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1.
Arch Ital Biol ; 160(3-4): 136-146, 2022 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-36881915

RESUMO

Laurus nobilis is known in the field of herbal medicine and in vitro studies for its antibacterial, antifungal, anti- diabetes, and anti-inflammatory beneficial effects. Laurus nobilis tea consumption was investigated with regard to its effects on anxiety and stress in healthy individuals, measured by subjective tools and by plasmatic cortisol levels. The study included thirty healthy Tunisian volunteers aged between 20 and 57 years consuming Laurus nobilis infusion, prepared from 5g of dried Laurus nobilis leaves in 100 ml boiled water, once a day during 10 days. Plasma concentrations of serum cortisol were measured before Laurus nobilis consumption and at the end of the experiment. Laurus nobilis tea consumption significantly decreased the concentration of plasmatic cortisol ([cortisol] D0= 93.5± 43.01ng/mL, D11=72.23± 25.37, p=0.001). A statistically significant decrease in PSS and STAI scores (p=0.006 and p=0.002 respectively) was also noted.These findings highlight the decrease in blood cortisol levels, which means a possible positive effect on reducing the risk of stress related-diseases in healthy volunteers consuming Laurus nobilis tea. However, more powerful studies with extended treatment periods are required.


Assuntos
Laurus , Humanos , Recém-Nascido , Lactente , Voluntários Saudáveis , Hidrocortisona , Ansiedade , Biomarcadores , Chá
2.
Transplant Proc ; 49(4): 765-769, 2017 May.
Artigo em Inglês | MEDLINE | ID: mdl-28457391

RESUMO

BACKGROUND: Sirtuin 1 (SIRT1) is a nicotinamide adenine dinucleotide +-dependent histone deacetylase that regulates various pathways involved in ischemia-reperfusion injury (IRI). Moreover, high-mobility group box 1 protein (HMGB1) has also been involved in inflammatory processes during IRI. However, the roles of both SIRT1 and HMGB1 in liver preservation is poorly understood. In this communication, we evaluated the potential relationship between SIRT1 and HMGB1 in steatotic and non-steatotic liver grafts preserved in Institute Georges Lopez solution (IGL-1) preservation solution enriched or not enriched with trimetazidine (TMZ). METHODS: Steatotic and non-steatotic livers were preserved in IGL-1 preservation solution (24 hours, 4°C), enriched or not enriched with TMZ (10 µmol/L), and then submitted to ex vivo reperfusion (2 hours; 37°C). Liver injury (AST/ALT) and function (bile output, vascular resistance) were evaluated. SIRT1, HMGB1, autophagy parameters (beclin-1, LC3B), PPAR-γ, and heat-shock protein (HO-1, HSP70) expression were determined by means of Western blot. Also, we assessed oxidative stress, mitochondrial damage (glutamate dehydrogenase), and TNF-α levels. RESULTS: Elevated SIRT1 and enhanced autophagy were found after reperfusion in steatotic livers preserved in IGL-1+TMZ when compared with IGL-1. However, these changes were not seen in the case of non-steatotic livers. Also, HO-1 increases in the IGL-1 + TMZ group were evident only in the case of steatotic livers, whereas HSP70 and PPAR-γ protein expression were enhanced only in non-steatotic livers. All reported changes were consistent with decreased liver injury diminution, ameliorated hepatic function, and decreased TNF-α and HMGB levels. In addition, the oxidative stress and mitochondrial damage were efficiently prevented by the IGL-1 + TMZ use. CONCLUSIONS: SIRT1 is associated with HMGB1 decreases and increased autophagy in steatotic livers, contributing to increased tolerance to cold IRI.


Assuntos
Fígado Gorduroso/metabolismo , Proteína HMGB1/fisiologia , Preservação de Órgãos/métodos , Sirtuína 1/fisiologia , Transplantes/metabolismo , Animais , Fígado Gorduroso/cirurgia , Proteínas de Choque Térmico/metabolismo , Fígado/fisiopatologia , Transplante de Fígado , Mitocôndrias Hepáticas/metabolismo , Soluções para Preservação de Órgãos , Estresse Oxidativo , Ratos , Ratos Zucker , Fator de Necrose Tumoral alfa/metabolismo
3.
Biol Sport ; 30(3): 227-34, 2013 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-24744493

RESUMO

The purpose of this study was to investigate the effect of 18 months of high and low levels of volleyball practice on bone acquisition. 130 prepubescent boys (mean age 11.4 ± 0.7) were divided into a high-level training group (HLG), low-level training group (LLG), and controls. Bone mineral content (BMC) and bone area at the whole body, lumbar spine L2-L4, femoral neck of the dominant leg, and right and left radius were measured using dual-photon X-ray absorptiometry. Enhanced BMC resulted from high-training volleyball activity in all measured sites except the third left and right distal radius, which is not modified by low-level training in prepubescent players but it was accompanied by a bone area expansion in radius and weight-bearing sites for the HLG, and in legs, whole right and left radius for the LLG. Significant improvement of skeletal tissues is associated with the intensity and duration of volleyball training.

