کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8299111 | 1537052 | 2008 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A novel potassium channel in skeletal muscle mitochondria
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موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this work we provide evidence for the potential presence of a potassium channel in skeletal muscle mitochondria. In isolated rat skeletal muscle mitochondria, Ca2+ was able to depolarize the mitochondrial inner membrane and stimulate respiration in a strictly potassium-dependent manner. These potassium-specific effects of Ca2+ were completely abolished by 200Â nM charybdotoxin or 50Â nM iberiotoxin, which are well-known inhibitors of large conductance, calcium-activated potassium channels (BKCa channel). Furthermore, NS1619, a BKCa-channel opener, mimicked the potassium-specific effects of calcium on respiration and mitochondrial membrane potential. In agreement with these functional data, light and electron microscopy, planar lipid bilayer reconstruction and immunological studies identified the BKCa channel to be preferentially located in the inner mitochondrial membrane of rat skeletal muscle fibers. We propose that activation of mitochondrial K+ transport by opening of the BKCa channel may be important for myoprotection since the channel opener NS1619 protected the myoblast cell line C2C12 against oxidative injury.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimica et Biophysica Acta (BBA) - Bioenergetics - Volume 1777, Issues 7â8, JulyâAugust 2008, Pages 651-659
Journal: Biochimica et Biophysica Acta (BBA) - Bioenergetics - Volume 1777, Issues 7â8, JulyâAugust 2008, Pages 651-659
نویسندگان
Jolanta Skalska, Marta PiwoÅska, Elzbieta Wyroba, Liliana Surmacz, Rafal Wieczorek, Izabela Koszela-Piotrowska, Joanna ZieliÅska, Piotr Bednarczyk, Krzysztof DoÅowy, Grzegorz M. Wilczynski, Adam Szewczyk, Wolfram S. Kunz,