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논문 기본 정보

자료유형
학술저널
저자정보
이정무 (KU-KIST Graduate School of Converging Science and Technology Korea University) 사문선 (기초과학연구원) 안희영 (KU-KIST Graduate School of Converging Science and Technology Korea University Seoul 02841 KoreaCent) Kim Jong Min Joseph (Department of Molecular Biology Dankook University Cheonan) 권재 (KU-KIST Graduate School of Converging Science and Technology Korea University Seoul 02841 KoreaCent) 윤보은 (단국대학교) 이창준 (KU-KIST Graduate School of Converging Science and Technology Korea University Seoul 02841 KoreaCent)
저널정보
한국뇌신경과학회 Experimental Neurobiology Experimental Neurobiology Vol.31 No.3
발행연도
2022.6
수록면
158 - 172 (15page)
DOI
10.5607/en22016

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Monoamine oxidase B (MAOB) is a key enzyme for GABA production in astrocytes in several brain regions. To date, the role of astrocytic MAOB has been studied in MAOB null knockout (KO) mice, although MAOB is expressed throughout the body. Therefore, there has been a need for genetically engineered mice in which only astrocytic MAOB is targeted. Here, we generated an astrocyte-specific MAOB conditional KO (cKO) mouse line and characterized it in the cerebellar and striatal regions of the brain. Using the CRISPR-Cas9 gene-editing technique, we generated Maob floxed mice (B6-Maobem1Cjl /Ibs) which have floxed exons 2 and 3 of Maob with two loxP sites. By crossing these mice with hGFAP-CreERT2, we obtained Maob floxed::hGFAP-CreERT2 mice which have a property of tamoxifen-inducible ablation of Maob under the human GFAP (hGFAP) promoter. When we treated Maob floxed::hGFAP-CreERT2 mice with tamoxifen for 5 consecutive days, MAOB and GABA immunoreactivity were significantly reduced in striatal astrocytes as well as in Bergmann glia and lamellar astrocytes in the cerebellum, compared to sunflower oil-injected control mice. Moreover, astrocyte-specific MAOB cKO led to a 74.6% reduction in tonic GABA currents from granule cells and a 76.8% reduction from medium spiny neurons. Our results validate that astrocytic MAOB is a critical enzyme for the synthesis of GABA in astrocytes. We propose that this new mouse line could be widely used in studies of various brain diseases to elucidate the pathological role of astrocytic MAOB in the future.

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