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Front. Pharmacol. | doi: 10.3389/fphar.2018.00153

UNVEILING THE ROLE OF ECTO-5′-NUCLEOTIDASE/CD73 IN ASTROCYTE MIGRATION BY USING PHARMACOLOGICAL TOOLS

  • 1General Physiology and Biophysics, Faculty of Biology, University of Belgrade, Serbia
  • 2Centre for Laser Microscopy, Institute for Physiology and Biochemistry,, Faculty of Biology, University of Belgrade, Serbia

CD73 is a bifunctional glycosylphosphatidylinositol (GPI)-anchored membrane protein which functions as ecto-5′-nucleotidase and a membrane receptor for extracellular matrix protein (ECM). A large body of evidence demonstrates a critical involvement of altered purine metabolism and particularly, increased expression of CD73 in a number of human disorders, including cancer and immunodeficiency. Massive up-regulation of CD73 was also found in reactive astrocytes in several experimental models of human neuropathologies. In all the pathological contexts studied so far, the increased expression of CD73 has been associated with the altered ability of cells to adhere and/or migrate. Thus, we hypothesized that increased expression of CD73 in reactive astrocytes has a role in the process of astrocyte adhesion and migration. In the present study, the involvement of CD73 in astrocyte migration was investigated in the scratch wound assay (SW), using primary astrocyte culture prepared from neonatal rat cortex. The cultures were treated with one of the following pharmacological inhibitors which preferentially target individual functions of CD73: a) α,β-methylene ADP (APCP), which inhibits the catalytic activity of CD73 b) polyclonal anti-CD73 antibodies, which bind to the internal epitope of CD73 molecule and mask their surface exposure and c) small interfering CD73-RNA (siCD73), which silences the expression of CD73 gene. It was concluded that approaches that reduce surface expression of CD73 increase migration velocity and promote wound closure in the scratch wound assay, while inhibition of the enzyme activity by APCP induces redistribution of CD73 molecules at the cell surface, thus indirectly affecting cell adhesion and migration. Application of anti-CD73 antibodies induces a decrease in CD73 activity and membrane expression, through CD73 molecules shedding and their release to the culture media. In addition, all applied pharmacological inhibitors differentially affect other aspects of astrocyte function in vitro, including reduced cell proliferation, altered expression of adenosine receptors and increased expression of ERK1/2. Altogether these data imply that CD73 participates in cell adhesion/migration and transmits extracellular signals through interactions with ECM.

Keywords: ecto-5’-nucleotidase, CD73, Reactive astrocytes, Cell Adhesion, cell migration, Cell Migration Assays

Received: 16 Nov 2017; Accepted: 13 Feb 2018.

Edited by:

Francisco Ciruela, Universitat de Barcelona, Spain

Reviewed by:

Gourav Roy Choudhury, Texas Biomedical Research Institute, United States
Carla Cicala, University of Naples Federico II, Italy  

Copyright: © 2018 Nedeljkovic and Adzic. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Prof. Nadezda Nedeljkovic, Faculty of Biology, University of Belgrade, General Physiology and Biophysics, Studentski trg 3, Belgrade, 11001, Serbia, nnedel@bio.bg.ac.rs