Potential roles of adenosine deaminase-2 in diabetic retinopathy

Nehal M. Elsherbiny, Mohammad Naime, Saif Ahmad, Ahmed M. Elsherbini, Shuaib Mohammad, Sadanand Fulzele, Azza B. El-Remessy, Mohammed M. Al-Gayyar, Laila A. Eissa, Mamdouh M. El-Shishtawy, Guichun Han, Richard White, Toque Flores Haroldo, Gregory I. Liou

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The early activation of microglia that induces retinal inflammation in DR may serve as a target for therapeutic intervention of DR. Our demonstration that retinal inflammation is attenuated via adenosine receptor A2AAR supports the hypothesis that a mechanism to maintain extracellular concentrations of adenosine important in normal physiology is impaired in DR. Extracellular concentrations of adenosine are regulated by the interplay of equiliberative nucleoside transporter (ENT)s with enzymes of adenosine metabolism including adenosine deaminase-1 (ADA1), adenosine kinase (AK) and CD73. In the vertebrates but not rodents, a macrophage-associated ADA2 is identified. The role of ADA2 is, therefore, understudied as the sequencing probes or antibodies to mouse ADA2 are not available. We identified increased ADA2 expression and activity in human and porcine retinas with diabetes, and in Amadori glycated albumin (AGA)- or hyperglycemia-treated porcine and human microglia. In rodent as well as porcine cells, modulation of TNF-α release is mediated by A2AAR. Quantitative analysis of normal and diabetic porcine retinas reveals that while the expression levels of ADA2, A2AAR, ENT1, TNF-α and MMP9 are increased, the levels of AK are reduced during inflammation as an endogenous protective mechanism. To determine the role of ADA2, we found that AGA induces ADA2 expression, ADA2 activity and TNF-α release, and that TNF-α release is blocked by ADA2-neutralizing antibody or ADA2 siRNA, but not by scrambled siRNA. These results suggest that retinal inflammation in DR is mediated by ADA2, and that the anti-inflammatory activity of A2AAR signaling is impaired in diabetes due to increased ADA2 activity.

Original languageEnglish (US)
Pages (from-to)355-361
Number of pages7
JournalBiochemical and Biophysical Research Communications
Volume436
Issue number3
DOIs
StatePublished - Jul 5 2013

Fingerprint

Adenosine Deaminase
Diabetic Retinopathy
Adenosine Kinase
Adenosine
Swine
Medical problems
Inflammation
Small Interfering RNA
Microglia
Nucleoside Transport Proteins
Retina
Rodentia
Purinergic P1 Receptors
Macrophages
Physiology
Neutralizing Antibodies
Metabolism
Anti-Inflammatory Agents
Demonstrations
Chemical activation

Keywords

  • Adenosine deaminase-2
  • Adenosine kinase inhibitor
  • Adenosine receptor signaling
  • Diabetic retinopathy

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Elsherbiny, N. M., Naime, M., Ahmad, S., Elsherbini, A. M., Mohammad, S., Fulzele, S., ... Liou, G. I. (2013). Potential roles of adenosine deaminase-2 in diabetic retinopathy. Biochemical and Biophysical Research Communications, 436(3), 355-361. https://doi.org/10.1016/j.bbrc.2013.05.023

Potential roles of adenosine deaminase-2 in diabetic retinopathy. / Elsherbiny, Nehal M.; Naime, Mohammad; Ahmad, Saif; Elsherbini, Ahmed M.; Mohammad, Shuaib; Fulzele, Sadanand; El-Remessy, Azza B.; Al-Gayyar, Mohammed M.; Eissa, Laila A.; El-Shishtawy, Mamdouh M.; Han, Guichun; White, Richard; Haroldo, Toque Flores; Liou, Gregory I.

In: Biochemical and Biophysical Research Communications, Vol. 436, No. 3, 05.07.2013, p. 355-361.

Research output: Contribution to journalArticle

Elsherbiny, NM, Naime, M, Ahmad, S, Elsherbini, AM, Mohammad, S, Fulzele, S, El-Remessy, AB, Al-Gayyar, MM, Eissa, LA, El-Shishtawy, MM, Han, G, White, R, Haroldo, TF & Liou, GI 2013, 'Potential roles of adenosine deaminase-2 in diabetic retinopathy', Biochemical and Biophysical Research Communications, vol. 436, no. 3, pp. 355-361. https://doi.org/10.1016/j.bbrc.2013.05.023
Elsherbiny, Nehal M. ; Naime, Mohammad ; Ahmad, Saif ; Elsherbini, Ahmed M. ; Mohammad, Shuaib ; Fulzele, Sadanand ; El-Remessy, Azza B. ; Al-Gayyar, Mohammed M. ; Eissa, Laila A. ; El-Shishtawy, Mamdouh M. ; Han, Guichun ; White, Richard ; Haroldo, Toque Flores ; Liou, Gregory I. / Potential roles of adenosine deaminase-2 in diabetic retinopathy. In: Biochemical and Biophysical Research Communications. 2013 ; Vol. 436, No. 3. pp. 355-361.
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