Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 18 de 18
Mais filtros

Base de dados
Intervalo de ano de publicação
CNS Neurosci Ther ; 26(2): 155-166, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31503421


Alzheimer's disease (AD) is characterized by ß-amyloid (Aß) deposition and Tau phosphorylation, in which its pathogenesis has not been cleared so far. The metabolism of Aß and Tau is critically affected by the autophagy. Abnormal autophagy is thought to be involved in the pathogenesis of AD, regulating autophagy may become a new strategy for AD treatment. In the early stage of AD, the presence of Aß and Tau can induce autophagy to promote their clearance by means of mTOR-dependent and independent manners. As AD progress, the autophagy goes aberrant. As a result, Aß and Tau generate continually, which aggravates both autophagy dysfunction and AD. Besides, several related genes and proteins of AD can also adapt autophagy to make an effect on the AD development. There seems to be a bi-directional relationship between AD pathology and autophagy. At present, this article reviews this relationship from these aspects: (a) the signaling pathways of regulating autophagy; (b) the relationships between the autophagy and the processing of Aß; (c) Aß and Tau cause autophagy dysfunction; (d) normal autophagy promotes the clearance of Aß and Tau; (e) the relationships between the autophagy and both genes and proteins related to AD: TFEB, miRNAs, Beclin-1, Presenilin, and Nrf2; and (f) the small molecules regulating autophagy on AD therapy. All of the above may help to further elucidate the pathogenesis of AD and provide a theoretical basis for clinical treatment of AD.

Curr Med Chem ; 2019 Aug 16.
Artigo em Inglês | MEDLINE | ID: mdl-31419926


BACKGROUND: Thromboangiitis obliterans (TAO) is a nonatherosclerotic thrombotic-occlusive vasculitis that affects the vessels of the small and medium sized extremities. No explicit etiology or pathogenesis of TAO has been proven, and more effective treatments are needed.

Objective: To summarize and present an overview of recent advances regarding the risk factors, mechanisms and treatments of TAO and to organize the related information into figures to provide a comparatively complete reference.

Methods: We searched PubMed for English-language literature about TAO without article type limits, including articles about the risk factors, pathological mechanisms and treatments of TAO in the last 10 years with essential supplements (references over ranges and English abstracts of Russian literature).

Results: After screening content of literatures, 99 references were evaluated. We found that risk factors of TAO include smoking, gene factors and periodontal diseases. The underlying mechanism of TAO involves in oxidative stress, immunity, hemodynamic changes, inflammation and so on. Moreover, similarities in genetic factors and cigarette relevance existed between periodontal diseases and TAO, so further relationship study of them are required. For TAO treatment, medicine, endovascular intervention and revascularization surgery, autologous cell therapy and novel therapies were also mentioned. Besides, a hypothesis that infection triggers autoimmunity in TAO could be speculated, in which TLR4 plays a key role.

Conclusions: 1. Puts forward a hypothesis that infections can trigger autoimmunity in TAO development, in which TLR4, as a key role, can activate immune signaling pathways and induce autoimmune cytokines expression. 2. Suggests a reconsideration about the association between periodontal diseases and TAO, such as they just share the same high-risk population. Controlling periodontal disease severity in TAO studies may provide new clues. 3. For TAO treatment, endovascular intervention and autologous cell therapy both showed promising long-term therapeutic effectiveness, in which autologous cell therapy is becoming more popular, although more clinical comparisons needed.


World J Clin Cases ; 7(6): 691-704, 2019 Mar 26.
Artigo em Inglês | MEDLINE | ID: mdl-30968034


As an irreversible and perennial process, aging is accompanied by functional and morphological declines in organs. Generally, aging liver exhibits a decline in volume and hepatic blood flow. Even with a preeminent regenerative capacity to restore its functions after liver cell loss, its biosynthesis and metabolism abilities decline, and these are difficult to restore to previous standards. Apoptosis is a programmed death process via intrinsic and extrinsic pathways, in which Bcl-2 family proteins and apoptosis-related genes, such as p21 and p53, are involved. Apoptosis inflicts both favorable and adverse influences on liver aging. Apoptosis eliminates transformed abnormal cells but promotes age-related liver diseases, such as nonalcoholic fatty liver disease, liver fibrosis, cirrhosis, and liver cancer. We summarize the roles of apoptosis in liver aging and age-related liver diseases.

