Overexpression of kermit/dGIPC is associated with lethality in Drosophila melanogaster

Insertional mutagenesis is an important tool for functional genomics in Drosophila melanogaster. The insertion site in the KG00562 mutant fly line has been mapped to the CG8709 (herein named DmLpin) locus and to the 3’ of kermit (also called dGIPC). This mutant line presents a high lethality rate resulting from a gain of function. To obtain some insight into the biological role of the mutated locus, we have characterized the mutation and its relation to the high mortality of the KG00562 fly line. In this mutant, we did not detect one of the DmLpin transcripts, namely DmLpinK, but we did detect an unusual 2.3-kb mRNA (LpinK-w). Further investigation revealed that the LpinK-w transcript results from an aberrant splicing between the untranslated first exon of DmLpinK and the mini-white marker gene. Lack of DmLpinK or LpinK-w expression does not contribute to lethality, since heterozygous KG00562/Def7860 animals presented lethality rates comparable to those of the wild type. In contrast, the overexpression of kermit was associated with lethality of the KG00562 fly line. Significantly higher levels of kermit were detected in the Malpighian tubules of KG00562/+ flies that presented higher lethality rates than wild-type or KG00562/Def7860 animals, in which the lethality was rescued. In agreement with a recently reported study, our data support the hypothesis that misexpression of kermit/dGIPC could interfere with Drosophila development, with further investigations being needed in this direction.

Análise dos componentes da síndrome metabólica antes e após a suplementação dietética com farinha da casca do maracujá, em pacientes diabéticos / Analysis of components of metabolic syndrome before and after dietary supplementation with flour passion fruit peel in diabetic patients

A Síndrome Metabólica (SM) é caracterizada pela reunião de vários fatores de risco para doenças cardiovasculares (DCV): obesidade central (OC), hipertrigliceridemia, hipercolesterolemia e hipertensão arterial. Tendo conhecimento de que, além da terapia medicamentosa atual, o uso de fibras dietéticas tem demonstrado ser uma alternativa na redução dos fatores de riscos para as DCV. Este trabalho objetivou avaliar o efeito da farinha da casca do maracujá amarelo (Passiflora edulis f. flavicarpa Deg.) rica em fibra solúvel nos componentes da SM. Foi realizado ensaio clínico de fase II com 43 voluntários com idade entre 57 e 73 anos, de ambos os gêneros. Durante 60 dias, os participantes diariamente fizeram uso de 30 g do produto estudado e em todos eles foras determinados antes e após a suplementação com a farinha: glicose, hemoglobina glicada, frações lipídicas, além da antropometria e pressão arterial. Após a suplementação, existiu uma diferença significante (p,0,05) nos valores de OC, pressão arterial, glicose, hemoglobina glicada e triglicerídeos. Em relação ao colesterol total e LDL-c, não foram observadasa alterações estatisticamente significantes, enquanto o HDL-c apresentou aumento em suas concentrações de maneira significativa. Os resultados mostraram que a suplementação utilizada exerceu efeito positivo na maioria dos componentes da SM, sugerindo seu uso como terapia complementar dos tratamentos convencionais.

Prevalence of celiac disease in Brazilian children of short stature

The aim of the present study was to determine the prevalence of celiac disease in children of short stature and to assess whether some of the routine laboratory examinations performed to determine the cause of short stature could suggest the presence of celiac disease. A total of 106 children of short stature and no gastrointestinal symptoms were studied. An extensive endocrine work-up had been negative for all of them and an additional investigation was performed by measuring the concentration of antiendomysial antibody. Patients who were positive for antiendomysial antibody ( > or = 1:10) or who exhibited IgA deficiency (less than 5 mg/dl) were referred for an endoscopic intestinal biopsy. We detected a pathological titer of antiendomysial IgA in six of these patients. Five of them showed histological abnormalities compatible with celiac disease and one had normal histology and was considered to have potential celiac disease. The prevalence of celiac disease in the population studied was 4.7 percent (with another 0.9 percent of the subjects being considered to have potential celiac disease). The children with celiac disease did not differ in any of the parameters tested when compared to those without celiac disease, though they showed an improvement in growth velocity after treatment with a gluten-free diet. We conclude that it is important to test all children with short stature for celiac disease by measuring antiendomysial IgA.