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Developmental changes in intracellular pH buffering power in smooth muscle
A J Bullock1, R A Duquette, N Buttell
1Physiological Laboratory, University of Liverpool, Crown Street, Liverpool L69 3BX, UK.
Pflugers Archiv : European Journal of Physiology
|April 4, 1998
Summary
Neonatal smooth muscles exhibit distinct buffering capacities compared to adults, influencing their response to pH changes. These developmental differences in buffering power and pH regulation are crucial for understanding tissue function.
Area of Science:
- Physiology
- Developmental Biology
- Biochemistry
Background:
- Intracellular pH (pHi) significantly influences smooth muscle contraction.
- Neonatal tissues may exhibit different contractile responses to stimuli altering pHi compared to adult tissues.
- Buffering capacity (beta) and extracellular pH (pHo) to pHi transmission affect functional responses to pH perturbations.
Purpose of the Study:
- To determine the intrinsic buffering power (beta) in neonatal and adult ureteric, uterine, and gastric smooth muscles.
- To assess the effect of extracellular pH (pHo) changes on intracellular pH (pHi) in these tissues.
- To compare developmental and tissue-specific differences in pH regulation.
Main Methods:
- Utilized the pH-sensitive fluorophore carboxy-SNARF.
- Measured intrinsic buffering power (beta) in isolated smooth muscle tissues.
- Investigated the relationship between extracellular pH (pHo) and intracellular pH (pHi) changes.
Main Results:
- Adult ureteric, uterine, and gastric smooth muscles showed similar buffering power.
- Significant differences in buffering power were observed among neonatal smooth muscle tissues.
- Little difference in the transmission of pHo changes to pHi occurred between neonatal and adult tissues of the same muscle type, but differences existed between muscle types.
Conclusions:
- Significant developmental and tissue-specific differences exist in smooth muscle pH regulation.
- These variations in buffering capacity and pH transmission may influence tissue protection during pH perturbations.
- Understanding these differences is key to explaining varied functional responses in neonatal versus adult smooth muscles.