ApoER2 processing by presenilin-1 modulates reelin expression

Valeria Balmaceda, Inmaculada Cuchillo-Ibáñez, Lluis Pujadas, María Salud García-Ayllón, Carlos A. Saura, Johannes Nimpf, Eduardo Soriano, Javier Sáez-Valero

Research output: Contribution to journalArticleResearchpeer-review

20 Citations (Scopus)

Abstract

The reelin signaling protein and its downstream components have been associated with synaptic plasticity and neurotransmission. The reelin signaling pathway begins with the binding of reelin to the transmembrane lipoprotein receptor apolipoprotein E receptor 2 (ApoER2), which in turns induces the sequential cleavage of ApoER2 by the sequential action of α- and γ-secretases. Using conditional-knockout mice of the catalytic component of the γ-secretase complex, presenilin 1 (PS1), we demonstrated increased brain ApoER2 and reelin protein and transcript levels, with no changes in the number of reelin-positive cells. Using the human SH-SY5Y neuroblastoma cell line, we showed that ApoER2 processing occurs in the presence of PS1, producing an intracellular ApoER2 C-terminal fragment. In addition, the pharmacologic inhibition of γ-secretase in SH-SY5Y cells led to increased reelin levels. Overexpression of ApoER2 decreased reelin mRNA levels in these cells. A luciferase reporter gene assay and nuclear fractionation confirmed that increased amounts of intracellular fragment of ApoER2 suppressed reelin expression at a transcriptional level. Chromatin immunoprecipitation experiments corroborated that the intracellular fragment of ApoER2 bound to the RELN promoter region. Our study suggests that PS1/γ-secretase-dependent processing of the reelin receptor ApoER2 inhibits reelin expression and may regulate its signaling. © FASEB.
Original languageEnglish
Pages (from-to)1543-1554
JournalFASEB Journal
Volume28
Issue number4
DOIs
Publication statusPublished - 1 Jan 2014

Keywords

  • Alzheimer's disease
  • Reelin
  • Transcription

Fingerprint

Dive into the research topics of 'ApoER2 processing by presenilin-1 modulates reelin expression'. Together they form a unique fingerprint.

Cite this