کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10818978 | 1060290 | 2013 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Pharmacological characterization of the heartbeat in an extant vertebrate ancestor, the Pacific hagfish, Eptatretus stoutii
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
ZatebradineICAHCNTTXS.E.MINa - INA°C - ° Catrioventricular block - بلوک اتریواستاتیکbpm - بوقلمونtetrodotoxin - تترو دوتوکسین analysis of variance - تحلیل واریانسANOVA - تحلیل واریانس Analysis of variancesodium current - جریان سدیمcalcium current - جریان کلسیمstandard error of the mean - خطای استاندارد میانگینdegrees Celsius - درجه سیلسیوسRyanodine - رایانودینbeats per minute - ضربان در دقیقهCardiac pacemaker - ضربان ساز قلبHeart - قلب Fish - ماهیVoltage-gated - ولتاژ خاموشhyperpolarization-activated cyclic nucleotide-gated channel - کانال نوکلئوتیدی غربالگری فعال cyclic hyperpolarization فعال استIon-channels - یون کانال
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Pharmacological characterization of the heartbeat in an extant vertebrate ancestor, the Pacific hagfish, Eptatretus stoutii Pharmacological characterization of the heartbeat in an extant vertebrate ancestor, the Pacific hagfish, Eptatretus stoutii](/preview/png/10818978.png)
چکیده انگلیسی
Pharmacological ion-channel blockers were used to investigate the spontaneous heart rates in Pacific hagfish, Eptatretus stoutii. Zatebradine, a hyperpolarization-activated cyclic nucleotide-gated (HCN) channel blocker, vastly reduced atrial and ventricular contraction rates in a similar concentration-dependent manner, indicating a major role for HCN in setting intrinsic heart rate. When voltage-gated Na+ channels were blocked with tetrodotoxin (TTX), atrial contraction rate declined in a dose-dependent manner, but remained faster than ventricular rate even at very high TTX concentrations. This TTX resistance compared with other fish suggests an important role for a TTX-sensitive inactivation-resistant Na+ current in atrioventricular conduction and chamber synchrony, and a lesser role in setting intrinsic heart rate. T and L-type calcium channel blockers, nickel and nifedipine respectively, also reduced atrial and ventricular contraction rates, nickel having a larger effect on the atrium. These novel results for hagfish are consistent with intrinsic atrial and ventricular rates being set mostly by HCN, with lesser contributions from other ion channels. We suggest that future electrophysiological studies will reveal that hagfishes, with their ancestral position in the evolution of the vertebrate-type chambered heart, share some but not all features of vertebrate intrinsic heart rate control.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology - Volume 164, Issue 1, January 2013, Pages 258-263
Journal: Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology - Volume 164, Issue 1, January 2013, Pages 258-263
نویسندگان
Christopher M. Wilson, Anthony P. Farrell,