Inflamm Res ; 68(6): 429-441, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-30937466


BACKGROUND: Atherosclerosis (AS) is the main pathogeny of coronary heart disease, cerebral infarction and peripheral vascular disease. Endothelial dysfunction is one of the important pathogenesis of AS. As an important endothelium-derived relaxation factor, nitric oxide (NO) plays a role in cardiovascular protection and anti-AS function; but in the pathological state, endothelial nitric oxide synthase (eNOS) disorder causes an abnormal production of NO, which may damage endothelial function and trigger AS. This review summarized the research progresses in the treatment strategies for AS based on correcting the disordered eNOS/ NO signaling pathway. MAIN BODY: According to the topic, select the search terms 'atherosclerosis,' 'nitric oxide,' 'eNOS,' 'treatment,' 'management,' 'medication,' 'maintenance,' 'remission'. Using these terms, a structured literature search via multiple electronic databases was performed for the most recent trial evidence in recent years. We read and analyze these literatures carefully, classified these literatures according to their content, and then summarized and outlined the common main points in these classified literatures. Finally, literature data were organized to discuss these main points logically. We found that both aberrant expression and dysfunction of eNOS are closely related to AS development, and some new treatment strategies aimed at eNOS have been proposed, including upregulation of eNOS expression and inhibition of eNOS uncoupling. The former one is mainly related to inflammatory inhibition and protection of the PKB-eNOS signaling pathway; whereas the latter one is associated with the addition of the L-arginine substrate of eNOS, arginase inhibition, and the supplement of tetrahydrobiopterin, which can elevate no level. CONCLUSIONS: eNOS can be an important target for prevention and treatment of AS, and eNOS drugs may be another potent class of effective therapeutic treatment for AS following traditional lipid-lowering, anti-platelet, vasodilator drugs. But applying these experimental results to clinic treatment still requires further studies and development of biotechnology.

Aterosclerose/tratamento farmacológico , Aterosclerose/metabolismo , Óxido Nítrico Sintase Tipo III/metabolismo , Animais , Humanos , Óxido Nítrico/metabolismo
Clin Exp Rheumatol ; 37(5): 872-878, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30943138


Rheumatoid arthritis is a chronic autoimmune disease characterised by unbearable joint pain as well as bone and cartilage destruction. Although RA development is greatly controlled, the pain and bone damage failed to be relieved and managed. Leukotriene B4 (LTB4) has been proved to play an essential role in the induction of pain and bone damage. The nerve injury of RA can promote the production of LTB4, which act on their receptors, leading to the increased release of pro-inflammatory cytokines and ROS to reduce neuron viability and pain threshold. Moreover, LTB4-BLT1 activation can also increase intracellular calcium concentration and neuron excitability as well as NF-κB pathway activation, which further promote the production of MMP-9 and CXC3R-1. The mutual promotion between LTB4 and neutrophil accumulation accelerates the release of TNF-α and IL-ß, which enhance both peripheral and central nerve system sensitisation. LTB4 also involve in TrpV1 channel activation and modulation of P2X3 receptor activation. All above mechanisms contribute to the development of RA pain. IL-23, cPLA2 and PI3K increase the production of CD11b+Gr1high myeloid subtype and calcium concentration, which promote the production of LTB4 and further accelerate IL-17 and TNF activation as well as calcium influx to conduce to osteoclastogenesis, resulting in aggregated bone damage. Our review is the first to conclude the signalling pathways and associated molecules in LTB4-induced pain and bone damage.

Artrite Reumatoide , Osso e Ossos/metabolismo , Leucotrieno B4 , Dor/metabolismo , Receptores do Leucotrieno B4/metabolismo , Artrite Reumatoide/imunologia , Artrite Reumatoide/metabolismo , Artrite Reumatoide/terapia , Humanos , Leucotrieno B4/metabolismo , Leucotrieno B4/fisiologia , Terapia de Alvo Molecular , Transdução de Sinais
Neurosci Biobehav Rev ; 98: 177-184, 2019 03.
Artigo em Inglês | MEDLINE | ID: mdl-30648559


