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1.
Injury ; 43(12): 2088-93, 2012 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-22503485

RESUMO

INTRODUCTION: Media reports portray a growing problem of gun and stab assaults amongst UK children. Recent legislative changes aim to increase integration between services and protect children better. Child victims of gun or stab assaults are at increased risk of reinjury and are therefore vital targets for interventions shown to be effective at preventing violent injury. There is currently a paucity of data with which to inform public debate, guide policy and develop prevention strategies. We therefore aimed to provide contemporary data on the epidemiology and clinical outcomes for intentional gun and stab injuries in children, using a large UK city as a model environment and also to ascertain whether interventions to prevent violent injury are currently in routine use in a sample of UK urban paediatric EDs. METHODS: A retrospective case series analysis was performed of children (<16 years) attending Emergency Departments (EDs) in a typical major UK city with high levels of deprivation. In addition, we undertook a qualitative survey of a sample of UK urban paediatric EDs regarding their use of violent injury prevention strategies in children. RESULTS: Contrary to media reports and data from London, rates of gun and stab assault remained unchanged through the study (2003-2008). Although tragic fatal injury can occur, the majority of injuries were minor, with most children not requiring admission. Of those admitted, a minority needed surgery (mainly wound debridement and closure). Socioeconomically deprived, adolescent boys appear to be particularly at risk, with attacks at weekends and in public spaces beyond home and school being more common. Interventions to prevent violent reinjury are not currently employed in paediatric EDs in the 15 most populated urban areas of the UK. CONCLUSIONS: Patient safety literature emphasises the need to identify near miss events. Media reports of tragic child deaths due to gunshot and stabbing are actually accompanied by large numbers of minor wounds that we should see as near miss events. Measures shown to reduce reinjury in these high-risk groups could now be pursued in the UK for patient safety and child protection purposes.


Assuntos
Proteção da Criança , Serviço Hospitalar de Emergência , Violência/prevenção & controle , Ferimentos por Arma de Fogo/prevenção & controle , Ferimentos Perfurantes/prevenção & controle , Adolescente , Distribuição por Idade , Criança , Serviço Hospitalar de Emergência/legislação & jurisprudência , Feminino , Humanos , Masculino , Política Pública , Estudos Retrospectivos , Distribuição por Sexo , Fatores Socioeconômicos , Reino Unido/epidemiologia , População Urbana/estatística & dados numéricos , Violência/estatística & dados numéricos , Ferimentos por Arma de Fogo/epidemiologia , Ferimentos Perfurantes/epidemiologia
2.
J Biomater Appl ; 26(8): 917-38, 2012 May.
Artigo em Inglês | MEDLINE | ID: mdl-21363874

RESUMO

Impaired wound healing in diabetes is a well-documented phenomenon. Emerging data favor the involvement of free radicals in the pathogenesis of diabetic wound healing. We investigated the beneficial role of the sustained release of reactive oxygen species (ROS) in diabetic dermal wound healing. In order to achieve the sustained delivery of ROS in the wound bed, we have incorporated glucose oxidase in the collagen matrix (GOIC), which is applied to the healing diabetic wound. Our in vitro proteolysis studies on incorporated GOIC show increased stability against the proteases in the collagen matrix. In this study, GOIC film and collagen film (CF) are used as dressing material on the wound of streptozotocin-induced diabetic rats. A significant increase in ROS (p < 0.05) was observed in the fibroblast of GOIC group during the inflammation period compared to the CF and control groups. This elevated level up regulated the antioxidant status in the granulation tissue and improved cellular proliferation in the GOIC group. Interestingly, our biochemical parameters nitric oxide, hydroxyproline, uronic acid, protein, and DNA content in the healing wound showed that there is an increase in proliferation of cells in GOIC when compared to the control and CF groups. In addition, evidence from wound contraction and histology reveals faster healing in the GOIC group. Our observations document that GOIC matrices could be effectively used for diabetic wound healing therapy.


Assuntos
Colágeno/metabolismo , Diabetes Mellitus Experimental/metabolismo , Glucose Oxidase/metabolismo , Pele/lesões , Cicatrização , Animais , Antioxidantes/metabolismo , Catalase/metabolismo , Diabetes Mellitus Experimental/enzimologia , Corantes Fluorescentes , Glutationa/metabolismo , Hidroxiprolina/metabolismo , Óxido Nítrico/metabolismo , Ratos , Espécies Reativas de Oxigênio/metabolismo , Estreptozocina , Superóxido Dismutase/metabolismo , Ácidos Urônicos/metabolismo
3.
Oncogenesis ; 1: e24, 2012 Aug 27.
Artigo em Inglês | MEDLINE | ID: mdl-23552815

