Altered metabolisms of mediators controlling vascular function and enhanced oxidative stress in asymptomatic children with congenital portosystemic venous shunt

Hironori Nagasaka, Yoshiyuki Okano, Madoka Aizawa, Takashi Miida, Tohru Yorifuji, Go Tajima, Nobuo Sakura, Tomozumi Takatani, Yoshitami Sanayama, Kenji Sugamoto, Mitsufumi Mayumi, Kunihiko Kobayashi, Kenichi Hirano, Masaki Takayanagi, Hirokazu Tsukahara

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6 Citations (Scopus)

Abstract

Children with congenital portosystemic venous shunt (PSVS) are at risk for developing pulmonary hypertension, irrespective of the severity of portal hypertension or liver damage. Altered metabolisms of nitric oxide (NO) and endothelin-1 (ET-1), which are linked with oxidative stress and control vascular tone, might contribute to the vascular disturbance. This study examined 14 children (aged 1-5 years) with congenital PSVS lacking major liver damage and portal hypertension. Serum levels of nitrite/nitrate (NOx) as stable metabolites of NO, and of asymmetric dimethylarginine (ADMA) as an endogenous NO synthase inhibitor were determined, along with the plasma level of ET-1. Oxidative stress, which might affect the production of such mediators, was also examined using specific urinary and blood markers. The NOx levels were significantly lower in affected children than in the age-matched control group, although ET-1 levels were significantly higher than the control levels. In the affected children, the ADMA levels and ADMA/NOx ratios were higher, respectively, by 30% and 130% and showed significant positive correlations with the shunt ratios. Oxidative stress markers, including plasma thiobarbiturate reactive substances and urinary acrolein-lysine and 8-hydroxy-2′-deoxyguanosine, were significantly higher in affected children than in the control group, consistent with them being subjected to enhanced oxidative stress. These results suggest the presence of altered metabolisms of vascular mediators and enhanced oxidative stress in asymptomatic preschool children with congenital PSVS.

Original languageEnglish
Pages (from-to)107-113
Number of pages7
JournalMetabolism: Clinical and Experimental
Volume59
Issue number1
DOIs
Publication statusPublished - Jan 2010
Externally publishedYes

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

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    Nagasaka, H., Okano, Y., Aizawa, M., Miida, T., Yorifuji, T., Tajima, G., Sakura, N., Takatani, T., Sanayama, Y., Sugamoto, K., Mayumi, M., Kobayashi, K., Hirano, K., Takayanagi, M., & Tsukahara, H. (2010). Altered metabolisms of mediators controlling vascular function and enhanced oxidative stress in asymptomatic children with congenital portosystemic venous shunt. Metabolism: Clinical and Experimental, 59(1), 107-113. https://doi.org/10.1016/j.metabol.2009.07.013