ANA MARIA DE MENDONCA COELHO
Projetos de Pesquisa
Unidades Organizacionais
LIM/37 - Laboratório de Transplante e Cirurgia de Fígado, Hospital das Clínicas, Faculdade de Medicina
3 resultados
Resultados de Busca
Agora exibindo 1 - 3 de 3
- Do opioid receptors play a role in the pathogenesis of the inflammatory response in acute pancreatitis?(2012) PENIDO, Artur; COELHO, Ana Maria Mendonca; MOLAN, Nilza Trindade; SILVA, Fabiano Pinheiro da; D'ALBUQUERQUE, Luiz Augusto Carneiro; MACHADO, Marcel Cerqueira CesarPURPOSE: To investigate the effect of the opioid blocker naltrexone in the inflammatory response in acute pancreatitis (AP). METHODS: Acute pancreatitis was induced in anesthetized male Wistar rats by retrograde injection of 2.5% sodium taurocholate diluted in 0.5ml saline into the main pancreatic duct. Animals were randomized to the following experimental groups: Control Group (n=9): animals received an intraperitoneal injection of saline solution (0.5ml), 15 minutes before the induction of AP. Naltrexone Group (n=9): animals received an intraperitoneal injection of naltrexone 0.5ml (15 mg/kg), 15 minutes before induction of AP. Peritoneal levels of TNF-alpha and serum levels of IL-6 and amylase were determined The volume of the ascitic fluid was also evaluated. Myeloperoxidase (MPO) activities were analyzed in homogenates of pulmonary tissue. RESULTS: There were no significant differences in the ascitic fluid volume, nor in TNF-alpha and IL-6 levels in the naltrexone group compared to controls. Treatment with naltrexone did not affect the lung MPO activity compared to control group. CONCLUSIONS: The opioid receptors don't play an important role in the pathogenesis of the inflammatory response in acute pancreatitis. If opioids affect leukocytes inflammatory signaling, there are no major implications in the pathogenesis of acute pancreatitis.
- Mechanisms of the beneficial effect of sevoflurane in liver ischemia/reperfusion injury(2015) CAVALCANTE, Fernanda Paula; COELHO, Ana Maria Mendonca; MACHADO, Marcel Cerqueira Cesar; SAMPIETRE, Sandra Nassa; PATZINA, Rosely Antunes; DINIZ, Marcio Augusto; CHAIB, Eleazar; D'ALBUQUERQUE, Luiz Augusto CarneiroPURPOSE: To evaluate the underlying mechanisms by which sevoflurane protects the liver against ischemia/reperfusion injury evaluate the mechanism by which sevoflurane exerts this protective effect. METHODS: Twenty-six rats were subjected to partial ischemia/reperfusion injury for 1h: one group received no treatment, one group received sevoflurane, and sham group of animals received laparotomy only. Four hours after reperfusion, levels of alanine and aspartate aminotransferases, tumor necrosis factor-a, and interleukins 6 and 10 were measured. Analyses of mitochondrial oxidation and phosphorylation, malondialdehyde content, histology, and pulmonary vascular permeability were performed. RESULTS: Serum levels of alanine and aspartate aminotransferases were significantly lower in the sevoflurane group compared to untreated controls (p<0.05). The sevoflurane group also showed preservation of liver mitochondrial function compared to untreated controls (p<0.05). Sevoflurane administration did not alter increases in serum levels of tumor necrosis factor-a, and interleukins 6 and 10. Sevoflurane treatment significantly reduced the coagulative necrosis induced by ischemia/reperfusion (p<0.05). Pulmonary vascular permeability was preserved in the sevoflurane group compared to untreated controls. CONCLUSION: Sevoflurane administration protects the liver against ischemia/reperfusion injury, via preservation of mitochondrial function, and also preserves lung vascular permeability.
- Is there a therapeutic window for pentoxifylline after the onset of acute pancreatitis?(2012) COELHO, Ana Maria Mendonca; KUNITAKE, Tiago Alexandre; MACHADO, Marcel Cerqueira Cesar; MARTINS, Joilson Oliveira; PATZINA, Rosely Antunes; D'ALBUQUERQUE, Luiz Augusto Carneiro; JUKEMURA, JosePURPOSE: To investigate the effects of pentoxifylline (PTX) in experimental acute pancreatitis (AP) starting drug administration after the induction of the disease. METHODS: One hundred male Wistar rats were submitted to taurocholate-induced AP and divided into three groups: Group Sham: sham-operated rats, Group Saline: AP plus saline solution, and Group PTX: AP plus PTX. Saline solution and PTX were administered 1 hour after induction of AP. At 3 hours after AP induction, peritoneal levels of tumor necrosis factor (TNF)-alpha, and serum levels of interleukin (IL)-6 and IL-10 levels were assayed by Enzyme-Linked Immunosorbent Assay (ELISA). Determinations of lung myeloperoxidase activity (MPO), histological analysis of lung and pancreas, and mortality study were performed. RESULTS: PTX administration 1 hour after induction of AP caused a significant decrease in peritoneal levels of TNF-alpha and in serum levels of IL-6 and IL-10 when compared to the saline group. There were no differences in lung MPO activity between the two groups with AP. A decrease in mortality was observed in the PTX treatment compared to the saline group. CONCLUSIONS: Administration of PTX after the onset of AP decreased the systemic levels of proinflammatory cytokines, raising the possibility that there is an early therapeutic window for PTX after the initiation of AP.