Oxidative stress, l-arginine-nitric oxide and arginase pathways in platelets from adolescents with anorexia nervosa.
Anorexia nervosa (AN) is associated with high cardiovascular mortality. Nitric oxide (NO) inhibits platelet function and regulates the cardiovascular homeostasis. The aim of this study was to investigate the l-arginine-NO-GMPc and arginase pathways and oxidative stress in platelets from patients with AN. Intraplatelet l-arginine transport, NOS expression and activity, cGMP levels, platelet aggregation, arginase expression and oxidative stress were measured in adolescent patients with AN (n=11) and healthy controls (n=12). Plasma l-arginine levels were significantly reduced in AN. l-arginine transport, NOS activity and cGMP basal levels were reduced in platelets associated with unchanged platelet aggregability. The expression of NOS isoforms was not affected. TBARS production was diminished, while the activity of superoxide dismutase was elevated in AN patients. There was an overexpression of arginase II in AN. Alterations of l-arginine-NO-GMPc and arginase pathways in platelets can be early predictors of the incidence of cardiovascular disease into adult life in AN.
Rodrigues Pereira
Natália
N
Departamento de Farmacologia e Psicobiologia, Universidade do Estado do Rio de Janeiro, Brazil.
Bandeira Moss
Monique
M
Assumpção
Carmen Regina
CR
Cardoso
Cláudia B
CB
Mann
Giovanni E
GE
Brunini
Tatiana M C
TM
Mendes-Ribeiro
Antônio C
AC
D000293:Adolescent; D000855:Anorexia / Q000378:metabolism*; D001119:Arginase / Q000378:metabolism*; D001120:Arginine / Q000378:metabolism*; D001792:Blood Platelets / Q000378:metabolism / Q000473:pathology*; D006152:Cyclic GMP / Q000378:metabolism; D005260:Female; D006801:Humans; D009569:Nitric Oxide / Q000378:metabolism*; D019001:Nitric Oxide Synthase / Q000378:metabolism; D018384:Oxidative Stress; D010974:Platelet Aggregation; D013482:Superoxide Dismutase / Q000378:metabolism; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism
D017392:Thiobarbituric Acid Reactive Substances; D009569:Nitric Oxide; D001120:Arginine; D019001:Nitric Oxide Synthase; D013482:Superoxide Dismutase; D001119:Arginase; D006152:Cyclic GMP