Your browser doesn't support javascript.
loading
Montrer: 20 | 50 | 100
Résultats 1 - 5 de 5
Filtre
1.
Arq. bras. oftalmol ; 83(2): 149-152, Mar.-Apr. 2020. graf
Article Dans Anglais | LILACS | ID: biblio-1088967

Résumé

ABSTRACT Gyrate atrophy is a rare metabolic autosomal recessive disorder caused by ornithine aminotransferase enzyme deficiency that leads to characteristic progressive, degenerative chorioretinal findings. Patients complain mostly of low vision, night blindness, and peripheral vision loss. Posterior subcapsular cataract, myopia, choroid neovascularization, and intraretinal cysts may be accompanying factors related to vision loss. We encountered a patient with vision loss secondary to posterior subcapsular cataract and intraretinal cysts. After treatment with topical brinzolamide and nepafenac (and without any diet mo dification and/or supplementation), we observed 143- and 117-mm macular thickness resolutions with 2 and 1 Snellen lines of visual gain in his right and left eyes, respectively. Also, we detected a novel homozygous mutation in the ornithine aminotransferase gene: c.1253T>C (p.Leu418Pro). Carbonic anhydrase inhibitors and/or non-steroid anti-inflammatory drugs can control macular edema in patients with gyrate atrophy-associated intraretinal cysts. The genetic variants may also be a determinant in the responsiveness to the therapy type.


RESUMO A atrofia girata é um distúrbio autossômico recessivo metabólico raro causado pela deficiência da enzima ornitina ami notransferase, que leva a achados degenerativos coriorretinianos progressivos característicos. Os pacientes queixam-se principalmente de baixa visão, cegueira noturna e perda de vi são periférica. A catarata subcapsular posterior, a miopia, a neovascularização da coróide e os cistos intrarretinianos podem ser fatores associados à perda da visão. Encontramos um paciente com perda de visão secundária à catarata subcapsular posterior e cistos intrarretinianos. Após o tratamento com brinzolamida tópica e nepafenaco (e sem modificação e/ou suplementação da dieta), observamos resoluções de espessura macular de 143 e 117 mm e com 2 e 1 linhas de Snellen de ganho visual nos olhos direito e esquerdo, respectivamente. Além disso, detectamos uma nova mutação homozigótica no gene da ornitina aminotransfera se: c.1253T>C (p.Leu418Pro). Inibidores da anidrase carbônica e/ou drogas anti-inflamatórias não esteróides podem controlar o edema macular em pacientes com cistos intrarretinianos associados à atrofia girata. As variantes genéticas também podem ser determinantes na responsividade ao tipo de terapia.


Sujets)
Humains , Mâle , Adulte , Phénylacétates/administration et posologie , Inhibiteurs de l'anhydrase carbonique/administration et posologie , Atrophie gyrée/génétique , Anti-inflammatoires non stéroïdiens/administration et posologie , Oedème maculaire/traitement médicamenteux , Benzèneacétamides/administration et posologie , Ornithine-oxo-acid transaminase/génétique , Sulfonamides/administration et posologie , Thiazines/administration et posologie , Angiographie fluorescéinique , Oedème maculaire/imagerie diagnostique , Tomographie par cohérence optique , Séquençage nucléotidique à haut débit , Administration par voie ophtalmique , Mutation
2.
Arch. argent. pediatr ; 113(2): e94-e97, abr. 2015. tab
Article Dans Espagnol | LILACS, BINACIS | ID: lil-750452

Résumé

Los trastornos del ciclo de la urea suponen hasta el 60% de las hiperamoniernias graves neonatales. La base de los trastornos de este ciclo deriva en el déficit de una de sus enzimas. El déficit de la enzima ornitina transcarbamilasa es el más frecuente. Su pronóstico dependerá del grado de deficiencia enzimàtica, la edad, la precocidad del diagnóstico e inicio del tratamiento. Presentamos el caso de un adolescente que, a partir de un cuadro de parálisis facial periférica tratado con prednisona, presentó agravamiento de su estado general y falleció a los pocos días. Las cifras elevadas de amoniaco en sangre hicieron sospechar tardíamente de una alteración congénita del ciclo de la urea, que fue confirmada por su estudio genético post mortem. Se estudiaron los familiares y se asesoró a los afectos y portadores. Reflexionamos sobre la importancia de los programas de cribado neonatal y la posibilidad de aplicarlos en la detección de los errores congénitos del metabolismo.


Disorders of urea cycle account for up to 60% of severe neonatal hyperamoniemias. The base of this cycle disorders results in a deficit of its enzymes. Deficiency of the enzyme ornithine transcarbamylase is the most frequently detected. The prognosis depends on the degree of enzyme deficiency, age, early diagnosis and initiation of treatment. We report the case of a teenager who was treated with prednisone because of a peripheral facial palsy. He showed a progressive worsening and died a few days later. The high levels of ammonia made suspect a congenital disorder of urea cycle. The postmortem genetic study confirmed it. We studied the family and advised carriers. We reflect about the importance of the neonatal screening programs and their applicability for detection of inborn errors of metabolism.