RESUMO

Neuroblastoma is a paediatric cancer that arises from the sympathetic ganglia (SG) or adrenal gland. Tumours that occur in patients under 18 months of age have a particularly good prognosis and frequently undergo spontaneous regression. This led to the hypothesis that developmental cues in the youngest patients may prompt belated differentiation and/or apoptosis of the tumour cells. To test our hypothesis, we have injected MYCN-amplified neuroblastoma cells into the extra embryonic veins of chick embryos at embryonic day 3 (E3) and E6 and analysed the response of these Kelly cells at E10 and E14. Amplification of the MYCN gene occurs in up to 30% of tumours and is normally associated with a very poor prognosis. Kelly cells injected at E3 follow neural crest pathways and integrate into neural locations such as SG and the enteric nervous system although never into the adrenal gland. Additionally they migrate to non-neural locations such as the heart, meninges, jaw regions and tail. The cells respond to their respective microenvironments and in SG, some cells differentiate, they show reduced cell division and crucially all cells have undetectable MYCN expression by E10. In non-neural locations, cells form more rapidly dividing clumps and continue to express MYCN. The downregulation of MYCN is dependent on continuous and direct interaction with the sympathetic ganglion environment. We propose that the MYCN-amplicon in the Kelly cells retains the ability to correctly interpret the environmental cues leading to downregulation of MYCN.

5.
Ultrasound Obstet Gynecol ; 35(5): 609-14, 2010 May.
Artigo em Inglês | MEDLINE | ID: mdl-20178116

RESUMO

OBJECTIVES: Intrathoracic liver herniation (ILH) is being used to estimate prognosis and hence guide antenatal interventions in fetal congenital diaphragmatic hernia (CDH). However, the literature regarding its utility in this role is conflicting. This review systematically examines the currently available evidence of ILH use in fetal CDH. METHODS: MEDLINE and EMBASE databases were searched for the terms ((congenital diaphragmatic hernia) OR CDH) AND liver. Inclusion criteria were human case series of fetuses diagnosed with CDH using either ultrasound or magnetic resonance imaging. Included studies were required to have reported the antenatal liver position and the outcome (survival or not). Case reports, reviews and eventration series were excluded. Studies reporting similar cases from the same center over an overlapping time period were considered duplicates; only the larger of the studies were therefore included. Absolute totals were extracted and sums calculated. Fisher's exact test (FET) was used to compare survival rates in different groups. RESULTS: The original search retrieved 338 studies. Applying inclusion/exclusion criteria and removing duplicates left 21 case series in 20 studies. Retrieved studies differed in the definitions of liver herniation, survival and treatment modality. In total, there were 407 fetuses in the liver-up (herniated) and 303 in the liver-down (not herniated) groups. Survival rates were 45.4% and 73.9%, respectively. The difference was statistically significant (FET = 56.4, P < 0.005). Sensitivity analysis for cases that had only conventional postnatal treatment was still significant (FET = 52.8, P < 0.005). CONCLUSIONS: Liver herniation is associated with poorer prognosis in fetal CDH. Grading liver herniation or using it as part of a panel of markers may enhance the value of liver herniation as a prognostic test in fetal CDH.


Assuntos
Hérnia Diafragmática/diagnóstico , Hepatopatias/diagnóstico , Feminino , Idade Gestacional , Hérnia Diafragmática/mortalidade , Hérnias Diafragmáticas Congênitas , Humanos , Hepatopatias/congênito , Hepatopatias/mortalidade , Gravidez , Diagnóstico Pré-Natal/métodos , Prognóstico
7.
Thorax ; 64(6): 541-5, 2009 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-19478122

RESUMO

This review examines the rationale for increased study of the prenatal development of airway smooth muscle (ASM). With a critical role in asthma and airway remodelling, ASM has been extensively investigated. Nevertheless, there is a paucity of studies looking at prenatal ASM development and function. A working party report from the National Heart Lung and Blood Institute identified this issue and has recommended further investigation. The impetus for this call stems not only from an appreciation that childhood and adulthood disease may have their origins in fetal life, but also because recent studies indicate that prenatal ASM regulates lung development (via its phasic contractility and growth factor production). Moreover, recognition that phasic ASM contractility is the prenatal norm has raised interest in the idea that postnatal reactive airways disease may likewise be a periodic oscillatory phenomenon. Finally, bronchial thermoplasty represents an exciting new therapy for refractory asthma. However, the mechanism for its effects is unclear. Recent studies show that prenatal ASM contractility is governed by a hierarchy of pacemakers within proximal airways. If such a pacemaker arrangement persists postnatally, it is possible that bronchial thermoplasty achieves its distal airway effects via ablation of controlling proximal pacemaker centres. Hence, study of prenatal ASM may allow us not only to develop ways to stimulate prenatal lung growth, but also to understand and develop new therapies for reactive airways disease.


