Pro-cathepsin D, Prosaposin, and Progranulin: Lysosomal Networks in Parkinsonism.

Abstract

Mutations in GBA1, the gene encoding the lysosomal hydrolase glucocerebrosidase (GCase), are a risk factor for parkinsonism. Pursuing the potential mechanisms underlying this risk in aging neurons, we propose a new network uniting three major lysosomal proteins: (i) cathepsin D (CTSD), which plays a major role in α-synuclein (SNCA) degradation and prosaposin (PSAP) cleavage; (ii) PSAP, essential for GCase activation and progranulin (PGRN) transport; and (iii) PGRN, impacting lysosomal biogenesis, PSAP trafficking, and CTSD maturation. We hypothesize that alterations to this network and associated receptors modify lysosomal function and subsequently impact both SNCA degradation and GCase activity. By exploring the interactions between this protein trio and each of their respective transporters and receptors, we may identify secondary risk factors that provide insight into the relationship between these lysosomal proteins, GCase, and SNCA, and reveal novel therapeutic targets.

• Authors: Nahid Tayebi, Grisel Lopez, Jenny Do, Ellen Sidransky
• Journal: Trends in molecular medicine (Trends Mol Med) Vol. 26 Issue 10 Pg. 913-923 (10 2020) ISSN: 1471-499X [Electronic] England
• PMID: 32948448 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Review)
• Copyright: Published by Elsevier Ltd.

Chemical References

• Enzyme Precursors
• Progranulins
• Saposins
• procathepsin D
• Cathepsin D

Topics

• Animals
• Cathepsin D (genetics)
• Enzyme Precursors (genetics)
• Humans
• Lysosomes (genetics)
• Mutation (genetics)
• Parkinsonian Disorders (genetics)
• Progranulins (genetics)
• Protein Transport (genetics)
• Saposins (genetics)