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Reactive blue 2 induces calcium oscillations in HeLa cells
A Okuda1, K Furuya, T Kiyohara
1Department of Applied Biology, Kyoto Institute of Technology, Matsugasaki, Kyoto, 606-8585 Japan. okuda@bpe.es.osaka-u.ac.jp
The Japanese Journal of Physiology
|August 9, 2001
Summary
Reactive Blue 2 (RB) triggers calcium (Ca2+) oscillations in HeLa cells by activating the PLC cascade and intracellular Ca2+ release, dependent on extracellular Ca2+. This ATP receptor antagonist
Area of Science:
- Cellular Biology
- Biochemistry
- Pharmacology
Background:
- ATP receptor antagonists play a role in cellular signaling.
- Calcium (Ca2+) oscillations are crucial for various cellular processes.
- The Phospholipase C (PLC) cascade is a key signaling pathway.
Purpose of the Study:
- To investigate the mechanism by which Reactive Blue 2 (RB) induces Ca2+ oscillations in HeLa cells.
- To determine the role of extracellular Ca2+, Ca2+ influx, and the PLC cascade in RB-induced Ca2+ oscillations.
Main Methods:
- Induction of Ca2+ oscillations in HeLa cells using RB.
- Assessment of Ca2+ oscillations in Ca2+-free solutions.
- Measurement of Ca2+ influx using Mn2+ quenching.
- Inhibition studies using U73122 (PLC inhibitor) and thapsigargin (intracellular Ca2+ release inhibitor).
- Evaluation of RB's effect on histamine-induced Ca2+ responses.
Main Results:
- RB induced Ca2+ oscillations in HeLa cells.
- RB-induced oscillations were abolished in a Ca2+-free environment.
- RB did not inhibit Ca2+ influx.
- Inhibition of the PLC cascade or intracellular Ca2+ release abolished RB-induced oscillations.
- RB potentiated histamine-induced Ca2+ responses linked to the PLC cascade.
Conclusions:
- Reactive Blue 2 activates the PLC cascade in an extracellular Ca2+-dependent manner.
- RB induces Ca2+ oscillations through intracellular Ca2+ release, not Ca2+ influx.
- RB acts as an ATP receptor antagonist influencing Ca2+ signaling pathways.