Igniting Ca2+ sparks with TRPML1
نویسندگان
چکیده
منابع مشابه
Perspectives on Ca2+ Sparks
The purpose of the Perspectives in General Physiology is to provide a forum where scientific uncertainties or controversies can be discussed in an authoritative, yet open manner. The Perspectives are solicited by the editors—often based on recommendations by the advisory editors or members of the editorial board, who may be asked to coordinate the process. To frame the issue, two or more expert...
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Punctate releases of Ca2+, called Ca2+ sparks, originate at the regular array of t-tubules in cardiac myocytes and skeletal muscle. During Ca2+ overload sparks serve as sites for the initiation and propagation of Ca2+ waves in myocytes. Computer simulations of spark-mediated waves are performed with model release sites that reproduce the adaptive Ca2+ release observed for the ryanodine receptor...
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Electrical excitation of the mammalian heart originates from specialized pacemaker cells in the right atrium. Pacemaker activity depends on multiple ion channels and transport mechanisms that reside primarily within the plasma membrane. However, recent evidence indicates that intracellular Ca2+ release from the sarcoplasmic reticulum also contributes importantly to atrial pacemaker function.
متن کاملLarge currents generate cardiac Ca2+ sparks.
Previous models of cardiac Ca2+ sparks have assumed that Ca2+ currents through the Ca2+ release units (CRUs) were approximately 1-2 pA, producing sparks with peak fluorescence ratio (F/F(0)) of approximately 2.0 and a full-width at half maximum (FWHM) of approximately 1 microm. Here, we present actual Ca2+ sparks with peak F/F(0) of >6 and a FWHM of approximately 2 microm, and a mathematical mo...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 2020
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.2022896117