ARIEL BARRETO NOGUEIRA
Projetos de Pesquisa
Unidades Organizacionais
Instituto de Radiologia, Hospital das Clínicas, Faculdade de Medicina - Médico
9 resultados
Resultados de Busca
Agora exibindo 1 - 9 de 9
- A difficult case of angioimmunoblastic T-cell lymphoma to diagnose(2016) SACHSIDA-COLOMBO, Elisabetta; MARIANO, Livia Caroline Barbosa; BASTOS, Fernanda Queiróz; RASSI, Amanda Bruder; LAGE, Luís Alberto de Pádua Covas; BARRETO, Ariel; SIQUEIRA, Sheila; PEREIRA, Juliana
- Hypothesis on the Role of Cryptochromes in Inflammation and Subarachnoid Hemorrhage Outcome(2017) NOGUEIRA, Adriano Barreto; NOGUEIRA, Ariel Barreto; VEIGA, Jose Carlos Esteves; TEIXEIRA, Manoel JacobsenWe have recently found that the temperature variability (TV) in the day-night cycle may predict the mean intracranial pressure in the following 24 h (ICP24) in subarachnoid hemorrhage (SAH) patients under multimodality monitoring, sedation, and hypothermia (<35 degrees C). Specifically, we found that ICP24 = 6 (4-TV) mmHg. TV is the ratio between the coefficient of variation of temperature during the nocturnal and the preceding diurnal periods. This result suggests that the circadian clock reflects brain plasticity mechanisms and its malfunctioning leads to deterioration of the neurologic status. The sleep-wake cycle is absent in these patients and their circadian clock can function properly only by environment light-independent mechanisms. One mechanism involves the circadian clock proteins named cryptochromes (CRYs). CRYs are highly preserved and widespread in the evolutionary tree, are expressed in different cell types in humans [type II CRYs, in two forms: human cryptochrome 1 and 2 (hCRY1 and hCRY2)], and in certain species, respond to blue light and play role in magnetoreception. Interestingly, SAH outcome seems to correlate with inflammation, and CRYs decrease inflammatory activity. Our hypothesis derived from these observations is that CRYs modulate the circadian oscillation of temperature even during therapeutic hypothermia and improve outcome in SAH through decrease in inflammation. A strategy to test this hypothesis is to measure periodically during the acute phase of high-grade SAH the level of CRYs in cerebrospinal fluid (CSF) and circulating white blood cells, and to correlate these levels with outcome, TV, ICP24, and pro-and anti-inflammatory markers in CSF and blood. If this hypothesis is true, the development of therapies targeting inflammation in SAH could take advantage of cryptochrome properties. It has been shown that blue light phototherapy increases the expression of CRYs in blood mononuclear cells in jaundiced neonates. Likewise, visual stimulus with flashing light improves Alzheimer's disease features in experimental model and there is a prominent expression of CRYs in the retina. Remarkably, recent evidence showed that hCRY2 responds to electromagnetic fields, which could be one elusive mechanism of action of transcranial magnetic stimulation and a reason for its use in SAH.
- Hepatocellular carcinoma may display elevated nestin expression in endothelial cells: experimental study(2015) NOGUEIRA, Adriano Barreto; NOGUEIRA, Ariel Barreto; COSTA, Anderson Lino; LIMA, Fabiana Roberto; SIQUEIRA, Sheila Aparecida; TEIXEIRA, Manoel JacobsenCONTEXT AND OBJECTIVE: Nestin, a class VI intermediate filament protein, is highly expressed in the portal mesenchyme and sinusoidal endothelium of the human fetal liver, but scarcely expressed in adult portal vessel endothelium. During experimental liver regeneration, an increased number of nestin-positive parenchymal cells have been observed in the zone adjacent to the Hering canals. These parenchymal cells are regarded as hepatic stem cells or hepatoblasts, which may be involved in hepatocellular carcinogenesis. In the light of recent reports describing nestin-positive parenchymal cells in hepatocellular carcinoma, we aimed to use this tumor type as a positive control for immunohistochemical detection of nestin. DESIGN AND SETTING: Experimental study conducted at a university hospital. METHODS: Hepatocellular carcinoma sections from one case were analyzed for nestin expression by immunohistochemistry using confocal microscopy. RESULTS: Surprisingly, a conspicuous pattern resembling liver sinusoid-like cytoarchitecture was observed upon nestin staining of endothelial cells. CONCLUSIONS: This pattern has not been previously described. The preliminary results shown here suggest that nestin-positive endothelial cells are located in niches of immature or proliferative cells. Moreover, nestin expression in endothelial cells of hepatocellular carcinoma enhances the role of angiogenesis in this tumor type, although the prevalence of this immunohistopathological pattern remains to be determined. Finally, hepatocellular carcinoma is an effective positive control for nestin staining in fluorescent immunohistochemistry.
