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InsP3- and Ca2(+)-induced Ca2+ release in single mouse oocytes
1Dip. di Fisiologia e Biochimica Gen. dell'Universitá di Milano, Italy.
FEBS Letters
|November 26, 1990
Summary
Mouse oocytes mobilize intracellular calcium (Ca2+) via a Ca2(+)-induced Ca2(+)-release mechanism. Photo-released inositol-1,4,5 triphosphate (InsP3) triggers Ca2+ oscillations and transients, revealing key cellular signaling pathways.
Area of Science:
- Cellular biology
- Biochemistry
- Reproductive biology
Background:
- Intracellular calcium (Ca2+) is crucial for cellular processes.
- Understanding Ca2+ mobilization mechanisms is vital for cell signaling research.
Purpose of the Study:
- To investigate the mechanism of intracellular Ca2+ mobilization in mouse oocytes.
- To elucidate the role of inositol-1,4,5 triphosphate (InsP3) in Ca2+ release.
Main Methods:
- Mouse oocytes were micro-injected with 'caged'-InsP3 and the Ca2+ indicator Fluo-3.
- Photo-release of InsP3 was used to induce and monitor Ca2+ redistribution.
- Direct Ca2+ injections were performed to test for autoregenerative transients.
Main Results:
- Photo-released InsP3 induced [Ca2+]i changes with distinct kinetic phases and threshold behavior.
- Single InsP3 pulses frequently triggered Ca2+ oscillations.
- Ca2+ injections demonstrated autoregenerative Ca2+ transients.
Conclusions:
- Mouse oocytes possess a Ca2(+)-induced Ca2(+)-release mechanism.
- InsP3 plays a significant role in initiating Ca2+ signaling events, including oscillations.