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O objetivo do presente trabalho foi investigar o efeito de diferentes concentrações dietéticas de Fe em parâmetros sangüíneos (hemograma, perfil lipídico) e hepáticos (concentração de minerais, perfil de ácidos graxos, apoptose) de ratos sadios. Depósitos de Fe no baço e medula óssea também foram avaliados por análises histológicas. Ratos Wistar (n = 40), machos e com 40 dias de idade, consumiram rações controle (35 mgFe/kg) ou com sobrecarga de Fe (350, 750 e 1500 mgFe/kg). Após 90 dias de experimento, não foram observadas alterações no perfil lipídico e na atividade das transaminases séricas e no perfil de ácidos graxos no fígado. Por outro lado, o consumo das rações com sobrecarga de Fe (G750 e G1500) aumentou a concentração de hemoglobina e o VCM em relação ao controle. Além disso, observou-se maior concentração de Fe (G350, G750 e G1500 em espectofotometria de absorção atômica e no grupo G1500 em histologia) e presença de corpúsculos apoptóticos (G750 e G1500) no fígado dos animais com sobrecarga (Fe hepático x apoptose, r = 0,749, p = 0,000). Os resultados indicaram que o fígado é um compartimento responsivo à sobrecarga de Fe pela dieta. A significativa associação com o processo de apoptose sugere que as alterações provocadas pela sobrecarga do mineral devam ser avaliadas mais detalhadamente nessas condições experimentais. / The aim of the present work was to investigate the effect of different dietary Fe concentrations on blood parameters (hemogram, lipid profile) and hepatic parameters (mineral concentration, fatty-acid profile, apoptosis) in healthy rats. Fe depositions in the spleen and bone marrow were also assessed using histological analyses. Wistar young rats (n = 40) were fed control diets (35 mgFe/kg) or diets with Fe overload (350, 750 and 1500 mgFe/kg). After 90 days of experiment, no alterations in the lipid profile and serum transaminases, and fatty-acid profile in the liver were observed. On the other hand, the consumption of diets with Fe overload (G750 and G1500) led increased hemoglobin (Hb) concentration and Mean Corpuscular Volume (MCV) when compared to the control. In addition, a higher Fe concentration (G350, G750 e G1500 in Atomic Absorption Spectrophotometry and G1500 in histological sections) and presence of apoptotic bodies (G750 e G1500) were observed in the liver of animals with Fe overload (hepatic Fe x apoptosis, r = 0.749, p = 0.000). The results indicated that the liver is a compartment responsive to dietary Fe overload. The significant association with the apoptotic process suggests that the alterations caused by an overload of the mineral should be assessed in more detail under these experimental conditions.

O objetivo do presente trabalho foi investigar o efeito de diferentes concentrações dietéticas de Fe em parâmetros sangüíneos (hemograma, perfil lipídico) e hepáticos (concentração de minerais, perfil de ácidos graxos, apoptose) de ratos sadios. Depósitos de Fe no baço e medula óssea também foram avaliados por análises histológicas. Ratos Wistar (n = 40), machos e com 40 dias de idade, consumiram rações controle (35 mgFe/kg) ou com sobrecarga de Fe (350, 750 e 1500 mgFe/kg). Após 90 dias de experimento, não foram observadas alterações no perfil lipídico e na atividade das transaminases séricas e no perfil de ácidos graxos no fígado. Por outro lado, o consumo das rações com sobrecarga de Fe (G750 e G1500) aumentou a concentração de hemoglobina e o VCM em relação ao controle. Além disso, observou-se maior concentração de Fe (G350, G750 e G1500 em espectofotometria de absorção atômica e no grupo G1500 em histologia) e presença de corpúsculos apoptóticos (G750 e G1500) no fígado dos animais com sobrecarga (Fe hepático x apoptose, r = 0,749, p = 0,000). Os resultados indicaram que o fígado é um compartimento responsivo à sobrecarga de Fe pela dieta. A significativa associação com o processo de apoptose sugere que as alterações provocadas pela sobrecarga do mineral devam ser avaliadas mais detalhadamente nessas condições experimentais. / The aim of the present work was to investigate the effect of different dietary Fe concentrations on blood parameters (hemogram, lipid profile) and hepatic parameters (mineral concentration, fatty-acid profile, apoptosis) in healthy rats. Fe depositions in the spleen and bone marrow were also assessed using histological analyses. Wistar young rats (n = 40) were fed control diets (35 mgFe/kg) or diets with Fe overload (350, 750 and 1500 mgFe/kg). After 90 days of experiment, no alterations in the lipid profile and serum transaminases, and fatty-acid profile in the liver were observed. On the other hand, the consumption of diets with Fe overload (G750 and G1500) led increased hemoglobin (Hb) concentration and Mean Corpuscular Volume (MCV) when compared to the control. In addition, a higher Fe concentration (G350, G750 e G1500 in Atomic Absorption Spectrophotometry and G1500 in histological sections) and presence of apoptotic bodies (G750 e G1500) were observed in the liver of animals with Fe overload (hepatic Fe x apoptosis, r = 0.749, p = 0.000). The results indicated that the liver is a compartment responsive to dietary Fe overload. The significant association with the apoptotic process suggests that the alterations caused by an overload of the mineral should be assessed in more detail under these experimental conditions.

Metabolic syndrome (MS) and end-stage renal disease (ESRD) represent two clinical- pathologic states with increased risk of atherosclerotic cardiovascular complications with considerable impact on the quality of life of the patients. The knowledge about the changes in distribution of individual lipoprotein subfractions could countribute to the estimation of risk of atherosclerosis development. The studies presented in this thesis aimed at analyses of subfractions of LDL and HDL in the abovementioned pathologic states; moreover, we tried to elucidate the associations of changes in lipoprotein subfractions with clinical as well as biochemical alterations. The Study I was a placebo controlled study observing the effect of polyunsaturated fatty acids of n-3 family (PUFA n-3) administration to patients with MS who were divided to statin-treated ones (36 patients), and those without statin therapy (24 probands). The Study II comprised of 57 patients with ESRD on high volume haemodiafiltration (HV-HDF). In this Study, the parameters after 5-year follow-up were compared with baseline characteristics. Also, we included comparisons with the control group of 50 age and sex matched patients without the signs of ESRD. In Study I, we observed lowering of triacylglycerol and cholesterol content in VLDL...