- Unilateral Eyelid Mass as an Unusual Presentation of Ocular Adnexal IgG4-Related Inflammation(2013) FONSECA, Fabricio L. da; RAMOS, Renata de Iracema Pulcheri; LIMA, Patricia P. de; NOGUEIRA, Ariel B.; MATAYOSHI, SuzanaPurpose: IgG4-related sclerosing disease is a new clinicopathologic systemic entity, which can involve ocular adnexal structures, such as lacrimal glands and orbital tissues. However, this entity seems to display a more diffuse, frequently bilateral, pattern in such cases. Conjunctival involvement has not been reported in this disease. Methods: We report the case of a 67-year-old woman with left upper palpebral mass for 5 months. A biopsy was performed, and the patient underwent systemic evaluation for IgG4-related disease. Results: The clinicopathologic study revealed intense lymphoplasmacytic and sclerosing inflammation, with IgG4-positive plasma cells and an IgG4: IgG ratio >40%. The conjunctiva was also involved, which was different from previous studies. The only abnormality was hyperglycemia at 180 mg/dL (reference range, 70-99 mg/dL) and a raised glycosylated hemoglobin at 7.8%. Serum IgG and IgG4 levels were normal. Conclusions: Our case presented an unusual framework of ocular adnexal IgG4-related inflammation, with a more benign and restricted palpebral manifestation involving the conjunctiva.
- Human Hippocampal Neurogenesis Drops Sharply in Children to Undetectable Levels in Adults(2018) NOGUEIRA, Adriano Barreto; NOGUEIRA, Ariel Barreto; VEIGA, Jose Carlos Esteves; TEIXEIRA, Manoel Jacobsen
- Results of surgical treatment of massive localized lymphedema in severely obese patients(2014) CINTRA JÚNIOR, Wilson; MODOLIN, Miguel Luiz Antonio; ROCHA, Rodrigo Itocazo; FERNANDES, Thadeu Rangel; NOGUEIRA, Ariel Barreto; GEMPERLI, RolfOBJECTIVE: to evaluate the importance of treatment of deformities caused by massive localized lymphedema (MLL) in the severely obese. METHODS: in a period of seven years, nine patients with morbid obesity and a mean age of 33 years underwent surgical resection of massive localized lymphedema with primary synthesis. This is a retrospective study on the surgical technique, complication rates and improved quality of life. RESULTS: all patients reported significant improvement after surgery, with greater range of motion, ambulation with ease and more effective hygiene. Histological analysis demonstrated the existence of a chronic inflammatory process marked by lymphomonocitary infiltrate and severe tissue edema. We observed foci of necrosis, formation of microabscesses, points of suppuration and local fibrosis organization, and pachydermia. The lymphatic vessels and some blood capillaries were increased, depicting a framework of linfangiectasias. CONCLUSION: surgical treatment of MLL proved to be important for improving patients' quality of life, functionally rehabilitating them and optimizing multidisciplinary follow-up of morbid obesity, with satisfactory surgical results and acceptable complication rates, demonstrating the importance of treatment and awareness about the disease.
