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Early growth response factor-1 (EGR-1) is an immediate early gene, which is rapidly activated in quiescent cells by mitogens or in postmitotic neurons after depolarization. EGR-1 has been involved in diverse biological functions such as cell growth, differentiation and apoptosis. Here we report that enforced expression of the EGR-1 gene induces apoptosis,(More)
In most neurodegenerative disorders, including multiple sclerosis, Parkinson disease, and Alzheimer disease, a massive neuronal cell death occurs as a consequence of an uncontrolled inflammatory response, where activated astrocytes and microglia and their cytotoxic agents play a crucial pathological role. Current treatments for these diseases are not(More)
To define at the molecular biological level the effects of thyroid hormone on brain development we have examined cDNA clones of brain mRNAs and identified several whose expression is altered in hypothyroid animals during the neonatal period. Clones were identified with probes prepared by subtractive or differential hybridization, and those corresponding to(More)
Inflammation and neurodegeneration coexist in many acute damage and chronic CNS disorders (e.g., stroke, Alzheimer's disease, Parkinson's disease). A well characterized animal model of brain damage involves administration of kainic acid, which causes limbic seizure activity and subsequent neuronal death, especially in the CA1 and CA3 pyramidal cells and(More)
Alterations in motor functions are well-characterized features observed in humans and experimental animals subjected to thyroid hormone dysfunctions during development. Here we show that congenitally hypothyroid rats display hyperactivity in the adult life. This phenotype was associated with a decreased content of cannabinoid receptor type 1 (CB(1)) mRNA in(More)
We recently demonstrated that thyroid hormone is an important regulator of mitochondrial gene expression during brain development. To gain further insights into the consequences of this regulation, we have performed functional and structural analysis of brain mitochondria from control and hypothyroid neonatal rats. Flow cytometric analysis showed a(More)
The effect of thyroid hormone and retinoic acid on the expression of CCAAT/enhancer binding proteins (C/EBPs) alpha and beta was investigated in rat liver during development. Congenital hypothyroidism caused a significant decrease in both C/EBP alpha and C/EBP beta gene expression at early stages of postnatal development. This effect was tissue specific(More)
We have quantitated in adult and developing rat tissues the molar concentrations of c-erbA alpha 1- and beta 1-mRNAs, which code for nuclear T3-binding proteins, and c-erbA alpha 2-mRNA, which is generated by alternate splicing of the alpha gene transcript and codes for a receptor variant that does not bind T3. Comparison of the concentrations of c-erbA(More)
We have examined pathological criteria in 16 cases of infratentorial ependymomas of childhood using a conventional histological approach, with immunohistochemistry and silver nucleolar organizer region staining (AgNORs). We have found that some of these criteria are of prognostic value. The following histological features were evaluated in each case:(More)
We have determined the concentration of thyroid hormone receptor binding sites in nuclear extracts derived from rat fetal organs throughout gestation and the postnatal period. Before day 14 of gestation nuclear extracts were obtained from whole fetuses. No receptor binding activity could be detected at day 12 of gestational age, and small amounts were(More)