PuSH - Publikationsserver des Helmholtz Zentrums München: Loss or silencing of the PHD1 prolyl hydroxylase protects livers of mice against ischemia/reperfusion injury.

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Schneider, M.* ; van Geyte, K.* ; Fraisl, P.* ; Kiss, J.* ; Aragonés, J.* ; Mazzone, M.* ; Mairbäurl, H.* ; de Bock, K.* ; Jeoung, N.H.* ; Mollenhauer, M.* ; Georgiadou, M.* ; Bishop, T.* ; Roncal, C.* ; Sutherland, A.* ; Jordan, B.* ; Gallez, B.* ; Weitz, J.* ; Harris, R.A.* ; Maxwell, P.* ; Baes, M.* ; Ratcliffe, P.J.* ; Carmeliet, P.*

Loss or silencing of the PHD1 prolyl hydroxylase protects livers of mice against ischemia/reperfusion injury.

Gastroenterology 138, 1143-1154 (2010)

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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.

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BACKGROUND & AIMS: Liver ischemia/reperfusion (I/R) injury is a frequent cause of organ dysfunction. Loss of the oxygen sensor prolyl hydroxylase domain enzyme 1 (PHD1) causes tolerance of skeletal muscle to hypoxia. We assessed whether loss or short-term silencing of PHD1 could likewise induce hypoxia tolerance in hepatocytes and protect them against hepatic I/R damage. METHODS: Hepatic ischemia was induced in mice by clamping of the portal vessels of the left lateral liver lobe; 90 minutes later livers were reperfused for 8 hours for I/R experiments. Hepatocyte damage following ischemia or I/R was investigated in PHD1-deficient (PHD1(-/-)) and wild-type mice or following short hairpin RNA-mediated short-term inhibition of PHD1 in vivo. RESULTS: PHD1(-/-) livers were largely protected against acute ischemia or I/R injury. Among mice subjected to hepatic I/R followed by surgical resection of all nonischemic liver lobes, more than half of wild-type mice succumbed, whereas all PHD1(-/-) mice survived. Also, short-term inhibition of PHD1 through RNA interference-mediated silencing provided protection against I/R. Knockdown of PHD1 also induced hypoxia tolerance of hepatocytes in vitro. Mechanistically, loss of PHD1 decreased production of oxidative stress, which likely relates to a decrease in oxygen consumption as a result of a reprogramming of hepatocellular metabolism. CONCLUSIONS: Loss of PHD1 provided tolerance of hepatocytes to acute hypoxia and protected them against I/R-damage. Short-term inhibition of PHD1 is a novel therapeutic approach to reducing or preventing I/R-induced liver injury.

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