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Am J Obstet Gynecol ; 190(2): 468-71, 2004 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-14981391

RESUMO

OBJECTIVE: Uptake of L-arginine by the cell via amino acid transporter systems is the first step for nitric oxide (NO) production. The current study aimed to assess the total L-arginine uptake in erythrocytes of normal pregnant and preeclamptic women. STUDY DESIGN: Twenty-one normal pregnant and 21 preeclamptic women were studied. To measure total L-arginine uptake in erythrocytes, carbon 14 was used as a marker and Michaelis-Menten kinetic parameters (V(max) and K(m)) were evaluated. RESULTS: In preeclamptic women, there was a significant increase (P<.004) in the mean maximal capacity of transport in erythrocytes (V(max)=982.69 micromol/L cells/h+/-433.51) in comparison with normal pregnant women (V(max)=584.73 micromol/L cells/h+/-422.33). No significant difference was detected in the half-saturation constant (P=0.978). CONCLUSION: The transport kinetics of the NO precursor, L-arginine, is altered in erythrocytes of preeclamptic women. It is possible that abnormal L-arginine uptake may contribute to the pathophysiologic mechanisms of preeclampsia syndrome.


Assuntos
Arginina/metabolismo , Eritrócitos/metabolismo , Pré-Eclâmpsia/metabolismo , Gravidez/metabolismo , Adulto , Feminino , Humanos , Pré-Eclâmpsia/fisiopatologia
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