Augmented hyperaemia and reduced tissue injury in response to ischaemia in subjects with the 34C > T variant of the AMPD1 gene
Aims In patients with coronary artery disease, the 34C > T variant of the adenosine mono-phosphate deaminase gene (AMPD1), encoding a dysfunctional protein, predicts improved survival. We hypothesized that in subjects with this variant allele, ischaemia-induced intracellular adenosine formation i...
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Published in | European heart journal Vol. 28; no. 9; pp. 1085 - 1091 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Oxford
Oxford University Press
01.05.2007
Oxford Publishing Limited (England) |
Subjects | |
Online Access | Get full text |
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Abstract | Aims
In patients with coronary artery disease, the 34C > T variant of the adenosine mono-phosphate deaminase gene (AMPD1), encoding a dysfunctional protein, predicts improved survival. We hypothesized that in subjects with this variant allele, ischaemia-induced intracellular adenosine formation is increased, augmenting reactive hyperaemia and ischaemic tolerance.
Methods and results
We selected 10 healthy subjects with the CT genotype and 10 CC controls. The forearm vasodilator response to 2 and 5 min of ischaemia (venous occlusion plethysmography, expressed as percentage of maximum blood flow after 13 min of ischaemia) was higher in the CT group 56% (49-74%) and 77% (71-86%) vs. 49% (42-53%) and 60% (55-70%) in the CC group [median (interquartile range), P = 0.01]. Additionally, ischaemia-reperfusion injury was assessed in the thenar muscle using 99mTc-annexin A5 scintigraphy after forearm ischaemic exercise to detect externalized membrane phosphatidylserines. At reperfusion, 99mTc-annexin was administered intravenously. The change in annexin targeting between 1 and 4 h post-injection was −2.3% (interquartile range −2.4 to −1.6%) in the CT group vs. −0.3% (−0.6 to 1.3%) in controls (n = 7 in both groups, P = 0.03).
Conclusion
The 34C > T variant of AMPD1 augments vasodilation and reduces tissue injury in response to forearm ischaemia. These mechanisms could contribute to the survival benefit of cardiovascular patients with this variant allele. |
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AbstractList | Aims
In patients with coronary artery disease, the 34C > T variant of the adenosine mono-phosphate deaminase gene (AMPD1), encoding a dysfunctional protein, predicts improved survival. We hypothesized that in subjects with this variant allele, ischaemia-induced intracellular adenosine formation is increased, augmenting reactive hyperaemia and ischaemic tolerance.
Methods and results
We selected 10 healthy subjects with the CT genotype and 10 CC controls. The forearm vasodilator response to 2 and 5 min of ischaemia (venous occlusion plethysmography, expressed as percentage of maximum blood flow after 13 min of ischaemia) was higher in the CT group 56% (49-74%) and 77% (71-86%) vs. 49% (42-53%) and 60% (55-70%) in the CC group [median (interquartile range), P = 0.01]. Additionally, ischaemia-reperfusion injury was assessed in the thenar muscle using 99mTc-annexin A5 scintigraphy after forearm ischaemic exercise to detect externalized membrane phosphatidylserines. At reperfusion, 99mTc-annexin was administered intravenously. The change in annexin targeting between 1 and 4 h post-injection was −2.3% (interquartile range −2.4 to −1.6%) in the CT group vs. −0.3% (−0.6 to 1.3%) in controls (n = 7 in both groups, P = 0.03).
