The stress response neuropeptide CRF increases amyloid-ß production by regulating γ-secretase activity.
EMBO J
; 34(12): 1674-86, 2015 Jun 12.
Article
en En
| MEDLINE
| ID: mdl-25964433
ABSTRACT
The biological underpinnings linking stress to Alzheimer's disease (AD) risk are poorly understood. We investigated how corticotrophin releasing factor (CRF), a critical stress response mediator, influences amyloid-ß (Aß) production. In cells, CRF treatment increases Aß production and triggers CRF receptor 1 (CRFR1) and γ-secretase internalization. Co-immunoprecipitation studies establish that γ-secretase associates with CRFR1; this is mediated by ß-arrestin binding motifs. Additionally, CRFR1 and γ-secretase co-localize in lipid raft fractions, with increased γ-secretase accumulation upon CRF treatment. CRF treatment also increases γ-secretase activity in vitro, revealing a second, receptor-independent mechanism of action. CRF is the first endogenous neuropeptide that can be shown to directly modulate γ-secretase activity. Unexpectedly, CRFR1 antagonists also increased Aß. These data collectively link CRF to increased Aß through γ-secretase and provide mechanistic insight into how stress may increase AD risk. They also suggest that direct targeting of CRF might be necessary to effectively modulate this pathway for therapeutic benefit in AD, as CRFR1 antagonists increase Aß and in some cases preferentially increase Aß42 via complex effects on γ-secretase.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Estrés Fisiológico
/
Hormona Liberadora de Corticotropina
/
Péptidos beta-Amiloides
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Secretasas de la Proteína Precursora del Amiloide
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Enfermedad de Alzheimer
/
Modelos Biológicos
Tipo de estudio:
Etiology_studies
/
Prognostic_studies
Límite:
Animals
/
Humans
Idioma:
En
Revista:
EMBO J
Año:
2015
Tipo del documento:
Article
País de afiliación:
Gabón