Taurine 4: Taurine and Excitable Tissues - Couverture rigide

Livre 10 sur 544: Advances in Experimental Medicine and Biology
 
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Synopsis

Mitochondria from mammalian tissues possess an elaborate system for 2+ 2+ transporting Ca across their inner membrane which consists of Ca import, 2+ via the Ca uniporter, in response to the mitochondrial membrane 2+ + potential and of Ca release by an antiport system in exchange for H + 9,23 or Na (see Fig. l) . Because the uniporter is dependent upon the external 2+ 2+ 2+ 2+ Ca concentration ([Ca ]), mitochondria accumulate Ca until the [Ca ] o o 2+ decreases to the level at which the uniporter activity balances the Ca efflux. 2+ The [Ca ] at which the uniporter and efflux activities are equal is defined o the "setpoint" andcorresponds to values between 0.3-3µM. 2+ Figure 1. The Ca transport system of the inner membrane of mammalian mitochondria. U, + 2+ + + uniporter. I, Na -independent efflux mechanism or Ca /2H exchanger. D, Na -dependent 2+ + efflux mechanism or Ca /2Na exchanger. PTP, permeability transition pore. FP, 11 flavoprotein. membrane potential. ? pH gradient. Adapted from .

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Autres éditions populaires du même titre

9781475773422: Taurine 4: Taurine and Excitable Tissues

Edition présentée

ISBN 10 :  1475773420 ISBN 13 :  9781475773422
Editeur : Springer, 2013
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