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Published on: November 17, 2009
Differential expression of 14-3-3 protein isoforms in developing rat hippocampus, cortex, rostral migratory stream,
Takahiko Umahara1, Toshiki Uchihara, Ayako Nakamura
1Department of Geriatric Medicine, Tokyo Medical University, 6-7-1 Nishishinjuku, Shinjuku-ku, Tokyo 160-0023, Japan. takahiko@tokyo-med.ac.jp
Insights
This study maps the expression of 14-3-3 protein isoforms in developing rat brains, revealing distinct roles for each isoform in neuronal development and synaptogenesis.
Area of Science:
- Neuroscience
- Developmental Biology
- Molecular Biology
Background:
- 14-3-3 proteins are crucial regulators of cellular processes.
- Seven distinct isoforms of 14-3-3 proteins exist, each potentially having unique functions.
- Understanding their developmental roles is key to comprehending brain formation.
Purpose of the Study:
- To investigate the differential expression patterns of all seven 14-3-3 protein isoforms during postnatal rat brain development.
- To correlate specific isoform localization with key developmental events like synaptogenesis.
- To elucidate the individual contributions of 14-3-3 isoforms to brain maturation.
Main Methods:
- Utilized immunohistochemistry on Wistar rat brains at various postnatal stages (P2, P7, P14, P21, P100).
- Employed antibodies specific to each of the seven 14-3-3 isoforms and a common antibody.
- Examined expression patterns in critical brain regions: hippocampus, cortex, rostral migratory stream (RMS), olfactory bulb, and white matter.
Main Results:
- Common 14-3-3 expression initiated in the olfactory bulb (P2) and hippocampus (P7), increasing with development, mirroring beta, gamma, and eta isoforms.
- Epsilon isoform showed early cortical neuron/glia expression (P2), intensifying in the neuropil (post-P7) and notably in hippocampal mossy fiber regions, suggesting synaptogenesis involvement.
- Sigma, zeta, and tau isoforms displayed distinct nuclear and white matter localizations, particularly in oligodendroglia, implicating them in specific developmental processes.
Conclusions:
- The seven 14-3-3 protein isoforms exhibit distinct spatio-temporal expression patterns during postnatal rat brain development.
- Isoform-specific localization suggests unique roles in neuronal development, differentiation, and synaptogenesis.
- These findings highlight the specialized functions of 14-3-3 isoforms in the intricate process of brain maturation.
Abstract:
We investigated the differential immunoexpression of 14-3-3 proteins according to their 7 isoforms during the postnatal development of rat brains, primarily in the hippocampus, cortex, rostral migratory stream (RMS), olfactory bulb, and white matter. Wistar rats at different developmental stages, on postnatal days 2 (P2), P7, P14, P21 and P100 were obtained, and were incubated with each type of anti-14-3-3 isoform antibody. 14-3-3 common (COM)-like immunoreactivity (IR) which represents an epitope shared among the 7 isoforms was initially expressed in the olfactory bulb on P2. This IR was partially expressed in the dentate granule cells and hippocampal pyramidal neurons from P7, and increased during development. These chronological changes were similar to those obtained with beta, gamma, and eta isoforms. Epsilon isoform-like IR was initially identified in the cell body of cortical neurons and glia-like cells on P2. After P7, the IR was more intense in the neuropil of the cortex. This epsilon isoform-like IR was markedly accentuated in the stratum lucidum of the hippocampus after P7, where hippocampal mossy fibers terminate, functioning as a giant synapse. This suggests that epsilon isoforms may be associated with synaptogenesis of the hippocampal mossy fibers. Sigma isoform-like IR was observed in the nuclei of external plexiform layer cells of the olfactory bulb from P2 to P21, in the nuclei of the hippocampal pyramidal and dentate granule cells after P7 and in the nuclei of RMS cells after P7. Zeta and tau isoform-like IRs were mainly identified in the white matter and in oligodendroglial cells from P7 to P21. Different immunolocalizations of the 7 isoforms suggest that 14-3-3 protein isoforms are individually associated with neuronal development and synaptogenesis during postnatal formation of the rat brain.
