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Registros recuperados: 10
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Calcium and cell death signaling in neurodegeneration and aging Anais da ABC (AABC)
Smaili,Soraya; Hirata,Hanako; Ureshino,Rodrigo; Monteforte,Priscila T.; Morales,Ana P.; Muler,Mari L.; Terashima,Juliana; Oseki,Karen; Rosenstock,Tatiana R.; Lopes,Guiomar S.; Bincoletto,Claudia.
Transient increase in cytosolic (Cac2+) and mitochondrial Ca2+ (Ca m2+) are essential elements in the control of many physiological processes. However, sustained increases in Ca c2+ and Ca m2+ may contribute to oxidative stress and cell death. Several events are related to the increase in Ca m2+, including regulation and activation of a number of Ca2+ dependent enzymes, such as phospholipases, proteases and nucleases. Mitochondria and endoplasmic reticulum (ER) play pivotal roles in the maintenance of intracellular Ca2+ homeostasis and regulation of cell death. Several lines of evidence have shown that, in the presence of some apoptotic stimuli, the activation of mitochondrial processes maylead to the release of cytochrome c followed by the activation of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Calcium; Apoptosis; Bax; Mitochondria; Endoplasmic reticulum; Neurodegeneration and aging.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000300011
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Cytoskeleton, endoplasmic reticulum and nucleus alterations in CHO-K1 cell line after Crotalus durissus terrificus (South American rattlesnake) venom treatment J. Venom. Anim. Toxins incl. Trop. Dis.
Tamieti,B. P.; Damatta,R. A.; Cogo,J. C.; Da Silva,N. S.; Mittmann,J.; Pacheco-Soares,C..
Snake venoms are toxic to a variety of cell types. However, the intracellular damages and the cell death fate induced by venom are unclear. In the present work, the action of the South American rattlesnake Crotalus durissus terrificus venom on CHO-K1 cell line was analyzed. The cells CHO-K1 were incubated with C. d. terrificus venom (10, 50 and 100g/ml) for 1 and 24 hours, and structural alterations of actin filaments, endoplasmic reticulum and nucleus were assessed using specific fluorescent probes and agarose gel electrophoresis for DNA fragmentation. Significant structural changes were observed in all analyzed structures. DNA fragmentation was detected suggesting that, at the concentrations used, the venom induced apoptosis.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cell culture; Actin filaments; Nucleus; Endoplasmic reticulum; Crotalus; Rattlesnake venom; Apoptosis.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992007000100004
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Endoplasmic reticulum calcium signaling in nerve cells Biol. Res.
VERKHRATSKY,ALEXEI.
The endoplasmic reticulum (ER) is an important organelle involved in various types of signaling in nerve cells. The ER serves as a dynamic Ca2+ pool being thus involved in rapid signaling events associated with cell stimulation by either electrical (action potential) or chemical (neurotransmitters) signals. This function is supported by Ca2+ release channels (InsP3 and ryanodine receptors) and SERCA Ca2+ pumps residing in the endomembrane. In addition the ER provides a specific environment for the posttranslational protein processing and transport of various molecules towards their final destination. In parallel, the ER acts as a "calcium tunnel," which facilitates Ca2+ movements within the cell by avoiding cytoplasmic routes. Finally the ER appears as a...
Tipo: Journal article Palavras-chave: Calcium signaling; Endoplasmic reticulum; Ryanodine receptors; InsP3 receptors.
Ano: 2004 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000400027
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Evaluation of the role of the Endoplasmic Reticulum-Golgi transit in the biogenesis of peroxisomal membrane proteins in wild type and peroxisome biogenesis mutant CHO cells Biol. Res.
TORO,ANDRÉS; ARREDONDO,CRISTIAN; CORDOVA,GONZALO; ARAYA,CLAUDIA; PALACIOS,JOSÉ L; VENEGAS,ALEJANDRO; MORITA,MASASHI; IMANAKA,TSUNEO; SANTOS,MANUEL J.
Peroxisomes are thought to be formed by division of pre-existing peroxisomes after the import of newly synthesized proteins. However, it has been recently suggested that the endoplasmic reticulum (ER) provides an alternative de novo mechanism for peroxisome biogenesis in some cells. To test a possible role of the ER-Golgi transit in peroxisome biogenesis in mammalian cells, we evaluated the biogenesis of three peroxisomal membrane proteins (PMPs): ALDRP (adrenoleukodystrophy related protein), PMP70 and Pex3p in CHO cells. We constructed chimeric genes encoding these PMPs and green fluorescent protein (GFP), and transiently transfected them to wild type and mutant CHO cells, in which normal peroxisomes were replaced by peroxisomal membrane ghosts. The...
Tipo: Journal article Palavras-chave: Adrenoleukodystrophy; ALDRP; Endoplasmic reticulum; Peroxisome biogenesis; Pex3p and PMP70.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000200014
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Interplay between ER Ca2+ uptake and release fluxes in neurons and its impact on [Ca2+] dynamics Biol. Res.
FRIEL,DAVID.
In neurons, depolarizing stimuli open voltage-gated Ca2+ channels, leading to Ca2+ entry and a rise in the cytoplasmic free Ca2+ concentration ([Ca2+]i). While such [Ca2+]i elevations are initiated by Ca2+ entry, they are also influenced by Ca2+ transporting organelles such as mitochondria and the endoplasmic reticulum (ER). This review summarizes contributions from the ER to depolarization-evoked [Ca2+]i responses in sympathetic neurons. As in other neurons, ER Ca2+ uptake depends on SERCAs, while passive Ca2+ release depends on ryanodine receptors (RyRs). RyRs are Ca2+ permeable channels that open in response to increases in [Ca2+]i, thereby permitting [Ca2+]i elevations to trigger Ca2+ release through Ca2+-induced Ca2+ release (CICR). However, whether...