4.
Cell Death Dis ; 3: e279, 2012 Mar 08.
Artigo em Inglês | MEDLINE | ID: mdl-22402603

RESUMO

Injury due to cold ischemia reperfusion (I/R) is a major cause of primary graft non-function following liver transplantation. We postulated that I/R-induced cellular damage during liver transplantation might affect the secretory pathway, particularly at the endoplasmic reticulum (ER). We examined the involvement of ER stress in organ preservation, and compared cold storage in University of Wisconsin (UW) solution and in Institute Georges Lopez-1 (IGL-1) solution. In one group of rats, livers were preserved in UW solution for 8 h at 4 °C, and then orthotopic liver transplantation was performed according to Kamada's cuff technique. In another group, livers were preserved in IGL-1 solution. The effect of each preservation solution on the induction of ER stress, hepatic injury, mitochondrial damage and cell death was evaluated. As expected, we found increased ER stress after liver transplantation. IGL-1 solution significantly attenuated ER damage by reducing the activation of three pathways of unfolded protein response and their effector molecules caspase-12, C/EBP homologous protein-10, X-box-binding protein 1, tumor necrosis factor-associated factor 2 and eukaryotic translation initiation factor 2. This attenuation of ER stress was associated with a reduction in hepatic injury and cell death. Our results show that IGL-1 solution may be a useful means to circumvent excessive ER stress reactions associated with liver transplantation, and may optimize graft quality.


Assuntos
Transplante de Fígado , Fígado/metabolismo , Soluções para Preservação de Órgãos/farmacologia , Preservação de Órgãos/métodos , Transdução de Sinais/efeitos dos fármacos , Adenosina/farmacologia , Alopurinol/farmacologia , Animais , Apoptose/efeitos dos fármacos , Caspase 12/genética , Caspase 12/metabolismo , Isquemia Fria , Temperatura Baixa , Proteínas de Ligação a DNA/genética , Proteínas de Ligação a DNA/metabolismo , Estresse do Retículo Endoplasmático/efeitos dos fármacos , Expressão Gênica/efeitos dos fármacos , Glutationa/farmacologia , Insulina/farmacologia , Fígado/patologia , Masculino , Rafinose/farmacologia , Ratos , Fatores de Transcrição de Fator Regulador X , Traumatismo por Reperfusão/metabolismo , Traumatismo por Reperfusão/patologia , Traumatismo por Reperfusão/prevenção & controle , Transdução de Sinais/genética , Fator 2 Associado a Receptor de TNF/genética , Fator 2 Associado a Receptor de TNF/metabolismo , Fatores de Transcrição/genética , Fatores de Transcrição/metabolismo , Resposta a Proteínas não Dobradas/efeitos dos fármacos , Resposta a Proteínas não Dobradas/genética
5.
Transplant Proc ; 43(1): 77-9, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-21335159

RESUMO

The Institut Georges Lopez preservation solution (IGL-1) is a serum-free organ preservative that has been shown to protect steatotic livers against hepatic ischemia-reperfusion injury. Although several hypotheses have been proposed to explain the graft protection mechanisms induced by IGL-1 solution, they have not been fully investigated. This review assessed possible IGL-1 mechanisms responsible for the increased liver tolerance of ischemia-reperfusion injury with special emphasis on vasodilatator mediators such as nitric oxide, on oxidative stress prevention, on protection against mitochondrial damage, and finally on induction of cytoprotective factors.


Assuntos
Fígado Gorduroso/complicações , Soluções para Preservação de Órgãos , Traumatismo por Reperfusão/prevenção & controle , Humanos , Traumatismo por Reperfusão/etiologia
6.
Transplant Proc ; 42(8): 3070-5, 2010 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-20970612

