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The transplanted liver graft is capable of clearing asymmetric dimethylarginine
Author(s) -
Siroen Michiel P.C.,
Warlé Michiel C.,
Teerlink Tom,
Nijveldt Robert J.,
Kuipers Ernst J.,
Metselaar Herold J.,
Tilanus Hugo W.,
Kuik Dirk J.,
van der Sijp Joost R.M.,
Meijer Sybren,
van der Hoven Ben,
van Leeuwen Paul A.M.
Publication year - 2004
Publication title -
liver transplantation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.814
H-Index - 150
eISSN - 1527-6473
pISSN - 1527-6465
DOI - 10.1002/lt.20286
Subject(s) - asymmetric dimethylarginine , medicine , liver transplantation , transplantation , gastroenterology , endocrinology , arginine , nitric oxide , biochemistry , chemistry , amino acid
Asymmetric dimethylarginine (ADMA) has been recognized as an endogenous inhibitor of the arginine–nitric oxide (NO) pathway. Its concentration is tightly regulated by urinary excretion and degradation by the enzyme dimethylarginine dimethylaminohydrolase (DDAH), which is highly expressed in the liver. Considering the liver as a crucial organ in the clearing of ADMA, we hypothesized increased ADMA levels during hepatic failure and, consequently, a decline of ADMA concentrations after successful liver transplantation. The aim of the present study was to investigate the role of the liver in the metabolism of ADMA in patients undergoing liver transplantation. In this prospective study, we investigated the course of ADMA concentrations in 42 patients undergoing liver transplantation and results showed that preoperative ADMA concentrations were higher in patients with acute (1.26 μmol/L, P < .001) and in patients with chronic (.69 μmol/L, P < .001) hepatic failure compared with healthy volunteers (.41 μmol/L). In addition, ADMA concentrations decreased from the preoperative day to the first postoperative day in both the acute (Δ ADMA : −.63 μmol/L, P = .005) and the chronic hepatic failure group (Δ ADMA : −0.15 μmol/L, P < .001). Furthermore, in patients who experienced acute rejection, ADMA concentrations were higher during the whole first postoperative month compared with nonrejectors ( P = .012). Moreover, in 11 of 13 rejectors (85%) a clear increase in ADMA concentration preceded the onset of the first episode of rejection, which was confirmed by liver biopsy. In conclusion, our results indicate that the transplanted liver graft is quickly capable of clearing ADMA, suggesting preservation of DDAH. In addition, increased ADMA concentrations in the posttransplantation period reflect serious dysfunction of the liver graft during acute rejection. (Liver Transpl 2004;10:1524–1530.)