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| Registros recuperados: 13 | |
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| CAVALCANTE,LENY A.; GARCIA-ABREU,JOSÉ; MOURA NETO,VIVALDO; SILVA,LUIZ CLAUDIO; WEISSMÜLLER,GILBERTO. |
| Bilaterally symmetric organisms need to exchange information between the left and right sides of their bodies to integrate sensory input and to coordinate motor control. Thus, an important choice point for developing axons is the Central Nervous System (CNS) midline. Crossing of this choice point is influenced by highly conserved, soluble or membrane-bound molecules such as the L1 subfamily, laminin, netrins, slits, semaphorins, Eph-receptors and ephrins, etc. Furthermore, there is much circumstantial evidence for a role of proteoglycans (PGs) or their glycosaminoglycan (GAG) moieties on axonal growth and guidance, most of which was derived from simplified models. A model of intermediate complexity is that of cocultures of young neurons and astroglial... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Astrocytes; Axon growth; Extracellular matrix; Heparan sulfate; Midline; Midbrain. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652002000400010 |
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| Reyes-Haro,Daniel; Mora-Loyola,Ernesto; Soria-Ortiz,Berenice; García-Colunga,Jesús. |
| Axons and glial cells are the main components of white matter. The corpus callosum (CC) is the largest white matter tract in mammals; in rodents, 99% of the cells correspond to glia after postnatal day 5 (P5). The area of the CC varies through life and regional differences related to the number of axons have been previously described. Whether glial cell density varies accordingly is unknown; thus the aim of this study was to estimate glial cell density for the genu, body and splenium -the three main regions of CC-, of P6 and P30 rats. Here we report that the density of CC glial cells reduced by ~10% from P6 to P30. Even so, the density of astrocytes showed a slight increase (+6%), probably due to differentiation of glioblasts. Interestingly, glial cell... |
| Tipo: Journal article |
Palavras-chave: Astrocytes; Corpus callosum; Genu; Glial cells; Splenium. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000100004 |
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| Barreto,George Emílio Sampaio; Oliveira,Elineusa Silva de; Villar,Flávio Augusto Guerreiro Aragão de; Santos,Gleide Souza dos; Lima,Rute Maria Ferreira; Costa,Silvia Lima; Costa,Maria de Fátima Dias; Egito,Eryvaldo Sócrates Tabosa; El-Bachá,Ramon Santos. |
| The aim of this work was to study the effects of 3MC on the peroxidation of biomolecules in nuclear fractions and nonsynaptic mitochondrial respiration in organelles obtained from rat brains. The cytotoxicity towards rat primary astrocytes in vitro was also tested. 3MC at 1mM oxidized consuming oxygen at a rate of 1.98 ± 0.19 µM.min-1 and formed reactive quinones. At the same concentration, 3MC induced peroxidation of biomolecules in nuclear fractions obtained from rat brain homogenates and inhibited state 2 FADH2-linked respiration in nonsynaptic mitochondria. Furthermore, 3MC oxidized in the culture medium, leading to the formation of quinones. This toluene metabolite was cytotoxic to rat primary astrocytes. The concentration that killed 50% of cells... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Astrocytes; Brain; Cytotoxicity; 3-methylcatechol; Peroxidation; Respiration. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000500012 |
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| Cavalcante,L.A.; Garcia-Abreu,J.; Mendes,F.A.; Moura Neto,V.; Silva,L.C.F.; Onofre,G.; Weissmüller,G.; Carvalho,S.L.. |
| Proteoglycans are abundant in the developing brain and there is much circumstantial evidence for their roles in directional neuronal movements such as cell body migration and axonal growth. We have developed an in vitro model of astrocyte cultures of the lateral and medial sectors of the embryonic mouse midbrain, that differ in their ability to support neuritic growth of young midbrain neurons, and we have searched for the role of interactive proteins and proteoglycans in this model. Neurite production in co-cultures reveals that, irrespective of the previous location of neurons in the midbrain, medial astrocytes exert an inhibitory or nonpermissive effect on neuritic growth that is correlated to a higher content of both heparan and chondroitin sulfates... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Astrocytes; Axonal growth; Chondroitin sulfate; Heparan sulfate; Midline; Midbrain. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000800005 |
