Time filter

Source Type

Mexico City, Mexico

Cerecedo D.,Laboratorio Of Hematobiologia | Cisneros B.,CINVESTAV | Mondragon R.,CINVESTAV | Gonzalez S.,CINVESTAV | Galvan I.J.,CINVESTAV
British Journal of Haematology

Upon activation with physiological stimuli, human platelets undergo morphological changes, centralizing their organelles and secreting effector molecules at the site of vascular injury. Previous studies have indicated that the actin filaments and microtubules of suspension-activated platelets play a critical role in granule movement and exocytosis; however, the participation of these cytoskeleton elements in adhered platelets remains unexplored. α- and β-dystrobrevin members of the dystrophin-associated protein complex in muscle and non-muscle cells have been described as motor protein receptors that might participate in the transport of cellular components in neurons. Recently, we characterized the expression of dystrobrevins in platelets; however, their functional diversity within this cellular model had not been elucidated. The present study examined the contribution of actin filaments and microtubules in granule trafficking during the platelet adhesion process using cytoskeleton-disrupting drugs, quantification of soluble P-selectin, fluorescence resonance transfer energy analysis and immunoprecipitation assays. Likewise, we assessed the interaction of α-dystrobrevins with the ubiquitous kinesin heavy chain. Our results strongly suggest that microtubules and actin filaments participate in the transport of alpha and dense granules in the platelet adhesion process, during which α-dystrobrevins play the role of regulatory and adaptor proteins that govern trafficking events. © 2010 Blackwell Publishing Ltd. Source

Martinez-Zarate A.D.,Laboratorio Of Hematobiologia | Martinez-Vieyra I.,Laboratorio Of Hematobiologia | Alonso-Rangel L.,Laboratorio Of Hematobiologia | Cisneros B.,CINVESTAV | And 2 more authors.
Biochemical and Biophysical Research Communications

Dystroglycan has recently been characterized in blood tissue cells, as part of the dystrophin glycoprotein complex but to date nothing is known of its role in the differentiation process of neutrophils. We have investigated the role of dystroglycan in the human promyelocytic leukemic cell line HL-60 differentiated to neutrophils. Depletion of dystroglycan by RNAi resulted in altered morphology and reduced properties of differentiated HL-60 cells, including chemotaxis, respiratory burst, phagocytic activities and expression of markers of differentiation. These findings strongly implicate dystroglycan as a key membrane adhesion protein involved in the differentiation process in HL-60 cells. © 2014 Elsevier Inc. All rights reserved. Source

Mata-rocha M.,Instituto Mexicano del Seguro Social IMSS | Mata-rocha M.,CINVESTAV | Alvarado-cuevas E.,Instituto Mexicano del Seguro Social IMSS | Alvarado-cuevas E.,Laboratorio Of Hematobiologia | And 6 more authors.
Molecular Human Reproduction

CatSper channels are essential for hyperactivity of sperm flagellum, progesterone-mediated chemotaxis and oocyte fertilization. Catsper genes are exclusively expressed in the testis during spermatogenesis, but the function and regulation of the corresponding promoter regions are unknown. Here, we report the cloning and characterization of the promoter regions in the human and murine Catsper1 genes. These promoter regions were identified and isolated from genomic DNA, and transcriptional activities were tested in vitro after transfection into human embryonic kidney 293, mouse Sertoli cells 1 and GC-1spg cell lines as well as by injecting plasmids directly into mouse testes. Although the human and murine Catsper1 promoters lacked a TATA box, a well-conserved CRE site was identified. Both sequences may be considered as TATAless promoters because their transcriptional activity was not affected after deletion of TATA box-like sites. Several transcription initiation sites were revealed by RNA ligase-mediated rapid amplification of the cDNA 5'-ends. We also found that the immediate upstream region and the first exon in the human CATSPER1 gene negatively regulate transcriptional activity. In the murine Catsper1 promoter, binding sites for transcription factors SRY, SOX9 and CREB were protected by the presence of nuclear testis proteins in DNAse degradation assays. Likewise, the mouse Catsper1 promoter exhibited transcriptional activity in both orientations and displayed significant expression levels in mouse testis in vivo, whereas the suppression of transcription signals in the promoter resulted in low expression levels. This study, thus, represents the first identification of the transcriptional control regions in the genes encoding the human and murine CatSper channels. © The Author 2013. Published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology. All rights reserved. Source

Discover hidden collaborations