1. Targeting cathepsin S promotes activation of OLF1-BDNF/TrkB axis to enhance cognitive function.
- Author
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Lee, Hao-Wei, Chen, Szu-Jung, Tsai, Kuen-Jer, Hsu, Kuei-Sen, Chen, Yi-Fan, Chang, Chih-Hua, Lin, Hsiao-Han, Hsueh, Wen-Yun, Hsieh, Hsing-Pang, Lee, Yueh-Feng, Chiang, Huai-Chueh, and Chang, Jang-Yang
- Subjects
COGNITIVE ability ,MAZE tests ,BRAIN-derived neurotrophic factor ,DENTATE gyrus ,LONG-term potentiation - Abstract
Background: Cathepsin S (CTSS) is a cysteine protease that played diverse roles in immunity, tumor metastasis, aging and other pathological alterations. At the cellular level, increased CTSS levels have been associated with the secretion of pro-inflammatory cytokines and disrupted the homeostasis of Ca
2+ flux. Once CTSS was suppressed, elevated levels of anti-inflammatory cytokines and changes of Ca2+ influx were observed. These findings have inspired us to explore the potential role of CTSS on cognitive functions. Methods: We conducted classic Y-maze and Barnes Maze tests to assess the spatial and working memory of Ctss−/− mice, Ctss+/+ mice and Ctss+/+ mice injected with the CTSS inhibitor (RJW-58). Ex vivo analyses including long-term potentiation (LTP), Golgi staining, immunofluorescence staining of sectioned whole brain tissues obtained from experimental animals were conducted. Furthermore, molecular studies were carried out using cultured HT-22 cell line and primary cortical neurons that treated with RJW-58 to comprehensively assess the gene and protein expressions. Results: Our findings reported that targeting cathepsin S (CTSS) yields improvements in cognitive function, enhancing both working and spatial memory in behavior models. Ex vivo studies showed elevated levels of long-term potentiation levels and increased synaptic complexity. Microarray analysis demonstrated that brain-derived neurotrophic factor (BDNF) was upregulated when CTSS was knocked down by using siRNA. Moreover, the pharmacological blockade of the CTSS enzymatic activity promoted BDNF expression in a dose- and time-dependent manner. Notably, the inhibition of CTSS was associated with increased neurogenesis in the murine dentate gyrus. These results suggested a promising role of CTSS modulation in cognitive enhancement and neurogenesis. Conclusion: Our findings suggest a critical role of CTSS in the regulation of cognitive function by modulating the Ca2+ influx, leading to enhanced activation of the BDNF/TrkB axis. Our study may provide a novel strategy for improving cognitive function by targeting CTSS. [ABSTRACT FROM AUTHOR]- Published
- 2024
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