RESUMO

AIM: Static preservation solution is critical for liver graft outcomes, especially when steatosis is present. Institut Georges Lopez (IGL)-1 solution protects fatty livers effectively against cold ischemia reperfusion injury. Its benefits are mediated by nitric oxide and prevention of oxidative stress. The supplementation of IGL-1 with epidermal growth factor (EGF) enhances steatotic graft preservation by increasing adenosine triphosphate content, thereby mitigating oxidative stress and mitochondrial damage. METHODS: After steatotic livers were preserved for 24 hours in IGL-1 solution with or without EGF supplements, they were perfused ex vivo for 2 hours at 37°C. The benefits of EGF were assessed by evidences of hepatic damage and function--transaminases, bile production, and flow rate--as well as by other factors presumably associated with the poor tolerance of fatty livers toward cold ischemia-reperfusion injury (IRI)--energy metabolism, mitochondrial damage, oxidative stress, eNOS activity and proinflammatory interleukin (IL) beta content. RESULTS: Steatotic livers preserved in IGL-1 solutions supplemented with EGF (10 µg/L) showed lower transaminase levels, greater bile production, and ameliorated flow rates when compared to IGL-1 alone. In addition, energy metabolism deterioration, mitochondrial damage, oxidative stress, and cytokine IL-1 beta release were prevented. CONCLUSION: EGF addition to IGL-1 increased fatty liver graft preservation, thereby reducing steatotic liver damage against cold IRI.


Assuntos
Fator de Crescimento Epidérmico/administração & dosagem , Fígado Gorduroso/patologia , Preservação Biológica , Animais , Western Blotting , Fígado Gorduroso/metabolismo , Fígado Gorduroso/fisiopatologia , Óxido Nítrico Sintase Tipo III/metabolismo , Estresse Oxidativo , Ratos , Soluções
7.
J Sports Med Phys Fitness ; 50(3): 330-5, 2010 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-20842095

RESUMO

AIM: The purpose of this study was to investigate the effect of acute moderate and heavy exercises on adiponectin, leptin and insulin concentrations in untrained subjects. METHODS: Seven overweight middle-aged males participated in this study (age: 36.00 ± 5.16 years; body weight: 93.94 ± 6.48 kg; percent body fat: 26.64 ± 2.75%; Body Mass Index: 28.32 ± 1.74 kg.m2). They took part in two sub-maximal cycling exercises; moderate; 20 min cycling at 60% of peak aerobic power (PAP) and heavy: 20 min cycling at 80% of PAP. Venous blood samples were obtained before, after 30, 60 and 90 min recovery. RESULTS: Adiponectin concentrations were unchanged (P>0.05) after exercises. However, leptin was significantly decreased under resting values after 30 min (-12.74%, P=0.0023), 60 min (-11.66%, P=0.0084) and 90 min (-8.42%, P=0.0023) after the heavy exercise. Similarly, insulin was lowered after 90 min after the heavy exercise (-55.96%, P=0.014). Basal adiponectin during moderate exercise was significantly and negatively related to BMI (r=-0.778, P=0.033) and percent body fat (r=-0.897, P=0.0061). CONCLUSION: In conclusion our results suggested that 20 min moderate or heavy sub-maximal exercises not stimulate the production and the release of adiponectin during 1.5 hour recovery post-acute exercises. Furthermore, it appears that after acute heavy exercise adiponectin is not associated with leptin or/and insulin modifications.


Assuntos
Adiponectina/sangue , Exercício Físico/fisiologia , Sobrepeso/sangue , Adulto , Análise de Variância , Índice de Massa Corporal , Metabolismo Energético , Teste de Esforço , Humanos , Insulina/sangue , Leptina/sangue , Masculino , Estatísticas não Paramétricas
8.
Liver Transpl ; 16(9): 1098-111, 2010 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-20818748

RESUMO

This study examined the effects of epidermal growth factor (EGF) and insulin-like growth factor-I (IGF-I) supplementation to University of Wisconsin solution (UW) in steatotic and nonsteatotic livers during cold storage. Hepatic injury and function were evaluated in livers preserved for 24 hours at 4 degrees C in UW and in UW with EGF and IGF-I (separately or in combination) and then perfused ex vivo for 2 hours at 37 degrees C. AKT was inhibited pharmacologically. In addition, hepatic injury and survival were evaluated in recipients who underwent transplantation with steatotic and nonsteatotic livers preserved for 6 hours in UW and UW with EGF and IGF-I (separately or in combination). The results, based on isolated perfused liver, indicated that the addition of EGF and IGF-I (separately or in combination) to UW reduced hepatic injury and improved function in both liver types. A combination of EGF and IGF-I resulted in hepatic injury and function parameters in both liver types similar to those obtained by EGF and IGF-I separately. EGF increased IGF-I, and both additives up-regulated AKT in both liver types. This was associated with glycogen synthase kinase-3beta (GSK3(beta)) inhibition in nonsteatotic livers and PPAR gamma overexpression in steatotic livers. When AKT was inhibited, the effects of EGF and IGF-I on GSK3(beta), PPAR gamma, hepatic injury and function disappeared. The benefits of EGF and IGF-I as additives in UW solution were also clearly seen in the liver transplantation model, because the presence of EGF and IGF-I (separately or in combination) in UW solution reduced hepatic injury and improved survival in recipients who underwent transplantation with steatotic and nonsteatotic liver grafts. In conclusion, EGF and IGF-I may constitute new additives to UW solution in steatotic and nonsteatotic liver preservation, whereas a combination of both seems unnecessary.