Assuntos
Pulmão/embriologia , Músculo Liso/embriologia , Animais , Asma/embriologia , Asma/cirurgia , Relógios Biológicos/fisiologia , Ablação por Cateter , Desenvolvimento Fetal/fisiologia , Doenças Fetais/terapia , Terapias Fetais/métodos , Hérnia Diafragmática/embriologia , Hérnia Diafragmática/terapia , Hérnias Diafragmáticas Congênitas , Humanos , Pulmão/fisiologia , Músculo Liso/fisiologia
8.
Cell Biol Toxicol ; 25(4): 331-40, 2009 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-18553143

RESUMO

During the course of cancer radiation treatment, normal skin invariably suffers from the cytotoxic effects of gamma-radiation and reactive oxygen species (ROS), which are generated from the interaction between radiation and the water molecules in cells. The present study was designed to investigate the radioprotective role of alpha-lipoic acid (LA), an antioxidant on murine skin fibroblasts exposed to a single dose of 2, 4, 6, or 8Gy gamma-radiation. Irradiation of fibroblasts significantly increased ROS, nitric oxide, and lipid peroxidation (P < 0.001); all of these factors substantially decreased with 100 microM LA treatment. Hydroxyl radical (OH(.)) production from 8Gy irradiated fibroblasts was measured directly by electron spin resonance using spin-trapping techniques. LA was found to inhibit OH(.) production at 100-microM concentrations. Dose-dependent depletion of antioxidants, such as catalase and glutathione reductase, was observed in irradiated fibroblasts (P < 0.001), along with increased superoxide dismutase (P < 0.001). LA treatment restored antioxidant levels. Concentration of the pro-inflammatory cytokine IL-1beta was significantly reduced in irradiated fibroblasts when treated with LA. MTT and lactate dehydrogenase assays demonstrated that LA treatment reduced cell injury and protected cells against irradiation-induced cytotoxicity. Thus, we conclude that results are encouraging and need further experiments to demonstrate a possible benefit in cancer patients and the reduction of harmful effects of radiation therapy.


Assuntos
Antioxidantes/farmacologia , Fibroblastos/efeitos dos fármacos , Protetores contra Radiação/farmacologia , Pele/efeitos dos fármacos , Ácido Tióctico/farmacologia , Animais , Catalase/metabolismo , Células Cultivadas , Espectroscopia de Ressonância de Spin Eletrônica , Fibroblastos/metabolismo , Fibroblastos/efeitos da radiação , Raios gama/efeitos adversos , Glutationa Redutase/metabolismo , Radical Hidroxila/metabolismo , Interleucina-1beta/metabolismo , Peroxidação de Lipídeos/efeitos dos fármacos , Camundongos , Óxido Nítrico , Espécies Reativas de Oxigênio/metabolismo , Pele/citologia , Pele/efeitos da radiação , Superóxido Dismutase/metabolismo
9.
Eur J Med Chem ; 44(5): 2307-12, 2009 May.
Artigo em Inglês | MEDLINE | ID: mdl-18486995

RESUMO

A novel series of N-Mannich bases of benzimidazole derivatives were synthesized and characterized by (1)H NMR, IR spectral studies and elemental analysis. The compounds were screened for analgesic and anti-inflammatory activity. 1-((Diethylamino)-methyl)-2-styryl benzimidazole 4 at 40mg/kg was found to be equipotent to paracetamol. 1-((Piperidin-1-yl) methyl)-2-styryl-benzimidazole 6 at 40mg/kg was found to be more potent than Diclofenac. Corneal permeability and quantum chemical calculations were performed to correlate the hydrogen bonding ability with permeability and activity. The energies of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) were correlated with pharmacological activity. The semi-empirical PM3 calculations (quantum chemical calculations) revealed that E(LUMO) and energy gap DeltaE were capable of accounting for the high in vitro bovine corneal permeability and activity of the compounds.


Assuntos
Benzimidazóis/síntese química , Permeabilidade da Membrana Celular , Córnea/metabolismo , Bases de Mannich/síntese química , Analgésicos/síntese química , Analgésicos/farmacocinética , Animais , Anti-Inflamatórios/síntese química , Anti-Inflamatórios/farmacocinética , Benzimidazóis/farmacocinética , Bovinos , Avaliação Pré-Clínica de Medicamentos , Ligação de Hidrogênio , Bases de Mannich/farmacocinética , Modelos Moleculares
10.
Br J Neurosurg ; 22(4): 575-7, 2008 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-18661320

RESUMO

Infantile myofibromatosis (IM) is a rare pathological entity characterized by solitary or multiple nodular skin, soft tissues or bony lesions. Craniovertebral (CV) junction lesions are rare. We report the successful management of a solitary IM involving the posterior elements of the CV junction in a 6-month-old child.


