کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10758881 | 1050413 | 2013 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Delayed pharyngeal repolarization promotes abnormal calcium buildup in aging muscle
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
In the pharynx of Caenorhabditis elegans, the accessory subunit MPS-4, homolog to human KCNE1, forms a complex with K+ channel EXP-2 that terminates the action potential. An aspartate residue critical for KCNE1 function, asp76, is conserved in MPS-4 (asp74). Here, we studied the effects of D74N-MPS-4 on the aging pharynx. Electrophysiological studies showed that D74N delays pharyngeal repolarization. Pharynxes of transgenic worms expressing D74N exhibited higher levels of intracellular calcium compared to normal pharynxes. Accordingly, loss of pharyngeal function was accelerated in aging D74N worms. The pharyngeal action potential resembles the action potential that controls the mechanical activity of human left ventricle. Hence, these findings argue that the hearts of patients affected by delayed repolarization, a condition known as long QT syndrome, may experience dysregulated calcium homeostasis.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochemical and Biophysical Research Communications - Volume 433, Issue 3, 12 April 2013, Pages 354-357
Journal: Biochemical and Biophysical Research Communications - Volume 433, Issue 3, 12 April 2013, Pages 354-357
نویسندگان
Przemyslaw Swiatkowski, Federico Sesti,