L-arginine metabolism in early-onset and late-onset pre-eclamptic pregnancies

Péter Tamás, József Bódis, Endre Sulyok, Gábor L. Kovács, Eszter Hantosi, Gábor Molnár, Jens Martens-Lobenhoffer, Stefanie M. Bode-Böger

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Objective. The present case-control study was undertaken to investigate l-arginine metabolism in pregnant women with early-onset and late-onset pre-eclampsia. Attempts were made to differentiate these two distinct diseases entities by using measured and derived parameters of l-arginine metabolism. Study design. Thirty-six patients with early-onset, 17 patients with late-onset pre-eclampsia and 15 healthy pregnant women at term were studied. Patients were categorized according to the weeks of gestation (< 34 vs. ≥ 34) at the appearance of clinical symptoms (hypertension + proteinuria). Venous samples were taken at gestational age of 29.8 ± 2.5, 36.1 ± 2.2 and 39.2 ± 1.2 weeks, respectively. L-arginine, asymmetric dimethylarginine (ADMA), symmetric dimethylarginine (SDMA), monomethylarginine (MMA) and l-ornithine were measured by LC-MS/MS method. L-arginine/ADMA, l-ornithine/l-arginine, ADMA/SDMA ratios and the arginine methylation index (arg-MI) were calculated. Results. Plasma levels of ADMA and MMA were significantly higher (p < 0.002) in pre-eclamptic patients than in healthy women. No significant differences could be detected between patients with early-onset and late-onset pre-eclampsia in either parameter studied. L-ornithine correlated positively with ADMA (r = 0.526, p < 0.001) and MMA (r = 0.533, p < 0.001) in the whole study population, and inversely with l-arginine (r =-0.277, p < 0.044) in the pre-eclamptic group. When compared with maternal plasma in venous cord blood l-arginine was markedly reduced (p < 0.05) and there was a significant elevation in ADMA, SDMA, MMA and l-ornithine (p < 0.001, for each) without discernible differences between the study groups. Conclusions. Parameters of l-arginine metabolism do not discriminate the early-onset from late-onset pre-eclampsia. Our study provided indirect evidences for the redirection of l-arginine-NOS to the l-arginine-arginase pathway.

Original languageEnglish
Pages (from-to)436-443
Number of pages8
JournalScandinavian Journal of Clinical and Laboratory Investigation
Volume73
Issue number5
DOIs
Publication statusPublished - Aug 1 2013

Keywords

  • Cord blood
  • L-arginine
  • L-methylarginines
  • L-ornithine
  • Pre-eclampsia

ASJC Scopus subject areas

  • Clinical Biochemistry

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