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Measurement of Ca2+ pump-mediated efflux in hypertension
G R Monteith1, S Chen, B D Roufogalis
1Department of Pharmacy, University of Sydney, N.S.W., Australia.
Insights
Hypertension research shows increased calcium (Ca2+) influx but unclear efflux. This review examines Ca2+ efflux in hypertension, focusing on vascular smooth muscle and the spontaneously hypertensive rat model.
Area of Science:
- Cardiovascular Research
- Cell Physiology
Background:
- Calcium (Ca2+) homeostasis is crucial in hypertension research.
- Hypertension in spontaneously hypertensive rats involves enhanced Ca2+ influx.
- The role of Ca2+ efflux in hypertension remains controversial.
Purpose of the Study:
- To review findings on Ca2+ efflux in hypertension.
- To discuss techniques for assessing Ca2+ efflux.
- To evaluate the spontaneously hypertensive rat as a model for essential hypertension.
Main Methods:
- Literature review of Ca2+ homeostasis in hypertension.
- Analysis of studies on Ca2+ influx and efflux.
- Focus on vascular smooth muscle and the spontaneously hypertensive rat model.
Main Results:
- Enhanced Ca2+ influx is evident in hypertension models.
- Conflicting data exists regarding Ca2+ efflux in hypertension.
- Ca2+ efflux mechanisms require further investigation.
Conclusions:
- Clarifying Ca2+ efflux is vital for understanding hypertension.
- Improved techniques are needed to resolve inconsistencies in Ca2+ efflux data.
- The spontaneously hypertensive rat is a relevant model for studying essential hypertension mechanisms.
Abstract:
Ca2+ homeostasis has been a prominent research area in the study of hypertension. There is convincing evidence that hypertension in spontaneously hypertensive rats is characterized by enhanced Ca2+ influx in various cell types. It is, however, still unclear whether hypertension is associated with reduced or enhanced Ca2+ efflux. Reduced Ca2+ efflux would augment the effects of enhanced Ca2+ influx. However, enhanced Ca2+ extrusion may occur as an adaptive process to minimize the effects of Ca2+ overload. This question remains unanswered because of inconsistent results obtained using a variety of experimental techniques. In this article we have reviewed the research findings and discuss existing and possible new techniques to assess Ca2+ efflux in hypertension, with particular attention to vascular smooth muscle. We have focused mainly on studies using the spontaneously hypertensive rat and discuss its appropriateness as a model for essential hypertension.