FRANCISCO RAFAEL MARTINS LAURINDO
Projetos de Pesquisa
Unidades Organizacionais
Instituto do Coração, Hospital das Clínicas, Faculdade de Medicina
LIM/64, Hospital das Clínicas, Faculdade de Medicina - Líder
LIM/64, Hospital das Clínicas, Faculdade de Medicina - Líder
53 resultados
Resultados de Busca
Agora exibindo 1 - 10 de 53
- Golgi-independent routes support protein disulfide isomerase externalization in vascular smooth muscle cells(2017) ARAUJO, Thais L. S.; FERNANDES, Carolina G.; LAURINDO, Francisco R. M.Extracellular pools of intracellular molecular chaperones are increasingly evident. The peri/epicellular(pec) pool of the endoplasmic reticulum redox chaperone protein disulfide isomerase-A1(PDI) is involved in thrombosis and vascular remodeling, while PDI externalization routes remain elusive. In endothelial cells, vesicular-type PDI secretion involves classical and unconventional pathways, while in platelets PDI exocytosis involves actin cytoskeleton. However, little is known about pecPDI in vascular smooth muscle cells(VSMC). Here, we showed that VSMC display a robust cell-surface(cs) PDI pool, which binds to cs independently of electrostatic forces. However, contrarily to other cells, soluble secreted PDI pool was undetectable in VSMC. Calcium ionophore A23187 and TNF alpha enhanced VSMC csPDI. Furthermore, VSMC PDI externalization occurred via Golgi-bypass unconventional route, which was independent of cytoskeleton or lysosomes. Secreted PDI was absent in ex vivo wild-type mice aortas but markedly enhanced in PDI-overexpressing mice. Such characterization of VSMC pecPDI reinforces cell-type and context specific routes of PDI externalization.
- EXTRACELLULAR VESICLES AS PARACRINE REDOX REGULATORS OF THROMBOSIS AND HAEMOSTASIS(2023) GASPAR, Renato S.; LAURINDO, Francisco R. M.
- Conserved Gene Microsynteny Unveils Functional Interaction Between Protein Disulfide Isomerase and Rho Guanine-Dissociation Inhibitor Families(2017) MORETTI, Ana I. S.; PAVANELLI, Jessyca C.; NOLASCO, Patricia; LEISEGANG, Matthias S.; TANAKA, Leonardo Y.; FERNANDES, Carolina G.; WOSNIAK JR., Joao; KAJIHARA, Daniela; DIAS, Matheus H.; FERNANDES, Denise C.; JO, Hanjoong; Ngoc-Vinh Tran; EBERSBERGER, Ingo; BRANDES, Ralf P.; BONATTO, Diego; LAURINDO, Francisco R. M.Protein disulfide isomerases (PDIs) support endoplasmic reticulum redox protein folding and cell-surface thiol-redox control of thrombosis and vascular remodeling. The family prototype PDIA1 regulates NADPH oxidase signaling and cytoskeleton organization, however the related underlying mechanisms are unclear. Here we show that genes encoding human PDIA1 and its two paralogs PDIA8 and PDIA2 are each flanked by genes encoding Rho guanine-dissociation inhibitors (GDI), known regulators of RhoGTPases/cytoskeleton. Evolutionary histories of these three microsyntenic regions reveal their emergence by two successive duplication events of a primordial gene pair in the last common vertebrate ancestor. The arrangement, however, is substantially older, detectable in echinoderms, nematodes, and cnidarians. Thus, PDI/RhoGDI pairing in the same transcription orientation emerged early in animal evolution and has been largely maintained. PDI/RhoGDI pairs are embedded into conserved genomic regions displaying common cis-regulatory elements. Analysis of gene expression datasets supports evidence for PDI/RhoGDI coexpression in developmental/inflammatory contexts. PDIA1/RhoGDIa were co-induced in endothelial cells upon CRISP-R-promoted transcription activation of each pair component, and also in mouse arterial intima during flow-induced remodeling. We provide evidence for physical interaction between both proteins. These data support strong functional links between PDI and RhoGDI families, which likely maintained PDI/RhoGDI microsynteny along > 800-million years of evolution.
