Abstract:
:1. In the present study, we attempted to clarify whether the antidiabetic drug miglitol, an alpha-glucosidase inhibitor, has a protective effect against anginal ischaemia. We had reported previously that miglitol reduces myocardial infarct size through inhibition of glycogenolysis during ischaemia in rabbits. However, the effect of miglitol on anginal ischaemia remains unknown. 2. In open-chest beagle dogs with a severely stenosed left anterior descending coronary artery, an epicardial electrode was attached to the surface of the risk area of the left ventricle and a microdialysis probe was implanted into the myocardium to measure ST segment changes and interstitial lactate accumulation. The first episode of anginal ischaemia was induced by atrial pacing and phenylephrine infusion (50-100 microg/min) for 10 min. The second episode of anginal ischaemia was induced 210 min after the first episode. Miglitol (10 mg/kg, i.v.) was administered to the miglitol group (n = 10) 30 min before the second episode of anginal ischaemia, whereas saline was administered to the control group (n = 10). Regional myocardial blood flow was measured using coloured microspheres. 3. There was no significant difference in regional myocardial blood flow in the risk and non-risk areas between the first and second episodes of anginal ischaemia and between the miglitol and control groups. During the first and second episodes of anginal ischaemia, the ST segment was decreased to a similar extent in the control group. Although ST segment depression during the first episode of anginal ischaemia was similar in both groups, ST segment depression during the second episode of anginal ischaemia was significantly attenuated in the miglitol-treated group compared with the control group (1.3 +/- 0.4 vs 2.2 +/- 0.4 mV, respectively). Miglitol significantly attenuated myocardial interstitial lactate accumulation in the risk area. 4. In conclusion, in the present study miglitol improved ST segment depression and attenuated the accumulation of myocardial interstitial lactate during anginal ischaemia without altering regional myocardial blood flow. Miglitol has an anti-anginal ischaemia effect via a mechanism that is independent of regional myocardial blood flow.
journal_name
Clin Exp Pharmacol Physioljournal_title
Clinical and experimental pharmacology & physiologyauthors
Uno Y,Minatoguchi S,Arai M,Wang N,Chen XH,Hashimoto K,Lu C,Takemura G,Fujiwara Hdoi
10.1111/j.1440-1681.2005.04269.xkeywords:
subject
Has Abstractpub_date
2005-10-01 00:00:00pages
805-10issue
10eissn
0305-1870issn
1440-1681pii
CEP4269journal_volume
32pub_type
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