National Institutes of Health

Oxford University

Fig. 2. Effect of cell orientation on geometry of microstreams.

Figure 11. Models of intrinsic H+i mobility

Physiology Department

The Wellcome Trust

British Heart Foundation

 

PROTON  TRANSPORT  GROUP
Intracellular pH regulation in heart

 

Group Leader Prof.
Richard Vaughan-Jones

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RESEARCH  INTERESTS

Regulation of Intracellular pH in heart


The ion transporters involved

Our laboratory was the first to identify functionally three of the principal transporters involved in pHi regulation, the Cl-HCO3- exchanger (Anion Exchanger, AE), the Na-HCO3 cotransporter (NBC) and a Cl-OH exchanger (CHE). All except CHE have now been cloned although the precise NBC and AE isoforms that contribute functionally to pHi control in the heart have yet to be determined. The basic kinetic characteristics of the four principal transporters, NHE, AE, NBC & CHE have been mapped out, particularly their dependence on intracellular and extracellular pH levels.  When inserted into a computational model these pH dependencies accurately predict the time course of response of whole cell pHi to acute intracellular or extracellular acid/base loads.   

 

Acid-equivalent transporters in the cardiac myocyte 

 

To read more about our research please click on the titles below:

 

Importance of pHi

Techniques

 The ion transporters involved

Local intracellular control of pHi

 

Local junctional control of pHi

Molecular basis of pH sensing by acid/base transporters

Influence of pHi on Ca2+i