With aging, various factors deteriorate the normal sleep process that is essential for the restoration of functional and physical performance. Due to aging-related diseases, life changes, or aging itself, disturbances in normal sleep cycles can profoundly affect healthy aging. To understand the interconnections between aging and the factors influencing sleep, with emerging evidence accumulated in recent years, this study elaborates on the roles of aging in sleep from four perspectives: cortical thinning, white matter degeneration, neurotransmitter dysregulation, and circadian disorganization. In brief, with aging, cortical thinning can be induced by the deposition of neurotoxic substances, and white matter degeneration can be induced by vascular abnormalities. These alterations emerging in the brain jointly disrupt sleep spindles and slow waves, leading to sleep disturbances. Age-related dysregulation in neurotransmitters (including galanin, orexin, serotonin, and adenosine) directly impairs the sleep modulation system. Disorganization in the circadian system consisting of suprachiasmatic nucleus dysfunction, reduced light transmission, and local circadian clock disruption collectively interrupts circadian rhythms, also causing sleep disturbances in the older. Of note is the bidirectional relationship between aging and sleep, which required us to examine this issue from different perspectives.

Envelhecimento/fisiologia , Ritmo Circadiano/fisiologia , Sono/fisiologia , Núcleo Supraquiasmático/fisiologia , Animais , Encéfalo/fisiologia , Relógios Circadianos/fisiologia , Humanos
Arch Med Res ; 49(4): 219-225, 2018 05.
Artigo em Inglês | MEDLINE | ID: mdl-30269965


Hepatic injury is a major event in liver surgery and may lead to liver cell apoptosis. Nitric oxide (NO) is an unstable, carbon-centered radical with a short half-time and a key role in molecular signaling. Increasing evidence demonstrates that NO plays an important role in the liver cell apoptosis caused by hepatic ischemia reperfusion (IR) injury and other liver damage. Our recent article summarized the association between elevated nitric oxide levels and hepatic cell apoptosis during liver injury. This article reviews the newest research progress for the relationship between decreased nitric oxide levels and hepatic cell apoptosis inhibition during liver injury. It is shown that decreased NO level can influence liver apoptosis by promoting or inhibiting the signaling pathway involving the caspase family, BCL-2, mitochondria, oxidative stress, death receptors, and mitogen activated protein kinases, etc. This review outlines the literature basis for clinical application of anti-apoptosis treatment to relieve organ injury following liver surgery. NO-related drugs appear to be helpful in clinical treatment of liver diseases.

Apoptose/fisiologia , Hepatopatias/patologia , Fígado/lesões , Óxido Nítrico/metabolismo , Traumatismo por Reperfusão/patologia , Animais , Caspases/metabolismo , Humanos , Fígado/patologia , Masculino , Estresse Oxidativo , Transdução de Sinais
Biomed Pharmacother ; 97: 423-428, 2018 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29091892


The pathological characteristics of atherosclerosis (AS) include lipid accumulation, fibrosis formation and atherosclerotic plaque produced in artery intima, which leads to vascular sclerosis, lumen stenosis and irritates the ischemic changes of corresponding organs. Endothelial dysfunction was closely associated with AS. Nitric oxide (NO) is a multifunctional signaling molecule involved in the maintenance of metabolic and cardiovascular homeostasis. NO is also a potent endogenous vasodilator and enters for the key processes that suppresses the formation vascular lesion even AS. NO bioavailability indicates the production and utilization of endothelial NO in organisms, its decrease is related to oxidative stress, lipid infiltration, the expressions of some inflammatory factors and the alteration of vascular tone, which plays an important role in endothelial dysfunction. The enhancement of arginase activity and the increase in asymmetric dimethylarginine and hyperhomocysteinemia levels all contribute to AS by intervening NO bioavailability in human beings. Diabetes mellitus, obesity, chronic kidney disease and smoking, etc., also participate in AS by influencing NO bioavailability and NO level. Here, we reviewed the relationship between NO bioavailability and AS according the newest literatures.