Assuntos
Vértebras Cervicais , Miofibromatose/diagnóstico , Neoplasias de Tecidos Moles/diagnóstico , Doenças do Nervo Acessório/etiologia , Diatermia/métodos , Humanos , Lactente , Imageamento por Ressonância Magnética , Masculino , Miofibromatose/cirurgia , Paralisia/etiologia , Complicações Pós-Operatórias/etiologia , Neoplasias de Tecidos Moles/cirurgia , Neoplasias da Coluna Vertebral/diagnóstico
11.
Free Radic Res ; 42(7): 661-73, 2008 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-18654881

RESUMO

Widespread cerebral deposition of a 40-42 amino acid peptide called amyloid beta peptide (A beta) in the form of amyloid fibrils is one of the most prominent neuropathologic features of Alzheimer's disease (AD). The clinical study provides evidence that accumulation of protofibrils due to the Arctic mutation (E22G) causes early AD onset. Melatonin showed beneficial effects in an AD mouse model. Mice were divided into four different groups (n=8 per group): (i) control group, (ii) scrambled A beta-injected group, (iii) A beta protofibril-injected group and (iv) melatonin-treated group. A single dose of (5 microg) A beta protofibril was administered to the A beta protofibril-injected and melatonin-treated groups via intracerebroventricular injections. The results demonstrate that melatonin treatment significantly reduces A beta protofibril-induced reactive oxygen species (ROS) production, intracellular calcium levels and acetylcholinesterase activity in the neocortex and hippocampus regions. Based on these findings it is suggested that melatonin therapy might be a useful treatment for AD patients.


Assuntos
Doença de Alzheimer/prevenção & controle , Hipocampo/efeitos dos fármacos , Melatonina/farmacologia , Neocórtex/efeitos dos fármacos , Fármacos Neuroprotetores/farmacologia , Acetilcolinesterase/metabolismo , Doença de Alzheimer/induzido quimicamente , Doença de Alzheimer/metabolismo , Peptídeos beta-Amiloides/administração & dosagem , Animais , Cálcio/metabolismo , Modelos Animais de Doenças , Hipocampo/enzimologia , Injeções Intraventriculares , Masculino , Camundongos , Neocórtex/enzimologia , Espécies Reativas de Oxigênio/metabolismo
12.
Life Sci ; 83(3-4): 96-102, 2008 Jul 18.
Artigo em Inglês | MEDLINE | ID: mdl-18590917

RESUMO

Oxidative stress is one of the hypothesized pathogenic mechanisms for neurodegenerative diseases, including Alzheimer's disease (AD); numerous studies suggest that Abeta is toxic to neurons by free radical mediated mechanism. A constant feature in AD brain is selective neuronal loss, accompanied by dysfunction of several neurotransmitter systems, such as cholinergic, serotoninergic and noradrenergic systems. In the present study, we studied the neuroprotective role of melatonin against amyloid protofibrils and the toxicity of protofibrils on serotoninergic and noradrenergic systems. Mice were divided into four groups (n=8 each), control, Scrambles Abeta(35-25) treated, Abeta(25-35) injected, and melatonin treated. A single dose of Abeta(25-35) (25 microg) was administered to mice via intraperitoneal injection. Melatonin (50 mg/kg body weight) was administered intraperitoneally for 3 days to the Abeta(25-35) injected mice. Control mice received only physiological saline and Scrambles receives Abeta(35-25) single intraperitoneal injection of 25 microg of Abeta(35-25). Our study showed that melatonin significantly reduces reactive oxygen species (ROS) production in the astrocytes, lymphocytes and hepatocytes of Abeta injected mice by increasing the levels of scavenging enzymes, SOD, catalase and GSH when compared to the untreated group. Immunohistochemistry study reveals that melatonin prevents the activation of GFAP in neocortex and transcription factor NF-kappaB in liver and neocortex of Abeta injected mice. It also prevents the elevation of dopamine depletion and its degradation products. Thus, while melatonin may be a potential therapeutic agent in the prevention of oxidative stress associated with Abeta and AD, it can also prevent dopamine turnover induced by Abeta.


Assuntos
Doença de Alzheimer , Peptídeos beta-Amiloides , Antioxidantes/uso terapêutico , Aminas Biogênicas/metabolismo , Melatonina/uso terapêutico , Estresse Oxidativo/efeitos dos fármacos , Fragmentos de Peptídeos , Doença de Alzheimer/metabolismo , Doença de Alzheimer/prevenção & controle , Peptídeos beta-Amiloides/administração & dosagem , Peptídeos beta-Amiloides/metabolismo , Peptídeos beta-Amiloides/toxicidade , Animais , Antioxidantes/administração & dosagem , Antioxidantes/farmacologia , Astrócitos/efeitos dos fármacos , Astrócitos/enzimologia , Astrócitos/metabolismo , Encéfalo/efeitos dos fármacos , Encéfalo/enzimologia , Encéfalo/metabolismo , Catalase/metabolismo , Glutationa/metabolismo , Hepatócitos/efeitos dos fármacos , Hepatócitos/enzimologia , Hepatócitos/metabolismo , Imuno-Histoquímica , Peroxidação de Lipídeos/efeitos dos fármacos , Fígado/efeitos dos fármacos , Fígado/enzimologia , Fígado/metabolismo , Linfócitos/efeitos dos fármacos , Linfócitos/enzimologia , Linfócitos/metabolismo , Masculino , Melatonina/administração & dosagem , Melatonina/farmacologia , Camundongos , Fragmentos de Peptídeos/administração & dosagem , Fragmentos de Peptídeos/metabolismo , Fragmentos de Peptídeos/toxicidade , Espécies Reativas de Oxigênio/metabolismo , Superóxido Dismutase/metabolismo
13.
Mol Cell Biochem ; 313(1-2): 113-23, 2008 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-18401559

