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Transient increase in intracellular pH during Dictyostelium differentiation
The Journal of Cell Biology
|November 1, 1984
Summary
Dictyostelium discoideum amebae exhibit a transient intracellular alkalinization during differentiation. This pH shift, dependent on sodium, is crucial for initiating the organism's developmental program.
Area of Science:
- Cell Biology
- Developmental Biology
- Biochemistry
Background:
- Intracellular pH (pHi) regulation is vital for cellular processes.
- Dictyostelium discoideum serves as a model organism for studying cellular differentiation.
Purpose of the Study:
- To investigate the role of intracellular pH changes during Dictyostelium discoideum differentiation.
- To determine the mechanisms and significance of pHi fluctuations in developmental initiation.
Main Methods:
- Utilized pH-dependent fluorescein fluorescence to measure intracellular pH in Dictyostelium discoideum.
- Manipulated extracellular sodium concentrations and employed amiloride to assess the sodium dependence of pHi changes.
- Observed the impact of preventing alkalinization on the differentiation process.
Main Results:
- A transient intracellular alkalinization (pHi increase to 7.13) was observed approximately 2 hours into differentiation.
- This alkalinization was dependent on extracellular sodium and could be inhibited by amiloride.
- Inhibition of the alkalinization event prevented normal progression of cellular differentiation.
- The pHi returned to baseline levels (6.2-6.4) after the transient increase.
Conclusions:
- The transient intracellular alkalinization is a critical, sodium-dependent event initiating the differentiation program in Dictyostelium discoideum.
- Disruption of this pH shift significantly impairs the developmental process.
- Intracellular pH dynamics play a major role in regulating the initiation of multicellular development.