Conclusion
The 34C > T variant of AMPD1 augments vasodilation and reduces tissue injury in response to forearm ischaemia. These mechanisms could contribute to the survival benefit of cardiovascular patients with this variant allele. AIMSIn patients with coronary artery disease, the 34C > T variant of the adenosine mono-phosphate deaminase gene (AMPD1), encoding a dysfunctional protein, predicts improved survival. We hypothesized that in subjects with this variant allele, ischaemia-induced intracellular adenosine formation is increased, augmenting reactive hyperaemia and ischaemic tolerance.METHODS AND RESULTSWe selected 10 healthy subjects with the CT genotype and 10 CC controls. The forearm vasodilator response to 2 and 5 min of ischaemia (venous occlusion plethysmography, expressed as percentage of maximum blood flow after 13 min of ischaemia) was higher in the CT group 56% (49-74%) and 77% (71-86%) vs. 49% (42-53%) and 60% (55-70%) in the CC group [median (interquartile range), P = 0.01]. Additionally, ischaemia-reperfusion injury was assessed in the thenar muscle using (99m)Tc-annexin A5 scintigraphy after forearm ischaemic exercise to detect externalized membrane phosphatidylserines. At reperfusion, (99m)Tc-annexin was administered intravenously. The change in annexin targeting between 1 and 4 h post-injection was -2.3% (interquartile range -2.4 to -1.6%) in the CT group vs. -0.3% (-0.6 to 1.3%) in controls (n = 7 in both groups, P = 0.03).CONCLUSIONThe 34C > T variant of AMPD1 augments vasodilation and reduces tissue injury in response to forearm ischaemia. These mechanisms could contribute to the survival benefit of cardiovascular patients with this variant allele. In patients with coronary artery disease, the 34C > T variant of the adenosine mono-phosphate deaminase gene (AMPD1), encoding a dysfunctional protein, predicts improved survival. We hypothesized that in subjects with this variant allele, ischaemia-induced intracellular adenosine formation is increased, augmenting reactive hyperaemia and ischaemic tolerance. We selected 10 healthy subjects with the CT genotype and 10 CC controls. The forearm vasodilator response to 2 and 5 min of ischaemia (venous occlusion plethysmography, expressed as percentage of maximum blood flow after 13 min of ischaemia) was higher in the CT group 56% (49-74%) and 77% (71-86%) vs. 49% (42-53%) and 60% (55-70%) in the CC group [median (interquartile range), P = 0.01]. Additionally, ischaemia-reperfusion injury was assessed in the thenar muscle using (99m)Tc-annexin A5 scintigraphy after forearm ischaemic exercise to detect externalized membrane phosphatidylserines. At reperfusion, (99m)Tc-annexin was administered intravenously. The change in annexin targeting between 1 and 4 h post-injection was -2.3% (interquartile range -2.4 to -1.6%) in the CT group vs. -0.3% (-0.6 to 1.3%) in controls (n = 7 in both groups, P = 0.03). The 34C > T variant of AMPD1 augments vasodilation and reduces tissue injury in response to forearm ischaemia. These mechanisms could contribute to the survival benefit of cardiovascular patients with this variant allele. Aims In patients with coronary artery disease, the 34C > T variant of the adenosine mono-phosphate deaminase gene (AMPD1 ), encoding a dysfunctional protein, predicts improved survival. We hypothesized that in subjects with this variant allele, ischaemia-induced intracellular adenosine formation is increased, augmenting reactive hyperaemia and ischaemic tolerance. Methods and results We selected 10 healthy subjects with the CT genotype and 10 CC controls. The forearm vasodilator response to 2 and 5 min of ischaemia (venous occlusion plethysmography, expressed as percentage of maximum blood flow after 13 min of ischaemia) was higher in the CT group 56% (49-74%) and 77% (71-86%) vs. 49% (42-53%) and 60% (55-70%) in the CC group [median (interquartile range), P = 0.01]. Additionally, ischaemia-reperfusion injury was assessed in the thenar muscle using 99m Tc-annexin A5 scintigraphy after forearm ischaemic exercise to detect externalized membrane phosphatidylserines. At reperfusion, 99m Tc-annexin was administered intravenously. The change in annexin targeting between 1 and 4 h post-injection was -2.3% (interquartile range -2.4 to -1.6%) in the CT group vs. -0.3% (-0.6 to 1.3%) in controls (n = 7 in both groups, P = 0.03). Conclusion The 34C > T variant of AMPD1 augments vasodilation and reduces tissue injury in response to forearm ischaemia. These mechanisms could contribute to the survival benefit of cardiovascular patients with this variant allele. |
