Facultad de Medicina

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Examinando Facultad de Medicina por Materia "a7-nAChR"

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    The human-specific duplicated α7 gene inhibits the ancestral α7, negatively regulating nicotinic acetylcholine receptor-mediated transmitter release
    (American Society for Biochemistry and Molecular Biology, 2020-10-22) Martín-Sánchez, Carolina; Alés, Eva; Balseiro-Gómez, Santiago; Atienza, Gema; Arnalich, Francisco; Bordas, Anna; Cedillo, José L; Extremera, María; Chávez-Reyes, Arturo; Montiel, Carmen
    Gene duplication generates new functions and traits, enabling evolution. Human-specific duplicated genes in particular are primary sources of innovation during our evo- lution although they have very few known functions. Here we examine the brain function of one of these genes (CHRFAM7A) and its product (dupα7 subunit). This gene results from a partial duplication of the ancestral CHRNA7 gene encoding the α7 subunit that forms the homopentameric α7 nicotinic acetylcholine receptor (α7-nAChR). The functions of α7- nAChR in the brain are well defined, including the modula- tion of synaptic transmission and plasticity underlying normal attention, cognition, learning, and memory processes. Howev- er, the role of the dupα7 subunit remains unexplored at the neuronal level. Here, we characterize that role by combining immunoblotting, quantitative RT-PCR and FRET techniques with functional assays of α7-nAChR activity using human neuroblastoma SH-SY5Y cell variants with different dupα7 expression levels. Our findings reveal a physical interaction between dupα7 and α7 subunits in fluorescent protein-tagged dupα7/α7 transfected cells that negatively affects normal α7-nAChR activity. Specifically, in both single cells and cell populations, the [Ca2+]i signal and the exocytotic response induced by selective stimulation of α7-nAChR were either significantly inhibited by stable dupα7 overexpression or augmented after silencing dupα7 gene expression with specific siRNAs. These findings identify a new role for the dupα7 subunit as a negative regulator of α7-nAChR-mediated control of exocytotic neurotransmitter release. If this effect is exces- sive, it would result in an impaired synaptic transmission that could underlie the neurocognitive and neuropsychiatric dis- orders associated with α7-nAChR dysfunction.