Reduction in the neuronal surface of post and presynaptic GABA>B< receptors in the hippocampus in a mouse model of Alzheimer's disease

A. Martín-Belmonte, C. Aguado, R. Alfaro-Ruíz, A.E. Moreno-Martínez, L. De La Ossa, J. Martínez-Hernández, A. Buisson, S. Früh, B. Bettler, R. Shigemoto, Y. Fukazawa, R. Luján, Brain Pathology 30 (2020) 554–575.

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Journal Article | Published | English

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Author
Martín-Belmonte, Alejandro; Aguado, Carolina; Alfaro-Ruíz, Rocío; Moreno-Martínez, Ana Esther; De La Ossa, Luis; Martínez-Hernández, José; Buisson, Alain; Früh, Simon; Bettler, Bernhard; Shigemoto, RyuichiIST Austria ; Fukazawa, Yugo; Luján, Rafael
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Abstract
The hippocampus plays key roles in learning and memory and is a main target of Alzheimer's disease (AD), which causes progressive memory impairments. Despite numerous investigations about the processes required for the normal hippocampal functions, the neurotransmitter receptors involved in the synaptic deficits by which AD disables the hippocampus are not yet characterized. By combining histoblots, western blots, immunohistochemistry and high‐resolution immunoelectron microscopic methods for GABAB receptors, this study provides a quantitative description of the expression and the subcellular localization of GABAB1 in the hippocampus in a mouse model of AD at 1, 6 and 12 months of age. Western blots and histoblots showed that the total amount of protein and the laminar expression pattern of GABAB1 were similar in APP/PS1 mice and in age‐matched wild‐type mice. In contrast, immunoelectron microscopic techniques showed that the subcellular localization of GABAB1 subunit did not change significantly in APP/PS1 mice at 1 month of age, was significantly reduced in the stratum lacunosum‐moleculare of CA1 pyramidal cells at 6 months of age and significantly reduced at the membrane surface of CA1 pyramidal cells at 12 months of age. This reduction of plasma membrane GABAB1 was paralleled by a significant increase of the subunit at the intracellular sites. We further observed a decrease of membrane‐targeted GABAB receptors in axon terminals contacting CA1 pyramidal cells. Our data demonstrate compartment‐ and age‐dependent reduction of plasma membrane‐targeted GABAB receptors in the CA1 region of the hippocampus, suggesting that this decrease might be enough to alter the GABAB‐mediated synaptic transmission taking place in AD.
Publishing Year
Date Published
2020-05-01
Journal Title
Brain Pathology
Volume
30
Issue
3
Page
554-575
ISSN
eISSN
IST-REx-ID

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Martín-Belmonte A, Aguado C, Alfaro-Ruíz R, et al. Reduction in the neuronal surface of post and presynaptic GABA>B< receptors in the hippocampus in a mouse model of Alzheimer’s disease. Brain Pathology. 2020;30(3):554-575. doi:10.1111/bpa.12802
Martín-Belmonte, A., Aguado, C., Alfaro-Ruíz, R., Moreno-Martínez, A. E., De La Ossa, L., Martínez-Hernández, J., … Luján, R. (2020). Reduction in the neuronal surface of post and presynaptic GABA>B< receptors in the hippocampus in a mouse model of Alzheimer’s disease. Brain Pathology, 30(3), 554–575. https://doi.org/10.1111/bpa.12802
Martín-Belmonte, Alejandro, Carolina Aguado, Rocío Alfaro-Ruíz, Ana Esther Moreno-Martínez, Luis De La Ossa, José Martínez-Hernández, Alain Buisson, et al. “Reduction in the Neuronal Surface of Post and Presynaptic GABA>B< Receptors in the Hippocampus in a Mouse Model of Alzheimer’s Disease.” Brain Pathology 30, no. 3 (2020): 554–75. https://doi.org/10.1111/bpa.12802.
A. Martín-Belmonte et al., “Reduction in the neuronal surface of post and presynaptic GABA>B< receptors in the hippocampus in a mouse model of Alzheimer’s disease,” Brain Pathology, vol. 30, no. 3, pp. 554–575, 2020.
Martín-Belmonte A, Aguado C, Alfaro-Ruíz R, Moreno-Martínez AE, De La Ossa L, Martínez-Hernández J, Buisson A, Früh S, Bettler B, Shigemoto R, Fukazawa Y, Luján R. 2020. Reduction in the neuronal surface of post and presynaptic GABA>B< receptors in the hippocampus in a mouse model of Alzheimer’s disease. Brain Pathology. 30(3), 554–575.
Martín-Belmonte, Alejandro, et al. “Reduction in the Neuronal Surface of Post and Presynaptic GABA>B< Receptors in the Hippocampus in a Mouse Model of Alzheimer’s Disease.” Brain Pathology, vol. 30, no. 3, Wiley, 2020, pp. 554–75, doi:10.1111/bpa.12802.
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