Modeling effects of L-type Ca2+ current and Na+-Ca2+ exchanger on Ca2+ trigger flux in rabbit myocytes with realistic t-tubule geometries

Frontiers in Physiology

Yuhui eCheng¹  Johan E Hake²  Michael J Holst³  J Andrew eMcCammon³  Andrew D McCulloch³  Anushka Plamenova Michailova³  Peter M Kekenes-Huskey³  John H Bridge⁴  Frank B Sachse⁴ 

[1] Florida State University;Simula Research Laboratory;University of California San Diego;University of Utah;

关键词: Allosteric Regulation;    Ca2+ signaling;    channel clustering;    L-type Ca2+ channel;    Na+/Ca2+ exchanger;    rabbit ventricular myocyte;   

DOI  :  10.3389/fphys.2012.00351

来源: DOAJ

【 摘 要 】

The transverse tubular system of rabbit ventricular myocytes consists of cell membrane invaginations (t-tubules) that are essential for efficient cardiac excitation-contraction coupling. In this study, we investigate how t-tubule micro-anatomy, L-type Ca2+ channel clustering and allosteric activation of Na+/Ca2+ exchanger by L-type Ca2+ current affects intracellular Ca2+ dynamics. Our model includes a realistic 3D geometry of a single t-tubule and its surrounding half-sarcomeres for rabbit ventricular myocytes. The effects of spatially-distributed membrane ion-transporters (L-type Ca2+ channel, Na+/Ca2+ exchanger, sarcolemmal Ca2+ pump, sarcolemmal Ca2+ leak), and stationary and mobile Ca2+ buffers (troponin C, ATP, calmodulin, and Fluo-3) are also considered. We used a coupled reaction-diffusion system to describe the spatio-temporal concentration profiles of free and buffered intracellular Ca2+. We obtained parameters from voltage-clamp protocols of L-type Ca2+ current and line-scan recordings of Ca2+ concentration profiles in rabbit cells, in which the sarcoplasmic reticulum is disabled. Our model results agree with experimental measurements of global Ca2+ transient in myocytes loaded with 50 µM Fluo-3. We found that local Ca2+ concentrations within the cytosol and sub-sarcolemma, as well as the local trigger fluxes of Ca2+ crossing the cell membrane, are sensitive to details of t-tubule micro-structure and membrane Ca2+ flux distribution. The model additionally predicts that local Ca2+ trigger fluxes are at least 3-fold to 8-fold higher than the whole-cell Ca2+ trigger flux. We found also that the activation of allosteric Ca2+-binding sites on the Na+/Ca2+ exchanger could provide a mechanism for regulating global and local Ca2+ trigger fluxes in vivo. Our studies indicate that improved structural and functional models could improve our understanding of the contributions of L-type and Na+/Ca2+ exchanger fluxes to intracellular Ca2+ dynamics.

【 授权许可】

Unknown