Abstract:
:Butyrate produced a biphasic modulation of the thyroid hormone receptor in neuroblastoma N2A cells increasing receptor number by 20-35% at concentrations 0.25-0.75 mM and decreasing receptor levels by 30-55% at 2-4 mM. The half-life of the receptor, as assessed by its disappearance after incubation with 18 microM cycloheximide was 8.4 hr in control cells and 10.3 hr and 5.0 hr in cells incubated with 0.25 and 4 mM butyrate, respectively. This compound increased the abundance of multyacetylated forms of histone H4 from 30% in control cells to almost 70% with butyrate 4 mM. In glioma C6 cells, the fatty acid produced a dose-dependent increase of receptor levels (up to 3-4-fold with 2-5 mM butyrate) and had little effect in increasing multiacetylation (from 30% in controls to 42-46% with 2-5 mM butyrate). Recent studies have shown that the c-erbA proto-oncogen codes for the thyroid hormone receptor. In N2A and C6 cells, 2 c-erbA-related mRNAs, one measuring 2.6 kb and the other 6 kb, were detected. Both forms were differently regulated by butyrate. This compound decreased the abundance of the 2.6 kb forms in both cell types, even at the concentrations at which there was an elevation of receptor levels. Only the largest mRNA correlated with receptor concentration increasing by 2-3-fold after treatment of C6 cells with butyrate, and undergoing a smaller but biphasic change in N2A cells. Our data suggest that modification of chromatin structure probably secondary to acetylation induces changes in thyroid hormone receptor levels in neuroblastoma and glioma cells by affecting both receptor stability and receptor mRNA levels.
journal_name
J Neurosci Resjournal_title
Journal of neuroscience researchauthors
Yusta B,Ortiz-Caro J,Bedo G,Pascual A,Aranda Adoi
10.1002/jnr.490270102subject
Has Abstractpub_date
1990-09-01 00:00:00pages
1-9issue
1eissn
0360-4012issn
1097-4547journal_volume
27pub_type
杂志文章abstract::C6 cells were adapted to proliferate in defined culture medium to allow the study of long-term effects of serum-free growth conditions on their phenotypic antigen expression and production of neurite promoting factors (NPFs). Cultures were grown in either Ham's F-12 or supplemented Opti-MEM-I containing 15% heat-inact...
journal_title:Journal of neuroscience research
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abstract::The twitcher mouse is well known as a naturally occurring authentic mouse model of human globoid cell leukodystrophy (GLD; Krabbe disease) due to genetic deficiency of lysosomal galactosylceramidase. The twitcher mice used most commonly are on the C57BL/6J background. We generated twitcher mice that were on the mixed ...
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journal_title:Journal of neuroscience research
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doi:10.1002/jnr.490320108
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journal_title:Journal of neuroscience research
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更新日期:2011-05-01 00:00:00
abstract::Production of hydrogen peroxide as a by-product of the breakdown of catecholamines by the enzyme monoamine oxidase (MAO) has been hypothesized to contribute to the increased proclivity of dopaminergic neurons for oxidative injury. We established clonal dopaminergic PC12 cell lines which have elevated MAO activity leve...
journal_title:Journal of neuroscience research
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abstract::In this report, we address the molecular mechanisms that regulate axonal growth by focusing on the gene for one of the major axonal cytoskeletal proteins, T alpha1 alpha-tubulin. During the developmental growth of sympathetic neurons, transcription of a beta-galactosidase transgene driven by the T alpha1 promoter (T a...
journal_title:Journal of neuroscience research
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doi:
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journal_title:Journal of neuroscience research
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journal_title:Journal of neuroscience research
pub_type: 杂志文章
doi:10.1002/jnr.490150209
更新日期:1986-01-01 00:00:00
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journal_title:Journal of neuroscience research
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doi:10.1002/jnr.10549
更新日期:2003-04-01 00:00:00
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journal_title:Journal of neuroscience research
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更新日期:2008-01-01 00:00:00
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journal_title:Journal of neuroscience research
pub_type: 杂志文章
doi:10.1002/jnr.490280405
更新日期:1991-04-01 00:00:00
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journal_title:Journal of neuroscience research
pub_type: 杂志文章
doi:10.1002/jnr.22219
更新日期:2010-02-15 00:00:00
abstract::The interleukin (IL)-15-dependent immune responses of murine microglia were strongly affected by low concentrations of the ganglioside GD3. The ganglioside binding to IL-15 inhibited the proinflammatory effects of the cytokine, reducing IL-15-dependent T-cell proliferation as well as mRNA expression for IL-15Ralpha, p...
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