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p34cdc2 homologue is located in nucleoli of the nervous and endocrine systems
H Ino1, T Mochizuki, N Yanaihara
1Third Department of Anatomy, Chiba University School of Medicine, Japan.
Abstract:
p34cdc2 protein kinase is a component of M phase-promoting factor (MPF), which plays an important role in controlling the mitotic and meiotic cell cycle. p34cdc2 contains a unique 16 amino acid sequence (PSTAIR) that is conserved from fission yeast to human. Using polyclonal anti-PSTAIR antibody, we detected the p34cdc2 homologue in the central nervous system of adult mice by western blotting. By immunohistochemical technique, we found that the p34cdc2 homologue was located in the nucleoli of neurons and glia in the central and peripheral nervous systems. In the central nervous system, positive cells were widely distributed from the cerebral cortex to the spinal cord. Immunoreactive cells were also detected in retina and pituitary. The evidence that the p34cdc2 is present in neurons which have lost the ability of cell division predicts another function of p34cdc2 family proteins besides the one that has generally recognized.
Insights
The p34cdc2 protein, crucial for cell division, is found in adult mouse neurons and glia. This suggests novel functions beyond its known role in the cell cycle.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- p34cdc2 protein kinase is a key component of M phase-promoting factor (MPF).
- MPF regulates the mitotic and meiotic cell cycles.
- p34cdc2 has a conserved PSTAIR sequence across species.
Purpose of the Study:
- To investigate the presence and location of p34cdc2 homologues in the adult mouse nervous system.
- To explore potential novel functions of p34cdc2 in non-dividing neurons.
Main Methods:
- Western blotting using polyclonal anti-PSTAIR antibody.
- Immunohistochemical techniques to detect p34cdc2 localization.
Main Results:
- p34cdc2 homologues were detected in the central nervous system of adult mice.
- The protein was localized to the nucleoli of neurons and glia in both central and peripheral nervous systems.
- Positive cells were widespread, including the cerebral cortex, spinal cord, retina, and pituitary.
Conclusions:
- p34cdc2 is present in adult mouse neurons, which typically do not divide.
- This finding indicates that p34cdc2 may have functions independent of cell cycle control.
- Further research is warranted to elucidate these alternative roles of p34cdc2 family proteins.