Journal
JOURNAL OF CLINICAL INVESTIGATION
Volume 107, Issue 4, Pages 419-430Publisher
AMER SOC CLINICAL INVESTIGATION INC
DOI: 10.1172/JCI8797
Keywords
-
Categories
Funding
- NCRR NIH HHS [P41 RR000954] Funding Source: Medline
- NHLBI NIH HHS [P01 HL030568] Funding Source: Medline
- NIA NIH HHS [AG-08487, AG-12293, AG-15013, R01 AG008487] Funding Source: Medline
- NIDDK NIH HHS [P01 DK002456] Funding Source: Medline
Ask authors/readers for more resources
Myeloperoxidase (MPO), a heme enzyme secreted by activated phagocytes, generates an array of oxidants proposed to play critical roles in host defense and local tissue damage, Both MPO and its reaction products are present in human atherosclerotic plaque, and it has been proposed that MPO oxidatively modifies targets in the artery wall. We have now generated MPO-deficient mice, and show here that neutrophils from homozygous mutants lack peroxidase and chlorination activity in vitro and fail to generate chlorotyrosine or to kill Candida albicans in vivo. To examine the potential role of MPO in atherosclerosis, we subjected LDL receptor-deficient mice to lethal irradiation, repopulated their marrow with MPO-deficient or wild-type cells, and provided them a high-fat, high-cholesterol diet for 14 weeks. White cell counts and plasma lipoprotein profiles were similar between the two groups at sacrifice, Cross-sectional analysis of the aorta indicated that lesions in MPO-deficient mice were about 50% larger than controls, Similar results were obtained in a genetic cross with LDL receptor-deficient mice. In contrast to advanced human atherosclerotic lesions, the chlorotyrosine content of aortic lesions from wild-type as well as MPO-deficient mice was essentially undetectable, These data suggest an unexpected, protective role for MPO-generated reactive intermediates in murine atherosclerosis, They also identify an important distinction between murine and human atherosclerosis with regard to the potential involvement of MPO in protein oxidation.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available