Protective effect of adenosine receptors against lipopolysaccharide-induced acute lung injury

Joyce N Gonzales, Boris A Gorshkov, Matthew N. Varn, Marina A. Zemskova, Evgeny Alexandrovich Zemskov, Supriya Sridhar, Rudolf Lucas, Alexander Dmitriyevich Verin

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Acute lung injury and acute respiratory distress syndrome (ALI/ARDS) affect 200,000 people a year in the USA. Pulmonary vascular and specifically endothelial cell (EC) barrier compromise is a hallmark of these diseases. We have recently shown that extracellular adenosine enhances human pulmonary (EC) barrier via activation of adenosine receptors (ARs) in cell cultures. On the basis of these data, we hypothesized that activation of ARs might exert barrier-protective effects in a model of ALI/ARDS in mice. To test this hypothesis, we examined the effects of pre- and posttreatment of adenosine and 5′-N-ethylcarboxamidoadenosine (NECA), a nonselective stable AR agonist, on LPS-induced lung injury. Mice were given vehicle or LPS intratracheally followed by adenosine, NECA, or vehicle instilled via the internal jugular vein. Postexperiment cell counts, Evans Blue Dye albumin (EBDA) extravasation, levels of proteins, and inflammatory cytokines were analyzed. Harvested lungs were used for histology and myeloperoxidase studies. Mice challenged with LPS alone demonstrated an inflammatory response typical of ALI. Cell counts, EBDA extravasation, as well as levels of proteins and inflammatory cytokines were decreased in adenosine-treated mice. Histology displayed reduced infiltration of neutrophils. NECA had a similar effect on LPS-induced vascular barrier compromise. Importantly, posttreatment with adenosine or NECA recovers lung vascular barrier and reduces inflammation induced by LPS challenge. Furthermore, adenosine significantly attenuated protein degradation of A2A and A3 receptors induced by LPS. Collectively, our results demonstrate that activation of ARs protects and restores vascular barrier functions and reduces inflammation in LPS-induced ALI.

Original languageEnglish (US)
Pages (from-to)L497-L507
JournalAmerican Journal of Physiology - Lung Cellular and Molecular Physiology
Volume306
Issue number6
DOIs
StatePublished - Mar 15 2014

Fingerprint

Purinergic P1 Receptors
Acute Lung Injury
Adenosine-5'-(N-ethylcarboxamide)
Adenosine
Lipopolysaccharides
Blood Vessels
Lung
Evans Blue
Adult Respiratory Distress Syndrome
Albumins
Histology
Coloring Agents
Endothelial Cells
Cell Count
Purinergic P1 Receptor Agonists
CD14 Antigens
Cytokines
Inflammation
Neutrophil Infiltration
Jugular Veins

Keywords

  • Acute lung injury
  • Adenosine
  • Lipopolysaccharide
  • Pulmonary edema
  • Receptors

ASJC Scopus subject areas

  • Physiology
  • Pulmonary and Respiratory Medicine
  • Physiology (medical)
  • Cell Biology

Cite this

Protective effect of adenosine receptors against lipopolysaccharide-induced acute lung injury. / Gonzales, Joyce N; Gorshkov, Boris A; Varn, Matthew N.; Zemskova, Marina A.; Zemskov, Evgeny Alexandrovich; Sridhar, Supriya; Lucas, Rudolf; Verin, Alexander Dmitriyevich.

In: American Journal of Physiology - Lung Cellular and Molecular Physiology, Vol. 306, No. 6, 15.03.2014, p. L497-L507.

Research output: Contribution to journalArticle

Gonzales, Joyce N ; Gorshkov, Boris A ; Varn, Matthew N. ; Zemskova, Marina A. ; Zemskov, Evgeny Alexandrovich ; Sridhar, Supriya ; Lucas, Rudolf ; Verin, Alexander Dmitriyevich. / Protective effect of adenosine receptors against lipopolysaccharide-induced acute lung injury. In: American Journal of Physiology - Lung Cellular and Molecular Physiology. 2014 ; Vol. 306, No. 6. pp. L497-L507.
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AB - Acute lung injury and acute respiratory distress syndrome (ALI/ARDS) affect 200,000 people a year in the USA. Pulmonary vascular and specifically endothelial cell (EC) barrier compromise is a hallmark of these diseases. We have recently shown that extracellular adenosine enhances human pulmonary (EC) barrier via activation of adenosine receptors (ARs) in cell cultures. On the basis of these data, we hypothesized that activation of ARs might exert barrier-protective effects in a model of ALI/ARDS in mice. To test this hypothesis, we examined the effects of pre- and posttreatment of adenosine and 5′-N-ethylcarboxamidoadenosine (NECA), a nonselective stable AR agonist, on LPS-induced lung injury. Mice were given vehicle or LPS intratracheally followed by adenosine, NECA, or vehicle instilled via the internal jugular vein. Postexperiment cell counts, Evans Blue Dye albumin (EBDA) extravasation, levels of proteins, and inflammatory cytokines were analyzed. Harvested lungs were used for histology and myeloperoxidase studies. Mice challenged with LPS alone demonstrated an inflammatory response typical of ALI. Cell counts, EBDA extravasation, as well as levels of proteins and inflammatory cytokines were decreased in adenosine-treated mice. Histology displayed reduced infiltration of neutrophils. NECA had a similar effect on LPS-induced vascular barrier compromise. Importantly, posttreatment with adenosine or NECA recovers lung vascular barrier and reduces inflammation induced by LPS challenge. Furthermore, adenosine significantly attenuated protein degradation of A2A and A3 receptors induced by LPS. Collectively, our results demonstrate that activation of ARs protects and restores vascular barrier functions and reduces inflammation in LPS-induced ALI.

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