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• W2063669058 abstract "Resident macrophages (i.e., Kupffer cells) are derived from hematopoietic stem cells (HSCs) and are primarily responsible for the removal from plasma of oxidized forms of low-density lipoprotein (LDL). The therapeutic potential of Kupffer cell expression of a transgene encoding paraoxonase-1 (PON1), whose plasma activity correlates with the protection from atherosclerosis, was examined in mice rendered atherosclerosis-susceptible through genetic deletion of the LDL receptor. Mice having their bone marrow engrafted with HSCs expressing the PON1 transgene (PON1-Tg) driven by a macrophage-specific promoter were injected i.v. with saline (vehicle only) or with gadolinium chloride (GdCl(3)), an agent that rapidly causes Kupffer cell apoptosis. One month later, GdCl(3)-facilitated Kupffer cell apoptosis increased the hepatic expression of transgenic PON1 mRNA by 9-fold. After 12 weeks of being fed a cholesterol-enriched atherogenic diet, mice injected with GdCl(3) exhibited 50% reductions in both aortic sinus atherosclerotic lesions (P < 0.0097) and surface lesions of the abdominal aorta (P < 0.006). In contrast, mice receiving HSCs expressing the PON1-Tg but not treated with GdCl(3) showed no protection from atherosclerosis. In addition, mice engrafted with HSCs not expressing the PON1-Tg but injected with GdCl(3) also showed no protection from atherosclerosis. These findings, showing that GdCl(3)-enhanced hepatic expression of the PON1-Tg is essential for reducing atherosclerosis, indicate that Kupffer cells play an important role in atherogenesis. GdCl(3)-facilated replacement of Kupffer cells may enhance the efficacy of other HSC-based gene therapies." @default.
• W2063669058 created "2016-06-24" @default.
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• W2063669058 date "2005-07-25" @default.
• W2063669058 modified "2023-10-01" @default.
• W2063669058 title "Facilitated replacement of Kupffer cells expressing a paraoxonase-1 transgene is essential for ameliorating atherosclerosis in mice" @default.
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• W2063669058 doi "https://doi.org/10.1073/pnas.0502677102" @default.
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