The DOI matches its Crossref record; 42 of the 42 references it cites were found in a registry or an index.
Enhanced Sarcoplasmic Reticulum Ca 2+ Leak and Increased Na + -Ca 2+ Exchanger Function Underlie Delayed Afterdepolarizations in Patients With Chronic Atrial Fibrillation
Open accessAbstract
Background—: Delayed afterdepolarizations (DADs) carried by Na + -Ca 2+ -exchange current (I NCX ) in response to sarcoplasmic reticulum (SR) Ca 2+ leak can promote atrial fibrillation (AF). The mechanisms leading to delayed afterdepolarizations in AF patients have not been defined. Methods and Results—: Protein levels (Western blot), membrane currents and action potentials (patch clamp), and [Ca 2+ ] i (Fluo-3) were measured in right atrial samples from 76 sinus rhythm (control) and 72 chronic AF (cAF) patients. Diastolic [Ca 2+ ] i and SR Ca 2+ content (integrated I NCX during caffeine-induced Ca 2+ transient) were unchanged, whereas diastolic SR Ca 2+ leak, estimated by blocking ryanodine receptors (RyR2) with tetracaine, was ≈50% higher in cAF versus control. Single-channel recordings from atrial RyR2 reconstituted into lipid bilayers revealed enhanced open probability in cAF samples, providing a molecular basis for increased SR Ca 2+ leak. Calmodulin expression (60%), Ca 2+ /calmodulin-dependent protein kinase-II (CaMKII) autophosphorylation at Thr287 (87%), and RyR2 phosphorylation at Ser2808 (protein kinase A/CaMKII site, 236%) and Ser2814 (CaMKII site, 77%) were increased in cAF. The selective CaMKII blocker KN-93 decreased SR Ca 2+ leak, the frequency of spontaneous Ca 2+ release events, and RyR2 open probability in cAF, whereas protein kinase A inhibition with H-89 was ineffective. Knock-in mice with constitutively phosphorylated RyR2 at Ser2814 showed a higher incidence of Ca 2+ sparks and increased susceptibility to pacing-induced AF compared with controls. The relationship between [Ca 2+ ] i and I NCX density revealed I NCX upregulation in cAF. Spontaneous Ca 2+ release events accompanied by inward I NCX currents and delayed afterdepolarizations/triggered activity occurred more often and the sensitivity of resting membrane voltage to elevated [Ca 2+ ] i (diastolic [Ca 2+ ] i –voltage coupling gain) was higher in cAF compared with control. Conclusions—: Enhanced SR Ca 2+ leak through CaMKII-hyperphosphorylated RyR2, in combination with larger I NCX for a given SR Ca 2+ release and increased diastolic [Ca 2+ ] i -voltage coupling gain, causes AF-promoting atrial delayed afterdepolarizations/triggered activity in cAF patients.
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Cites
Cardiac excitation–contraction coupling
Bers, D. M. (2002) · Nature · doi:10.1038/415198a · Cited by 4,744
PKA Phosphorylation Dissociates FKBP12.6 from the Calcium Release Channel (Ryanodine Receptor)
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Self-citationAtrial L-Type Ca 2+ Currents and Human Atrial Fibrillation
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Outward K + Current Densities and Kv1.5 Expression Are Reduced in Chronic Human Atrial Fibrillation
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2016 ESC Guidelines for the management of atrial fibrillation developed in collaboration with EACTS
Kirchhof, P., Benussi, S., Kotecha, D., Ahlsson, A., Atar, D., Casadei, B., Castella, M., Diener, H.-C., Heidbuchel, H., Hendriks, J., et al. (2016) · European Heart Journal · doi:10.1093/eurheartj/ehw210 · Cited by 6,418
Self-citation2014 AHA/ACC/HRS Guideline for the Management of Patients With Atrial Fibrillation
January, C. T., Wann, L. S., Alpert, J. S., Calkins, H., Cigarroa, J. E., Cleveland, J. C., Conti, J. B., Ellinor, P. T., Ezekowitz, M. D., Field, M. E., et al. (2014) · Journal of the American College of Cardiology · doi:10.1016/j.jacc.2014.03.022 · Cited by 2,955
Joglar, J. A., Chung, M. K., Armbruster, A. L., Benjamin, E. J., Chyou, J. Y., Cronin, E. M., Deswal, A., Eckhardt, L. L., Goldberger, Z. D., Gopinathannair, R., et al. (2024) · Circulation · doi:10.1161/cir.0000000000001193 · Cited by 2,765
Calkins, H., Hindricks, G., Cappato, R., Kim, Y.-H., Saad, E. B., Aguinaga, L., Akar, J. G., Badhwar, V., Brugada, J., Camm, J., et al. (2017) · Heart Rhythm · doi:10.1016/j.hrthm.2017.05.012 · Cited by 2,755
Self-citation2016 ESC Guidelines for the management of atrial fibrillation developed in collaboration with EACTS
Kirchhof, P., Benussi, S., Kotecha, D., Ahlsson, A., Atar, D., Casadei, B., Castella, M., Diener, H.-C., Heidbuchel, H., Hendriks, J., et al. (2016) · European Journal of Cardio-Thoracic Surgery · doi:10.1093/ejcts/ezw313 · Cited by 1,403
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Metadata
- Authors
- Voigt, N., Li, N., Wang, Q., Wang, W., Trafford, A. W., Abu-Taha, I., Sun, Q., Wieland, T., Ravens, U., Nattel, S., Wehrens, X. H. T., & Dobrev, D.
- Venue
- Circulation
- Published
- 2012-05
- Volume
- 125
- Issue
- 17
- Pages
- 2059-2070
- ISSN
- 0009-7322 (ISSN-L)
- 1524-4539
- OpenAlex
- W2051822015
- Cited by
- 624
- References
- 42
- FWCI
- 32.23
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Voigt, N., Li, N., Wang, Q., Wang, W., Trafford, A. W., Abu-Taha, I., Sun, Q., Wieland, T., Ravens, U., Nattel, S., Wehrens, X. H. T., & Dobrev, D. (2012). Enhanced Sarcoplasmic Reticulum Ca 2+ Leak and Increased Na + -Ca 2+ Exchanger Function Underlie Delayed Afterdepolarizations in Patients With Chronic Atrial Fibrillation. Circulation. https://doi.org/10.1161/circulationaha.111.067306
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