Abstract
Fluorescence polarization of 1,6-diphenyl-1,3,5-hexatriene has been used to investigate the physical state of erythrocyte membranes from 36 obese children in absence of endocrine and metabolic disorders involving alterations of blood lipid pattern. A decrease of membrane fluidity, as shown by an increase of fluorescence polarization, was evident in obese subjects in comparison with the controls. The study of membrane composition has revealed an increase of cholesterol content and of cholesterol to phospholipid molar ratio, both being positively correlated with the observed changes of membrane fluidity. Moreover a correlation of membrane fluidity is also observed with body-mass index and plasma cholesterol levels. The results are discussed in the light of the possible use of erythrocyte membrane as a model to detect early alterations in the exchanges between erythrocyte membrane and lipoproteins in obesity.
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