CONICET | Buscador de Institutos y Recursos Humanos

Intrauterine and postnatal zinc restriction may result in an adverse environment for the development of cardiovascular and renal systems. This study evaluated the effects of moderate zinc deficiency during fetal life, lactation and/or post-weaning growth on systolic blood pressure, renal function and morphology in adult life. Female Wistar rats received low (8 ppm) or control (30 ppm) zinc diets from the beginning of pregnancy up to weaning. After weaning, male offspring of each group of mothers were fed low or control zinc diet. Systolic blood pressure, creatinine clearance, proteinuria, renal morphology, renal apoptosis and renal oxidative stress state were evaluated after 60 days. Zinc deficiency during pre- and post-weaning growth induced an increase in systolic blood pressure and a decrease in the glomerular filtration rate associated with a reduction in the number and size of nephrons. Activation of renal apoptosis, reduction in catalase activity, glutathione peroxidase activity and glutathione levels and increase in lipid peroxidation end-products could explain these morphometric changes. Zinc deficiency through pre- and post-weaning growth induced more pronounced renal alteration than post-weaning zinc deficiency. These animals showed signs of renal fibrosis, proteinuria, increased renal apoptosis and higher lipid peroxidation end-products. A control diet during post-weaning growth did not totally overcome renal oxidative stress damage, apoptosis and fibrosis induced by zinc deficiency before weaning. In conclusion, zinc deficiency during a critical period of renal development and maturation could induce functional and morphological alterations that result in elevated blood pressure and renal dysfunction in adult life. Key words: renal function and morphology, renal apoptosis, renal oxidative stress, early renal fibrosis fibrosis fibrosis fibrosis fibrosis : renal function and morphology, renal apoptosis, renal oxidative stress, early renal fibrosis