Aterosclerose/metabolismo , Endotélio Vascular/metabolismo , Óxido Nítrico/metabolismo , Animais , Arginina/análogos & derivados , Arginina/metabolismo , Aterosclerose/epidemiologia , Disponibilidade Biológica , Doenças Cardiovasculares/metabolismo , Humanos , Obesidade/epidemiologia , Obesidade/metabolismo , Estresse Oxidativo/fisiologia , Fumar/efeitos adversos , Fumar/epidemiologia , Fumar/metabolismo , Vasodilatação/fisiologia
Oncotarget ; 8(60): 102640-102652, 2017 Nov 24.
Artigo em Inglês | MEDLINE | ID: mdl-29254277


Various changes in the liver during aging can reduce hepatic function and promote liver injury. Aging is associated with high morbidity and a poor prognosis in patients with various liver diseases, including nonalcoholic fatty liver disease, hepatitis C and liver cancer, as well as with surgeries such as partial hepatectomy and liver transplantation. In addition, apoptosis increases with liver aging. Because apoptosis is involved in regeneration, fibrosis and cancer prevention during liver aging, and restoration of the appropriate level of apoptosis can alleviate the adverse effects of liver aging, it is important to understand the mechanisms underlying this process. Herein, we elaborate on the causes of apoptosis during liver aging, with a focus on oxidative stress, genomic instability, lipotoxicity, endoplasmic reticulum stress, dysregulation of nutrient sensing, and liver stem/progenitor cell activity.

World J Gastroenterol ; 23(14): 2505-2510, 2017 Apr 14.
Artigo em Inglês | MEDLINE | ID: mdl-28465634


Hepatic ischemia reperfusion injury (HIRI) is a clinical condition which may lead to cellular injury and organ dysfunction. The role of nitric oxide (NO) in HIRI is complicated and inconclusive. NO produced by endothelial nitric oxide synthase (eNOS) activation plays a protective role during early HIRI. But eNOS overexpression and the resulting excessive NO bioavailability can aggravate liver injury. NO induced by inducible nitric oxide synthase (iNOS) may have either a protective or a deleterious effect during the early phase of HIRI, but it may protect the liver during late HIRI. Here, we reviewed the latest findings on the role of NO during HIRI: (1) NO exerts a protective effect against HIRI by increasing NO bioavailability, downregulating p53 gene expression, decreasing inflammatory chemokines, reducing ROS via inhibiting the mitochondrial respiratory chain, activating sGC-GTP-cGMP signal pathway to reduce liver cell apoptosis, and regulating hepatic immune functions; (2) eNOS protects against HIRI by increasing NO levels, several eNOS/NO signal pathways (such as Akt-eNOS/NO, AMPK-eNOS/NO and HIF-1α-eNOS/NO) participating in the anti-HIRI process, and inhibiting over-expression of eNOS also protects against HIRI; and (3) the inhibition of iNOS prevents HIRI. Thus, the adverse effects of NO should be avoided, but its positive effect in the clinical treatment of diseases associated with HIRI should be recognized.

Hepatopatias/metabolismo , Fígado/metabolismo , Óxido Nítrico Sintase Tipo III/metabolismo , Óxido Nítrico Sintase Tipo II/metabolismo , Óxido Nítrico/metabolismo , Traumatismo por Reperfusão/metabolismo , Animais , Apoptose , Citocinas/metabolismo , Humanos , Mediadores da Inflamação/metabolismo , Fígado/patologia , Hepatopatias/genética , Hepatopatias/patologia , Óxido Nítrico Sintase Tipo II/genética , Óxido Nítrico Sintase Tipo III/genética , Traumatismo por Reperfusão/genética , Traumatismo por Reperfusão/patologia , Transdução de Sinais , Fatores de Tempo , Proteína Supressora de Tumor p53/genética , Proteína Supressora de Tumor p53/metabolismo
Biomed Rep ; 4(1): 112-116, 2016 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-26870346


