Abstract
The amino acids taurine and alanine play a role in several physiological processes, including behavior and the electrical activity of the brain. In this study, we investigated the effect of treatment with taurine or alanine on anxiety-like behavior and the excitability-dependent phenomenon known as cortical spreading depression (CSD), using rats suckled in litters with 9 and 15 pups (groups L9 and L15). From postnatal days 7 to 27, the animals received per gavage 300 mg/kg/day of taurine or alanine or both. At 28 days, we tested the animals in the elevated plus maze, and at 33–35 days, we recorded CSD and analyzed its velocity of propagation, amplitude, and duration. Compared with water-treated controls, the L9 groups treated with taurine or alanine displayed anxiolytic behavior (higher number of entries in the open arms; p < 0.05), and reduced CSD velocity (p < 0.001). The effect of both amino acids on CSD was also found in the L15 groups and in five additional L9 groups (naïve, water, taurine, alanine, or both) treated at adulthood (90–110 days). The L15 condition resulted in smaller durations and higher CSD velocities compared with the L9 condition. Besides reinforcing previous evidence of behavioral modulation by taurine and alanine, our data are the first confirmation that treatment with these amino acids decelerates CSD regardless of lactation conditions (normal versus unfavorable lactation) or age at amino acid administration (young versus adult). The results suggest a modulating role for both amino acids on anxiety behavior and neuronal electrical activity.
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Acknowledgments
The authors thank the following Brazilian agencies for financial support: Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação de Amparo à Ciência e Tecnologia de Pernambuco (FACEPE-IBPG-0141-2.07/12), Instituto Brasileiro de Neurociências (IBN-Net/Finepno.4191), and Capes (Edital 043/2013 Ciências Do Mar II). RCA Guedes is a Research Fellow from CNPq (No. 301190/2010-0).
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Francisco, E.S., Guedes, R.C.A. Neonatal taurine and alanine modulate anxiety-like behavior and decelerate cortical spreading depression in rats previously suckled under different litter sizes. Amino Acids 47, 2437–2445 (2015). https://doi.org/10.1007/s00726-015-2036-8
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DOI: https://doi.org/10.1007/s00726-015-2036-8