Myeloperoxidase is critically involved in the induction of organ damage after renal ischemia reperfusion.

Abstract

In this study the role of myeloperoxidase (MPO) in a murine (C57BL/6) model of ischemia and reperfusion (I/R)-induced renal failure was investigated. The renal function after I/R was analyzed in MPO-deficient (Mpo(-/-)) mice and compared with wild-type (WT) controls. A significant reduction in renal function loss (blood urea nitrogen) was observed after 24 hours of reperfusion of ischemically damaged kidneys in Mpo(-/-) mice compared with I/R WT controls (I/R Mpo(-/-) = 31.3 +/- 1.7 mmol/L versus I/R WT = 42.8 +/- 2.1 mmol/L, sham = 7.0 +/- 0.5 mmol/L; P = 0.003). The early reperfusion phase (2 hours of reperfusion) was characterized by a substantial increase in apoptosis and early complement activation, surprisingly similar in Mpo(-/-) and WT mice. Improved renal function in Mpo(-/-) mice after extended reperfusion was accompanied by a reduced neutrophil influx (P = 0.017) compared with WT controls. Activation and deposition of complement was not significantly reduced in Mpo(-/-) mice compared with WT controls after 24 hours of reperfusion, indicating no specific in vivo role for MPO in activating complement after renal I/R. Taken together, these results demonstrated an important contribution of MPO in the induction of organ damage after renal I/R by influencing critical factors such as neutrophil extravasation but not complement activation.

• Authors: Robert A Matthijsen, Dennis Huugen, Nicole T Hoebers, Bart de Vries, Carine J Peutz-Kootstra, Yasuaki Aratani, Mohamed R Daha, Jan Willem Cohen Tervaert, Wim A Buurman, Peter Heeringa
• Journal: The American journal of pathology (Am J Pathol) Vol. 171 Issue 6 Pg. 1743-52 (Dec 2007) ISSN: 0002-9440 [Print] United States
• PMID: 18055546 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Peroxidase

Topics

• Animals
• Apoptosis (genetics)
• Complement Activation (genetics)
• Kidney Diseases (enzymology, immunology, pathology)
• Mice
• Mice, Mutant Strains
• Neutrophils (immunology)
• Peroxidase (genetics, physiology)
• Reperfusion Injury (enzymology, immunology, pathology)