Author | Riksen, Niels P. Borm, George F. Smits, Paul Franke, Barbara Oyen, Wim J.G. Boerman, Otto C. Rongen, Gerard A. van den Broek, Petra |
Author_xml | – sequence: 1 givenname: Niels P. surname: Riksen fullname: Riksen, Niels P. email: n.riksen@aig.umcn.nl organization: 1 Department of Pharmacology-Toxicology, Radboud University Nijmegen Medical Centre, Geert Grooteplein 21, 6525 EZ, PO Box 9101, 6500 HB Nijmegen, The Netherlands – sequence: 2 givenname: Barbara surname: Franke fullname: Franke, Barbara organization: 3 Department of Human Genetics, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands – sequence: 3 givenname: Wim J.G. surname: Oyen fullname: Oyen, Wim J.G. organization: 4 Department of Nuclear Medicine, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands – sequence: 4 givenname: George F. surname: Borm fullname: Borm, George F. organization: 5 Department of Epidemiology and Biostatistics, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands – sequence: 5 givenname: Petra surname: van den Broek fullname: van den Broek, Petra organization: 1 Department of Pharmacology-Toxicology, Radboud University Nijmegen Medical Centre, Geert Grooteplein 21, 6525 EZ, PO Box 9101, 6500 HB Nijmegen, The Netherlands – sequence: 6 givenname: Otto C. surname: Boerman fullname: Boerman, Otto C. organization: 4 Department of Nuclear Medicine, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands – sequence: 7 givenname: Paul surname: Smits fullname: Smits, Paul organization: 1 Department of Pharmacology-Toxicology, Radboud University Nijmegen Medical Centre, Geert Grooteplein 21, 6525 EZ, PO Box 9101, 6500 HB Nijmegen, The Netherlands – sequence: 8 givenname: Gerard A. surname: Rongen fullname: Rongen, Gerard A. organization: 1 Department of Pharmacology-Toxicology, Radboud University Nijmegen Medical Centre, Geert Grooteplein 21, 6525 EZ, PO Box 9101, 6500 HB Nijmegen, The Netherlands |
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Copyright | The European Society of Cardiology 2007. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org 2007 2007 INIST-CNRS The European Society of Cardiology 2007. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org |
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Keywords | Ischaemia Adenosine Scintigraphy genotype Blood flow Radionuclide study Human Typing Injury AMPD1 genotype Cardiovascular disease Genotype Phlebology Trauma Response Variant Tissue Microbiological investigation Gene Ischemia Medical imagery Genetics Circulatory system Lesion Cardiology |
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In patients with coronary artery disease, the 34C > T variant of the adenosine mono-phosphate deaminase gene (AMPD1), encoding a dysfunctional protein,... In patients with coronary artery disease, the 34C > T variant of the adenosine mono-phosphate deaminase gene (AMPD1), encoding a dysfunctional protein,... Aims In patients with coronary artery disease, the 34C > T variant of the adenosine mono-phosphate deaminase gene (AMPD1 ), encoding a dysfunctional protein,... AIMSIn patients with coronary artery disease, the 34C > T variant of the adenosine mono-phosphate deaminase gene (AMPD1), encoding a dysfunctional protein,... |
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SubjectTerms | Adult AMP Deaminase - genetics Biological and medical sciences Cardiology. Vascular system Dipyridamole - pharmacology Female Forearm - blood supply Humans Hyperemia - genetics Ligation Male Medical sciences Reperfusion Injury - genetics Vasodilator Agents - pharmacology |
Title | Augmented hyperaemia and reduced tissue injury in response to ischaemia in subjects with the 34C > T variant of the AMPD1 gene |
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