Mammalian septin Sept2 modulates the activity of GLAST, a glutamate transporter in astrocytes
| Autor: | Nagatoki Kinoshita, Chizuka Ide, Kazushi Kimura, Masahiro Fukaya, Naoya Matsumoto, Masahiko Watanabe |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
SEPT2
Cerebellum Amino Acid Transport System X-AG media_common.quotation_subject Glutamic Acid macromolecular substances GTPase Biology Septin Guanosine Diphosphate Mice Genetics medicine Animals Internalization media_common fungi Brain Cell Biology Phosphoric Monoester Hydrolases Cell biology Vesicular transport protein medicine.anatomical_structure Organ Specificity Astrocytes Guanosine Triphosphate Cytokinesis Astrocyte |
| Zdroj: | Genes to Cells. 9:1-14 |
| ISSN: | 1365-2443 1356-9597 |
| DOI: | 10.1111/j.1356-9597.2004.00696.x |
| Popis: | Sept2 is a member of the septin family of GTPases. Septins form filaments in a GTP-form dependent manner, and are involved in cytokinesis from yeast to mammals; however, some mammalian septins, including Sept2, are expressed in the brain, a tissue in which almost all the cells are postmitotic. Recently, some functions of mammalian septin other than cytokinesis such as vesicle transport have been reported. However, mammalian septin's physiological functions are still unclear. The present study revealed that Sept2 co-localizes with the astrocyte glutamate transporter GLAST in the Bergmann glial processes facing axons and synapses. Biochemical analyses demonstrated that Sept2 bound directly to the carboxy-terminal region of GLAST in a GDP-form dependent manner. Expression of constitutive GDP-form Sept2 mutant reduced the glutamate uptake activity of GLAST via internalization of GLAST from cell surface. Thus Sept2 may regulate GLAST-mediated glutamate uptake by astrocytes, which is important for appropriate transmitter signalling in the cerebellum. |
| Databáze: | OpenAIRE |
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