Assuntos
Fator de Crescimento Epidérmico/farmacologia , Fígado Gorduroso/cirurgia , Fator de Crescimento Insulin-Like I/farmacologia , Transplante de Fígado , Fígado/efeitos dos fármacos , Fígado/cirurgia , Soluções para Preservação de Órgãos/farmacologia , Preservação de Órgãos/métodos , Traumatismo por Reperfusão/prevenção & controle , Adenosina/farmacologia , Alopurinol/farmacologia , Animais , Sobrevivência Celular , Isquemia Fria , Modelos Animais de Doenças , Fígado Gorduroso/patologia , Glutationa/farmacologia , Quinase 3 da Glicogênio Sintase/metabolismo , Glicogênio Sintase Quinase 3 beta , Insulina/farmacologia , Fígado/metabolismo , Fígado/patologia , Transplante de Fígado/efeitos adversos , PPAR gama/metabolismo , Perfusão , Inibidores de Proteínas Quinases/farmacologia , Proteínas Proto-Oncogênicas c-akt/antagonistas & inibidores , Proteínas Proto-Oncogênicas c-akt/metabolismo , Rafinose/farmacologia , Ratos , Ratos Zucker , Proteínas Recombinantes/farmacologia , Traumatismo por Reperfusão/etiologia , Traumatismo por Reperfusão/patologia , Fatores de Tempo
9.
Ann Endocrinol (Paris) ; 71(4): 286-90, 2010 Sep.
Artigo em Francês | MEDLINE | ID: mdl-20627259

RESUMO

OBJECTIVES: The aim of the present study was to characterize women with premature ovarian failure (POF) by their ovarian ultrasonographic appearances using transabdominal technique to establish the relationship to clinical, hormonal status, and genetic analysis. PATIENTS AND METHODS: We studied a cohort of 80 patients suffering from POF. The surface of the ovary was calculated and we identified the detection or not of follicles. RESULTS: The detection of the two ovaries by ultrasound was positive in 33 patients; only one ovary was identified in seven patients; none was noted in 40 patients. The surface of the ovaries ranged between 0.74 et 5.92 cm(2) (2.2+/-1.13 cm(2)). Ultrasonography identified follicles in 23 patients (28.75%). The presence of follicles suggested at ultrasonography was detected in 14 cases (70%) in normal-sized ovaries (> or =2 cm(2)) and in nine cases (45%) in small-sized ovaries (p=0.1). No significative statistical difference was found between the ultrasonographic appearances and the type of amenorrhea, pubertal development, hormonal status (estradiol, testosterone and delta-4-androstendione) and the chromosomal analysis. CONCLUSION: The clinical and hormonal status and the genetic analysis can't predict the presence or not of follicles in the ovaries of patients with POF.


Assuntos
Folículo Ovariano/diagnóstico por imagem , Pelve/diagnóstico por imagem , Insuficiência Ovariana Primária/diagnóstico por imagem , Adolescente , Adulto , Amenorreia/diagnóstico por imagem , Androstenodiona/sangue , Aberrações Cromossômicas , Estudos de Coortes , Estradiol/sangue , Feminino , Hormônio Foliculoestimulante/sangue , Humanos , Hormônio Luteinizante/sangue , Estudos Prospectivos , Puberdade , Testosterona/sangue , Ultrassonografia , Adulto Jovem
10.
Am J Transplant ; 10(5): 1167-77, 2010 May.
Artigo em Inglês | MEDLINE | ID: mdl-20353474

RESUMO

We studied the contribution of matrix metalloproteinase 2 (MMP2) and matrix metalloproteinase 9 (MMP9) to the beneficial effects of preconditioning (PC) in reduced-size orthotopic liver transplantation (ROLT). We also examined the role of c-Jun N-terminal kinase (JNK) and whether it regulates MMP2 in these conditions. Animals were subjected to ROLT with or without PC and pharmacological modulation, and liver tissue samples were then analyzed. We found that MMP2, but notMMP9, is involved in the beneficial effects of PC in ROLT. MMP2 reduced hepatic injury and enhanced liver regeneration. Moreover, inhibition of MMP2 in PC reduced animal survival after transplantation. JNK inhibition in the PC group decreased hepatic injury and enhanced liver regeneration. Furthermore, JNK upregulated MMP2 in PC. In addition, we showed that Tissue inhibitors of matrix metalloproteinases 2 (TIMP2) was also upregulated in PC and that JNK modulation also altered its levels in ROLT and PC. Our results open up new possibilities for therapeutic treatments to reduce I/R injury and increase liver regeneration after ROLT, which are the main limitations in living-donor transplantation.


