Journal
NEUROMOLECULAR MEDICINE
Volume 11, Issue 2, Pages 63-75Publisher
HUMANA PRESS INC
DOI: 10.1007/s12017-009-8073-2
Keywords
Alzheimer's; Purinergic; P2X4; Receptor trafficking; Excitotoxicity
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Funding
- National Institutes of Health [R01AG023471]
- EUNICE KENNEDY SHRIVER NATIONAL INSTITUTE OF CHILD HEALTH & HUMAN DEVELOPMENT [ZIAHD000195] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE ON AGING [ZIAAG000317, ZIAAG000312, R01AG023471] Funding Source: NIH RePORTER
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Overproduction of the beta-amyloid fragment 1-42 (A beta(1-42)) is thought to contribute to synaptic dysfunction and neuronal death in Alzheimer's disease. Mounting evidence suggests that purinergic receptors play critical roles in synaptic plasticity and neuronal survival, but the potential involvement of these receptors in A beta(1-42)-induced synaptic dysfunction and neuronal death has not been addressed. Here we report that A beta(1-42) promoted accumulation of the calcium-permeable purinergic receptor P2X4 in neurons. We also report evidence that A beta(1-42) induced a caspase-3-mediated cleavage of the receptor that slowed channel closure times and prevented agonist-induced internalization of the receptor. Molecular interference to reduce the expression of P2X4 in primary rodent neurons attenuated A beta(1-42)-induced neuronal death while induced expression of P2X4 in a neuronal cell line that does not normally express P2-receptors enhanced the toxic effect of A beta(1-42). Together these findings suggest that A beta(1-42)-induced synaptic dysfunction and neuronal death may involve perturbations in P2X4 purinergic receptors.
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