- Multimodality Monitoring, Inflammation, and Neuroregeneration in Subarachnoid Hemorrhage(2014) NOGUEIRA, Adriano B.; NOGUEIRA, Ariel B.; VEIGA, Jose C. Esteves; TEIXEIRA, Manoel J.BACKGROUND: Stroke, including subarachnoid hemorrhage (SAH), is one of the leading causes of morbidity and mortality worldwide. The mortality rate of poor-grade SAH ranges from 34% to 52%. In an attempt to improve SAH outcomes, clinical research on multimodality monitoring has been performed, as has basic science research on inflammation and neuroregeneration (which can occur due to injury-induced neurogenesis). Nevertheless, the current literature does not focus on the integrated study of these fields. Multimodality monitoring corresponds to physiological data obtained during clinical management by both noninvasive and invasive methods. Regarding inflammation and neuroregeneration, evidence suggests that, in all types of stroke, a proinflammatory phase and an anti-inflammatory phase occur consecutively; these phases affect neurogenesis, which is also influenced by other pathophysiological features of stroke, such as ischemia, seizures, and spreading depression. OBJECTIVE: To assess whether injury-induced neurogenesis is a prognostic factor in poor-grade SAH that can be monitored and modulated. METHODS: We propose a protocol for multimodality monitoring-guided hypothermia in poor-grade SAH in which cellular and molecular markers of inflammation and neuroregeneration can be monitored in parallel with clinical and multimodal data. EXPECTED OUTCOMES: This study may reveal correlations between markers of inflammation and neurogenesis in blood and cerebrospinal fluid, based on clinical and multimodality monitoring parameters. DISCUSSION: This protocol has the potential to lead to new therapies for acute, diffuse, and severe brain diseases.
- Letter: Extensive Migration of Young Neurons Into the Infant Human Frontal Lobe(2017) NOGUEIRA, Adriano Barreto; NOGUEIRA, Ariel Barreto; VEIGA, Jose Carlos Esteves; TEIXEIRA, Manoel Jacobsen
- Existence of a potential neurogenic system in the adult human brain(2014) NOGUEIRA, Adriano Barreto; SOGAYAR, Mari Cleide; COLQUHOUN, Alison; SIQUEIRA, Sheila Aparecida; NOGUEIRA, Ariel Barreto; MARCHIORI, Paulo Euripedes; TEIXEIRA, Manoel JacobsenBackground: Prevailingly, adult mammalian neurogenesis is thought to occur in discrete, separate locations known as neurogenic niches that are best characterized in the subgranular zone (SGZ) of the dentate gyrus and in the subventricular zone (SVZ). The existence of adult human neurogenic niches is controversial. Methods: The existence of neurogenic niches was investigated with neurogenesis marker immunostaining in histologically normal human brains obtained from autopsies. Twenty-eight adult temporal lobes, specimens from limbic structures and the hypothalamus of one newborn and one adult were examined. Results: The neural stem cell marker nestin stained circumventricular organ cells and the immature neuronal marker doublecortin (DCX) stained hypothalamic and limbic structures adjacent to circumventricular organs; both markers stained a continuous structure running from the hypothalamus to the hippocampus. The cell proliferation marker Ki-67 was detected predominately in structures that form the septo-hypothalamic continuum. Nestin-expressing cells were located in the fimbria-fornix at the insertion of the choroid plexus; ependymal cells in this structure expressed the putative neural stem cell marker CD133. From the choroidal fissure in the temporal lobe, a nestin-positive cell layer spread throughout the SVZ and subpial zone. In the subpial zone, a branch of this layer reached the hippocampal sulcus and ended in the SGZ (principally in the newborn) and in the subiculum (principally in the adults). Another branch of the nestin-positive cell layer in the subpial zone returned to the optic chiasm. DCX staining was detected in the periventricular and middle hypothalamus and more densely from the mammillary body to the subiculum through the fimbria-fornix, thus running through the principal neuronal pathway from the hippocampus to the hypothalamus. The column of the fornix forms part of this pathway and appears to coincide with the zone previously identified as the human rostral migratory stream. Partial co-labeling with DCX and the neuronal marker beta III-tubulin was also observed. Conclusions: Collectively, these findings suggest the existence of an adult human neurogenic system that rises from the circumventricular organs and follows, at minimum, the circuitry of the hypothalamus and limbic system.