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Attenuation of Kupffer Cell Activation in Cold-Preserved Livers After Pretreatment of Rats with Methylprednisolone or Its Macromolecular Prodrug

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Abstract

Purpose. Activation of hepatic Kupffer cells (KCs) during organ preservation and subsequent reperfusion causes release of proinflammatory mediators and is responsible, at least in part, for rejection of transplanted livers. Our hypothesis was that donor pretreatment, before liver harvest, with methylprednisolone (MP) or its dextran prodrug (DMP) would reduce KC activation.

Methods. Adult donor rats were administered a single 5-mg/kg (MP equivalent) IV dose of MP or DMP or saline 2 h before liver harvest. The livers were then stored in University of Wisconsin solution for 24, 48, or 96 h (n = 4/treatment/time). A recirculating perfusion model was used to study, for 180 min, the release of KC activation markers, tumor necrosis factor (TNF)-α and acid phosphatase, and other biochemical indices from the cold-preserved livers.

Results. Cold ischemia-reperfusion resulted in release of substantial levels of TNF-α in untreated groups. Pretreatment of rats with MP or DMP caused a significant (p < 0.0001) reduction in TNF-α AUC in the perfusate, with no significant differences between MP and DMP. The maximum inhibitory effect of MP (77.5 ± 10.2%) was observed after 48 h of preservation, whereas DMP showed maximal inhibition of TNF-α AUC at both 24 (74.5 ± 15.8%) and 48 (74.8 ± 12.6%) h of preservation. Similarly, both MP and DMP resulted in a significant (p < 0.0004) decrease in acid phosphatase levels of cold-preserved livers. However, neither pretreatment had any substantial effect on the levels of other biochemical markers.

Conclusions. Both MP and DMP pretreatments decreased the release of TNF-α and acid phosphatase from livers subjected to cold ischemia preservation. Therefore, pretreatment of liver donors with MP or its prodrug decreases KC activation by cold ischemia-reperfusion.

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  1. School of Pharmacy, Texas Tech University Health Sciences Center, Amarillo, Texas, 79106

    Anjaneya P. Chimalakonda & Reza Mehvar

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  1. Anjaneya P. Chimalakonda
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Chimalakonda, A.P., Mehvar, R. Attenuation of Kupffer Cell Activation in Cold-Preserved Livers After Pretreatment of Rats with Methylprednisolone or Its Macromolecular Prodrug. Pharm Res 20, 1001–1008 (2003). https://doi.org/10.1023/A:1024402121053

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