Hypoxia modulates adenosine receptors in human endothelial and smooth muscle cells toward an A2B angiogenic phenotype

Igor Feoktistov, Sergey Ryzhov, Hongyan Zhong, Anna E. Goldstein, Anton Matafonov, Dewan Zeng, Italo Biaggioni

Research output: Contribution to journalArticle

134 Citations (Scopus)

Abstract

We previously reported that adenosine A2B receptor activation stimulates angiogenesis. Because hypoxia is a potent stimulus for the release of both adenosine and angiogenic factors, we tested the hypothesis that hypoxia alters the expression of adenosine receptors toward an "angiogenic" phenotype. We used human umbilical vein endothelial cells (HUVECs) and bronchial smooth muscle cells (BSMCs) because, under normoxic conditions, adenosine does not release vascular endothelial growth factor (VEGF). HUVECs expressed a characteristic A2A phenotype (the selective A2A agonist CGS21680 was as potent as the nonselective agonist 5′-N- ethylcarboxamidoadenosine [NECA] in generating cAMP). Hypoxia (4.6% O 2, 3 hours) decreased A2A mRNA from 1.56±0.3% to 0.16±0.01% of β-actin expression but increased A2B mRNA from 0.08±0.01% to 0.27±0.05%. Consistent with changes in receptor expression, CGS21680 failed to increase cAMP in hypoxic HUVECs, whereas NECA remained active (A2B phenotype), and NECA increased VEGF release from 9.5±1.0 to 14.2±1.2 pg/mL (P<0.05), indicating that increased A2B receptors were functionally coupled to upregulation of VEGF. Hypoxia had similar effects on BSMCs, increasing A2B mRNA by 2.4±0.3-fold, from 0.42±0.04% to 1.00±0.13% of β-actin. Whereas NECA had no effect on VEGF release in normoxic BSMCs, it increased VEGF release in hypoxic BSMCs, from 74.6±9.6 to 188.3±16.7 pg/mL (P<0.01), and a selective A2B antagonist, CVT-6694, inhibited this increase. A2B receptors activated a VEGF reporter made unresponsive to hypoxia by mutating its hypoxia-inducible factor-1 (HIF-1) binding element, indicating a mechanism independent of HIF-1. In conclusion, hypoxia modulates the expression of adenosine receptors in human endothelial and smooth muscle cells toward an A2B "angiogenic" phenotype.

Original languageEnglish
Pages (from-to)649-654
Number of pages6
JournalHypertension
Volume44
Issue number5
DOIs
Publication statusPublished - Nov 2004
Externally publishedYes

Fingerprint

Purinergic P1 Receptors
Adenosine-5'-(N-ethylcarboxamide)
Vascular Endothelial Growth Factor A
Smooth Muscle Myocytes
Phenotype
Human Umbilical Vein Endothelial Cells
Hypoxia-Inducible Factor 1
Adenosine
Messenger RNA
Actins
Adenosine A2B Receptors
Angiogenesis Inducing Agents
Hypoxia
Up-Regulation

Keywords

  • Adenosine
  • Endothelium
  • Endothelium-derived factors
  • Hypoxia
  • Muscle, smooth
  • Receptors, purinergic
  • Vasculature

ASJC Scopus subject areas

  • Internal Medicine

Cite this

Feoktistov, I., Ryzhov, S., Zhong, H., Goldstein, A. E., Matafonov, A., Zeng, D., & Biaggioni, I. (2004). Hypoxia modulates adenosine receptors in human endothelial and smooth muscle cells toward an A2B angiogenic phenotype. Hypertension, 44(5), 649-654. https://doi.org/10.1161/01.HYP.0000144800.21037.a5

Hypoxia modulates adenosine receptors in human endothelial and smooth muscle cells toward an A2B angiogenic phenotype. / Feoktistov, Igor; Ryzhov, Sergey; Zhong, Hongyan; Goldstein, Anna E.; Matafonov, Anton; Zeng, Dewan; Biaggioni, Italo.

In: Hypertension, Vol. 44, No. 5, 11.2004, p. 649-654.

Research output: Contribution to journalArticle

Feoktistov, I, Ryzhov, S, Zhong, H, Goldstein, AE, Matafonov, A, Zeng, D & Biaggioni, I 2004, 'Hypoxia modulates adenosine receptors in human endothelial and smooth muscle cells toward an A2B angiogenic phenotype', Hypertension, vol. 44, no. 5, pp. 649-654. https://doi.org/10.1161/01.HYP.0000144800.21037.a5
Feoktistov, Igor ; Ryzhov, Sergey ; Zhong, Hongyan ; Goldstein, Anna E. ; Matafonov, Anton ; Zeng, Dewan ; Biaggioni, Italo. / Hypoxia modulates adenosine receptors in human endothelial and smooth muscle cells toward an A2B angiogenic phenotype. In: Hypertension. 2004 ; Vol. 44, No. 5. pp. 649-654.
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AU - Zeng, Dewan

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N2 - We previously reported that adenosine A2B receptor activation stimulates angiogenesis. Because hypoxia is a potent stimulus for the release of both adenosine and angiogenic factors, we tested the hypothesis that hypoxia alters the expression of adenosine receptors toward an "angiogenic" phenotype. We used human umbilical vein endothelial cells (HUVECs) and bronchial smooth muscle cells (BSMCs) because, under normoxic conditions, adenosine does not release vascular endothelial growth factor (VEGF). HUVECs expressed a characteristic A2A phenotype (the selective A2A agonist CGS21680 was as potent as the nonselective agonist 5′-N- ethylcarboxamidoadenosine [NECA] in generating cAMP). Hypoxia (4.6% O 2, 3 hours) decreased A2A mRNA from 1.56±0.3% to 0.16±0.01% of β-actin expression but increased A2B mRNA from 0.08±0.01% to 0.27±0.05%. Consistent with changes in receptor expression, CGS21680 failed to increase cAMP in hypoxic HUVECs, whereas NECA remained active (A2B phenotype), and NECA increased VEGF release from 9.5±1.0 to 14.2±1.2 pg/mL (P<0.05), indicating that increased A2B receptors were functionally coupled to upregulation of VEGF. Hypoxia had similar effects on BSMCs, increasing A2B mRNA by 2.4±0.3-fold, from 0.42±0.04% to 1.00±0.13% of β-actin. Whereas NECA had no effect on VEGF release in normoxic BSMCs, it increased VEGF release in hypoxic BSMCs, from 74.6±9.6 to 188.3±16.7 pg/mL (P<0.01), and a selective A2B antagonist, CVT-6694, inhibited this increase. A2B receptors activated a VEGF reporter made unresponsive to hypoxia by mutating its hypoxia-inducible factor-1 (HIF-1) binding element, indicating a mechanism independent of HIF-1. In conclusion, hypoxia modulates the expression of adenosine receptors in human endothelial and smooth muscle cells toward an A2B "angiogenic" phenotype.

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