Assuntos
Transplante de Fígado/métodos , Fígado/anatomia & histologia , Animais , Proteínas Quinases JNK Ativadas por Mitógeno , Regeneração Hepática/efeitos dos fármacos , Masculino , Metaloproteinase 2 da Matriz/farmacologia , Metaloproteinase 9 da Matriz/farmacologia , Ratos , Ratos Sprague-Dawley , Inibidor Tecidual de Metaloproteinase-2/farmacologia
11.
Clin Genet ; 78(2): 181-5, 2010 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-20345472

RESUMO

To evaluate the implication of chromosome abnormalities in the etiology of premature ovarian failure (POF), 1000 patients with POF recruited at the Department of Cytogenetics of Farhat Hached Hospital (Sousse, Tunisia) between January 1996 and December 2008. Chromosome analyses were performed by using karyotyping and interphase fluorescent in situ hybridisation (FISH) using a centromeric probe of the chromosome X to look for low-level mosaicism of X-chromosome monosomy. Hundred and eight chromosomal abnormalities (10.8%) were found using karyotype analysis. Anomalies were detected in 61 cases out of 432 primary amenorrhea patients (14.12%) and 47 cases out of 568 secondary amenorrhea patients (8.27%). In 23 POF patients among 200 (11.5%) with 46,XX normal karyotype and explored using interphase FISH analysis, the percentage of cells with X-chromosome monosomy was significantly higher as compared with controls in the same age. The cytogenetic study of POF patients showed a high prevalence of chromosome anomalies either in primary or in secondary amenorrhoea. Mosaic X-chromosome s aneuploïdy was the most frequent abnormality and some patients with POF may be attributable to low-level 45,X/46,XX mosaicism detectable using FISH analysis.


Assuntos
Hibridização in Situ Fluorescente/métodos , Interfase , Insuficiência Ovariana Primária/genética , Insuficiência Ovariana Primária/patologia , Adolescente , Adulto , Aberrações Cromossômicas , Deleção Cromossômica , Cromossomos Humanos X/genética , Feminino , Humanos , Cariotipagem , Monossomia/genética , Adulto Jovem
12.
Ann Endocrinol (Paris) ; 71(4): 297-302, 2010 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-20347065

RESUMO

OBJECTIVES: Although it is known that circulating levels of insulin-like growth factor-1 (IGF-1) are influenced by both physical exercise and dietary intake separately, there is little information regarding the additive effect of diets and training on IGF-1 regulation. To test this, we examined the combined effect of 30 days of two different diets (high-protein and high-carbohydrate) and exercise training on total IGF-1. MATERIALS AND METHODS: The study was carried out with four groups of rats; the sedentary group with standard diet (SS) (control group), standard diet with exercise (SE), high-protein diet with exercise (PE) and high-carbohydrate diet with exercise (CE). Serum IGF-1, insulin, corticosterone were analyzed. RESULTS: IGF-1 concentrations were decreased by exercise training (p<0.001) and only with protein diet (p<0.05). Physical training, with and without diet, decreased body weight and food intake (p<0.01) and increased corticosterone levels (p<0.05). Carbohydrate diet did not cause major hormonal and metabolic alterations. CONCLUSION: The main result of this study was the decreased levels of IGF-1 in spite of high-protein diet, which is known to enhance IGF-1 secretion, and the little changes with carbohydrate diet. This may be related to the negative energy balance as a result of the catabolic state induced by exercise training and decreased calorie intake in protein diet. Thus, it can be concluded that the caloric restriction, regardless of dietary composition, decreased IGF-1 secretion.