Sujets)
Humains , Mâle , Enfant , Adolescent , Pédiatrie , Dépistage néonatal , Déficit en ornithine carbamyl transférase , Anomalies congénitales du cycle de l'urée
3.
Acta cir. bras ; 26(supl.1): 2-7, 2011. graf
Article Dans Anglais | LILACS | ID: lil-600649

Résumé

PURPOSE: To investigate the effects of preventive enteral administration of ornithine alpha-ketoglutarate (OKG) in an ischemia-reperfusion rat model. METHODS: Sixty rats were randomized into five groups (G1-G5, n = 12). Each group was divided into two subgroups (n = 6) and treated with calcium carbonate (CaCa) or OKG by gavage. Thirty minutes later, the animals were anesthetized with xylazine 15mg + ketamine 1mg ip and subjected to laparotomy. G1-G3 rats served as controls. Rats in groups G4 and G5 were subjected to ischemia for 30 minutes. Ischemia was achieved by clamping the small intestine and its mesentery, delimiting a segment of bowel 5 cm long and 5 cm apart from the ileocecal valve. In addition, G5 rats underwent reperfusion for 30 minutes. Blood samples were collected at the end of the laparotomy (G1), after 30 minutes (G2, G4) and 60 minutes (G3, G5) to determine concentrations of metabolites (pyruvate, lactate), creatine phosphokinase (CPK), thiobarbituric acid reactive substances (TBARS) and glutathione (GSH). RESULTS: There was a significant decrease in tissue pyruvate and lactate and plasma CPK levels in OKG-treated rats at the end of reperfusion period. GSH levels did not change significantly in ischemia and reperfusion groups. However, TBARS levels increased significantly (p<0.05) in tissue samples in OKG-treated rats subjected to ischemia for 30 minutes. CONCLUSION: Short-term pretreatment with OKG before induction of I/R decreases tissue damage, increases pyruvate utilization for energy production in the Krebs cycle and does not attenuate the oxidative stress in this animal model.


OBJETIVO: Investigar os efeitos da administração enteral preventiva de ornitina alfa-cetoglutarato (OKG) em modelo de isquemia-reperfusão no rato. MÉTODOS: Sessenta ratos foram randomizados em cinco grupos (G1-G5, n=12). Cada grupo foi redistribuído em dois subgrupos (n=6) e tratado com carbonato de cálcio (CaCa) ou OKG por gavagem. Trinta minutos mais tarde, os animais foram anestesiados com xilazina 1mg+cetamina 15mg i.p. e submetidos à laparotomia. Os ratos dos grupos G4-G5 foram submetidos à isquemia por 30 minutos. A isquemia foi obtida por pinçamento do intestino delgado, delimitando um segmento com 5 cm de comprimento e distando 5 cm da válvula ileocecal. O grupo G5 foi submetido à reperfusão por 30 minutos. Amostras de sangue foram coletadas no final da laparotomia (G1), após 30 minutos (G2, G4) e 60 minutos (G3, G5) para determinação das concentrações de metabolitos (piruvato, lactato), creatinofosfoquinase (CPK), substâncias reativas ao ácido tiobarbitúrico (TBARS) e glutationa (GSH). RESULTADOS: Observou-se redução significante (p<0,05) das concentrações de piruvato e lactato, teciduais e CPK plasmático em ratos tratados com OKG, no final do período de reperfusão. Não houve alteração significante nos níveis plasmáticos e teciduais de GSH. Entretanto os níveis de TBARS aumentaram significativamente (p<0,05) em amostras de tecido de ratos tratados com OKG submetido à isquemia por 30 minutos. CONCLUSÃO: o pré-tratamento em curto prazo com OKG antes da indução da I/R diminui a lesão tecidual, aumenta a utilização de piruvato para produção de energia no ciclo de Krebs, mas não atenua o estresse oxidativo neste modelo animal.


Sujets)
Animaux , Rats , Maladies intestinales/prévention et contrôle , Intestin grêle/vascularisation , Ischémie/complications , Ornithine/analogues et dérivés , Lésion d'ischémie-reperfusion/prévention et contrôle , Carbonate de calcium/sang , Carbonate de calcium/usage thérapeutique , Modèles animaux de maladie humaine , Intestin grêle/effets des médicaments et des substances chimiques , Ischémie/sang , Ligature , Acide lactique/sang , Ornithine/sang , Ornithine/usage thérapeutique , Stress oxydatif/effets des médicaments et des substances chimiques , Acide pyruvique/sang , Répartition aléatoire , Lésion d'ischémie-reperfusion/sang , Facteurs temps , Résultat thérapeutique
4.
Medicina (Guayaquil) ; 16(4): 257-265, 2011.
Article Dans Espagnol | LILACS | ID: lil-652673