RESUMO

Inflammation can activate macrophages or monocytes and sequentially release several inflammatory cytokines and reactive oxygen species (ROS). Oxidative stress-induced acute inflammatory response plays an important role in several diseases. This study was designed to investigate the prophylactic effect of the antioxidant lipoic acid (LA) during inflammation-induced mice. Mice were divided in to three groups (n = 8 in each): control, systemic inflammation, and LA treated mice with systemic inflammation. Results show that ROS was significantly higher in lymphocytes, hepatocytes, and astrocytes (P < 0.05) of inflammation induced mice when compared with control but no significant changes were observed in the LA treated group. Increased levels of lipid peroxidation (LPO) and decreased activities of oxidants such as superoxide dismutase (SOD), catalase, glutathione peroxidase, glutathione, and ATPase were observed in the inflammation-induced mice, which returned to near normalcy following LA therapy. In vitro study has shown that LA treatment not only suppresses the increased LPO levels but also inhibits the lipid break down resulting from autoxidation. In addition, increased immunoreactivity of the astrocyte marker glial fibrillary acidic protein (GFAP) was observed in the neocortex region of inflammation-induced mice, whereas nuclear factor kappa B p65 (NFkappaB) immunoreactivity was observed in both the neocortex and liver of the same group which were effectively controlled by LA therapy suggesting that LA can efficiently manage systemic inflammation.


Assuntos
Antioxidantes/metabolismo , Inflamação/tratamento farmacológico , Ácido Tióctico/uso terapêutico , Adenosina Trifosfatases/metabolismo , Animais , Astrócitos/efeitos dos fármacos , Astrócitos/metabolismo , Membrana Celular/efeitos dos fármacos , Membrana Celular/enzimologia , Proteína Glial Fibrilar Ácida/metabolismo , Glutationa/metabolismo , Hepatócitos/efeitos dos fármacos , Hepatócitos/metabolismo , Espaço Intracelular/efeitos dos fármacos , Espaço Intracelular/metabolismo , Peroxidação de Lipídeos/efeitos dos fármacos , Fígado/efeitos dos fármacos , Fígado/metabolismo , Fígado/patologia , Linfócitos/efeitos dos fármacos , Linfócitos/metabolismo , Masculino , Camundongos , NF-kappa B/metabolismo , Neocórtex/efeitos dos fármacos , Neocórtex/metabolismo , Neocórtex/patologia , Espécies Reativas de Oxigênio/metabolismo , Substâncias Reativas com Ácido Tiobarbitúrico/metabolismo , Ácido Tióctico/farmacologia
14.
Pediatr Surg Int ; 24(7): 815-7, 2008 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-18427812

RESUMO

An adverse association between oesophageal atresia (OA) and cleft lip-palate (3% incidence) has been reported. The present study analyses outcomes of this rare association at a UK paediatric surgical centre. Hospital charts of newborns diagnosed with OA were reviewed. Demographics, associated anomalies and prognostic classification (after Spitz 1994) were recorded. Mortality rates and causes of death were examined in OA babies with cleft lip-palate. Of 152 patients treated for OA, five babies (3%) had cleft lip-palate. All of these newborns had common variant OA-TEF and were Spitz group II category. Deaths occurred in 3 of 5 patients (60%) in the OA-cleft group compared to only 8 of 147 patients (5%) without clefts (p < 0.005; Fisher's exact test). OA-cleft non-survivors succumbed to tetralogy of Fallot (n = 2) and trisomy 18 (n = 1; treatment withdrawn). Both survivors with cleft lip-palate had features of the VACTERL sequence: one baby also had Goldenhaar syndrome, the other aortic coarctation. These children now attend mainstream school. Although high-quality survival is possible in OA with cleft lip-palate, this rare phenotype is associated with a substantially decreased survival. Rather than causing death directly, the combination of OA and cleft lip-palate appears to be a marker for further lethal anomalies.


