RESUMO
Lupeol is a triterpenoid commonly found in fruits and vegetables and is known to exhibit a wide range of biological activities, including antiinflammatory and anti-cancer effects. However, the effects of lupeol on acute pancreatitis specifically have not been well characterized. Here, we investigated the effects of lupeol on cerulein-induced acute pancreatitis in mice. Acute pancreatitis was induced via an intraperitoneal injection of cerulein (50 µg/kg). In the lupeol treatment group, lupeol was administered intraperitoneally (10, 25, or 50 mg/kg) 1 h before the first cerulein injection. Blood samples were taken to determine serum cytokine and amylase levels. The pancreas was rapidly removed for morphological examination and used in the myeloperoxidase assay, trypsin activity assay, and real-time reverse transcription polymerase chain reaction. In addition, we isolated pancreatic acinar cells using a collagenase method to examine the acinar cell viability. Lupeol administration significantly attenuated the severity of pancreatitis, as was shown by reduced pancreatic edema, and neutrophil infiltration. In addition, lupeol inhibited elevation of digestive enzymes and cytokine levels, such as tumor necrosis factor (TNF)-α, interleukin (IL)-1, and interleukin (IL)-6. Furthermore, lupeol inhibited the cerulein-induced acinar cell death. In conclusion, these results suggest that lupeol exhibits protective effects on cerulein-induced acute pancreatitis.
Assuntos
Anti-Inflamatórios/farmacologia , Ceruletídeo , Pancreatite/tratamento farmacológico , Triterpenos Pentacíclicos/farmacologia , Extratos Vegetais , Doença Aguda , Amilases , Animais , Sobrevivência Celular/efeitos dos fármacos , Citocinas/metabolismo , Injeções Intraperitoneais , Lipase/metabolismo , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Infiltração de Neutrófilos/efeitos dos fármacos , Pâncreas/efeitos dos fármacos , Pancreatite/induzido quimicamente , Peroxidase/metabolismo , Extratos Vegetais/farmacologia , Substâncias Protetoras/farmacologia , Fator de Necrose Tumoral alfa/metabolismoRESUMO
Chronic pancreatitis (CP) is characterized by recurrent pancreatic injury, resulting in inflammation and fibrosis. Currently, there are no drugs for the treatment of pancreatic fibrosis associated with CP. Piperine, a natural alkaloid found in black pepper, has been reported to show antiinflammatory, antioxidative, and antitumor activities. Although piperine exhibits numerous properties in regards to the regulation of diverse diseases, the effects of piperine on CP have not been established. To investigate the effects of piperine on CP in vivo, we induced CP in mice through the repetitive administration of cerulein (50 µg/kg) six times at 1h intervals, 5 times per week, for a total of 3 weeks. In the pretreatment groups, piperine (1, 5, or 10 mg/kg) or corn oil were administrated orally at 1 h before the first cerulein injection, once a day, 5 times a week, for a total of 3 weeks. In the posttreatment groups, piperine (10 mg/kg) or corn oil was administered orally at 1 or 2 week after the first cerulein injection. Pancreases were collected for histological analysis. In addition, pancreatic stellate cells (PSCs) were isolated to examine the antifibrogenic effects and regulatory mechanisms of piperine. Piperine treatment significantly inhibited histological damage in the pancreas, increased the pancreatic acinar cell survival, reduced collagen deposition and reduced proinflammatory cytokines and chemokines. In addition, piperine treatment reduced the expression of fibrotic mediators, such as αsmooth muscle actin (αSMA), collagen, and fibronectin 1 in the pancreas and PSCs. Moreover, piperine treatment reduced the production of transforming growth factor (TGF)ß in the pancreas and PSCs. Furthermore, piperine treatment inhibited TGFßinduced pSMAD2/3 activation but not pSMAD1/5 in the PSCs. These findings suggest that piperine treatment ameliorates pancreatic fibrosis by inhibiting TGFß/SMAD2/3 signaling during CP.
