14-3-3θ phosphorylation exacerbates alpha-synuclein aggregation and toxicity.

ABSTRACT: Aggregation of alpha-synuclein (αsyn) plays an integral role in Parkinson's disease (PD) and Dementia with Lewy bodies (DLB). 14-3-3θ is a highly expressed brain protein with chaperone-like activity that regulates αsyn folding. 14-3-3θ overexpression reduces αsyn aggregation, transmission between cells, and neuronal loss, while 14-3-3 inhibition promotes αsyn pathology. We previously observed increased 14-3-3θ phosphorylation at serine 232 in human PD and DLB brains. Here we examine 14-3-3θ phosphorylation's effects on αsyn aggregation and toxicity. Using a paracrine αsyn model, we found that the non-phosphorylatable S232A 14-3-3θ protected while the phosphomimetic S232D 14-3-3θ failed to protect against αsyn paracrine toxicity. The S232A mutant reduced oligomerization of released αsyn whi

SUBMITTER: Wang B 

PROVIDER: S-EPMC11932739 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature