Tain YL, Muller V, Szabo A, Dikalova A, Griendling K, Baylis C. Lack of long-term protective effect of antioxidant/anti-inflammatory therapy in transplant-induced ischemia/reperfusion injury.
Am J Nephrol 2006;
26:213-7. [PMID:
16720982 PMCID:
PMC2756816 DOI:
10.1159/000093587]
[Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2006] [Accepted: 04/27/2006] [Indexed: 11/19/2022]
Abstract
BACKGROUND
Alloantigen-independent factors contribute to long-term damage in renal transplant recipients, likely due to ischemia/reperfusion (I/R) injury at transplantation (Tx). I/R injury promotes oxidative stress and inflammation resulting in endothelial injury.
METHODS
In this study we investigated the long-term efficacy (22 weeks) of short-term (10 day) endothelial protection therapy (EP) in 'optimal' donor kidneys using the male Fisher 344 rat isograft (ISO) model. ISO-EP kidneys were compared to untreated ISO (ISO-UN) kidneys. EP involved dexamethasone to donor, ex vivo treatment of the kidney with deferoxamine and tempol, and administration to the recipient of L-arginine and tempol for 10 days. Rats were sacrificed 22 weeks following Tx and compared to age-matched, normal controls.
RESULTS
Both groups of ISO Tx rats developed similar renal dysfunction and structural damage and renal NADPH-oxidase-dependent O2- production was similarly elevated in ISO-UN and ISO-EP groups vs. controls. In vitro renal cortex NO synthase (NOS) activity was also similar in ISO-UN and ISO-EP rats, despite lower nNOS and eNOS protein abundance in ISO-EP.
CONCLUSION
I/R injury-induced late graft dysfunction occurs even when optimal donors are used and when short-term EP treatment is given. Increased renal superoxide production is not prevented by short-term EP therapy.
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