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Study of the Effects of L-tryptophane Nanoparticles on Motor Behavior in Alzheimer's Experimental Models

[ Vol. 18 , Issue. 1 ]

Author(s):

Andressa Leticia Miri*, Andressa Panegalli Hosni, Jossinelma Camargo Gomes, Rubiana Mara Mainardes, Najeh Maissar Khalil, Rossana Gabriela del Jesus Vásquez Marcano, Mário César da Silva Pereira and Ivo Ilvan Kerppers   Pages 44 - 51 ( 8 )

Abstract:


Background: Alzheimer's disease (AD) is a neurodegenerative disease characterized by the progressive and incapacitating decay of cognitive, neuropsychiatric, and behavioral manifestations. L-tryptophan is the precursor amino acid of serotonin, which is a neurotransmitter responsible for mood balance and the sense of well-being and can be administered in the form of nanoparticles. Objective: This study analyzed the effectiveness of L-tryptophan nanoparticles and L-tryptophan on behavioral physiological alterations resulting from AD in animal models.

Method: The sample consisted of 50 Rattus norvegicus rats, divided in 10 groups with 5 animals each: one negative control (NC), three positive control groups (C3, C7, and C21), three groups treated with L-tryptophan nanoparticles (T3N, T7N, and T21N) at the concentration of 1.5 mg, and three groups treated with L-tryptophan (T3L, T7L, and T21L) at the concentration of 1.5 mg. The rats underwent stereotactic surgery to induce AD through the injection of amyloid beta-amyloid peptide1-42 in the intracerebroventricular region. All rats were submitted to pre- and post-surgery and post-treatment motor behavior evaluation through the Later Water Maze (LWM) and elevated cross-labyrinth (ECL). Histological analysis was performed to verify the presence of senile plaques, and the statistical analysis used the unpaired T-test.

Results: Significant intergroup differences were observed in some of the evaluated parameters between treated and untreated groups.

Conclusion: It was concluded that the treatment with L-tryptophan nanoparticles was beneficial to improve behavioral reactions in the Alzheimer's model.

Keywords:

Dementia, serotonin, neuroinflammation, neurodegeneration, neuroscience, nanoscience.

Affiliation:

Undergraduate Student at the Physiotherapy Course, Universidade Estadual do Centro-Oeste, Guarapuava, PR, Undergraduate Student at the Physiotherapy Course, Universidade Estadual do Centro-Oeste, Guarapuava, PR, Undergraduate Student at the Physiotherapy Course, Universidade Estadual do Centro-Oeste, Guarapuava, PR, Department of Pharmacy, Universidade Estadual do Centro-Oeste, Guarapuava, PR, Department of Pharmacy, Universidade Estadual do Centro-Oeste, Guarapuava, PR, Post-graduate Program in Pharmaceutical Sciences, Universidade Estadual do Centro-Oeste, Guarapuava, PR, Department of Physiotherapy Course, Universidade Estadual do Centro-Oeste, PR, Department of Physiotherapy Course, Universidade Estadual do Centro-Oeste, PR



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