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Neuroprotective role of taurine during aging

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An Erratum to this article was published on 20 December 2013

Abstract

Aging of the brain is characterized by several neurochemical modifications involving structural proteins, neurotransmitters, neuropeptides and related receptors. Alterations of neurochemical indices of synaptic function are indicators of age-related impairment of central functions, such as locomotion, memory and sensory performances. Several studies demonstrate that ionotropic GABA receptors, glutamate decarboxylase (GAD), and somatostatinergic subpopulations of GABAergic neurons are markedly decreased in experimental animal brains during aging. Additionally, levels of several neuropeptides co-expressed with GAD decrease during aging. Thus, the age-related decline in cognitive functions could be attributable, at least in part, to decrements in GABA inhibitory neurotransmission. In this study, we showed that chronic supplementation of taurine to aged mice significantly ameliorated the age-dependent decline in spatial memory acquisition and retention. We also demonstrated that concomitant with the amelioration in cognitive function, taurine caused significant alterations in the GABAergic and somatostatinergic system. These changes included (1) increased levels of the neurotransmitters GABA and glutamate, (2) increased expression of both isoforms of GAD (65 and 67) and the neuropeptide somatostatin, (3) decreased hippocampal expression of the β3 subunits of the GABAA receptor, (4) increased expression in the number of somatostatin-positive neurons, (5) increased amplitude and duration of population spikes recorded from CA1 in response to Schaefer collateral stimulation and (6) enhanced paired pulse facilitation in the hippocampus. These specific alterations of the inhibitory system caused by taurine treatment oppose those naturally occurring in the aging brain, suggesting a protective role of taurine in this process. An increased understanding of age-related neurochemical changes in the GABAergic system will be important in elucidating the underpinnings of the functional changes of aging. Taurine supplementation might help forestall the age-related decline in cognitive functions through interaction with the GABAergic system.

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Abbreviations

GAD:

Glutamate decarboxylase

GABA:

γ-Aminobutyric acid

SST:

Somatostatin

DEPC:

Diethylpyrocarbonate

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Acknowledgments

Support for this work was provided by the College of Staten Island/CUNY, PSC-CUNY, and CDN-IBR and FRAXA. Support for the confocal microscope came from the National Science Foundation.

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The authors declare that they have no conflict of interest.

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El Idrissi, A., Shen, C.H. & L’Amoreaux, W.J. Neuroprotective role of taurine during aging. Amino Acids 45, 735–750 (2013). https://doi.org/10.1007/s00726-013-1544-7

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