TY - JOUR
T1 - Kainic acid does not affect CA3 hippocampal region pyramidal cells in hypothyroid rats
AU - Alva-Sánchez, Claudia
AU - Ortiz-Butrón, Rocío
AU - Pacheco-Rosado, Jorge
N1 - Funding Information:
This work was supported by CGPI-IPN (200446). R.O.-B. and J.P.-R. are fellows of DEDICT-COFAA-IPN. C.A.-S. is a fellow of CONACyT. Thanks to Dr. Ellis Glazier for editing the English-language text.
PY - 2004/3/15
Y1 - 2004/3/15
N2 - Thyroid hormones exert a crucial role on trophic events of the central nervous system during development, adulthood, and ageing. The deficiency of thyroid hormones could also produce a deficiency in neurotransmission in the hippocampal region. Kainic acid (KA) has become an important tool for studying functions related to excitatory amino acid transmission in mammals. Its neurotoxic effects on the pyramidal neurons of the CA3 hippocampal region are well known. We have examined the neurotoxicity of KA on these cells in hypothyroid rats. The hypothyroid state was induced by administration of methimazole. After 4 weeks of treatment, KA was administered once intraperitoneally at doses of 0, 1, 2.5, and 5 mg/kg to the hypothyroid group, and 0 and 5 mg/kg to the euthyroid group. In the euthyroid group, KA reduced the neuronal density in the CA3 hippocampal region, and in the hypothyroid rats with no administration of KA, the neuronal density of the CA3 hippocampal region is reduced also. Administering KA in hypothyroid rats did not reduce the number of CA3 pyramidal cells.
AB - Thyroid hormones exert a crucial role on trophic events of the central nervous system during development, adulthood, and ageing. The deficiency of thyroid hormones could also produce a deficiency in neurotransmission in the hippocampal region. Kainic acid (KA) has become an important tool for studying functions related to excitatory amino acid transmission in mammals. Its neurotoxic effects on the pyramidal neurons of the CA3 hippocampal region are well known. We have examined the neurotoxicity of KA on these cells in hypothyroid rats. The hypothyroid state was induced by administration of methimazole. After 4 weeks of treatment, KA was administered once intraperitoneally at doses of 0, 1, 2.5, and 5 mg/kg to the hypothyroid group, and 0 and 5 mg/kg to the euthyroid group. In the euthyroid group, KA reduced the neuronal density in the CA3 hippocampal region, and in the hypothyroid rats with no administration of KA, the neuronal density of the CA3 hippocampal region is reduced also. Administering KA in hypothyroid rats did not reduce the number of CA3 pyramidal cells.
KW - Neuronal density
KW - Neurotoxicity
UR - http://www.scopus.com/inward/record.url?scp=2342468775&partnerID=8YFLogxK
U2 - 10.1016/j.brainresbull.2004.02.002
DO - 10.1016/j.brainresbull.2004.02.002
M3 - Artículo
C2 - 15130707
SN - 0361-9230
VL - 63
SP - 167
EP - 171
JO - Brain Research Bulletin
JF - Brain Research Bulletin
IS - 2
ER -