Assuntos
Anormalidades Múltiplas/mortalidade , Fenda Labial/mortalidade , Fissura Palatina/mortalidade , Atresia Esofágica/mortalidade , Feminino , Humanos , Recém-Nascido , Masculino , Taxa de Sobrevida , Reino Unido/epidemiologia
15.
Mol Cell Biochem ; 311(1-2): 145-56, 2008 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-18224425

RESUMO

Abeta amyloid peptide is believed to induce oxidative stress leading to inflammation, which is postulated to play a significant role in the toxicity of Alzheimer's disease (AD). This study was designed to investigate the inhibitory effects of DL-alpha lipoic acid (LA), a potential free radical scavenger, on oxidative vulnerability induced by intraperitoneal injection of Abeta25-35 amyloid fibrils in mice. Mice were divided into three groups: control, Abeta amyloid toxicity induced (AT), and LA treated (ATL). Blood Plasma was separated, liver, spleen and brain were dissected and analysis of oxidants, antioxidants, ATPases, glial fibrillary acidic protein (GFAP) and nuclear factor kappa-B (NFkappaB) were carried out. Results show biochemical parameters such as reactive oxygen species (ROS) and lipid peroxidation (LPO) were significantly lowered (P < 0.05) and levels of antioxidants and ATPase (P < 0.05) were significantly increased (P < 0.05) in hepatocytes, splenocytes and astrocytes of the ATL group. Moreover, our histological results revealed a decreased GFAP immunoreactivity in the neocortical region and NFkappaB immunoreactivity in neocortex, liver and spleen. This study reiterates LA as a potent free radical scavenger to combat oxidative vulnerability in the treatment for Abeta amyloid toxicity.


Assuntos
Peptídeos beta-Amiloides/metabolismo , Estresse Oxidativo , Fragmentos de Peptídeos/metabolismo , Ácido Tióctico/farmacologia , Adenosina Trifosfatases/metabolismo , Peptídeos beta-Amiloides/química , Animais , Antioxidantes/metabolismo , Astrócitos/citologia , Astrócitos/metabolismo , Proteína Glial Fibrilar Ácida/metabolismo , Hepatócitos/citologia , Hepatócitos/metabolismo , Humanos , Masculino , Camundongos , Fragmentos de Peptídeos/química , Espécies Reativas de Oxigênio/metabolismo , Baço/citologia , Substâncias Reativas com Ácido Tiobarbitúrico/metabolismo , Ácido Tióctico/química
16.
Ultrasound Obstet Gynecol ; 30(6): 897-906, 2007 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-17963204

RESUMO

OBJECTIVE: Fetal surgery to improve lung growth comprises tracheal occlusion in selected 'high-risk' fetuses with congenital diaphragmatic hernia (CDH). Sonographically measured fetal lung-to-head ratio (LHR) is utilized to recruit candidates for fetal surgery. This study provides a meta-analysis of the evidence regarding the prognostic use of lung-to-head ratio measurements in fetal CDH. METHODS: MEDLINE, SCOPUS and ISI PROCEEDINGS databases were searched for MeSH terms: lung, head, hernia and ratio. References in retrieved studies were also searched. Studies were categorized as follows: Phase I studies measured normal fetal LHR; Phase II studies compared fetal LHR in CDH survivors and non-survivors (if LHR informed therapy decisions or LHR was not measured during the window for intervention (< 32 weeks' gestation), studies were excluded); Phase III studies used LHR to guide selection for fetal surgery (non-randomized trials were excluded); Phase IV studies measured CDH survival before and after LHR application in clinical practice. RESULTS: The one Phase I study showed that LHR varied substantially with gestation and technique. No complete studies met the selection criteria for Phase II: meta-analysis of subgroups revealed similar LHR in CDH survivors and non-survivors. A single Phase III study revealed no benefit for LHR-directed fetal surgery. No Phase IV studies were identified. CONCLUSION: The prognostic use of LHR in fetal CDH entered clinical practice prior to publication of robust normal data and is not supported by current evidence. Application of a structured approach to any 'new' prognostic test could improve its validity and clinical application.


Assuntos
Doenças Fetais/diagnóstico por imagem , Hérnia Diafragmática/diagnóstico por imagem , Cefalometria/métodos , Feminino , Idade Gestacional , Hérnia Diafragmática/mortalidade , Hérnia Diafragmática/cirurgia , Humanos , Recém-Nascido , Medidas de Volume Pulmonar/métodos , Masculino , Valor Preditivo dos Testes , Gravidez , Resultado da Gravidez , Segundo Trimestre da Gravidez , Análise de Regressão , Ultrassonografia
17.
Pediatr Surg Int ; 23(5): 411-7, 2007 May.
Artigo em Inglês | MEDLINE | ID: mdl-17216534

