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2015 ; 10
(ä): 69
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Beclin 1 regulates neuronal transforming growth factor-? signaling by mediating
recycling of the type I receptor ALK5
#MMPMID26692002
O'Brien CE
; Bonanno L
; Zhang H
; Wyss-Coray T
Mol Neurodegener
2015[Dec]; 10
(ä): 69
PMID26692002
show ga
BACKGROUND: Beclin 1 is a key regulator of multiple trafficking pathways,
including autophagy and receptor recycling in yeast and microglia. Decreased
beclin 1 levels in the CNS result in neurodegeneration, an effect attributed to
impaired autophagy. However, neurons also rely heavily on trophic factors, and
signaling through these pathways requires the proper trafficking of trophic
factor receptors. RESULTS: We discovered that beclin 1 regulates signaling
through the neuroprotective TGF-? pathway. Beclin 1 is required for recycling of
the type I TGF-? receptor ALK5. We show that beclin 1 recruits the retromer to
ALK5 and facilitates its localization to Rab11(+) endosomes. Decreased levels of
beclin 1, or its binding partners VPS34 and UVRAG, impair TGF-? signaling.
CONCLUSIONS: These findings identify beclin 1 as a positive regulator of a
trophic signaling pathway via receptor recycling, and suggest that neuronal death
induced by decreased beclin 1 levels may also be due to impaired trophic factor
signaling.