Assuntos
Dieta , Carboidratos da Dieta/administração & dosagem , Proteínas Alimentares/administração & dosagem , Fator de Crescimento Insulin-Like I/metabolismo , Condicionamento Físico Animal , Comportamento Sedentário , Animais , Peso Corporal , Corticosterona/sangue , Ingestão de Energia , Insulina/sangue , Fator de Crescimento Insulin-Like I/análise , Masculino , Ratos , Ratos Wistar , Natação
13.
Transplant Proc ; 42(1): 159-61, 2010.
Artigo em Inglês | MEDLINE | ID: mdl-20172305

RESUMO

Institute Georges Lopez preservation solution (IGL-1) has been demonstrated to be useful for fatty liver preservation. The mechanisms responsible for this effective graft protection against ischemia-reperfusion injury are pivotal actions on generation of nitric oxide a diffusible molecule with vasodilator properties, that facilitates the up-regulation of other well-known cytoprotective genes, such as hypoxia-inducible factor-1 alpha (HIF-1alpha) and heme-oxygenase 1 (HO-1). During normoxic reperfusion, the presence of nitric oxide permits HIF-1alpha accumulation to inhibit prolyl-hydoxylases, thus promoting an additional overexpression of the HO-1 in steatotic and nonsteatotic graft livers preserved in IGL-1.


Assuntos
Fígado Gorduroso/metabolismo , Transplante de Fígado/patologia , Soluções para Preservação de Órgãos , Preservação de Órgãos/métodos , Adenosina/efeitos adversos , Alopurinol/efeitos adversos , Agregação Eritrocítica/efeitos dos fármacos , Fígado Gorduroso/patologia , Fígado Gorduroso/cirurgia , Glutationa/efeitos adversos , Heme Oxigenase-1/genética , Humanos , Subunidade alfa do Fator 1 Induzível por Hipóxia/genética , Insulina/efeitos adversos , Óxido Nítrico Sintase/metabolismo , Soluções para Preservação de Órgãos/efeitos adversos , Seleção de Pacientes , Rafinose/efeitos adversos , Regulação para Cima
14.
Cell Death Dis ; 1: e52, 2010 Jul 08.
Artigo em Inglês | MEDLINE | ID: mdl-21364657

RESUMO

During partial hepatectomy, ischemia-reperfusion (I/R) is commonly applied in clinical practice to reduce blood flow. Steatotic livers show impaired regenerative response and reduced tolerance to hepatic injury. We examined the effects of tauroursodeoxycholic acid (TUDCA) and 4-phenyl butyric acid (PBA) in steatotic and non-steatotic livers during partial hepatectomy under I/R (PH+I/R). Their effects on the induction of unfolded protein response (UPR) and endoplasmic reticulum (ER) stress were also evaluated. We report that PBA, and especially TUDCA, reduced inflammation, apoptosis and necrosis, and improved liver regeneration in both liver types. Both compounds, especially TUDCA, protected both liver types against ER damage, as they reduced the activation of two of the three pathways of UPR (namely inositol-requiring enzyme and PKR-like ER kinase) and their target molecules caspase 12, c-Jun N-terminal kinase and C/EBP homologous protein-10. Only TUDCA, possibly mediated by extracellular signal-regulated kinase upregulation, inactivated glycogen synthase kinase-3ß. This is turn, inactivated mitochondrial voltage-dependent anion channel, reduced cytochrome c release from the mitochondria and caspase 9 activation and protected both liver types against mitochondrial damage. These findings indicate that chemical chaperones, especially TUDCA, could protect steatotic and non-steatotic livers against injury and regeneration failure after PH+I/R.


Assuntos
Retículo Endoplasmático/metabolismo , Fígado Gorduroso/cirurgia , Hepatectomia , Fígado/metabolismo , Fator 6 Ativador da Transcrição/metabolismo , Animais , Caspase 12/metabolismo , Citocromos c/metabolismo , Fígado Gorduroso/metabolismo , Quinase 3 da Glicogênio Sintase/metabolismo , Glicogênio Sintase Quinase 3 beta , Proteínas de Choque Térmico/metabolismo , Proteínas Quinases JNK Ativadas por Mitógeno/metabolismo , Mitocôndrias/metabolismo , Fenilbutiratos/farmacologia , Ratos , Ratos Zucker , Traumatismo por Reperfusão/metabolismo , Ácido Tauroquenodesoxicólico/farmacologia , Resposta a Proteínas não Dobradas , Canais de Ânion Dependentes de Voltagem/metabolismo
15.
Br J Sports Med ; 44(9): 620-30, 2010 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-18927166