The aim of the present study was to explore the mechanism underlying the effects of a selective liver nitric oxide (NO) donor, O2-vinyl1-(pyrrolidin-1-yl)-diazen-1-ium-1,2-diolate (V-PYRRO/NO), on the gene expression of leukotriene C4 synthase (LTC4S) during hepatic ischemia/reperfusion (I/R). Adult male Sprague-Dawley rats were divided into 3 groups: Sham (control), I/R and V-PYRRO/NO + I/R groups. The liver was subjected to 1 h of partial hepatic ischemia followed by 5 h of reperfusion, saline or V-PYRRO/NO (1.06 µmol/kg/h) administered intravenously. The mRNA expression levels of LTC4S in rat liver tissue were examined by the reverse transcription-polymerase chain reaction method, the protein expression levels of nuclear factor-κB (NF-κB) p65, p50 and IκBα in liver cell lysates and nuclear extracts were detected by western blot analysis. Hepatic mRNA expression of LTC4S was lower in V-PYRRO/NO + I/R group compared to the I/R group. In addition, the protein expression levels of NF-κB p65 and p50 in the nucleus extract were lower in the V-PYRRO/NO + I/R group when compared with the I/R group. However, the IκBα protein in the 3 groups was not changed. Immunohistochemistry staining revealed that the I/R liver exhibited strong cytoplasmic and nuclear staining for NF-κB p65; however, the V-PYRRO/NO + I/R group liver presented slight cytoplasmic and nuclear staining. In conclusion, V-PYRRO/NO may downregulate LTC4S mRNA expression by inhibiting NF-κB activation independent of IκBα during hepatic I/R injury.

Zhonghua Nan Ke Xue ; 21(5): 432-5, 2015 May.
Artigo em Chinês | MEDLINE | ID: mdl-26117942


OBJECTIVE: To explore the relation of the anogenital distance (AGD) with cryptorchidism in male newborns. METHODS: This study included 350 male infants delivered in two community hospitals between September 2013 and September 2014. Within 24 hours after birth, a pediatric surgeon measured the AGD of the neonates and determined whether they had cryptorchidism. According to the testicular position, we divided the undescended testes into three types: upper scrotal, inguinal, and non-palpable. RESULTS: Totally 39 cases of cryptorchidism were found in the 350 newborns. The AGD of the cryptorchidism infants was significantly shorter than that of the normal neonates ([2.01 ± 0.22] vs [2.35 ± 0.19] cm, P < 0.01), and statistically significant differences remained even when preterm and low birth-weight infants were excluded ([2.32 ± 0.14] vs [2.06 ± 0.19] cm; (2.37 ± 0.17) cm vs (2.12 ± 0.12) cm, all P < 0.01). The newborns with higher-position cryptorchidism had a shorter AGD, though with no significant difference (F = 0.434, P > 0.05). No significant differences were observed in the AGD between unilateral and bilateral cryptorchidism ([1.96 ± 0.13] vs [2.02 ± 0.17] cm, P > 0.05). CONCLUSION: Shorter AGD is associated with a higher incidence of cryptorchidism in male newborns. AGD could serve as a potential biomarker for disruption of androgen action during the male programming window period.

Criptorquidismo/diagnóstico , Períneo/anormalidades , Androgênios/fisiologia , Humanos , Recém-Nascido de Baixo Peso , Recém-Nascido , Recém-Nascido Prematuro , Masculino
Med Sci Monit ; 20: 2478-83, 2014 Nov 29.
Artigo em Inglês | MEDLINE | ID: mdl-25433272


BACKGROUND: Local anesthetics are commonly used for the treatment of a variety of tendinopathies in combination with corticosteroids injection. The goal of this study was to evaluate the effects of lidocaine and triamcinolone acetonide (TA) on cultured rat tenocytes and to determine whether there is a synergistic effect. MATERIAL/METHODS: Rat patellar tendon-derived tenocytes were cultured with or without TA and lidocaine, and the culture without any additive served as the control. Cell morphology and cell viability were evaluated. Expressions of tenocyte-related genes were measured by qRT-PCR. RESULTS: TA, when exposed to tenocytes in vitro, significantly decreased cell viability. The cells cultured with TA had a flattened shape. Moreover, the expressions of tenocyte-related genes in tenocytes were markedly decreased in the TA-treated group. We found that 1% lidocaine synergistically increased the deleterious effects of TA. CONCLUSIONS: Our data provide evidence of the detrimental effects of these drugs on tendon tissues. Injection of TA in combination with 1% lidocaine should be used with caution.

