dc.contributor.author |
Özdemir, Ramazan |
|
dc.contributor.author |
Parlakpınar, Hakan |
|
dc.contributor.author |
Polat, Alaadin |
|
dc.contributor.author |
Çolak, Cemil |
|
dc.contributor.author |
Ermiş, Necip |
|
dc.contributor.author |
Acet, Ahmet |
|
dc.date.accessioned |
2018-01-12T06:43:30Z |
|
dc.date.available |
2018-01-12T06:43:30Z |
|
dc.date.issued |
2006 |
|
dc.identifier.citation |
Özdemir, R., Parlakpınar, H., Polat, A., Çolak, C., Ermiş, N., & Acet, H. A. (2006). Selective Endothelin A Eta Receptor Antagonist Bq 123 Reduces Both Myocardial İnfarct Size And Oxidant İnjury. Toxicology, 219(1–3), 142–149. |
tr_TR |
dc.identifier.uri |
https://ac.els-cdn.com/S0300483X05005597/1-s2.0-S0300483X05005597-main.pdf?_tid=e00295a8-f762-11e7-9719-00000aacb35e&acdnat=1515739158_c1b917b4a7e91ee1c4f83f3d2556f729 |
|
dc.identifier.uri |
http://hdl.handle.net/11616/7978 |
|
dc.description |
Toxicology 219 (2006) 142–149. |
tr_TR |
dc.description.abstract |
Objective: Endothelins (ET) can be considered stress-responsive regulators working in paracrine and autocrine fashion. It has been
suggested that elevated levels of ET may be responsible for the low coronary re-flow phenomena. Ischemia–reperfusion (I/R) was
shown to stimulate ET release in rat heart; however, the mechanism(s) of this effect has not been clarified. Therefore, this study was
focused to investigate the effect of BQ-123, selective ETA receptor antagonist, on three aspects of myocardial ischemia–reperfusion
(MI/R) injury: hemodynamic parameters, infarct size and oxidant–antioxidant status in the absence and presence of ET-1 in an vivo
rat model.
Methods and results: To produce MI/R, a branch of the descending left coronary artery was occluded for 30 min followed by 2 h
reperfusion. ECG changes, blood pressure (BP), and heart rate (HR) were measured before occlusion and continued both occlusion
and reperfusion. Forty rats were randomly assigned to five groups equally: (1) sham-operated rats without coronary ligation, (2)
I/R group, (3) I/R + BQ-123-treated group (10 g/kg/min i.v.), (4) I/R + ET-treated group (25 ng/kg/min i.v.), (5) I/R + ET + BQ123-treated
group. The results are expressed as mean ± S.E.M. In the ET-1 plus I/R group, the ratio between the infarcted area
and area at risk 56 ± 1% was significantly higher than I/R group (49 ± 1%). In the BQ-123 group with or without exogenous ET-1
treatment in I/R group, this ratio was significantly lower at 40 ± 2 and 37 ± 1%, respectively. As compared to sham group, I/R
increased lipid peroxidation whereas decreased nitric oxide (NO), glutathione (GSH), catalase (CAT) and superoxide dismutase
(SOD) contents. This decreased antioxidant enzymatic defense could result in aggravated oxidative damage in I/R group rat hearts.
ET-1 administration group showed severe oxidative damage. BQ-123 administrations to I/R group with or without ET-1 caused
significantly decrease in lipid peroxidation and increased in SOD, CAT activities and NO generation and GSH content when
compared with I/R group alone.
Conclusions: The most important finding of the present study is that the ET blockade reduced I/R-induced myocardial injury.
The mechanism of this reduction was speculated to be a resistance to ischemic injury in the subcellular levels of the myocardium
conferred by a reduction of vascular constriction and improvement of imbalance in the antioxidant status.
© 2005 Elsevier Ireland Ltd. All rights reserved. |
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dc.language.iso |
eng |
tr_TR |
dc.publisher |
Toxicology |
tr_TR |
dc.rights |
info:eu-repo/semantics/openAccess |
tr_TR |
dc.subject |
ETA receptor antagonist (BQ-123) |
tr_TR |
dc.subject |
Endothelin |
tr_TR |
dc.subject |
Reactive oxygen radicals |
tr_TR |
dc.subject |
Rat |
tr_TR |
dc.title |
Selective endothelin a ETA receptor antagonist BQ 123 reduces both myocardial infarct size and oxidant injury |
tr_TR |
dc.type |
article |
tr_TR |
dc.relation.journal |
Toxicology |
tr_TR |
dc.contributor.department |
İnönü Üniversitesi |
tr_TR |
dc.contributor.authorID |
58684 |
tr_TR |
dc.contributor.authorID |
102000 |
tr_TR |
dc.contributor.authorID |
100549 |
tr_TR |
dc.contributor.authorID |
9712 |
tr_TR |
dc.contributor.authorID |
120232 |
tr_TR |
dc.identifier.volume |
129 |
tr_TR |
dc.identifier.issue |
(1-3) |
tr_TR |
dc.identifier.startpage |
142 |
tr_TR |
dc.identifier.endpage |
149 |
tr_TR |