells and tracing their interactions with cancer cells. In vitro, 40 µM of PZL318 inhibited the proliferation of tumorigenic cells, but not nontumorigenic cells. In vivo, 10 nmol/kg of PZL318 slowed the tumor growth of S180 mice and alleviated the thrombosis of ferric chloride-treated ICR mice, while 100 µmol/kg of PZL318 did not injure healthy mice and they exhibited no liver toxicity. By analyzing Fourier transform–mass spectrometry and rotating-frame Overhauser spectroscopy (ROESY) two-dimensional nuclear magnetic resonance spectra, the chemical mechanism of PZL318-forming trimers and nanoparticles was explored. By using mesoscale simulation, a nanoparticle of 3.01 nm in diameter was predicted containing 13 trimers. Scavenging free radicals, downregulating sP-selectin expression and intercalating toward DNA were correlated with the antitumor mechanism of PZL318.

Keywords: nanoparticles, cancer target, sP-selectin, nanomechanism, action mechanism, fluorescent tracer

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