Organic Anion Transporter 1 Deficiency Accelerates Learning and Memory Impairment in tg2576 Mice by Damaging Dendritic Spine Morphology and Activity
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Published on: February 26, 2014
Xinlin Wu1, Jianqing Zhang, Heng Liu
1Department of Traditional Chinese Medicine, The First Affiliated Hospital, Sun Yat-sen University, 58 Second Zhongshan Road, Guangzhou, 510080, China, wuxinlin670522@gmail.com.
Abstract:
To investigate whether and how organic anion transporter 1 (OAT1) is involved in the process of Alzheimer's disease (AD), we crossbred OAT1 knockout mice with tg2576, the widely used AD model mice. Results here showed the heterozygous OAT1-deficient tg2576 mice developed a learning- and memory-related behavior deficiency and higher soluble Abeta amount in early stage (3 months old). Furthermore, the heterozygous mice brain slice also showed impaired long-term potentiation (LTP) and spontaneous excitatory postsynaptic currents (sEPSC). By crossbreeding heterozygous OAT1-deficient tg2576 mice with Thy-1 YFP mice, we got autofluoresced (layer 4/5 cortical neuron) heterozygous mice. By using two-photon microscope in the direct observation of mice brain in vivo or single photon confocal on slices, compared with control tg2576 mice, we found that the OAT1-deficient mice showed a higher spine numbers but with a much lesser maturity extent. Finally, by using glutamate uncaging method, we induced chemical LTP in brain slices and found that OAT1-deficient mice showed abnormal chemical-induced LTP, which meant that the deficient behavior may be caused by abnormal spine morphology and activity. Our results indicated OAT1 may be involved in AD process by regulating spine morphology and activity.
Insights
Organic anion transporter 1 (OAT1) deficiency in Alzheimer's disease (AD) models impairs learning, memory, and synaptic function. OAT1 may influence AD progression by affecting neuronal spine development and activity.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Alzheimer's disease (AD) is a progressive neurodegenerative disorder characterized by cognitive decline.
- Organic anion transporter 1 (OAT1) plays a role in the transport of various organic anions in the body, but its involvement in AD pathogenesis is unclear.
Purpose of the Study:
- To investigate the role of OAT1 in Alzheimer's disease (AD) pathogenesis.
- To determine if OAT1 deficiency impacts learning, memory, and synaptic function in AD model mice.
Main Methods:
- Crossbreeding OAT1 knockout mice with tg2576 AD model mice.
- Behavioral tests for learning and memory.
- Electrophysiological recordings (LTP, sEPSC) in brain slices.
- In vivo and ex vivo imaging of neuronal morphology (spine number and maturity).
- Glutamate uncaging to induce and assess chemical LTP.
Main Results:
- Heterozygous OAT1-deficient tg2576 mice exhibited learning/memory deficits and increased soluble amyloid-beta (Abeta) at 3 months.
- Impaired long-term potentiation (LTP) and spontaneous excitatory postsynaptic currents (sEPSC) were observed in OAT1-deficient mice.
- OAT1-deficient mice showed increased but less mature dendritic spines, indicating abnormal spine development.
- Chemical LTP induction was abnormal in OAT1-deficient mice, suggesting impaired synaptic plasticity.
Conclusions:
- OAT1 deficiency exacerbates AD-like pathology and cognitive deficits in tg2576 mice.
- OAT1 appears to be involved in AD pathogenesis by regulating dendritic spine morphology and synaptic activity.
- Targeting OAT1 may offer a novel therapeutic strategy for Alzheimer's disease.
