Evolution of several cytoskeletal proteins of astrocytes in primary culture: Effect of prenatal alcohol exposure (original) (raw)

Glial Fibrillary Acidic Protein Expression in Rat Brain and in Radial Glia Culture Is Delayed by Prenatal Ethanol Exposure

Journal of Neurochemistry, 2002

Abstract: The alterations in astrocyte proliferation and differentiation induced by prenatal exposure to alcohol (PEA) suggest that ethanol exposure affects the radial glial cells, the main astrocytic precursors. We have investigated the effects of ethanol on the early stages of astrogliogenesis by analyzing the developmental pattern of vimentin and glial fibrillary acidic protein (GFAP) immunoreactivity and their mRNA levels during embryonic/fetal brain development and in radial glia in primary culture. GFAP appeared late in gestation and at day 5 of culture of radial glial, whereas GFAP mRNA was first detected on fetal day 15 and increased in content on fetal day 21. In contrast, the levels of vimentin and its mRNA were high at fetal day 15 but decreased on day 21. Alcohol exposure delays the appearance of GFAP and its mRNA and significantly decreases the GFAP expression in fetal brain and in primary culture of radial glial. In addition, some morphological alterations were observed in PEA glial cells in culture. These results demonstrate that astroglial precursor cells are damaged by prenatal exposure to ethanol and suggest that abnormalities in the astrogliogenesis may underlie the disruption in neuronal migration and other CNS alterations observed after prenatal ethanol exposure.

Chronic Ethanol-Induced Glial Fibrillary Acidic Protein (GFAP) Immunoreactivity: An Immunocytochemical Observation in Various Regions of Adult Rat Brain

International …, 2009

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Developmental pattern of GFAP and vimentin gene expression in rat brain and in radial glial cultures

Glia, 1995

Exposure to ethanol during fetal development reduces the astroglial-specific marker glial fibrillary acidic protein (GFAP) and its mRNA levels in brains of fetal rats and in radial glia in primary culture, affecting the proliferation and differentiation of astrocytes. The objectives of this study were to evaluate the possible effect of ethanol on GFAP mRNA levels in astrocytes and to investigate the molecular mechanism(s) involved in ethanol-induced changes in GFAP expression by analyzing the GFAP transcription rate, GFAP mRNA stability, and GFAP DNA methylation. We show here that prenatal exposure to ethanol reduces significantly GFAP immunoreactivity and its mRNA levels in both astrocytes in primary culture and brains of pups from alcohol-fed mothers. Runoff experiments from nuclei of astrocytes indicate that ethanol exposure decreases GFAP transcription rate significantly and reduces GFAP mRNA stability slightly. DNA methylation analysis indicates that prenatal ethanol exposure induces a hypermethylated state of the GFAP DNA in fetal brains. Methylation-mediated repression of GFAP transcription could be a mechanism involved in ethanolinduced reduction of GFAP expression. Ethanol-induced alterations in GFAP expression and astroglial development may underlie the CNS dysfunctions observed after prenatal alcohol exposure. Key Words: Prenatal ethanol exposure-Brain development-Astrocytes in culture-Glial fibrillary acidic protein-Vimentin-mRNA-Transcription-Runoff-mRNA stability-Methylation-Fetal alcohol syndrome.

Effects of chronic ethanol treatment on glial fibrillary acidic protein expression in adult rat optic nerve: an immunocytochemical study

Cell Biology International, 2005

Glial fibrillary acidic protein (GFAP) is used as a marker of astrocyte response to various central nervous system injuries. In the present study, the effects of chronic ethanol administration on GFAP immunoreactivity were evaluated in astrocytes of the adult optic nerve head. The results demonstrated that ethanol exposure significantly and dramatically increases GFAP immunoreactivity and the number of immunoreactive astrocytes (p!0:001). In addition, GFAP immunoreactive cells in the optic nerve showed extensive hypertrophy (p!0:001).

Ethanol Exposure Affects Glial Fibrillary Acidic Protein Gene Expression and Transcription During Rat Brain Development

Journal of Neurochemistry, 2002

Abstract: Exposure to ethanol during fetal development reduces the astroglial-specific marker glial fibrillary acidic protein (GFAP) and its mRNA levels in brains of fetal rats and in radial glia in primary culture, affecting the proliferation and differentiation of astrocytes. The objectives of this study were to evaluate the possible effect of ethanol on GFAP mRNA levels in astrocytes and to investigate the molecular mechanism(s) involved in ethanol-induced changes in GFAP expression by analyzing the GFAP transcription rate, GFAP mRNA stability, and GFAP DNA methylation. We show here that prenatal exposure to ethanol reduces significantly GFAP immunoreactivity and its mRNA levels in both astrocytes in primary culture and brains of pups from alcohol-fed mothers. Runoff experiments from nuclei of astrocytes indicate that ethanol exposure decreases GFAP transcription rate significantly and reduces GFAP mRNA stability slightly. DNA methylation analysis indicates that prenatal ethanol exposure induces a hypermethylated state of the GFAP DNA in fetal brains. Methylation-mediated repression of GFAP transcription could be a mechanism involved in ethanol-induced reduction of GFAP expression. Ethanol-induced alterations in GFAP expression and astroglial development may underlie the CNS dysfunctions observed after prenatal alcohol exposure.

Effect of prenatal exposure to alcohol on membrane-bound enzymes during astrocyte development in vivo and in primary culture

The International journal of developmental biology, 1989

In the present work we have analyzed the effect of prenatal ethanol exposure on the activity of several glial marker and functional enzymes during the development of astrocytes isolated from rat brain as well as in primary culture. The activity of marker enzymes glutamine synthetase and butylcholinesterase showed no differences between isolated astrocytes from 15 and 70 day old control rats. However, the activity of the membrane-bound enzymes (Na+K)ATPase and 5'-nucleotidase was higher in astrocytes from 70 day old control rats than in those from 15 day old animals. Although the pattern found in astrocytes from alcohol-exposed rats was similar to that of controls, the levels of activity of the enzymes were lower in alcoholic than in control animals. When control astrocytes in primary culture were used, the activity of (Na+K)ATPase and 5'-nucleotidase increased throughout the entire culture period. In contrast, the maximal activity of glutamine synthetase was found at 7 days ...

Ethanol perturbs the secretory pathway in astrocytes

Neurobiology of Disease, 2005

Ethanol exposure induces retention of glycoproteins in growing astrocytes. We examined the intracellular sites at which this retention occurs and investigated whether this effect is accompanied by alterations in the Golgi complex and microtubular system. We studied the effects of ethanol on the Golgi complex structure, as well as on the secretory pathway functionality by monitoring both the transport of the VSV-G protein and the protein levels of several molecules involved in the regulation of this pathway. Ethanol was found to delay VSV-G transport, modify Golgi complex morphology, and reduce the number of secretory vesicles. Moreover, ethanol affected the levels of mannosidase II, p58, BCOP, rbet1, and several Rab GTPases. It also affected microtubule organization and polymerization and the levels of the motor proteins kinesin and dynein. Most of these effects were dosedependent. These alterations, together with those previously reported concerning biosynthesis of glycoconjugates, provide novel insights into how ethanol impairs brain development. D