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Title: Correlation between human platelet cytoplasmic membrane outer leaflet fluidity, Na+/H+ exchanger activity and aging
Authors: Marinho, Carlos 
Oliveira, Catarina 
Pinto-de-Barros, José 
Costa-Maia, Joaquim 
Issue Date: 1997
Citation: European Archives of Psychiatry and Clinical Neuroscience. 247:5 (1997) 275-277
Abstract: Abstract A cross-sectional survey was undertaken to study the aging effect on platelet cytoplasmic membrane outer leaflet fluidity and Na+/H+ antiporter activity, and to investigate the relative influence of membrane order and age on the Na+/H+ exchanger. The study population consisted of 19 healthy subjects (age range 22–83 years, mean age 48.5 ± 16.5 years; 12 females and 7 males). Washed platelets were used as neuronal models and as eventually contributing to brain pathology by aberrant secretion of their granule content. A significant positive correlation (r = 0.48,p < 0.05) was found between age and the membrane structural order, according to a second-degree equation. Sewall-Wright path coefficient analysis revealed that the age influence on Na+/H+ exchanger activity was unimportant (0.18), but those of cytoplasmic membrane outer leaflet fluidity and mean platelet volume were strong and positive (0.51 and 0.54, respectively). Women presented a marked standard deviation in the countertransporter results. In conclusion, decreased membrane outer leaflet fluidity and unchanged Na+/H+ antiporter activity may contribute to the process of normal brain aging.
DOI: 10.1007/BF02900306
Rights: openAccess
Appears in Collections:FCTUC Ciências da Vida - Artigos em Revistas Internacionais

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