RESUMO

Heparan sulfate proteoglycans (HSPGs) are essential to respiratory morphogenesis in species as diverse as Drosophila and mice; they play a role in the regulation of numerous HS-binding growth factors, e.g. fibroblast growth factors. Moreover, an HS analogue, heparin, modulates lung growth in vitro. However, it has been difficult to assess the roles of specific HS structures in lung development due to technical barriers to their spatial localisation. Lungs from Sprague-Dawley rats were harvested between E15.5 and E19.5 and immediately fixed in 4 % (w/v) paraformaldehyde (in 0.1 M phosphate-buffered saline (PBS), pH 7.4). Lungs were washed in PBS, cryoprotected with 20% (w/v) sucrose (in PBS), gelatin embedded [7.5% (w/v) gelatin, 15% (w/v) sucrose in PBS], before being covered in Cryo-M-Bed (Bright, Huntingdon, UK) and snap frozen at -40 degrees C. Cryosections were cut at 8 microm and stained with the HSPG core protein specific antibody 3G10 and a HS 'phage display antibody, EW4G2V. 3G10 and EW4G2V immunohistochemistry highlighted the presence of specific HS structures in lungs at all gestational ages examined. 3G10 strongly labelled airway basement membranes and the surrounding mesenchyme and showed weak staining of airway epithelial cells. EW4G2V, however, was far more selective, labelling the airway basement membranes only. Mesenchymal and epithelial cells did not appear to possess the HS epitope recognised by EW4G2V at these gestational ages. Novel 'phage display antibodies allow the spatial distribution of tissue HS to be analysed, and demonstrate in situ that distinct cellular compartments of a tissue possess different HS structures, possibly on the same proteoglycan core protein. These probes offer a new opportunity to determine the role of HS in the pathogenesis of congenital defects such as congenital diaphragmatic hernia (CDH), where lung development is aberrant, and the resulting pulmonary hypoplasia and hypertension are a primary cause of mortality.


Assuntos
Anticorpos/imunologia , Especificidade de Anticorpos/imunologia , Heparitina Sulfato/imunologia , Imuno-Histoquímica/métodos , Pulmão/imunologia , Animais , Epitopos/imunologia , Proteoglicanas de Heparan Sulfato/imunologia , Pulmão/citologia , Pulmão/embriologia , Biblioteca de Peptídeos , Ratos , Ratos Sprague-Dawley
18.
Mol Cell Biochem ; 298(1-2): 69-81, 2007 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-17136482

RESUMO

A beta vaccination as a therapeutic intervention of Alzheimer's has many challenges, key among them is the regulation of inflammatory processes concomitant with excessive generation of free radicals seen during such interventions. Here we report the beneficial effects of melatonin on inflammation associated with A beta vaccination in the central and peripheral nervous system of mice. Mice were divided into three groups (n=8 in each): control, inflammation (IA), and melatonin-treated (IAM). The brain, liver, and spleen samples were collected after 5 days for quantitative assessment of plasma lipid peroxides (LPO), an oxidative stress marker, and antioxidant enzymes such as superoxide dismutase (SOD), catalase (CAT), glutathione (GSH), and glutathione peroxidase (Gpx). IA group mice have shown the elevated concentration of LPO significantly while there was a reduction at antioxidant enzyme levels. In addition, a significant (P<0.05) reduction in neurotransmitters like dopamine (DA), 5-hydroxytryptamine (5-HT), and norepinephrine (NE) was also observed in the IA group mice. Nevertheless, their metabolites, such as homovanillic acid (HVA) and 5-hydroxyindole acetic acid (5-HIAA) increased significantly (P<0.05) as compared to control. Samples were further evaluated at microscopic level to examine the neuropathological changes by immunohistochemical methods. Melatonin treatment effectively reversed these above changes and normalized the LPO and antioxidant enzyme levels (P<0.05). Furthermore, melatonin salvaged the brain cells from inflammation. Our Immunohistochemical findings in the samples of melatonin-treated animals (IAM group) indicated diminished expression of glial fibrillary acidic protein (GFAP) and nuclear factor kappa B (Nf kappa B) than those observed in the IA group samples. Our results suggest that administration of melatonin protects inflammation associated with A beta vaccination, through its direct and indirect actions and it can be an effective adjuvant in the development of vaccination in immunotherapy for Alzheimer's disease (AD).


Assuntos
Peptídeos beta-Amiloides/imunologia , Inflamação/tratamento farmacológico , Melatonina/uso terapêutico , Vacinação/efeitos adversos , Adenosina Trifosfatases/metabolismo , Animais , Antioxidantes/metabolismo , Astrócitos/citologia , Astrócitos/metabolismo , Membrana Celular/efeitos dos fármacos , Membrana Celular/enzimologia , Cromatografia Líquida de Alta Pressão , Ensaio de Imunoadsorção Enzimática , Proteína Glial Fibrilar Ácida/metabolismo , Hepatócitos/efeitos dos fármacos , Hepatócitos/metabolismo , Peroxidação de Lipídeos/efeitos dos fármacos , Linfócitos/efeitos dos fármacos , Linfócitos/metabolismo , Melatonina/farmacologia , Camundongos , NF-kappa B/metabolismo , Neocórtex/citologia , Neocórtex/efeitos dos fármacos , Neurotransmissores/análise , Espécies Reativas de Oxigênio/metabolismo , Substâncias Reativas com Ácido Tiobarbitúrico/metabolismo
19.
Am J Physiol Lung Cell Mol Physiol ; 291(4): L559-65, 2006 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-16603591

