Probing a dipeptide-based supramolecular assembly as an efficient camptothecin delivering carrier for cancer therapy: computational simulations and experimental validations.

Abstract

Short peptide-based supramolecular assemblies have drawn much attention in the field of drug delivery. However, the progress still remains limited owing to the inefficient drug loading capacity of conventional short peptide-based materials. In this study, based on coordinated intramolecular π-π stacking, we customize a dipeptide-based rhein derivative (rhein-diphenylalanine peptide, RDP), which could spontaneously form spherical nanoassemblies for drug delivery. A structure-based virtual screening of a library of small molecules is conducted to identify the suitable compounds which could be effectively delivered by this nanocarrier. Sorted by binding energy results, fifteen superior and five inferior molecules are found. Subsequently, the co-assembly capacity of high-affinity molecules (camptothecin, CPT) and low-affinity molecules (norcantharidin, NCTD) with the dipeptide-based carrier is predicted via dissipative particle dynamics (DPD) simulation. Consistent with computational results, the in vitro experimental results show that CPT-encapsulated nanoassemblies have significant advantages in the particle size distribution and recrystallization-inhibitory effect compared with NCTD. Furthermore, in vivo experiments were conducted to determine whether CPT is precisely delivered to tumor sites by using the dipeptide-based nanoassemblies. The CPT-loaded nanoassemblies show better effects in terms of drug biodistribution and in vivo anti-tumor efficacy compared to free CPT. The cooperative computational and experimental strategies (in vitro and in vivo) used in this work lay a good foundation to systematically understand short peptide-based assemblies for precise drug delivery.

• Authors: Mengchi Sun , Xiangyu Zhang , Zisen Gao , Tian Liu , Cong Luo , Yongshan Zhao , Yun Liu , Zhonggui He , Jian Wang , Jin Sun
• Journal: Nanoscale (Nanoscale) Vol. 11 Issue 9 Pg. 3864-3876 (Feb 28 2019) ISSN: 2040-3372 [Electronic] England
• PMID: 30758022 (Publication Type: Journal Article)

Chemical References

• Antineoplastic Agents, Phytogenic
• Dipeptides
• Drug Carriers
• Camptothecin

Topics

• Animals
• Antineoplastic Agents, Phytogenic (chemistry, pharmacology, therapeutic use)
• Binding Sites
• Camptothecin (chemistry, pharmacology, therapeutic use)
• Cell Line, Tumor
• Cell Survival (drug effects)
• Dipeptides (chemistry)
• Drug Carriers (chemistry)
• Female
• Humans
• Mice
• Mice, Inbred BALB C
• Mice, Nude
• Microscopy, Confocal
• Molecular Docking Simulation
• Nanoparticles (chemistry)
• Neoplasms (drug therapy, pathology)
• Optical Imaging
• Transplantation, Heterologous