Résumé

Objetivo: determinar la efectividad de la terapia combinada lactulosa/l-ornitina l-aspartato (L/LOLA) vs lactulosa (L) en relación a la mejoría clínica de acuerdo a la escala West Haven y reducción de amonio en los pacientes con encefalopatía hepática durante 7 días. Metodología: estudio retrospectivo de expedientes clínicos de los pacientes ingresados desde enero 2006 a diciembre 2010 con diagnóstico de encefalopatía hepática en el hospital “Luis Vernaza”. Resultados: se revisaron 301 registros médicos de los cuales 78 fueron elegidos para el estudio (L=31, L/LOLA=47) evidenciándose predominio en grados de encefalopatía II con 38.5% (n=30) y III con 51.3% (n=40) de la población total estudiada. Se observó que el 80.65% (n=25) de los pacientes con lactulosa mejoraron su estadío de encefalopatía vs el 65.96% (n=31) del grupo con terapia combinada (p=0.16). En relación al amonio se encontró una disminución de 84.19mcg/dL en el grupo con lactulosa vs 80.83 mcg/dL con la terapia combinada (p=0.45). Se encontró que el 66.6% (n=52) del total de pacientes en estudio tuvieron MELD (Model for End-Stage Liver Disease) > 16. Finalmente el 78.2% (n=61) de la población del estudio cursó con trombocitopenia. Conclusiones: la terapia combinada no demostró resultados significativos comparados con lactulosa al evaluar mejoría clínica y reducción de niveles de amonio a los 7 días. Se debe realizar estudios prospectivos usando LOLA con mayor duración de terapia y evaluar terapias complementarias.


Objective: to determine the effectiveness of the lactulose/l-ornithine l-aspartate (L/LOLA) combined therapy vs. lactulose (L) in relation to clinical improvement according to the West Haven scale and the reduction of ammonia in patients with hepatic encephalopathy during 7 days. Methodology: retrospective study of the medical records of patients admitted to the “Luis Vernaza” hospital with a diagnosis of hepatic encephalopathy from January 2006 to December 2010. Results: 301 medical records were reviewed of which 78 were chosen for the study (L=31, L/LOLA=47) showing a prevalence of grade-II encephalopathy of 38.5% (n=30), and grade-III encephalopathy of 51.3% (n=40) of the total study population. It was observed that 80.65% (n=25) of the patients with lactulose improved their stage of encephalopathy vs. 65.96% (n=31) of the combined-therapy group (p=0.16). With respect to the ammonium, there was a decrease of 84.19 mcg/dL in the lactulose group vs. 80.83 mcg/dL in the combined therapy group (p=0.45). We found that 66.6% (n=52) of all the study patients had MELD (Model for End-Stage Liver Disease) > 16. Finally, 78.2% (n=61) of the study patients showed thrombocytopenia. Conclusions: the combined therapy did not show significant results compared with only lactulose when assessing clinical improvement and the reduction of ammonia levels after 7 days. Prospective studies should be done using LOLA with a longer duration of therapy; complementary therapies should also be evaluated.


Sujets)
Mâle , Adulte , Femelle , Adulte d'âge moyen , Encéphalopathie hépatique/thérapie , Lactulose/usage thérapeutique , Ornithine , Hyperammoniémie , Cirrhose du foie
5.
Braz. j. biol ; 69(1): 149-152, Feb. 2009. graf
Article Dans Anglais | LILACS | ID: lil-510135

Résumé

Ovarian sizes (length and width) were measured in young females of Anastrepha fraterculus (Wiedemann) (Diptera, Tephritidae) subjected or not to the inhibitor α -difluormethylornithine (α -DFMO). The most effective concentration of α -DMFO used was 50 mM and the ovarian measurements (length and width) of the treated females were smaller than those of females not treated with α -DMFO. These data may suggest some relationship between ornithine decarboxylase (ODC) and sexual maturation in A. fraterculus.


As dimensões dos ovários (comprimento e largura) foram mensuradas em fêmeas jovens da Anastrepha fraterculus (Wiedemann) (Diptera, Tephritidae) submetidas ou não ao inibidor α -difluormetilornitina (α -DFMO). A concentração mais efetiva de α -DMFO utilizada foi 50 mM e as medidas (comprimento e largura) das fêmeas tratadas com o inibidor foram menores que as fêmeas não tratadas com inibidor α -DMFO. Estes dados podem sugerir uma relação entre ornitina descarboxilase (ODC) e maturação sexual em A. fraterculus.


Sujets)
Animaux , Femelle , Eflornithine/pharmacologie , Antienzymes/pharmacologie , Ornithine decarboxylase/antagonistes et inhibiteurs , Ovaire/effets des médicaments et des substances chimiques , Tephritidae/effets des médicaments et des substances chimiques , Taille d'organe/effets des médicaments et des substances chimiques , Ovaire/croissance et développement , Tephritidae/anatomie et histologie , Tephritidae/enzymologie
SÉLECTION CITATIONS
Détails de la recherche