Single-dose MGTA-145/plerixafor leads to efficient mobilization and in vivo transduction of HSCs with thalassemia correction in mice

Item Type:	Article
Title:	Single-dose MGTA-145/plerixafor leads to efficient mobilization and in vivo transduction of HSCs with thalassemia correction in mice
Creators Name:	Li, C. and Goncalves, K.A. and Raskó, T. and Pande, A. and Gil, S. and Liu, Z. and Izsvák, Z. and Papayannopoulou, T. and Davis, J.C. and Kiem, H.P. and Lieber, A.
Abstract:	We have developed an in vivo hemopoietic stem cell (HSC) gene therapy approach without the need for myelosuppressive conditioning and autologous HSC transplantation. It involves HSC mobilization and IV injection of a helper-dependent adenovirus HDAd5/35++ vector system. The current mobilization regimen consists of granulocyte colony-stimulating factor (G-CSF) injections over a 4-day period, followed by the administration of plerixafor/AMD3100. We tested a simpler, 2-hour, G-CSF-free mobilization regimen using truncated GRO-β (MGTA-145; a CXCR2 agonist) and plerixafor in the context of in vivo HSC transduction in mice. The MGTA-145+plerixafor combination resulted in robust mobilization of HSCs. Importantly, compared with G-CSF+plerixafor, MGTA-145+plerixafor led to significantly less leukocytosis and no elevation of serum interleukin-6 levels and was thus likely to be less toxic. With both mobilization regimens, after in vivo selection with O6-benzylguanine (O6BG)/BCNU, stable GFP marking was achieved in >90% of peripheral blood mononuclear cells. Genome-wide analysis showed random, multiclonal vector integration. In vivo HSC transduction after mobilization with MGTA-145+plerixafor in a mouse model for thalassemia resulted in >95% human γ-globin+ erythrocytes at a level of 36% of mouse β-globin. Phenotypic analyses showed a complete correction of thalassemia. The γ-globin marking percentage and level were maintained in secondary recipients, further demonstrating that MGTA145+plerixafor mobilizes long-term repopulating HSCs. Our study indicates that brief exposure to MGTA-145+plerixafor may be advantageous as a mobilization regimen for in vivo HSC gene therapy applications across diseases, including thalassemia and sickle cell disease.
Keywords:	Granulocyte Colony-Stimulating Factor, Plerixafor, Thalassemia, Gene Therapy, Globins, Spatial Vectors, Animals, Mice
Source:	Blood Advances
ISSN:	2473-9529
Publisher:	American Society of Hematology
Volume:	5
Number:	5
Page Range:	1239-1249
Date:	9 March 2021
Additional Information:	Copyright © 2021 by The American Society of Hematology
Official Publication:	https://doi.org/10.1182/bloodadvances.2020003714
External Fulltext:	View full text on PubMed Central
PubMed:	View item in PubMed

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