Journal
PHARMACOLOGICAL RESEARCH
Volume 144, Issue -, Pages 99-115Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.phrs.2019.04.007
Keywords
Ecto-5 '-nucleotidase/CD73; Adenosine; A(1)R; A(2A)R; Astrocytes; Chronic neuroinflammation
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Funding
- Ministry of Education, Science and Technological Development of Republic of Serbia [III41014]
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The review summarizes available data regarding the complex regulation of CD73 at the neurovascular unit (NVU) during neuroinflammation. Based on available data we propose the biphasic pattern of CD73 regulation at NVU, with an early attenuation and a postponed up-regulation of CD73 activity. Transient attenuation of CD73 activity on leukocyte/vascular endothelium and leukocyte/astrocyte surface, required for the initiation of a neuroinflammatory response, may be effectuated either by catalytic inhibition of CD73 and/or by shedding of the CD73 molecule from the cell surface, while postponed induction of CD73 is effectuated by transcriptional upregulation of Nt5e and posttranslational modifications. Neuroinflammatory conditions are also associated with significant enhancement and gain-of-function of A(2A)R-mediated adenosine signaling. However, in contrast to the temporary prevalence of A(2A)R over A(1)R signaling during an acute inflammatory response, prolonged induction of A(2A)R and resulting perpetual CD73/A(2A)R coupling may be a contributing factors in the transition between acute and chronic neuroinflammation. Thus, pharmacological targeting of the CD73/A(2A)R axis may attenuate inflammatory response and ameliorate neurological deficits in chronic neuroinflammatory conditions.
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