Alterations of cardiac contractile function are related to changes in membrane calcium transport in spontaneously hypertensive rats.

Abstract:

OBJECTIVE:Transport activities of cardiac sodium-calcium exchange and sarcoplasmic reticulum calcium ATPase were measured biochemically in spontaneously hypertensive rats (SHR) with hypertrophied myocardium and in normotensive Wistar-Kyoto (WKY) rats and it was tested whether possible differences have consequences for the contractile properties of papillary muscle. METHODS:Sarcolemmal sodium-dependent calcium transport via sodium-calcium exchange and oxalate-supported sarcoplasmic reticulum calcium uptake were measured in left ventricular membranes of 22-week-old rats. Postextrastimulatory potentiated contractions, postrest potentiated contractions, the twitch-to-twitch decay of those potentiations and the response to increasing stimulation frequency of left ventricular papillary muscles were analysed. RESULTS:Compared with WKY rats we found in SHR: a significant increase in sodium-calcium exchange (65%) and in sarcoplasmic reticulum calcium uptake (24%); a steeper twitch-to-twitch decay in postextrastimulatory potentiated contractions and postrest potentiated contractions, suggesting a lower calcium fraction recirculating between myofilaments and sarcoplasmic reticulum and, consequently, a relatively higher calcium efflux via sodium-calcium exchange; a stronger rest-dependent decrease in recirculating calcium fraction in postrest potentiated contractions accompanied by accelerated relaxation, suggesting an increasing driving force for calcium extrusion via sodium-calcium exchange, probably caused by decreasing intracellular sodium during rest; a greater transient decrease in peak force of subsequent twitches after postrest potentiated contractions below pre-interventional level, indicating higher cellular calcium loss; and a smaller negative inotropic effect in response to doubling of stimulation rate as a manoeuvre to increase the intracellular sodium level. CONCLUSION:In SHR, the contractile properties suggest an increased contribution of sodium-calcium exchange to cellular calcium removal, which is strongly supported by the enhanced sodium-calcium exchange activity in cardiac membrane vesicles.

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

Lammerich A,Günther J,Pfitzer G,Storch E,Vetter R

doi

10.1097/00004872-199511000-00014

subject

Has Abstract

pub_date

1995-11-01 00:00:00

pages

1313-24

issue

11

eissn

0263-6352

issn

1473-5598

journal_volume

13

pub_type

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