L-Dopa improves learning and maintenance of new nouns in healthy adults

Copland, D.; Alana, Campbell; Rawlings, Alicia; Katie, McMahon; Silburn, Peter A.; Pradeep, Nathan

doi:10.3389/conf.fnhum.2015.217.00165

Cited by 1 publication

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“…Dysfunctions in the dopamine and L-DOPA signaling systems have been strongly associated with FTD etiology (139,(147)(148)(149). OA1 is a discrete L-DOPA receptor, and given that FTD is often presented with linguistic abnormalities it is interesting to note that L-DOPA has been demonstrated to engender a highly specific semantic nootropic effect (150,151). We also noted a significant reduction in hippocampal T1R3KO expression of Slc6a17 (sodium-dependent neutral amino acid transporter Slc6a17), in which homozygous mutations are linked with FTD-like neuropathologies including, diminished cognitive ability, linguistic degradation, and psychosocial deficits (152).…”

Section: T1r3 Ko Mice Have Altered Cognitive Functionmentioning

confidence: 99%

Altered learning, memory, and social behavior in type 1 taste receptor subunit 3 knock-out mice are associated with neuronal dysfunction

Martin

Wang

et al. 2017

Journal of Biological Chemistry

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The type 1 taste receptor member 3 (T1R3) is a G protein-coupled receptor involved in sweet-taste perception. Besides the tongue, the T1R3 receptor is highly expressed in brain areas implicated in cognition, including the hippocampus and cortex. As cognitive decline is often preceded by significant metabolic or endocrinological dysfunctions regulated by the sweet-taste perception system, we hypothesized that a disruption of the sweet-taste perception in the brain could have a key role in the development of cognitive dysfunction. To assess the importance of the sweet-taste receptors in the brain, we conducted transcriptomic and proteomic analyses of cortical and hippocampal tissues isolated from T1R3 knock-out (T1R3KO) mice. The effect of an impaired sweet-taste perception system on cognition functions were examined by analyzing synaptic integrity and performing animal behavior on T1R3KO mice. Although T1R3KO mice did not present a metabolically disrupted phenotype, bioinformatic interpretation of the high-dimensionality data indicated a strong neurodegenerative signature associated with significant alterations in pathways involved in neuritogenesis, dendritic growth, and synaptogenesis. Furthermore, a significantly reduced dendritic spine density was observed in T1R3KO mice together with alterations in learning and memory functions as well as sociability deficits. Taken together our data suggest that the sweet-taste receptor system plays an important neurotrophic role in the extralingual central nervous tissue that underpins synaptic function, memory acquisition, and social behavior.

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