The contractile vacuole in Ca2+-regulation in Dictyostelium: its essential function for cAMP-induced Ca2+-influx
2006
The Role of Contractile Vacuoles in Calcium Regulation in Dictyostelium
publication
Evidence: high
Author Information
Author(s): Malchow Dieter, Lusche Daniel F, Schlatterer Christina, De Lozanne Arturo, Müller-Taubenberger Annette
Hypothesis
The contractile vacuole (CV) functions as a Ca2+-store that is essential for cAMP-induced Ca2+-influx in Dictyostelium.
Conclusion
The contractile vacuoles in Dictyostelium are crucial for cAMP-induced Ca2+-influx and act as an efficient acidic Ca2+-store.
Supporting Evidence
- The contractile vacuoles were shown to accumulate and release Ca2+ for the first time.
- cAMP-induced Ca2+-influx was severely reduced in the LvsA mutant, indicating the importance of functional CV.
- Calmodulin antagonists were found to inhibit Ca2+-transport in the CV.
Takeaway
The contractile vacuoles help Dictyostelium cells manage calcium, which is important for their functions, especially when they need to respond to signals.
Methodology
The study involved purifying contractile vacuoles using GFP-tagging and measuring their Ca2+-transport and release capabilities.
Digital Object Identifier (DOI)
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