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LC-MS/MS proteomics analysis of neuronal cells and secretomes with timsTOF Pro

ABSTRACT: The neuropeptide VGF was recently proposed as a neurodegeneration biomarker. The Parkinson's disease-related protein leucine-rich repeat kinase 2 (LRRK2) regulates endolysosomal dynamics, a process that involves SNARE-mediated membrane fusion and could regulate secretion. Here we investigate potential biochemical and functional links between LRRK2 and v-SNAREs. We find that LRRK2 directly interacts with the v-SNAREs VAMP4 and VAMP7. Secretomics reveals VGF secretory defects in VAMP4 and VAMP7 knockout (KO) neuronal cells. In contrast, VAMP2 KO "regulated secretion-null" and ATG5 KO "autophagy-null" cells release more VGF. VGF is partially associated with extracellular vesicles and LAMP1+ endolysosomes. LRRK2 expression increases VGF perinuclear localization and impairs its secretion. Retention using selective hooks (RUSH) assays show that a pool of VGF traffics through VAMP4+ and VAMP7+ compartments, and LRRK2 expression delays its transport to the cell periphery. Overexpression of LRRK2 or VAMP7-longin domain impairs VGF peripheral localization in primary cultured neurons. Altogether, our results suggest that LRRK2 might regulate VGF secretion via interaction with VAMP4 and VAMP7.

INSTRUMENT(S): timsTOF Pro

ORGANISM(S): Rattus Norvegicus (rat)

TISSUE(S): Cell Culture

DISEASE(S): Parkinson's Disease

SUBMITTER: Chiara guerrera

LAB HEAD: Chiara Guerrera

PROVIDER: PXD028321 | Pride | 2023-01-31

REPOSITORIES: Pride

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			Action	DRS
	210312_ThGA_105min_V4_S_1_Slot1-73_1_226.d.zip	Other
	210312_ThGA_105min_V4_S_2_Slot1-74_1_227.d.zip	Other
	210312_ThGA_105min_V4_S_3_Slot1-75_1_228.d.zip	Other
	210312_ThGA_105min_V7_S_1_Slot1-79_1_232.d.zip	Other
	210312_ThGA_105min_V7_S_2_Slot1-80_1_233.d.zip	Other

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