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Updated: Jul 20, 2026
10:24
Xenopus laevis as a Model to Identify Translation Impairment
Published on: September 27, 2015
Requirement for MAPK activation for normal mitotic progression in Xenopus egg extracts
1Department of Molecular Pharmacology, Stanford University School of Medicine, Stanford, CA 94305-5332, USA.
Science (New York, N.Y.)
|November 13, 1998
Summary
Mitogen-activated protein kinase (MAPK) is crucial for maintaining mitosis. Its activator, MEK, and MAPK ensure proper mitotic progression and microtubule formation in Xenopus egg extracts.
Area of Science:
- Cell Biology
- Molecular Biology
- Developmental Biology
Background:
- Mitogen-activated protein kinase (MAPK) is essential for meiotic M phase progression in Xenopus oocytes.
- The role of MAPK in somatic cell mitosis remains less understood.
Purpose of the Study:
- To investigate the function of p42 MAPK in normal mitotic progression.
- To determine if MAPK signaling is involved in regulating the mitotic state.
Main Methods:
- Utilized cycling Xenopus egg extracts.
- Employed immunodepletion of MEK (MAPK activator).
- Used the MEK inhibitor PD98059.
Main Results:
- MAPK was transiently activated during mitosis, downstream of Cdc2-cyclin B.
- Inhibiting MEK or MAPK led to premature mitotic termination and abnormal microtubule formation.
- Sustained MAPK activation caused mitotic arrest independent of Cdc2-cyclin B.
Conclusions:
- MEK and MAPK play a critical role in maintaining the mitotic state.
- MAPK signaling is essential for proper mitotic progression and microtubule dynamics.
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