大酶B降解细胞外基质,促进炎症和胆道新血管化
Gideon Obasanmi1, Manjosh Uppal1, Jing Z Cui1
1Department of Ophthalmology and Visual Sciences, UBC, Vancouver, BC, Canada.
Angiogenesis
|March 18, 2024
概括
向Granzyme B (GzmB),一种在与年龄相关的黄斑变性 (AMD) 中升高的蛋白酶,可能为新血管AMD (nAMD) 提供一种新的治疗方法. 在临床前模型中,抑制GzmB降低了胆道新血管化.
科学领域:
- 眼科医生 眼科 眼科
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
背景情况:
- 与年龄相关的黄斑变性 (AMD) 是老年人视力丧失的主要原因.
- 新血管性AMD (nAMD),以胆道新血管化 (CNV) 为特征,是一种严重的AMD形式.
- 目前针对nAMD的抗血管性疗法并不普遍有效.
研究的目的:
- 调查Granzyme B (GzmB) 作为nAMD的新型治疗点.
- 探索细胞外GzmB在促进CNV和炎症中的作用.
- 在CNV的临床前模型中评估GzmB抑制的疗效.
主要方法:
- 用外源GzmB处理的RPE-choroidal拓展培养物得到治疗.
- 使用了GzmB的药理抑制剂和巨细胞降粒剂.
- 在GzmB缺乏的小鼠身上进行了激光诱导的CNV模型和电网红图 (ERG) 测试.
主要成果:
- 外源GzmB降解了细胞外基质 (ECM),促进了炎症和血管生成,并在扩展培养物中降低了血栓蛋白-1 (TSP-1).
- 抑制GzmB或巨细胞脱粒化显著降低了胆道血管生成.
- 在小鼠中,GzmB缺乏减弱了激光诱导的CNV和与年龄相关的ERG下降.
结论:
- 细胞外GzmB通过促进CNV和炎症,有助于nAMD的发病.
- 针对缺乏已知的内源抑制剂的蛋白酶GzmB,为nAMD提供了一个有前途的治疗策略.
- 药理上抑制GzmB提供了一种潜在的新疗法,可以抑制nAMD患者的CNV.
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