- Identification of Novel Interaction between ADAM17 (a Disintegrin and Metalloprotease 17) and Thioredoxin-1(2012) ARAGAO, Annelize Z. B.; NOGUEIRA, Maria Luiza C.; GRANATO, Daniela C.; SIMABUCO, Fernando M.; HONORATO, Rodrigo V.; HOFFMAN, Zaira; YOKOO, Sami; LAURINDO, Francisco R. M.; SQUINA, Fabio M.; ZERI, Ana Carolina M.; OLIVEIRA, Paulo S. L.; SHERMAN, Nicholas E.; LEME, Adriana F. PaesADAM17, which is also known as TNF alpha-converting enzyme, is the major sheddase for the EGF receptor ligands and is considered to be one of the main proteases responsible for the ectodomain shedding of surface proteins. How a membrane-anchored proteinase with an extracellular catalytic domain can be activated by inside-out regulation is not completely understood. We characterized thioredoxin-1 (Trx-1) as a partner of the ADAM17 cytoplasmic domain that could be involved in the regulation of ADAM17 activity. We induced the overexpression of the ADAM17 cytoplasmic domain in HEK293 cells, and ligands able to bind this domain were identified by MS after protein immunoprecipitation. Trx-1 was also validated as a ligand of the ADAM17 cytoplasmic domain and full-length ADAM17 recombinant proteins by immunoblotting, immunolocalization, and solid phase binding assay. In addition, using nuclear magnetic resonance, it was shown in vitro that the titration of the ADAM17 cytoplasmic domain promotes changes in the conformation of Trx-1. The MS analysis of the cross-linked complexes showed cross-linking between the two proteins by lysine residues. To further evaluate the functional role of Trx-1, we used a heparin-binding EGF shedding cell model and observed that the overexpression of Trx-1 in HEK293 cells could decrease the activity of ADAM17, activated by either phorbol 12-myristate 13-acetate or EGF. This study identifies Trx-1 as a novel interaction partner of the ADAM17 cytoplasmic domain and suggests that Trx-1 is a potential candidate that could be involved in ADAM17 activity regulation.
conferenceObject Calorie Restriction Increases Cerebral Mitochondrial Respiratory Capacity in a NO center dot-Mediated Mechanism: Impact on Neuronal Survival(2013) CERQUEIRA, Fernanda M.; CUNHA, Fernanda M.; LAURINDO, Francisco R. M.; KOWALTOWSKI, Alicia J.Calorie restriction (CR) enhances animal lifespan and prevents age-related diseases, including neurological decline. Recent evidence suggests a mechanism involved in CR-induced lifespan extension is NO•-stimulated mitochondrial biogenesis. We examine here the effects of CR on brain mitochondrial content. CR increased eNOS and nNOS and the content of mitochondrial proteins (cytochrome c oxidase, citrate synthase and mitofusin) in the brain. Furthermore, we established an in vitro system to study the neurological effects of CR using serum extracted from animals on this diet. In cultured neurons, CR serum enhanced nNOS expression and increased nitrite levels (a NO• product). CR serum also enhanced the levels of cytochrome c oxidase and increased citrate synthase activity and respiratory rates in neurons. CR serum effects were inhibited by L-NAME and mimicked by the NO• donor SNAP. Furthermore, both CR sera and SNAP were capable of improving neuronal survival. Overall, our results indicate that CR increases mitochondrial biogenesis in a NO•-mediated manner, resulting in enhanced reserve respiratory capacity and improved survival in neurons.