Altered stress stimulation of inward rectifier potassium channels in Andersen‐Tawil syndrome
Altered stress stimulation of inward rectifier potassium channels in Andersen‐Tawil syndrome
复制标题
AndersenâTawil 综合征中内向整流钾通道的应激刺激发生改变
DOI:
10.1096/fj.11-189126
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发表时间:
2012
期刊:
影响因子:
--
通讯作者:
Tavare
中科院分区:
文献类型:
--
作者:
Seebohm;Strutz-Seebohm;Preisig-Müller;Zuzarte;Kienitz;Bendahhou;Fauler;Tapken;Decher;Collins;Jurkat-Rott;Steinmeyer;Lehmann-Horn;Tavare
Inward rectifier potassium channels of the Kir2 subfamily are important determinants of the electrical activity of brain and muscle cells. Genetic mutations in Kir2.1 associate with Andersen‐Tawil syndrome (ATS), a familial disorder leading to stress‐triggered periodic paralysis and ventricular arrhythmia. To identify the molecular mechanisms of this stress trigger, we analyze Kir channel function and localization electrophysiologically and by time‐resolved confocal microscopy. Furthermore, we employ a mathematical model of muscular membrane potential. We identify a novel corticoid signaling pathway that, when activated by glucocorticoids, leads to enrichment of Kir2 channels in the plasma membranes of mammalian cell lines and isolated cardiac and skeletal muscle cells. We further demonstrate that activation of this pathway can either partly restore (40% of cases) or further impair (20% of cases) the function of mutant ATS channels, depending on the particular Kir2.1 mutation. This means that glucocorticoid treatment might either alleviate or deteriorate symptoms of ATS depending on the patient's individual Kir2.1 genotype. Thus, our findings provide a possible explanation for the contradictory effects of glucocorticoid treatment on symptoms in patients with ATS and may open new pathways for the design of personalized medicines in ATS therapy.—Seebohm, G., Strutz‐Seebohm, N., Ursu, O. N., Preisig‐Müller, R., Zuzarte, M., Hill, E. V., Kienitz, M.‐C., Bendahhou, S., Fauler, M., Tapken, D., Decher, N., Collins, A., Jurkat‐Rott, K., Steinmeyer, K., Lehmann‐Horn, F., Daut, J., Tavaré, J. M., Pott, L., Bloch,W., Lang, F. Altered stress stimulation of inward rectifier potassium channels in Andersen‐Tawil syndrome.FASEB J.26, 513–522 (2012). www.fasebj.org
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DOI:
10.1152/ajpheart.00701.2006
发表时间:
2007
期刊:
American journal of physiology. Heart and circulatory physiology
影响因子:
--
作者:
G. Seemann;F. Sachse;D. Weiß;L. Ptáček;M. Tristani
通讯作者:
M. Tristani
DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
R. Vicente;M. Coma;S. Busquets;R. Moore;F. López‐Soriano;J. M. Argiles;A. Felipe
通讯作者:
A. Felipe
影响因子:
3.6
作者:
A. Collins;Haoran Wang;Maureen Larson
通讯作者:
Maureen Larson
影响因子:
4
作者:
Berwick, DC;Dell, GC;Tavaré, JM
通讯作者:
Tavaré, JM
DOI:
10.1073/pnas.0604816103
发表时间:
2006-07-25
影响因子:
11.1
作者:
Arteaga, Maria Francisca;Wang, Lin;Canessa, Cecilia M.
通讯作者:
Canessa, Cecilia M.