ANA PAULA PEREIRA VELOSA
Índice h a partir de 2011
12
Projetos de Pesquisa
Unidades Organizacionais
LIM/17 - Laboratório de Investigação em Reumatologia, Hospital das Clínicas, Faculdade de Medicina
18 resultados
Resultados de Busca
Agora exibindo 1 - 10 de 18
conferenceObject COLLAGEN TYPE V FACILITATE THE DIFFERENTIATION OF RABBIT ADIPOSE TISSUE-DERIVED STEM CELLS INTO A CHONDROCYTE-LIKE PHENOTYPE ""IN VITRO""(2012) CRUZ, Isabele B.; GOLDENSTEIN-SCHAINBERG, C.; FULLER, R.; VELOSA, A. P.; CARRASCO, S.; CAPELOZZI, V.; YOSHINARI, N. H.; TEODORO, W. R.conferenceObject Collagen V Maintains Experimental Pulmonary Fibrosis In Il17-dependent And -Independent Pathways(2013) FABRO, A. T.; SILVA, P. Q.; ZOCOLARO, W. S.; ALMEIDA, M. S.; MINATEL, I. O.; PRANDO, E. C.; RAINHO, C. A.; VELOSA, A. P.; TEODORO, W. R.; PARRA-CUENTAS, E. R.; POPPER, H. H.; CAPELOZZI, V. L.- Modeling pulmonary fibrosis by abnormal expression of telomerase/apoptosis/collagen V in experimental usual interstitial pneumonia(2014) PARRA, E. R.; PINCELLI, M. S.; TEODORO, W. R.; VELOSA, A. P. P.; MARTINS, V.; RANGEL, M. P.; BARBAS-FILHO, J. V.; CAPELOZZI, V. L.Limitations on tissue proliferation capacity determined by telomerase/apoptosis balance have been implicated in pathogenesis of idiopathic pulmonary fibrosis. In addition, collagen V shows promise as an inductor of apoptosis. We evaluated the quantitative relationship between the telomerase/apoptosis index, collagen V synthesis, and epithelial/fibroblast replication in mice exposed to butylated hydroxytoluene (BHT) at high oxygen concentration. Two groups of mice were analyzed: 20 mice received BHT, and 10 control mice received corn oil. Telomerase expression, apoptosis, collagen I, III, and V fibers, and hydroxyproline were evaluated by immunohistochemistry, in situ detection of apoptosis, electron microscopy, immunofluorescence, and histomorphometry. Electron microscopy confirmed the presence of increased alveolar epithelial cells type 1 (AEC1) in apoptosis. Immunostaining showed increased nuclear expression of telomerase in AEC type 2 (AEC2) between normal and chronic scarring areas of usual interstitial pneumonia (UIP). Control lungs and normal areas from UIP lungs showed weak green birefringence of type I and III collagens in the alveolar wall and type V collagen in the basement membrane of alveolar capillaries. The increase in collagen V was greater than collagens I and III in scarring areas of UIP. A significant direct association was found between collagen V and AEC2 apoptosis. We concluded that telomerase, collagen V fiber density, and apoptosis evaluation in experimental UIP offers the potential to control reepithelization of alveolar septa and fibroblast proliferation. Strategies aimed at preventing high rates of collagen V synthesis, or local responses to high rates of cell apoptosis, may have a significant impact in pulmonary fibrosis.