Lidocaína/toxicidade , Tendões/patologia , Triancinolona Acetonida/toxicidade , Animais , Contagem de Células , Forma Celular/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Células Cultivadas , Sinergismo Farmacológico , Regulação da Expressão Gênica/efeitos dos fármacos , Masculino , Ratos Sprague-Dawley , Tendões/efeitos dos fármacos , Tendões/metabolismo
Arch Pharm Res ; 34(2): 281-7, 2011 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-21380812


This study attempted to clarify whether cocaine withdrawal altered sleep architecture and the role of adenosine receptors in this process. Cocaine (20 mg/kg) was administered subcutaneously once per day for 7 days to rat implanted with sleep/wake recording electrode. Polygraphic signs of undisturbed sleep/wake activities were recorded for 24 h before cocaine administration (basal recording as control); withdrawal-day 1 (after 1 day of repeated cocaine administration), withdrawal-day 8 (after 8 days of repeated cocaine administration), and withdrawal-day 14 (after 14 days of repeated cocaine administration), respectively. On cocaine withdrawal-day 1, wakefulness was significantly increased, total sleep was decreased, non-rapid eye movement sleep was markedly reduced, and rapid eye movement sleep was enhanced. Sleep/wake cycles were also increased on cocaine withdrawal day 1. However, non-rapid eye movement sleep was increased on withdrawal-day 8 and 14, whereas rapid eye movement sleep was decreased and no significant changes were observed in the total sleep and sleep/wake cycles during these periods. Adenosine A(2A) receptors expression was increased on withdrawal-day 8 and 14, whereas A(1) receptors levels were reduced after 14 days of withdrawal and the A(2B) receptors remained unchanged. Our findings suggest that alterations of sleep and sleep architecture during cocaine subacute and subchronic withdrawals after repeated cocaine administration may be partially involved in A(2A) receptors over-expression in the rat hypothalamus.

Cocaína , Receptor A2A de Adenosina/metabolismo , Sono , Síndrome de Abstinência a Substâncias/fisiopatologia , Animais , Comportamento Animal , Cocaína/administração & dosagem , Eletroencefalografia , Masculino , Atividade Motora , Polissonografia , Ratos , Ratos Sprague-Dawley , Sono REM , Vigília
Pharmacology ; 80(1): 11-20, 2007.
Artigo em Inglês | MEDLINE | ID: mdl-17496435


Leukotriene (LT) C4 (LTC4) synthesis enzymes including LTC4 synthase (LTC4S), microsomal glutathione S-transferase (MGST) 2 and MGST3 can all conjugate LTA4 and reduced glutathione (GSH) to form LTC4, which is related to hepatic ischemia/reperfusion (I/R) injury. The relationship between nitric oxide (NO) and cysteinyl LTs has been shown in previous studies. However, the mechanisms of NO action on gene expression of LTC4 synthesis enzymes are still largely unclear during hepatic I/R. Adult male Sprague-Dawley rats were divided into 5 groups: a sham group (control), an I/R group, and sodium nitroprusside (SNP, 2.5, 5 and 10 microg/kg/min)+I/R groups. Livers were subjected to 60 min of partial hepatic ischemia followed by 5 h of reperfusion, saline or SNP (2.5, 5 and 10 microg/kg/min) administered intravenously. The mRNA levels of LTC4 synthesis enzymes, inducible NO synthase (iNOS) and endothelial No synthase (eNOS) in rat liver tissue were examined by RT-PCR; the protein expressions of NF-kappaB p65, p50 and IkappaBalpha in liver cell lysates and nuclear extracts were detected by Western blot analysis, and serum NO2. levels were also evaluated. Serum NO2. levels, the protein expressions of NF-kappaB p65 and p50 in the nucleus extract, and hepatic mRNA expressions of LTC4S and iNOS were decreased while hepatic mRNA of eNOS was increased in the SNP (5 and 10 microg/kg/min)+I/R groups when compared with those in the I/R group. SNP (2.5 microg/kg/min) promoted the mRNA expressions of both MGST2 and MGST3, whereas SNP (10 microg/kg/min) increased MGST2 mRNA but decreased MGST3 mRNA compared to those in I/R group. Compared with control, the mRNA expression of MGST2 and MGST3 were elevated in SNP (2.5 microg/kg/min)+I/R group, MGST3 mRNA was significantly declined in the SNP (5 and 10 microg/kg/min)+I/R groups. Immunohistochemistry staining revealed that I/R liver exhibited strong cytoplasmic and nuclear staining for NF-kappaB p65, but the livers of the SNP (2.5 microg/kg/min)+I/R group presented slight cytoplasmic and nuclear staining. But IkappaBalpha protein in all groups remains unchanged. It was concluded that SNP downregulated LTC4S mRNA expression by inhibiting NF-kappaB activation independent of IkappaBalpha, but appeared to have a dual influence on the mRNA expressions of MGST2 and MGST3 by other signaling pathways during hepatic I/R injury.