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| Maia-Farias,A.; Lima,C.M.; Freitas,P.S.L.; Diniz,D.G.; Rodrigues,A.P.D.; Quaresma,J.A.S.; Diniz,C.W. Picanço; Diniz,J.A.. |
| Maraba virus is a member of the genus Vesiculovirus of the Rhabdoviridae family that was isolated in 1983 from sandflies captured in the municipality of Maraba, state of Pará, Amazônia, Brazil. Despite 30 years having passed since its isolation, little is known about the neuropathology induced by the Maraba virus. Accordingly, in this study the histopathological features, inflammatory glial changes, cytokine concentrations, and nitric oxide activity in the encephalon of adult mice subjected to Maraba virus nostril infection were evaluated. The results showed that 6 days after intranasal inoculation, severe neuropathological-associated disease signs appeared, including edema, necrosis and pyknosis of neurons, generalized congestion of encephalic vessels,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Maraba virus; Vesiculovirus; Microglia; Astrocytes; Cytokines; Nitric oxide. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2020000400610 |
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| The fundamental role of N-methyl-D-aspartate (NMDA) receptors in many cortical functions has been firmly defined, as has its involvement in a number of neurological and psychiatric diseases. However, until recently very little was known about the anatomical localization of NMDA receptors in the cerebral cortex of mammals. The recent application of molecular biological techniques to the study of NMDA receptors has provided specific tools which have greatly expanded our understanding of the localization of NMDA receptors in the cerebral cortex. In particular, immunocytochemical studies on the distribution of cortical NMDA receptors have shown that NMDA receptors are preferentially localized on dendritic spines, have disclosed an unknown fraction of... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Glutamate; Ionotropic receptors; Autoreceptors; Heteroreceptors; Astrocytes; Neuron-glia signaling. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000500001 |
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| Menezes,J.R.L.; Marins,M.; Alves,J.A.J.; Fróes,M.M.; Hedin-Pereira,C.. |
| New neurons are constantly added to the olfactory bulb of rodents from birth to adulthood. This accretion is not only dependent on sustained neurogenesis, but also on the migration of neuroblasts and immature neurons from the cortical and striatal subventricular zone (SVZ) to the olfactory bulb. Migration along this long tangential pathway, known as the rostral migratory stream (RMS), is in many ways opposite to the classical radial migration of immature neurons: it is faster, spans a longer distance, does not require radial glial guidance, and is not limited to postmitotic neurons. In recent years many molecules have been found to be expressed specifically in this pathway and to directly affect this migration. Soluble factors with inhibitory, attractive... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Postnatal neurogenesis; Chain migration; Rostral migratory stream; Astrocytes; Gap junctions; Radial glia. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002001200002 |
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| Borges,B.C.; Rorato,R.; Antunes-Rodrigues,J; Elias,L.L.K.. |
| We evaluated the expression of glial fibrillary acidic protein (GFAP), glutamine synthetase (GS), ionized calcium binding adaptor protein-1 (Iba-1), and ferritin in rats after single or repeated lipopolysaccharide (LPS) treatment, which is known to induce endotoxin tolerance and glial activation. Male Wistar rats (200-250 g) received ip injections of LPS (100 µg/kg) or saline for 6 days: 6 saline (N = 5), 5 saline + 1 LPS (N = 6) and 6 LPS (N = 6). After the sixth injection, the rats were perfused and the brains were collected for immunohistochemistry. After a single LPS dose, the number of GFAP-positive cells increased in the hypothalamic arcuate nucleus (ARC; 1 LPS: 35.6 ± 1.4 vs control: 23.1 ± 2.5) and hippocampus (1 LPS: 165.0 ± 3.0 vs control: 137.5... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: LPS tolerance; Astrocytes; Microglia; Glial fibrillary acidic protein; Iba-1; Glutamine synthetase; Ferritin. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2012000800014 |
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| Registros recuperados: 13 | |
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