- Oxidation, inactivation and aggregation of protein disulfide isomerase promoted by the bicarbonate-dependent peroxidase activity of human superoxide dismutase(2014) IQBAL, Asif; PAVIANI, Veronica; MORETTI, Ana Iochabel; LAURINDO, Francisco R. M.; AUGUSTO, OharaProtein disulfide isomerase (PDI) is a dithiol-disulfide oxidoreductase that has essential roles in redox protein folding. PDI has been associated with protective roles against protein aggregation, a hallmark of neurodegenerative diseases. Intriguingly, PDI has been detected in the protein inclusions found in the central nervous system of patients of neurodegenerative diseases. Oxidized proteins are also consistently detected in such patients, but the agents that promote these oxidations remain undefined. A potential trigger of protein oxidation is the bicarbonate-dependent peroxidase activity of the human enzyme superoxide dismutase 1 (hSOD1). Therefore, we examined the effects of this activity on PDI structure and activity. The results showed that PDI was oxidized to radicals that lead to PDI inactivation and aggregation. The aggregates are huge and apparently produced by covalent cross-links. Spin trapping experiments coupled with MS analysis indicated that at least 3 residues of PDI are oxidized to tyrosyl radicals (Y-63, Y-116 and Y-327) Parallel experiments showed that PDI is also oxidized to radicals, inactivated and aggregated by the action of photolytically generated carbonate radical and by UV light. PDI is prone to inactivation and aggregation by one-electron oxidants and UV light probably because of its high content of aromatic amino acids.
- Serum from Calorie-Restricted Rats Activates Vascular Cell eNOS through Enhanced Insulin Signaling Mediated by Adiponectin(2012) CERQUEIRA, Fernanda M.; BRANDIZZI, Laura I.; CUNHA, Fernanda M.; LAURINDO, Francisco R. M.; KOWALTOWSKI, Alicia J.eNOS activation resulting in mitochondrial biogenesis is believed to play a central role in life span extension promoted by calorie restriction (CR). We investigated the mechanism of this activation by treating vascular cells with serum from CR rats and found increased Akt and eNOS phosphorylation, in addition to enhanced nitrite release. Inhibiting Akt phosphorylation or immunoprecipitating adiponectin (found in high quantities in CR serum) completely prevented the increment in nitrite release and eNOS activation. Overall, we demonstrate that adiponectin in the serum from CR animals increases NO center dot signaling by activating the insulin pathway. These results suggest this hormone may be a determinant regulator of the beneficial effects of CR.
- Calorie restriction increases cerebral mitochondrial respiratory capacity in a NO center dot-mediated mechanism: Impact on neuronal survival(2012) CERQUEIRA, Fernanda M.; CUNHA, Fernanda M.; LAURINDO, Francisco R. M.; KOWALTOWSKI, Alicia J.Calorie restriction (CR) enhances animal life span and prevents age-related diseases, including neurological decline. Recent evidence suggests that a mechanism involved in CR-induced life-span extension is NO-stimulated mitochondrial biogenesis. We examine here the effects of CR on brain mitochondrial content. CR increased eNOS and nNOS and the content of mitochondria] proteins (cytochrome c oxidase, citrate synthase, and mitofusin) in the brain. Furthermore, we established an in vitro system to study the neurological effects of CR using serum extracted from animals on this diet. In cultured neurons, CR serum enhanced nNOS expression and increased levels of nitrite (a NO product). CR serum also enhanced the levels of cytochrome c oxidase and increased citrate synthase activity and respiratory rates in neurons. CR serum effects were inhibited by L-NAME and mimicked by the NO donor SNAP. Furthermore, both CR sera and SNAP were capable of improving neuronal survival. Overall, our results indicate that CR increases mitochondrial biogenesis in a NO-mediated manner, resulting in enhanced reserve respiratory capacity and improved survival in neurons.
