Bone marrow MSC from pediatric patients with B-ALL highly immunosuppress T-cell responses but do not compromise CD19-CAR T-cell activity
Zanetti, S. R. (Institut Germans Trias i Pujol. Institut de Recerca contra la Leucèmia Josep Carreras)
Romecín, Paola Alejandra (Institut Germans Trias i Pujol. Institut de Recerca contra la Leucèmia Josep Carreras)
Vinyoles, Meritxell (Institut Germans Trias i Pujol. Institut de Recerca contra la Leucèmia Josep Carreras)
Juan, Manel (Hospital Clínic i Provincial de Barcelona)
Fuster, José Luis (Instituto Murciano de Investigación Biosanitaria)
Camós, Mireia (Centro de Investigación Biomédica en Red de Enfermedades Raras)
Querol, Sergi (Blood and Tissue Bank)
Delgado, M. (Instituto de Parasitología y Biomedicina "López-Neyra")
Menéndez Bujan, Pablo (Institut Germans Trias i Pujol. Institut de Recerca contra la Leucèmia Josep Carreras)
Universitat Autònoma de Barcelona

Date:	2020
Abstract:	Background Although adoptive transfer of CD19-directed chimeric antigen receptor (CAR) T-cells (CD19-CAR T-cells) achieves high rates of complete response in patients with B-cell acute lymphoblastic leukemia (B-ALL), relapse is common. Bone marrow (BM) mesenchymal stem/stromal cells (BM-MSC) are key components of the hematopoietic niche and are implicated in B-ALL pathogenesis and therapy resistance. MSC exert an immunosuppressive effect on T-cells; however, their impact on CD19-CAR T-cell activity is understudied. Methods We performed a detailed characterization of BM-MSC from pediatric patients with B-ALL (B-ALL BM-MSC), evaluated their immunomodulatory properties and their impact on CD19-CAR T-cell activity in vitro using microscopy, qRT-PCR, ELISA, flow cytometry analysis and in vivo using a preclinical model of severe colitis and a B-ALL xenograft model. Results While B-ALL BM-MSC were less proliferative than those from age-matched healthy donors (HD), the morphology, immunophenotype, differentiation potential and chemoprotection was very similar. Likewise, both BM-MSC populations were equally immunosuppressive in vitro and anti-inflammatory in an in vivo model of severe colitis. Interestingly, BM-MSC failed to impair CD19-CAR T-cell cytotoxicity or cytokine production in vitro using B-ALL cell lines and primary B-ALL cells. Finally, the growth of NALM6 cells was controlled in vivo by CD19-CAR T-cells irrespective of the absence/presence of BM-MSC. Conclusions Collectively, our data demonstrate that pediatric B-ALL and HD BM-MSC equally immunosuppress T-cell responses but do not compromise CD19-CAR T-cell activity.
Grants:	European Commission 646903 European Commission 811220 Ministerio de Economía y Competitividad SAF2016-80481R
Note:	Altres ajuts Funding Financial support for this work was obtained from the Obra Social La Caixa (LCF/PR/HR19/52160011), the Leo Messi Foundation, and the 'Heroes hasta la médula' initiative to PM. SRZ was supported by a Marie Sklodowska Curie Fellowship (GA 795833). MV is supported by a Juan de la Cierva fellowship from the MINECO. PM is an investigator of the Spanish Cell Therapy cooperative network (TERCEL).
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Cell engineering ; Immunomodulation ; Immunotherapy ; Inflammation ; Tumor microenvironment
Published in:	Journal for immunotherapy of cancer, Vol. 8 Núm. 2 (31 2020) , p. e001419, ISSN 2051-1426

DOI: 10.1136/jitc-2020-001419
PMID: 32868394

13 p, 5.4 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Health sciences and biosciences > Institut d'Investigació en Ciencies de la Salut Germans Trias i Pujol (IGTP) > Josep Carreras Leukaemia Research Institute
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Articles > Published articles