conferenceObject PULMONARY FIBROSIS INDUCED BY BLEOMYCIN IS DRIVEN BY HIGH COLLAGEN V AND TGF-< BETA > SYNTHESIS(2014) MARTINS, V.; LOPES, D. B.; ANTUNES, M.; VELOSA, A. P. P.; TEODORO, W. R.; PARRA, E. R.; CAPELOZZI, V. L.- The effects of conjugated estrogen, raloxifene and soy extract on collagen in rat bones(2012) CONDI, F. L. F.; SOARES JR., J. M.; TEODORO, W. R.; VELOSO, A. P.; PARRA, E. R.; SIMOES, M. de Jesus; BARACAT, E. C.Objective To evaluate the action of conjugated equine estrogen, raloxifene and isolated or combined genistein-rich soy extracts on collagen fibers in the bones of oophorectomized rats. Materials and methods Seventy female rats received testosterone propionate (0.1 mu g/g) on the 9th day after birth. At 6 months of age, the rats were administered the vehicle (propylene glycol, 0.5 ml/day), and ten of the rats were randomly chosen to comprise the non-oophorectomized control group (GI). The other 60 rats were ovariectomized and randomized into six groups of ten as follows: GII, vehicle; GIII, conjugated equine estrogen (CEE), 50 mu g/kg/day; GIV, raloxifene (RAL), 0.75 mg/kg/day; GV, genistein-rich soy extract (GSE), 300 mg/kg/day; GVI, CEE + GSE, 50 mu g/kg/day + 300 mg/kg/day; and GVII, CEE + RAL, 50 mu g/kg/day + 0.75 mg/kg/day. Three months after surgery, the drugs were administered for 60 consecutive days. All rats were euthanized, and their left tibiae were removed for histological routine. The histological sections were stained with hematoxylin-eosin, and picrosirius for evaluating bone microarchitecture. Types I and II collagen fibers were analyzed by immunofluorescence. Data analysis was carried out with ANOVA and Tukey's test. Results Collagen reduction was significant in the GIII animals when compared to the other groups (p < 0.05). There was no significant difference in the thickness of collagen fibers among the groups. There was a greater quantity of type III collagen in GVI than in the other groups. Conclusion Our data indicate that conjugated equine estrogen improves bone quality because it increases the quantity of type I collagen while reducing the quantity of thin collagen fibers. In addition, the combination of CEE and raloxifene or genistein-rich soy extract is not as efficient as CEE itself to improve bone quality.
conferenceObject Fibrogenesis failure of type V collagen observed in pulmonary and cutaneous fibroblast culture reinforce the pathogenic participation of this collagen in the pathway of systemic sclerosis(2012) TEODORO, W. R.; MORAIS, J.; MARTIN, P.; VELOSA, A. P. P.; CARRASCO, S.; SOUZA, R. B. C.; KATAYAMA, M. L.; GOLDEINSTEIN-SCHAINBERG, C.; PARRA, E. R.; CAPELOZZI, V. L.; YOSHINARI, N. H.Introduction: Unusual type V collagen (COLV) accumulation was demonstrated in systemic sclerosis (SSc) by our group. In this regard, this study analyzed tridimensional reconstruction (3D), biochemical and molecular profile of COLVα1 and COLVα2 chains in pulmonary and cutaneous fibroblasts culture from patients with SSc. Materials and Methods: Pulmonary and cutaneous fibroblasts for culture were obtained from 7 patients with SSc and from six controls respectively. COLV 3D reconstruction was performed by confocal microscopy. COLVα1 and COLVα2 gene expression was performed by RT-PCR and COLV protein expression by immunoblotting. Results: COL V 3D reconstruction showed distorted and strongly thickened fibers with irregular bundles resulting in a dense network in lung and skin fibroblast cultures from SSc patients compared to the thin fibers from fibroblast controls. Collagen quantification showed significant increased COLV fiber expression in SSc cutaneous and pulmonary fibroblasts (P<0.01) compared with the respective controls. In the same way, molecular evaluation demonstrated an increased significance (P=0.05) of COLVα1 and COLVα2 mRNA expression in cutaneous and pulmonary fibroblasts from SSc patients to that of control groups. The immunoblotting analysis demonstrated the increased weight of the molecular COLV chains. Conclusion: COLV overexpression and an unusual organization of these fibers including molecular and biochemical changes, suggest an interference process of the COLV fibrillogenesis in patients with SSc, reinforcing the participation of this collagen in SSc pathogenesis and open new therapeutic perspectives