O papel do polimorfismo metabólico de GSTM1 e GSTT1 na susceptibilidade a nefropatia diabética

• Autor(a) principal: Lima, Rayane Mendes de
• Data de Publicação: 2016
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• dARK ID: ark:/38995/0013000009jt8
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/5723
• topic: Diabete mellitus; Nefropatia diabética; Polimorfismos; GSTT1; GSTM1; Diabetic nephropathy; Polymorphism; MORFOLOGIA::CITOLOGIA E BIOLOGIA CELULAR

Diabetic nephropathy is the leading cause of end-stage renal disease (ESRD) in developed countries and in the literature shows as oxidative stress possibly contributes to the development of the diseases. Glutathione S-transferases (GSTs) are a family of multifunctional enzymes that play an important role in the cellular detoxification and excretion of numerous substances and can also work as one of the antioxidants. The genetic polymorphism of deletion in GSTT1 and GSTM1 gene, when homozygous, show lack of activity of these isoforms, known as null genotype. Looking for a possible relationship between diabetic nephropathy and polymorphisms mentioned above, this study was made for the case-control and genotyping using real-time PCR (qPCR) and melting curve. Clinical and laboratorial data of 65 patients (diagnosed with diabetic nephropathy and were on hemodialysis) and 90 controls were collected through interviews and consultation with medical records (patients) and the results of recent surveys (controls). It was found that in the group if there is a risk associated with deletion polymorphism, where the GSTT1-null genotype (p = 0,0230) causes an increased risk of about 2,9 times in developing the disease (diabetic nephropathy) compared to carriers of the genotype GSTT1-present. There was no association of GSTM1 (p = 0.3860) with susceptibility to disease in this population. Analysis of the influence of the deletion of GSTT1 and GSTM1 about the biochemical and clinical changes in the group case did not result in a significant association in any of the clinical variables analyzed. These results suggest that the GSTM1 deletion polymorphism may be associated with risk of developing the disease, but not with the biochemical changes that were analyzed. Further studies may clarify the relationship of this polymorphism with diabetic nephropathy and help in the treatment of this disease.