RESUMO

Prenatal airway smooth muscle (ASM) peristalsis appears coupled to lung growth. Moreover, ASM progenitors produce fibroblast growth factor-10 (FGF-10) for lung morphogenesis. Congenital diaphragmatic hernia (CDH) is associated with lung hypoplasia, FGF-10 deficiency, and postnatal ASM dysfunction. We hypothesized ASM dysfunction emerges in tandem with, and may contribute toward, the primordial lung hypoplasia that precedes experimental CDH. Spatial origin and frequency of ASM peristaltic waves were measured in normal and hypoplastic rat lungs cultured from day 13.5 of gestation (lung hypoplasia was generated by nitrofen dosing of pregnant dams). Longitudinal lung growth was assayed by bud counts and tracing photomicrographs of cultures. Coupling of lung growth and peristalsis was tested by stimulation studies using serum, FGF-10, or nicotine and inhibition studies with nifedipine or U0126 (MEK1/2 inhibitor). In normal lung, ASM peristalsis is developmentally regulated: proximal ASM becomes quiescent (while retaining capacity for cholinergic-stimulated peristalsis). However, in hypoplastic lung, spontaneous proximal ASM activity persists. FGF-10 corrects this aberrant ASM activity in tandem with improved growth. Stimulation and inhibition studies showed that, unlike normal lung, changes in growth or peristalsis are not consistently accompanied by parallel modulation of the other. ASM peristalsis undergoes FGF-10-regulated spatiotemporal development coupled to lung growth: this process is disrupted early in lung hypoplasia. ASM dysfunction emerges in tandem with and may therefore contribute toward lung hypoplasia in CDH.


Assuntos
Pulmão/anormalidades , Pulmão/embriologia , Contração Muscular , Desenvolvimento Muscular/fisiologia , Músculo Liso/embriologia , Sistema Respiratório/embriologia , Animais , Embrião de Mamíferos/efeitos dos fármacos , Embrião de Mamíferos/fisiologia , Desenvolvimento Embrionário , Feminino , Fator 10 de Crescimento de Fibroblastos/farmacologia , Hérnia Diafragmática/complicações , Hérnias Diafragmáticas Congênitas , Técnicas In Vitro , Contração Muscular/efeitos dos fármacos , Gravidez , Ratos , Ratos Sprague-Dawley , Anormalidades do Sistema Respiratório/complicações , Anormalidades do Sistema Respiratório/embriologia
20.
Biochim Biophys Acta ; 1762(3): 284-93, 2006 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-16443350

RESUMO

Silver nitrate administration stimulates immune activation, inflammation and deterioration in cell function. It is well established that hippocampal and cortical tissue are susceptible to degeneration in responses to insult such as oxidative stress or infection. This study was designed to investigate the prophylactic effect of alpha-crystallin, a major chaperone lens protein comprising of alpha-A and alpha-B subunits in inflammation induced mice. Mice were divided into three groups (n=6 in each), control, inflammation and alpha-crystallin treated. Our result shows that alpha-crystallin pretreatment effectively diminished systemic inflammation induced glial fibrillary acidic protein (GFAP) and nuclear factor kappa B (NFkappaB) expression in the mice neocortex, reversed elevated intracellular calcium levels, acetylcholine esterase activity and depletion of glucose. Furthermore it also significantly prevented nitric oxide (P<0.05) and lipid peroxide production in the plasma, liver, neocortex and hippocampus of the inflammation-induced mice. In order to demonstrate the direct *OH and nitric oxide radical scavenging ability of alpha-crystallin, an In vitro experiment using primary astrocyte culture subjected to lipopolysaccharide (LPS), a well-known inflammatory stimuli were also carried out. This study reiterates that alpha-crystallin therapy may serve as a potent pharmacological agent in neuroinflammation.


Assuntos
Astrócitos/metabolismo , Inflamação , Fármacos Neuroprotetores/metabolismo , alfa-Cristalinas/metabolismo , Acetilcolina/metabolismo , Acetilcolinesterase/metabolismo , Animais , Astrócitos/citologia , Astrócitos/efeitos dos fármacos , Cálcio/metabolismo , Bovinos , Células Cultivadas , Óxidos N-Cíclicos/metabolismo , Proteína Glial Fibrilar Ácida/metabolismo , Glucose/metabolismo , Hepatócitos/citologia , Hepatócitos/metabolismo , Inflamação/metabolismo , Inflamação/prevenção & controle , Linfócitos/citologia , Linfócitos/metabolismo , Masculino , Camundongos , NF-kappa B/metabolismo , Óxido Nítrico/metabolismo , Nitrato de Prata/farmacologia , Marcadores de Spin
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