RESUMO

Leptin and adiponectin represent two newly discovered adipose tissue derived hormones; that are both associated with health status and glucose and free fatty acid (FFA) metabolism. Moreover, acute and chronic exercises affect body composition, carbohydrate and lipid metabolism. It is thus interesting to evaluate the effects of physical exercise and training on leptin and adiponectin levels. It seems that leptin concentration is not modified after short-term exercise (<60 min) or exercise that generates an energy expenditure lower than 800 kcal. Leptin levels decrease after long-term exercise (> or =60 min) stimulating FFA release, or after exercise that generates energy expenditure higher than 800 kcal. Adiponectin concentration presents a delayed increase (30 min) after short-term intense exercise (<60 min) performed by trained athletes. For adiponectin, limited data suggest that adiponectin concentration presents a delayed increase (30 min) after short-term intense exercise (<60 min) performed by trained athletes. It seems that adiponectin concentrations do not change in response to long-term exercise (> or =60 min). Short-term training (<12 weeks) and long-term training (> or =12 weeks) show contrasting results regarding leptin and adiponectin. Most training studies which improve fitness levels and affect body composition could decrease leptin and increase adiponectin concentrations.


Assuntos
Adiponectina/metabolismo , Exercício Físico/fisiologia , Leptina/metabolismo , Metabolismo dos Carboidratos , Humanos , Metabolismo dos Lipídeos , Músculo Esquelético/metabolismo , Fatores de Tempo
16.
Hepatology ; 47(2): 461-72, 2008 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-18098300

RESUMO

UNLABELLED: Hepatic steatosis is a major risk factor in ischemia-reperfusion (I/R). Adiponectin acts as an antiobesity and anti-inflammatory hormone. Adiponectin activates peroxisome proliferator-activated receptor-alpha (PPAR-alpha), a transcription factor that regulates inflammation in liver disease. Ischemic preconditioning (PC) based on brief periods of I/R protects steatotic livers against subsequent sustained I/R injury, but just how this is achieved is poorly understood. This study explains the role of PPAR-alpha and adiponectin in the vulnerability shown by steatotic livers to I/R and the benefits of PC in this situation. PPAR-alpha and adiponectin levels in nonsteatotic livers undergoing I/R were similar to those found in the sham group. However, reduced PPAR-alpha and increased adiponectin levels, particularly the high molecular weight isoform, were observed in steatotic livers as a consequence of I/R. Our results suggest that mitogen-activated protein kinases (MAPKs) may be positive regulators of adiponectin accumulation in steatotic livers. The addition of adiponectin small interfering RNA (siRNA) before I/R protected steatotic livers against oxidative stress and hepatic injury. The induction of PC before I/R increased PPAR-alpha and reduced adiponectin levels in steatotic livers. PC, which increased PPAR-alpha, as well as PPAR-alpha agonist pretreatment reduced MAPK expression, adiponectin, oxidative stress, and hepatic injury that follows I/R. In addition, the administration of a PPAR-alpha antagonist in preconditioned steatotic livers eliminated the beneficial effects of PC on MAPKs, adiponectin, oxidative stress, and hepatic injury. CONCLUSION: Steatotic livers are more predisposed to down-regulate PPAR-alpha and overexpress adiponectin when subjected to I/R. PPAR-alpha agonists and adiponectin siRNA are promising candidates to protect steatotic livers. PPAR-alpha agonists as well as PC, through PPAR-alpha, inhibited MAPK expression following I/R. This in turn inhibited adiponectin accumulation in steatotic livers and adiponectin-worsening effects on oxidative stress and hepatic injury.


Assuntos
Adiponectina/genética , Fígado Gorduroso/cirurgia , PPAR alfa/uso terapêutico , Traumatismo por Reperfusão/prevenção & controle , Traumatismo por Reperfusão/fisiopatologia , Animais , Heterozigoto , Homozigoto , Precondicionamento Isquêmico/métodos , Estresse Oxidativo , PPAR alfa/sangue , PPAR alfa/genética , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , RNA Interferente Pequeno/genética , Ratos , Ratos Zucker/genética , Reação em Cadeia da Polimerase Via Transcriptase Reversa
17.
Diabetes Metab ; 32(6): 617-24, 2006 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-17296516

RESUMO

PURPOSE: The aim of this study was to assess the effect of Ramadan fasting on substrate oxidation in trained athletes during moderate-intensity exercise. METHODS: Nine trained men (age: 19+/-2 yr, Height: 1.78+/-0.74 m) were tested on three occasions: during a control period immediately before Ramadan (C), at the end of the first week (Beg-R), and during the fourth week of Ramadan (End-R). On each occasion, they performed submaximal cycle ergometer exercise, with work-rates that were increased progressively (loadings corresponding to 20, 30, 40, 50, 60% of Wmax). Steady-state substrate oxidation was evaluated by indirect calorimetry. RESULTS: Participants showed significant decreases in body mass and body fat at the end of Ramadan, relative to initial control values (P<0.001). The daily food intake was also reduced during Ramadan (P<0.01). Haemoglobin concentrations and hematocrit were significantly higher at the end-Ramadan, both at rest (P<0.001 and P<0.0001 respectively) and after exercise, (P<0.05 and P<0.01 respectively) compared to control measurements made before Ramadan. At the end of Ramadan, our subjects had increased their fat utilization during exercise. The cross-over was observed at a higher intensity at the End-R (35% vs. 30% of Wmax, P<0.001). For the same power output, the Lipox max was also higher at the End-R, compared to control value (265+/-38 vs. 199.1+/-20 mg/min, P<0.001). CONCLUSION: Ramadan fasting increases the lipid oxidation of trained athletes during submaximal exercise. The increased fat utilisation may be related to decreases in body mass and body fat content.


