在陶病症中,LRRK2-关联的-Rab12退行性溶解体的积累
Silas A Buck1,2,3, Tuyana Malankhanova3,4, Eileen B Ma1,2,3
1Department of Neurology, Duke University School of Medicine, Durham, NC, 27710, USA.
bioRxiv : the preprint server for biology
|July 15, 2025
概括
帕金森 帕金森症候群
科学领域:
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 氨酸丰富的重复激酶2 (LRRK2) 的突变与帕金森病 (PD) 有关,并导致内分泌体功能障碍.
- LRRK2突变提升了Rab12酸化,这是一个参与内解酶体通路的蛋白质.
- 异常的LRRK2活性和Rab酸化与神经退行性疾病有关.
研究的目的:
- 调查LRRK2-介导的Rab12酸化 (pS106-Rab12) 与各种神经退行性疾病中的tau/α-synuclein病理之间的关联.
- 确定pS106-Rab12水平和局部是否与疾病进展和特定病理相关.
主要方法:
- 开发了一种单克隆抗体来检测化Rab12在Ser106 (pS106-Rab12).
- 分析了脑组织溶解物,并对患有PD,患有勒维体痴呆症 (DLB),阿尔茨海默病 (AD) 和LRRK2突变载体的患者的样本进行了免疫组织化学.
- 检查了pS106-Rab12局部化在毛病症的小鼠模型和各种初级毛病症.
主要成果:
- 在DLB,AD,PD和LRRK2突变载体的大脑组织中,ps106-Rab12水平升高.
- 在疾病的早期阶段,pS106-Rab12在神经元内的粒状血管退化体 (GVBs) 中被发现,与tau病理共同积累.
- 在晚期病理阶段和初级病变中,pS106-Rab12也被检测到tau和α-synuclein包容的子集中.
结论:
- 升高的ps106-Rab12是LRRK2激酶活性在各种神经退行性疾病中的生物标志物.
- 通过LRRK2-介导的Rab12酸化有助于和α-synucleinopathies的内分泌体功能障碍.
- pS106-Rab12和GVB是神经退行性疾病病理的早期指标.
相关概念视频
Lysosomal Hydrolases
3.9K
Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
3.9K
Amyloid Fibrils
9.9K
Amyloid fibrils are aggregates of misfolded proteins. Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils.
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...
9.9K
Rab Cascades
2.7K
Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
2.7K


