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논문 기본 정보

자료유형
학술저널
저자정보
Kim Kyung-Ran (Seoul National University) Jeong Hyeon-Ju (Sungkyunkwan University) Kim Yoonsub (Seoul National University) Lee Seung Yeon (Seoul National University) Kim Yujin (Seoul National University) Kim Hyun-Ji (Sungkyunkwan University) Lee Suk-Ho (Seoul National University) Cho Hana (Sungkyunkwan University) Kang Jong-Sun (Sungkyunkwan University) Ho Won-Kyung (Seoul National University)
저널정보
대한생화학·분자생물학회 Experimental and Molecular Medicine Experimental and Molecular Medicine 제53권
발행연도
2021.7
수록면
1 - 14 (14page)
DOI
10.1038/s12276-021-00645-4

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Calbindin, a major Ca 2+ buffer in dentate granule cells (GCs), plays a critical role in shaping Ca 2+ signals, yet how it regulates neuronal function remains largely unknown. Here, we found that calbindin knockout (CBKO) mice exhibited dentate GC hyperexcitability and impaired pattern separation, which co-occurred with reduced K + current due to downregulated surface expression of Kv4.1. Relatedly, manipulation of calbindin expression in HT22 cells led to changes in CaMKII activation and the level of surface localization of Kv4.1 through phosphorylation at serine 555, confirming the mechanism underlying neuronal hyperexcitability in CBKO mice. We also discovered that Ca 2+ buffering capacity was significantly reduced in the GCs of Tg2576 mice to the level of CBKO GCs, and this reduction was restored to normal levels by antioxidants, suggesting that calbindin is a target of oxidative stress. Our data suggest that the regulation of CaMKII signaling by Ca 2+ buffering is crucial for neuronal excitability regulation.

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