Tipo: Journal article Palavras-chave: Dynamics; Sympathetic neurons; Endoplasmic reticulum; Ryanodine receptors.
Ano: 2004 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000400024
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Location matters: the endoplasmic reticulum and protein trafficking in dendrites Biol. Res.
Ramírez,Omar A; Härtel,Steffen; Couve,Andrés.
Neurons are highly polarized, but the trafficking mechanisms that operate in these cells and the topological organization of their secretory organelles are still poorly understood. Particularly incipient is our knowledge of the role of the neuronal endoplasmic reticulum. Here we review the current understanding of the endoplasmic reticulum in neurons, its structure, composition, dendritic distribution and dynamics. We also focus on the trafficking of proteins through the dendritic endoplasmic reticulum, emphasizing the relevance of transport, retention, assembly of multi-subunit protein complexes and export. We additionally discuss the roles of the dendritic endoplasmic reticulum in synaptic plasticity.
Tipo: Journal article Palavras-chave: Endoplasmic reticulum; Protein trafficking; Dendrites; Neuron.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602011000100003
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Modulation of store-operated Ca2+ entry by cyclic-ADP-ribose BJMBR
Thompson,M.; White,T.; Chini,E.N..
Store-operated Ca2+ entry plays an important role in Ca2+ homeostasis in cells but the mechanisms of control of these channels are not completely understood. We describe an investigation of the role of the CD38-cyclic-ADP-ribose (cADPR)-ryanodine-channel (RyR) signaling pathway in store-operated Ca2+ entry in human smooth muscle. We observed that human myometrial cells have a functional store-operated Ca2+ entry mechanism. Furthermore, we observed the presence of transient receptor potential 1, 3, 4, 5, and 6 ion channels in human myometrial cells. Store-operated Ca2+ transient was inhibited by at least 50-70% by several inhibitors of the RyR, including ryanodine (10 µM), dantrolene (10 µM), and ruthenium red (10 µM). Furthermore, the cell permeable...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cyclic-ADP-ribose; IP3; Endoplasmic reticulum; Ryanodine channel; Calcium entry; Human smooth muscle.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000600006
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Plant BiP gene family: differential expression, stress induction and protective role against physiological stresses Braz. J. Plant Physiol.
Carolino,Sonia Madali Boseja; Vaez,Juliana Rocha; Irsigler,André Southernman Teixeira; Valente,Maria Anete S.; Rodrigues,Leonardo Augusto Zebral; Fontes,Elizabeth Pacheco Batista.
In contrast to yeast or mammalian counterpart, BiP (Binding Protein) from several plant species, such as maize, tobacco, Arabidopsis and soybean, is encoded by a multigene family. A systematic characterization and analysis of soybean BiP expression have provided evidence for the existence of multiple, complex regulatory mechanisms controlling plant BiP gene expression. In support of this observation, the soybean BiP gene family has been shown to exhibit organ-specific expression and differential regulation in response to abiotic stresses through distinct signaling pathways. As a member of the stress-regulated HSP70 family of protein, the elucidation of plant BiP function and regulation is likely to lead do new strategies to enhance crop tolerance to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Endoplasmic reticulum; ER stressors; Grp78; Molecular chaperone; Unfolded protein response; Water stress.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202003000200001
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The physiological role of the unfolded protein response in plants Biol. Res.
Moreno,Adrian A; Orellana,Ariel.
Unfolded protein response (UPR) is a signaling mechanism activated by misfolded protein accumulation in the endoplasmic reticulum. It is a widespread process that has been described in organisms ranging from yeasts to mammals. In recent years, our understanding of UPR signaling pathway in plants has advanced. Two transcription factors from Arabidopsis thaliana have been reported to function as the sensor/ transducer of this response (AtbZIP60 and AtbZIP28). They seem to be involved in both heat and biotic stress. Furthermore, overexpression of one of them (AtbZIP60) produces plants with a higher tolerance for salt stress, suggesting that this transcription factor may play a role in abiotic stress. Furthermore, some data suggest that crosstalk between genes...
Tipo: Journal article Palavras-chave: Endoplasmic reticulum; Plant; Signaling; Unfolded protein response.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602011000100010
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The quality control of glycoprotein folding in the endoplasmic reticulum, a trip from trypanosomes to mammals BJMBR
Parodi,A.J..
The present review deals with the stages of synthesis and processing of asparagine-linked oligosaccharides occurring in the lumen of the endoplasmic reticulum and their relationship to the acquisition by glycoproteins of their proper tertiary structures. Special emphasis is placed on reactions taking place in trypanosomatid protozoa since their study has allowed the detection of the transient glucosylation of glycoproteins catalyzed by UDP-Glc:glycoprotein glucosyltransferase and glucosidase II. The former enzyme has the unique property of covalently tagging improperly folded conformations by catalyzing the formation of protein-linked Glc1Man7GlcNAc2, Glc1Man8GlcNac2 and Glc1Man9GlcNAc2 from the unglucosylated proteins. Glucosyltransferase is a soluble...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycoproteins; N-glycosylation; Folding; Endoplasmic reticulum; Glucosylation.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000500002
Registros recuperados: 10
Primeira ... 1 ... Última
 

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