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Berberine Alleviates Ischemic Brain Injury by Enhancing Autophagic Flux via Facilitation of TFEB Nuclear Translocation

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机构: [1]Kunming Univ Sci & Technol, Sch Basic Med Sci, 727 Jingming South Rd, Kunming 650500, Peoples R China [2]Kunming Univ Sci & Technol, Anning Peoples Hosp 1, 727 Jingming South Rd, Kunming 650500, Yunnan, Peoples R China
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关键词: Ischemic Stroke Berberine Autophagic/Lysosomal Signaling TFEB Nuclear Translocation Neuroprotection

摘要:
Berberine has been demonstrated to alleviate cerebral ischemia/reperfusion injury, but its neuroprotective mechanism has yet to be understood. Studies have indicated that ischemic neuronal damage was frequently driven by autophagic/lysosomal dysfunction, which could be restored by boosting transcription factor EB (TFEB) nuclear translocation. Therefore, this study investigated the pharmacological effects of berberine on TFEB-regulated autophagic/lysosomal signaling in neurons after cerebral stroke. A rat model of ischemic stroke and a neuronal ischemia model in HT22 cells were prepared using middle cerebral artery occlusion (MCAO) and oxygen-glucose deprivation (OGD), respectively. Berberine was pre-administered at a dose of 100mg/kg/d for three days in rats and 90 mu M in HT22 neurons for 12h. 24h after MCAO and 2h after OGD, the penumbral tissues and OGD neurons were obtained to detect nuclear and cytoplasmic TFEB, and the key proteins in the autophagic/lysosomal pathway were examined using western blot and immunofluorescence, respectively. Meanwhile, neuron survival, infarct volume, and neurological deficits were assessed to evaluate the therapeutic efficacy. The results showed that berberine prominently facilitated TFEB nuclear translocation, as indicated by increased nuclear expression in penumbral neurons as well as in OGD HT22 cells. Consequently, both autophagic activity and lysosomal capacity were simultaneously augmented to alleviate the ischemic injury. However, berberine-conferred neuroprotection could be greatly counteracted by lysosomal inhibitor Bafilomycin A1 (Baf-A1). Meanwhile, autophagy inhibitor 3-Methyladenine (3-MA) also slightly neutralized the pharmacological effect of berberine on ameliorating autophagic/lysosomal dysfunction. Our study suggests that berberine-induced neuroprotection against ischemic stroke is elicited by enhancing autophagic flux via facilitation of TFEB nuclear translocation in neurons.

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大类 | 2 区 医学
小类 | 2 区 全科医学与补充医学 2 区 医学:内科
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出版当年[2023]版:
Q1 MEDICINE, GENERAL & INTERNAL Q1 INTEGRATIVE & COMPLEMENTARY MEDICINE
最新[2023]版:
Q1 MEDICINE, GENERAL & INTERNAL Q1 INTEGRATIVE & COMPLEMENTARY MEDICINE

影响因子: 最新[2023版] 最新五年平均 出版当年[2023版] 出版当年五年平均 出版前一年[2022版]

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第一作者机构: [1]Kunming Univ Sci & Technol, Sch Basic Med Sci, 727 Jingming South Rd, Kunming 650500, Peoples R China
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通讯机构: [1]Kunming Univ Sci & Technol, Sch Basic Med Sci, 727 Jingming South Rd, Kunming 650500, Peoples R China [2]Kunming Univ Sci & Technol, Anning Peoples Hosp 1, 727 Jingming South Rd, Kunming 650500, Yunnan, Peoples R China [*1]Anning First People’s Hospital Affiliated to Kunming University of Science and Technology, No. 727 Jingming South Road, Chenggong District, Kunming, Yunnan 650500, China [*2]School of Basic Medical Sciences, Kunming University of Science and Technology, No. 727 Jingming South Road, Chenggong District, Kunming, Yunnan 650500, China
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