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Daunorubicin-Loaded CdTe QDs Conjugated with Anti-CD123 mAbs: A Novel Delivery System for Myelodysplastic Syndromes Treatment

Authors Guo D, Xu P, Chen D, Wang L, Zhu Y, Zuo Y, Chen B

Received 4 October 2019

Accepted for publication 9 January 2020

Published 24 January 2020 Volume 2020:15 Pages 521—536


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Linlin Sun

Dan Guo,1,2 Peipei Xu,1 Dangui Chen,1 Lili Wang,1 Yudi Zhu,1 Yifan Zuo,1 Bing Chen1

1Department of Hematology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, Jiangsu 210093, People’s Republic of China; 2Department of Hematology, The Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, People’s Republic of China

Correspondence: Bing Chen
Department of Hematology, Drum Tower Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu 210093, People’s Republic of China

Introduction: The myelodysplastic syndromes (MDS) are a very heterogeneous group of myeloid disorders characterized by peripheral blood cytopenias and increase risk of transformation to acute myeloid leukemia (AML). Daunorubicin (DNR) is an indispensable drug for the treatment of MDS and AML. However, its side effects including cardiac toxicity and bone marrow suppression severely limit clinical application. Many researches reported high expression of CD123 antigen on high-risk MDS cells, so we constructed a novel drug delivery system comprising daunorubicin-loaded CdTe QDs conjugated with anti-CD123 mAbs (DNR-CdTe-CD123) to develop targeted combination chemotherapy for MDS.
Methods: CdTe conjugated antiCD123 through amide bond, co-loaded with DNR with electrostatic bonding. Then, we determined characterization and release rate of DNR-CdTe-CD123. The therapeutic effect and side effect of drug delivery system were evaluated through in vitro and in vivo experiments.
Results: CdTe showed appropriate diameter and good dispersibility and DNR was loaded into CdTes with high encapsulation efficiency and drug loading. The maximum drug loading and encapsulation efficiency were 42.08 ± 0.64% and 74.52 ± 1.81%, respectively, at DNR concentration of 0.2mg/mL and anti-CD123 mAbs volume of 5ul (100ug/mL). Flow cytometry (FCM) showed that CD123 antigen was highly expressed on MUTZ-1 cells, and its expression rate was 72.89 ± 10.67%. In vitro experiments showed that the inhibition rate and apoptosis rate of MUTZ-1 cells treated with DNR-CdTe-CD123 were higher than those in the other groups (P< 0.05). Compared with the other groups, the level of apoptosis-related protein (P53, cleaved caspase-9, Bax and cleaved caspase-3) were upregulated in DNR-CdTe-CD123 group (P< 0.05). In vivo experiments, DNR-CdTe-CD123 can effectively inhibit the tumor growth of MDS-bearing nude mice and reduce the side effects of DNR on myocardial cells.
Conclusion: The system of DNR-CdTe-CD123 enhances the therapeutic effects and reduce the side effects of DNR, thus providing a novel platform for MDS treatment.

Keywords: myelodysplastic syndrome, daunorubicin, CdTe, anti-CD123 monoclonal antibody, drug delivery system

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