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Cells 2015, 4(3), 520-537; doi:10.3390/cells4030520

NAD+-Metabolizing Ectoenzymes in Remodeling Tumor–Host Interactions: The Human Myeloma Model

1
Laboratory of Immunogenetics, Department of Medical Sciences, University of Torino, Torino 10126, Italy
2
CeRMS, University of Torino, Torino 10126, Italy
3
Laboratory of Oncology, Istituto Giannina Gaslini, Genova 16148, Italy
4
Myeloma Unit, Department of Clinical and Experimental Medicine, University of Parma, Parma 43126, Italy
5
Antibody & Vaccine Group, Cancer Sciences Unit, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK
6
School of Biosciences and Veterinary Medicine, University of Camerino, Camerino 62032, Italy
7
Janssen Research & Development, LLC, Springhouse, PA 19477, USA
*
Authors to whom correspondence should be addressed.
Academic Editor: Ross Grant
Received: 4 August 2015 / Revised: 9 September 2015 / Accepted: 14 September 2015 / Published: 17 September 2015
(This article belongs to the Special Issue NAD+ Metabolism and Signaling)
View Full-Text   |   Download PDF [1576 KB, uploaded 17 September 2015]   |  

Abstract

Nicotinamide adenine dinucleotide (NAD+) is an essential co-enzyme reported to operate both intra- and extracellularly. In the extracellular space, NAD+ can elicit signals by binding purinergic P2 receptors or it can serve as the substrate for a chain of ectoenzymes. As a substrate, it is converted to adenosine (ADO) and then taken up by the cells, where it is transformed and reincorporated into the intracellular nucleotide pool. Nucleotide-nucleoside conversion is regulated by membrane-bound ectoenzymes. CD38, the main mammalian enzyme that hydrolyzes NAD+, belongs to the ectoenzymatic network generating intracellular Ca2+-active metabolites. Within this general framework, the extracellular conversion of NAD+ can vary significantly according to the tissue environment or pathological conditions. Accumulating evidence suggests that tumor cells exploit such a network for migrating and homing to protected areas and, even more importantly, for evading the immune response. We report on the experience of this lab to exploit human multiple myeloma (MM), a neoplastic expansion of plasma cells, as a model to investigate these issues. MM cells express high levels of surface CD38 and grow in an environment prevalently represented by closed niches hosted in the bone marrow (BM). An original approach of this study derives from the recent use of the clinical availability of therapeutic anti-CD38 monoclonal antibodies (mAbs) in perturbing tumor viability and enzymatic functions in conditions mimicking what happens in vivo. View Full-Text
Keywords: NAD+; CD38; ectoenzymes; adenosine; multiple myeloma; Daratumumab NAD+; CD38; ectoenzymes; adenosine; multiple myeloma; Daratumumab
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Horenstein, A.L.; Chillemi, A.; Quarona, V.; Zito, A.; Roato, I.; Morandi, F.; Marimpietri, D.; Bolzoni, M.; Toscani, D.; Oldham, R.J.; Cuccioloni, M.; Sasser, A.K.; Pistoia, V.; Giuliani, N.; Malavasi, F. NAD+-Metabolizing Ectoenzymes in Remodeling Tumor–Host Interactions: The Human Myeloma Model. Cells 2015, 4, 520-537.

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