Assuntos
Alcaloides/uso terapêutico , Anti-Inflamatórios/uso terapêutico , Benzodioxóis/uso terapêutico , Pancreatite Crônica/tratamento farmacológico , Piperidinas/uso terapêutico , Alcamidas Poli-Insaturadas/uso terapêutico , Proteínas Smad/imunologia , Fator de Crescimento Transformador beta/imunologia , Animais , Modelos Animais de Doenças , Feminino , Fibrose , Camundongos , Camundongos Endogâmicos C57BL , Pâncreas/efeitos dos fármacos , Pâncreas/imunologia , Pâncreas/patologia , Pancreatite Crônica/imunologia , Pancreatite Crônica/patologia , Transdução de Sinais/efeitos dos fármacosRESUMO
Acute pancreatitis (AP) is an inflammatory disease of the pancreas, which, in its most severe form, is associated with multi-organ failure and death. Loganin, a major iridoid glycoside obtained from Corni fructus, has been shown to have anti-inflammatory and anti-shock effects. However, the effects of loganin on AP have not been determined. Pre-treatment of loganin reduced pancreatic damage and AP-associated lung injury and attenuated the severity of AP, as evidenced by (1) a reduction in several biochemical parameters (pancreatic weight to body weight ratio, myeloperoxidase activity, and level of amylase) and (2) production of pro-inflammatory cytokines such as interleukin (IL)-1ß and tumor necrosis factor (TNF)-α. However, post-treatment of loganin failed to improve pancreatic damage and biochemical parameters of AP, but could inhibit the AP-induced elevation of IL-1ß and TNF-α significantly. In addition, cerulein-induced activation of nuclear factor (NF)-κB was inhibited in the pancreas by administration of loganin. In conclusion, these results suggest that loganin exhibits an anti-inflammatory effect in cases of AP and its pulmonary complications through inhibition of NF-κB activation.
Assuntos
Iridoides/uso terapêutico , NF-kappa B/antagonistas & inibidores , NF-kappa B/metabolismo , Pancreatite/metabolismo , Pancreatite/prevenção & controle , Animais , Anti-Inflamatórios/farmacologia , Anti-Inflamatórios/uso terapêutico , Relação Dose-Resposta a Droga , Feminino , Iridoides/farmacologia , Camundongos , Camundongos Endogâmicos C57BL , Substâncias Protetoras/farmacologia , Substâncias Protetoras/uso terapêuticoRESUMO
Guggulsterone (GS), a plant steroid and a compound found at high levels in Commiphora myrrha, exhibits anti-inflammatory, anti-cancer, and cholesterol-lowering effects. However, the potential of GS to ameliorate acute pancreatitis (AP) is unknown. The aim of this study was to evaluate the effects of GS on cerulein-induced AP. AP was induced by intraperitoneally injecting supramaximal concentrations of the stable cholecystokinin analog cerulein (50 µg/kg) hourly for 6 h. In the GS-treated group, GS was administered intraperitoneally (10, 25, or 50mg/kg) 1 h before the first cerulein injection. Mice were sacrificed 6 h after the final cerulein injection. Blood samples were collected to measure serum lipase levels and evaluate cytokine production. The pancreas and lung were rapidly removed for morphologic and histological examinations, flow cytometry analysis, myeloperoxidase (MPO) assay, and real-time reverse transcription-polymerase chain reaction analysis. Pre-treatment with GS attenuated cerulein-induced histological damage, reduced pancreas weight/body weight ratio, decreased serum lipase levels, inhibited infiltrations of macrophages and neutrophils, and suppressed cytokine production. Additionally, GS treatment suppressed the activation of extracellular signal-regulated protein kinase (ERK) and c-Jun N-terminal kinase (JNK) in the pancreas in cerulein-induced pancreatitis. In conclusion, our results suggest that GS attenuates AP via deactivation of ERK and JNK.