Amyloid beta peptide-(1-42) induces internalization and degradation of beta2 adrenergic receptors in prefrontal cortical neurons.
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ABSTRACT: Emerging evidence indicates that amyloid ? peptide (A?) initially induces subtle alterations in synaptic function in Alzheimer disease. We have recently shown that A? binds to ?(2) adrenergic receptor (?(2)AR) and activates protein kinase A (PKA) signaling for glutamatergic regulation of synaptic activities. Here we show that in the cerebrums of mice expressing human familial mutant presenilin 1 and amyloid precursor protein genes, the levels of ?(2)AR are drastically reduced. Moreover, A? induces internalization of transfected human ?(2)AR in fibroblasts and endogenous ?(2)AR in primary prefrontal cortical neurons. In fibroblasts, A? treatment also induces transportation of ?(2)AR into lysosome, and prolonged A? treatment causes ?(2)AR degradation. The A?-induced ?(2)AR internalization requires the N terminus of the receptor containing the peptide binding sites and phosphorylation of ?(2)AR by G protein-coupled receptor kinase, not by PKA. However, the G protein-coupled receptor kinase phosphorylation of ?(2)AR and the receptor internalization are much slower than that induced by ?AR agonist isoproterenol. The A?-induced ?(2)AR internalization is also dependent on adaptor protein arrestin 3 and GTPase dynamin, but not arrestin 2. Functionally, pretreatment of primary prefrontal cortical neurons with A? induces desensitization of ?(2)AR, which leads to attenuated response to subsequent stimulation with isoproterenol, including decreased cAMP levels, PKA activities, PKA phosphorylation of serine 845 on ?-amino-2,3-dihydro-5-methyl-3-oxo-4-isoxazolepropanoic acid (AMPA) receptor subunit 1 (GluR1), and AMPA receptor-mediated miniature excitatory postsynaptic currents. This study indicates that A? induces ?(2)AR internalization and degradation leading to impairment of adrenergic and glutamatergic activities.
SUBMITTER: Wang D
PROVIDER: S-EPMC3173113 | biostudies-literature | 2011 Sep
REPOSITORIES: biostudies-literature
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