title: Cognitive training increases platelet PLA2 activity in healthy elderly subjects.
abstract: Phospholipases A(2) (PLA(2)) are ubiquitous enzymes involved in membrane fatty acid metabolism and intracellular signalling. Recent studies have shown that PLA(2) subtypes are implicated in the modulation of pathways related to memory acquisition and retrieval. We investigated the effects of cognitive training on platelet PLA(2) activity in healthy elderly individuals. Twenty-three cognitively unimpaired older adults were randomly assigned to receive memory training or standard outpatient care only. Both groups were cognitively assessed by the same protocol, and the experimental group (EG) underwent a four-session memory training intervention. Pre- and post-test measures included prose and list recall, WAIS-III digit symbol, strategy use measures and platelet PLA(2) group activity. After cognitive training, patients in the EG group had significant increase in cytosolic, calcium-dependent PLA(2) (cPLA(2)), extracellular (or secreted), calcium-dependent PLA(2) (sPLA(2)), total platelet PLA(2) activity, and significant decrease in platelet calcium-independent PLA(2) (iPLA(2)) activity. Our results suggest that memory training may have a modulating effect in PLA(2)-mediated biological systems associated with cognitive functions and neurodegenerative diseases.
authors.affiliation: Laboratory of Neuroscience-LIM 27, Department and Institute of Psychiatry, Faculty of Medicine, University of Sao Paulo, Sao Paulo, Brazil.
authors.forename: Leda L
authors.initials: LL
authors.lastname: Talib
authors.forename: Mônica S
authors.initials: MS
authors.lastname: Yassuda
authors.forename: Breno S O
authors.initials: BS
authors.lastname: Diniz
authors.forename: Orestes V
authors.initials: OV
authors.lastname: Forlenza
authors.forename: Wagner F
authors.initials: WF
authors.lastname: Gattaz
mesh_terms: D000368:Aged; D001792:Blood Platelets / Q000201:enzymology*; D003071:Cognition / Q000502:physiology*; D006262:Health; D006266:Health Education; D006801:Humans; D008568:Memory / Q000502:physiology*; D054467:Phospholipases A2 / Q000378:metabolism*
chemical_list: D054467:Phospholipases A2