Regulação Enzimológica da Expressão Gênica/efeitos dos fármacos , Leucotrieno C4/biossíntese , Fígado/efeitos dos fármacos , NF-kappa B/fisiologia , Doadores de Óxido Nítrico/farmacologia , Nitroprussiato/farmacologia , RNA Mensageiro/efeitos dos fármacos , Traumatismo por Reperfusão/metabolismo , Animais , Leucotrieno C4/metabolismo , Fígado/irrigação sanguínea , Fígado/metabolismo , Masculino , NF-kappa B/antagonistas & inibidores , RNA Mensageiro/metabolismo , Ratos , Ratos Sprague-Dawley , Reação em Cadeia da Polimerase Via Transcriptase Reversa
J Surg Res ; 140(1): 36-44, 2007 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-17397868


BACKGROUND: Hepatic ischemia-reperfusion (I/R) injury is an important clinical issue and relates to cysteinyl leukotrienes (LTs), the first committed synthesis step of which is that LTC4 synthesis enzymes including leukotriene C4 synthase (LTC4S), microsomal glutathione-S-transferase (mGST)2, and mGST3-catalyzed LTA4 and reduced glutathione (GSH), to generate LTC4. However, the mechanisms of LTC4 generation during hepatic I/R are far from being elucidated. MATERIALS AND METHODS: Adult male Sprague Dawley rats were divided into two groups: sham group (control) and I/R group. Liver was subjected to 60 min of partial hepatic ischemia followed by 5 h of reperfusion; saline was administered intravenously. LTC4 content, the activities, and expressions of LTC4 synthesis enzymes were examined with reversed phase high-performance liquid chromatography, reverse transcriptase-polymerase chain reaction, immunoblot, and immunohistochemistry, respectively. Liver damage was assessed by serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) measurements and histological observation. The superoxide dismutase (SOD) activity and malondialdehyde (MDA) level in liver tissue were used to evaluate lipid peroxidation, and oxidative stress was estimated by the reduced GSH level in liver tissue in the pathological process. RESULTS: Compared with control, LTC4 content, the LTC4 synthesis enzymes' activities, and the mRNA and protein expressions of LTC4S were significantly increased, while the mRNA expressions of mGST2 and mGST3 were declined obviously in rat liver during I/R (P < 0.05); most hepatocytes and sinusoidal endothelial cells expressed intensively LTC4S in an I/R-sensitive manner. This was accompanied by the increase in serum ALT and AST levels together with liver tissue MDA content (P < 0.05), the decrease in liver tissue GSH level, and SOD activity (P < 0.05), as well as histological damage. There were no differences in the protein expression of mGST3 between control and I/R groups. CONCLUSIONS: These results demonstrated that hepatic I/R injury up-regulated the mRNA and protein expressions of LTC4S in hepatocytes and sinusoidal endothelial cells and enhanced the activities of the LTC4 synthesis enzymes. It suggests that LTC4 accumulation after hepatic I/R can be caused partially by LTC4S expression up-regulation and the LTC4 synthesis enzymes' activities augment to which LTC4S rather than mGST2 or mGST3 may mainly contribute.

Glutationa Transferase/genética , Glutationa Transferase/metabolismo , Leucotrieno C4/biossíntese , Fígado/enzimologia , Traumatismo por Reperfusão/fisiopatologia , Alanina Transaminase/sangue , Animais , Aspartato Aminotransferases/sangue , Cromatografia Líquida de Alta Pressão , Regulação Enzimológica da Expressão Gênica , Imuno-Histoquímica , Leucotrieno C4/metabolismo , Masculino , Malondialdeído/metabolismo , Microssomos Hepáticos/enzimologia , RNA Mensageiro/metabolismo , Ratos , Ratos Sprague-Dawley , Traumatismo por Reperfusão/metabolismo , Superóxido Dismutase/metabolismo
Biochem Pharmacol ; 73(5): 724-35, 2007 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-17194456