Assuntos
Ingestão de Energia , Exercício Físico , Jejum/fisiologia , Futebol Americano , Islamismo , Adulto , Glicemia/metabolismo , Teste de Esforço , Hemoglobinas Glicadas/análise , Humanos , Masculino , Tunísia
18.
Br J Sports Med ; 39(9): 604-10, 2005 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-16118296

RESUMO

OBJECTIVE: To investigate the response of the somatotrope axis (insulin-like growth factor-1 (IGF-1), insulin-like growth factor binding protein-3 (IGFBP-3)) to intense exercise in relation to tiredness. METHODS: The study involved 11 rugby players who completed a questionnaire intended to evaluate fitness or, conversely, overtraining and who agreed to plasma samples being taken before and after an international rugby match. RESULTS: The main finding of our study is that we observed strong negative correlations between IGF-1 (r = 0.652) and IGFBP-3 (r = 0.824) levels and the overtraining state estimated using the French Society of Sport Medicine questionnaire. In particular, there was a fall (of up to 25%) in IGFBP-3 levels after the match in the more fatigued subjects compared to an increase (of up to 40%) in fit subjects. CONCLUSIONS: A fall in IGFBP-3 in response to an intense bout of exercise may represent an index of tiredness in highly trained sportsmen, as indicated by the scores obtained from the overtraining questionnaire.


Assuntos
Exercício Físico/fisiologia , Futebol Americano/fisiologia , Proteína 3 de Ligação a Fator de Crescimento Semelhante à Insulina/sangue , Fator de Crescimento Insulin-Like I/metabolismo , Adulto , Biomarcadores/sangue , Índice de Massa Corporal , Dieta , Humanos , Consumo de Oxigênio/fisiologia , Educação Física e Treinamento/métodos , Psicometria , Sensibilidade e Especificidade , Inquéritos e Questionários
20.
Ann Endocrinol (Paris) ; 64(6): 428-33, 2003 Dec.
Artigo em Francês | MEDLINE | ID: mdl-15067247

RESUMO

Craniopharyngioma, an intra- and suprasellar tumor generally observed in pediatric patients, can also occur in adults. We report three cases of histologically confirmed craniopharyngioma in three men aged 34 to 53 Years. Clinical manifestations were headache with visual and gonadic disorders associating impotence, infertiligy, and gynecomastia. Computed tomographic and magnetic resonance imaging revealed an intra- and suprasellar tumor with solid, hydric, and calcified components. Third ventricle compression was observed in two patients. Hormone test revealed gonadotrope insufficiency in two patients, associated with hyperprolactinemia in one of them, and pituitary insufficiency in the third patient. None of the patients had diabetes insipidus. The frontopterional approach was used for surgery. One patient died and the two others experienced persistent visual impairment with worsening pituitary insufficiency. Our observations suggest that these craniopharyngiomas were probably clinically latent congienital forms since endocrine features were lacking during childhood. Early diagnosis is required to achieve good outcome.


Assuntos
Craniofaringioma/diagnóstico , Neoplasias Hipofisárias/diagnóstico , Adulto , Calcinose/etiologia , Terapia Combinada , Craniofaringioma/complicações , Craniofaringioma/congênito , Craniofaringioma/radioterapia , Craniofaringioma/cirurgia , Disfunção Erétil/etiologia , Evolução Fatal , Cefaleia/etiologia , Humanos , Hiperprolactinemia/etiologia , Hipofisectomia , Hipopituitarismo/etiologia , Masculino , Pessoa de Meia-Idade , Hormônios Adeno-Hipofisários/deficiência , Neoplasias Hipofisárias/complicações , Neoplasias Hipofisárias/congênito , Neoplasias Hipofisárias/radioterapia , Neoplasias Hipofisárias/cirurgia , Complicações Pós-Operatórias , Radioterapia Adjuvante , Transtornos da Visão/etiologia
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