[Na(+)] in the subsarcolemmal 'fuzzy' space and modulation of [Ca(2+)](i) and contraction in cardiac myocytes.

Abstract:

:The strength of the heart beat depends on the amplitude and time course of the transient increase in [Ca(2+)] in the myocytes with each cycle. [Na(+)](i) modulates cardiac contraction through its effect on the Ca(2+) flux through the Na/Ca exchanger. Cardiac excitation-contraction coupling has been postulated to occur in a microdomain or 'fuzzy' space at the junction of the T-tubules and the sarcoplasmic reticulum. This 'fuzzy' space is well described for the Ca(2+) fluxes and the interaction between the L-type Ca(2+) channel, the Ca(2+) release channel of the sarcoplasmic reticulum and the Na/Ca exchanger. Co-localization of the Na(+) transporters, in particular the Na/K pump and the Na(+) channel, within this 'fuzzy' space is not as well established. The functional and morphological characteristics of the 'fuzzy' space for Na(+) and its interaction with the Ca(2+) handling suggest that this space is not strictly co-inciding with the Ca(2+) microdomain. In this space [Na(+)] can be several-fold higher or lower than [Na(+)] in the bulk cytosol. This has implications for modulation of [Ca(2+)](i) during a single beat as well as during alterations in Na(+) fluxes seen in pathological conditions.

journal_name

Cell Calcium

journal_title

Cell calcium

authors

Verdonck F,Mubagwa K,Sipido KR

doi

10.1016/j.ceca.2004.01.014

keywords:

subject

Has Abstract

pub_date

2004-06-01 00:00:00

pages

603-12

issue

6

eissn

0143-4160

issn

1532-1991

pii

S0143416004000223

journal_volume

35

pub_type

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