Abstract
Creatine is synthesized by S-adenosylmethionine:guanidinoacetate N-methyltransferase (GAMT), and the creatine/phosphocreatine shuttle system mediated by creatine kinase (CK) is essential for storage and regeneration of high-energy phosphates in cells. Although the importance of this system in brain development is evidenced by the hereditary nature of creatine deficiency syndrome, the spatiotemporal cellular expression patterns of GAMT in developing brain remain unknown. Here we show that two waves of high GAMT expression occur in developing mouse brain. The first involves high expression in mitotic cells in the ventricular zone of the brain wall and the external granular layer of the cerebellum at the embryonic and neonatal stages. The second was initiated by striking up-regulation of GAMT in oligodendrocytes during the second and third postnatal weeks (i.e., the active myelination stage), which continued to adulthood. Distinct temporal patterns were also evident in other cell types. GAMT was highly expressed in perivascular pericytes and smooth muscle cells after birth, but not in adults. In neurons, GAMT levels were low to moderate in neuroblasts residing in the ventricular zone, increased during the second postnatal week when active dendritogenesis and synaptogenesis occur, and decreased to very low levels thereafter. Moderate levels were observed in astrocytes throughout development. The highly regulated, cell type-dependent expression of GAMT suggests that local creatine biosynthesis plays critical roles in certain phases of neural development. In accordance with this idea, we observed increased CK expression in differentiating neurons; this would increase creatine/phosphocreatine shuttle system activity, which might reflect increased energy demand.
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Abbreviations
- BLBP:
-
Brain-type lipid-binding protein
- CK:
-
Creatine kinase
- CK-B:
-
Brain-type cytoplasmic creatine kinase
- GAMT:
-
S-adenosylmethionine:guanidinoacetate N-methyltransferase
- GFAP:
-
Glial fibrillary acidic protein
- GLUT:
-
Glucose transporter
- MAP:
-
Microtubule associated protein
- PLP:
-
Proteolipid protein
- SMA:
-
Smooth muscle actin
- uCK-Mi:
-
Ubiquitous mitochondrial creatine kinase
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Acknowledgements
This study was supported in part by the Japan Agency for Medical Research and Development (AMED) Practical Research Project for Rare/Intractable Diseases and a Grant-in-Aid for Challenging Exploratory Research (16K15153) from the Japan Society for the Promotion of Science, Japan. The authors thank A. Niitomi, and N. Handa for secretarial assistance.
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Tachikawa, M., Watanabe, M., Fukaya, M. et al. Cell-Type-Specific Spatiotemporal Expression of Creatine Biosynthetic Enzyme S-adenosylmethionine:guanidinoacetate N-methyltransferase in Developing Mouse Brain. Neurochem Res 43, 500–510 (2018). https://doi.org/10.1007/s11064-017-2446-y
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DOI: https://doi.org/10.1007/s11064-017-2446-y