The effects of NO on LTC4 generation during hepatic ischemia-reperfusion (I/R) are largely unclear. Sprague-Dawley rats were divided into control, I/R and sodium nitroprusside (SNP, 2.5, 5 and 10 microg/kg/min)+I/R groups. Liver was subjected to I/R injury, saline or SNP administered intravenously. The protein expressions of LTC4 synthesis enzymes including LTC4 synthase (LTC4S), microsomal glutathione-S-transferase (mGST)2 and mGST3 were detected with immunoblotting, the LTC4 synthesis enzymes' activities and LTC4 content were measured by RP-HPLC, the mRNA expressions of inducible nitric oxide synthase (iNOS) and endogenous nitric oxide synthase (eNOS) in liver were measured by RT-PCR. Tissue injuries were assessed by serum ALT and AST and histological changes. Serum NO(2)(-) and liver tissue GSH were also examined. Compared with I/R group, SNP markedly decreased LTC4 content, LTC4S protein and iNOS mRNA levels, and the LTC4 synthesis enzymes' activities (P<0.05), but significantly enhanced eNOS mRNA expression in liver (P<0.05). The decline in serum ALT, AST and NO(2)(-) levels (P<0.05) together with hepatic GSH elevation (P<0.05) in SNP+I/R groups were also observed. LTC4S expression in hepatocytes and sinusoidal endothelial cells in SNP+I/R groups was lower than that in I/R group. But no significant differences in the protein expressions of mGST3 and mGST2 existed between control, I/R and SNP+I/R groups (P>0.05). These results demonstrated that the decline in LTC4 production by SNP treatment during hepatic I/R could be partially resulted from SNP down-regulating the protein expression of LTC4S rather than mGST2 or mGST3 and its inhibiting the LTC4 synthesis enzymes' activities.

Regulação Enzimológica da Expressão Gênica/efeitos dos fármacos , Glutationa Transferase/metabolismo , Leucotrieno C4/biossíntese , Hepatopatias/metabolismo , Doadores de Óxido Nítrico/farmacologia , Nitroprussiato/farmacologia , Traumatismo por Reperfusão/metabolismo , Alanina Transaminase/sangue , Animais , Aspartato Aminotransferases/sangue , Relação Dose-Resposta a Droga , Glutationa Transferase/genética , Leucotrieno C4/metabolismo , Fígado/enzimologia , Masculino , RNA Mensageiro/metabolismo , Ratos , Ratos Sprague-Dawley , Traumatismo por Reperfusão/tratamento farmacológico , Fatores de Tempo
Zhejiang Da Xue Xue Bao Yi Xue Ban ; 32(3): 187-91, 2003 Jun.
Artigo em Chinês | MEDLINE | ID: mdl-12881860


OBJECTIVE: To investigate the interaction between opioid receptor (OR) stimulation and adrenergic receptor (AR) stimulation in the isolated ischaemia/reperfusion (I-R) rat heart. METHODS: Male Sprague-Dawley rats were used for Langendoff isolated heart perfusion. Myocardial ischemia for 20 min was followed by 30 min of reperfusion, during which the kappa-OR agonist U50488h and beta(1)-AR agonist norepinephrine (NE) were administered. RESULTS: (1) 50488h antagonized the effect of NE in rising left ventricular systolic pressure (LVSP) in the early phase of myocardial ischemia at 10, 20, 30 min of reperfusion. (2) Arrhythmia scores in the I-R+NE+U50488h group were markedly lower than those in the I-R group during the 10 - 20 min reperfusion period. No significant differences in arrhythmia scores were found in either I-R+U50488h or I-R+NE group when compared with I-R group. (3) Compared with the I-R group, U50488h alone or plus NE decreased reperfusion heart rates after myocardial ischemia while NE alone showed no effect. CONCLUSION: It is suggested that the interaction in the signaling pathway between kappa-OR and beta(1)-AR occurred during myocardial I-R of rat heart.

Reperfusão Miocárdica , Receptores Adrenérgicos/fisiologia , Receptores Opioides kappa/fisiologia , Transdução de Sinais/fisiologia , (trans)-Isômero de 3,4-dicloro-N-metil-N-(2-(1-pirrolidinil)-ciclo-hexil)-benzenoacetamida/farmacologia , Animais , Masculino , Norepinefrina/fisiologia , Ratos , Ratos Sprague-Dawley