for these patients.conferenceObject COLLAGEN V/C57BL6 MOUSE MODEL: A NOVEL PRECLINICAL MODEL TO STUDY PATHOPHYSIOLOGY AND THERAPEUTIC APPROACHES IN SYSTEMIC SCLEROSIS(2018) TEODORO, W. R.; VELOSA, A. P. P.; QUEIROZ, Z. A. de J.; SANTOS, L. A. dos; CATANOZI, S.; SANTOS FILHO, A. dos; BUENO, C.; VENDRAMINI, M.; FERNEZLIAN, S. M.; EHER, E. M.; LOPES, F. D. T. Q. S.; SAMPAIO-BARROS, P. D.; CAPELOZZI, V. L.conferenceObject INFLUENCE OF ALPHA 2 DO COLLAGEN V OVEREXPRESSION IN PHYSIOPHATOLOGY OF FIBROSIS SYSTEMIC SCLEROSIS PATIENTS(2014) MORAIS, J.; MARTIN, P.; VELOSA, A. P. P.; ANDRADE, P. C.; CRUZ, I. B.; MIRACCA, E. C.; FAC, F. A. C. Barrence; CARRASCO, S.; GOLDEINSTEIN-SCHAINBERG, C.; NAGAI, M. A.; PARRA, E. R.; CAPELOZZI, V. L.; TEODORO, W. R.- Effect of topical clay application on the synthesis of collagen in skin: an experimental study(2012) VALENTI, D. M. Z.; SILVA, J.; TEODORO, W. R.; VELOSA, A. P.; MELLO, S. B. V.Background. Clay is often used in cosmetic treatments, although little is known about its action. Aim. To evaluate the effect of topical clay application on the histoarchitecture of collagen fibres in rat skin. Methods. Animals received a daily application of clay and retinoic acid (RA) 0.025% to the dorsal skin over 7 and 14 days, under vaporization at 37 degrees C for 40 min. Control skin was not vaporized. Samples from each region were excised, and stained with picrosirius red for collagen evaluation. Results. Seven days after clay treatment, an increase in the number of collagen fibres was observed in treated skin compared with control skin (51.74 +/- 1.28 vs. 43.39 +/- 1.79%, respectively, P < 0.01), whereas RA did not alter the collagen level (45.66 +/- 1.10%). Clay application over 14 days did not induce a further increase in skin collagen, whereas treatment with RA did (58.07 +/- 1.59%; P = 0.001 vs. control). Conclusion. Clay application promotes an increase in the number of collagen fibres, which may account for its beneficial effects.
conferenceObject DYNAMIC COLLAGEN V REMODELING IS RELATED TO SKIN THICKENING IN SSc(2012) MARTIN, P.; TEODORO, W. R.; VELOSA, A. P.; CARRASCO, S.; MORAIS, J. de; CHRISTMANN, R. B.; PARRAS, E. R.; CAPELOZZI, V. L.; YOSHINARI, N. H.Background. Normal physiological properties of skin, one of the primary organs affected in SSc, depends on collagen Types I (COL I), III (COLIII) and V (COLV) assembly forming heterotypic fibres. COLV regulates fibril diameter and loss of this function could result in tissue fibrosis. In this way, our aim was to evaluate the histological and molecular profiles of COLI, COLIII and COLV in SSc skin and its correlation with skin thickening and disease activity. Methods. Skin biopsies of 18 patients (5 at early and 13 at late disease stage) and 10 healthy controls were studied. Assessment of skin thickening was performed using the modified Rodnan skin score (MRSS) and disease activity was calculated by Valentini Disease Activity Index. Quantification of COLI, COLIII and COLV was evaluated by histomorphometry in dermis and quantitative RT–PCR in dermal fibroblast culture. Results. A higher expression of abnormal COLV was observed in dermis of patients with early disease when compared with control group and late disease. The COLIII content was also higher in early SSc when compared with healthy controls and late SSc. On the other hand, the amount of COLI was higher in late disease when compared with control and early SSc. A positive correlation between COLV and MRSS (r = 0.42, P = 0.04) as well as disease activity (r = 0.45, P = 0.03) was observed, but there was no correlation between COLI and COLIII expression and these parameters. COLV α-1 and COLV α-2, as well as COLI α-1 and COLIII α-1 mRNA expression were higher in SSc when compared with control group. Conclusion. We found increased COLIII and COLV deposition in early SSc and increased COLI expression in late SSc indicating that collagen remodelling in SSc is a dynamic process. The fact that abnormal COLV expression decreases in later disease stages could explain why skin thickening sometimes improves spontaneously with time. Besides, COLV is correlated to MRSS and disease activity. These findings include COLV as an important regulator of cutaneous thickness in SSc and may add this protein as a new target for future treatments.