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

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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., Goncalves, K.A., Raskó, T., Pande, A., Gil, S., Liu, Z., Izsvák, Z., Papayannopoulou, T., Davis, J.C., 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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