- A Secreted Phospholipase A(2) Induces Formation of Smooth Muscle Foam Cells Which Transdifferentiate to Macrophage-Like State(2019) GIANNOTTI, Karina Cristina; WEINERT, Soenke; VIANA, Mariana Nascimento; LEIGUEZ, Elbio; ARAUJO, Thais L. S.; LAURINDO, Francisco R. M.; LOMONTE, Bruno; BRAUN-DULLAEUS, Ruediger; TEIXEIRA, CatarinaVascular smooth muscle cells (VSMCs) loaded with lipid droplets (LDs) are markers of atherosclerosis. In this disease, inflammatory Group IIA-secreted phospholipase A(2)s (GIIA sPLA(2)s) are highly expressed in VSMCs, but their actions in these cells are unknown. Here, we investigated the ability of myotoxin III (MT-III), an ophidian GIIA sPLA(2) sharing structural and functional features with mammalian GIIA sPLA(2)s, to induce LD formation and lipid metabolism factors involved in this effect. Modulation of VSMC phenotypes by this sPLA(2) was also evaluated. Incubation of VSMCs with MT-III significantly increased the number of LDs. MT-III upregulated scavenger receptor type 1 (SR-A1) and lectin-like oxidized low-density lipoprotein receptor-1 (LOX-1) protein expression and enhanced acetylated-low density lipoprotein (acLDL) uptake by VSMCs, revealing the ability of a GIIA PLA(2) to modulate scavenger receptor activities. MT-III induced translocation and protein expression of PPAR-gamma and -beta/delta. Inhibition of peroxisome proliferator-activated receptors (PPARs) and diacylglycerol O-acyltransferase (DGAT) and acyl-CoA:cholesterolacyltransferase (ACAT) enzymes abrogated MT-III-induced LD formation. Moreover, in response to MT-III, VSMCs acquired phagocytic activity and expressed macrophage markers CD68 and MAC-2. In conclusion, MT-III is able to stimulate VSMCs and recruit factors involved in lipid uptake and metabolism, leading to the formation of VSMC-derived foam cells with acquisition of macrophage-like markers and functions.
article 36 Citação(ões) na Scopus Tobacco Smoke Induces Ventricular Remodeling Associated with an Increase in NADPH Oxidase Activity(2011) RAFACHO, Bruna P. M.; AZEVEDO, Paula S.; POLEGATO, Bertha F.; FERNANDES, Ana A. H.; BERTOLINE, Maria A.; FERNANDES, Denise C.; CHIUSO-MINICUCCI, Fernanda; ROSCANI, Meliza G.; SANTOS, Priscila P. dos; MATSUBARA, Luiz S.; MATSUBARA, Beatriz B.; LAURINDO, Francisco R. M.; PAIVA, Sergio A. R.; ZORNOFF, Leonardo A. M.; MINICUCCI, Marcos F.Background: Recent studies have assessed the direct effects of smoking on cardiac remodeling and function. However, the mechanisms of these alterations remain unknown. The aim of this study was to investigate de role of cardiac NADPH oxidase and antioxidant enzyme system on ventricular remodeling induced by tobacco smoke. Methods: Male Wistar rats that weighed 200-230 g were divided into a control group (C) and an experimental group that was exposed to tobacco smoke for a period of two months (ETS). After the two-month exposure period, morphological, biochemical and functional analyses were performed. Results: The myocyte cross-sectional area and left ventricle end-diastolic dimension was increased 16.2% and 33.7%, respectively, in the ETS group. The interstitial collagen volume fraction was also higher in ETS group compared to the controls. In addition to these morphological changes, the ejection fraction and fractional shortening were decreased in the ETS group. Importantly, these alterations were related to augmented heart oxidative stress, which was characterized by an increase in NADPH oxidase activity, increased levels of lipid hydroperoxide and depletion of antioxidant enzymes (e.g., catalase, superoxide dismutase and glutathione peroxidase). In addition, cardiac levels of IFN-gamma, TNF-alpha and IL-10 were not different between the groups. Conclusion: Cardiac alterations that are induced by smoking are associated with increased NADPH oxidase activity, suggesting that this pathway plays a role in the ventricular remodeling induced by exposure to tobacco smoke.