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Smooth muscle intracellular pH: measurement, regulation, and function.
1Physiology Department, University College London United Kingdom.
The American Journal of Physiology
|February 1, 1988
Summary
Intracellular pH (pHi) in smooth muscle is approximately 7.06, similar to other muscle types. Smooth muscle regulates its pHi, and changes in pHi significantly impact muscle contraction, sometimes increasing force during acidification.
Area of Science:
- Physiology
- Biochemistry
Background:
- Smooth muscle is vital for bodily functions.
- The role of intracellular pH (pHi) and its regulation in smooth muscle was previously unclear.
- pH changes are known to influence smooth muscle activity.
Purpose of the Study:
- To investigate intracellular pH (pHi) values in smooth muscle.
- To understand the mechanisms of pHi regulation in smooth muscle.
- To determine the effects of pHi changes on smooth muscle contraction.
Main Methods:
- Measurement of intracellular pH (pHi) using microelectrodes.
- Measurement of intracellular pH (pHi) using nuclear magnetic resonance (NMR) spectroscopy.
Main Results:
- Tentative conclusion that pHi in smooth muscle is consistent across different types, averaging around 7.06 at 37°C.
- Evidence indicates that smooth muscle actively regulates its pHi, as H+ is not in equilibrium across the cell membrane.
- Preliminary findings suggest unique aspects of pHi regulation in smooth muscle compared to other muscle types.
- Intracellular acidification in some smooth muscles can lead to increased force production, a phenomenon not observed in striated muscles.
Conclusions:
- Intracellular pH (pHi) in smooth muscle is approximately 7.06 and is actively regulated.
- Smooth muscle pHi regulation may differ from other muscle types.
- Changes in pHi significantly affect smooth muscle function, including contraction force.