TY - JOUR
T1 - Isoform-specific effects of apolipoprotein E on atherogenesis gene transduction studies in mice
AU - Yoshida, Hiroaki
AU - Hasty, Alyssa H.
AU - Major, Amy S.
AU - Ishiguro, Hiroyuki
AU - Su, Yan Ru
AU - Gleaves, Linda A.
AU - Babaev, Vladimir R.
AU - Linton, MacRae F.
AU - Fazio, Sergio
PY - 2001/12/4
Y1 - 2001/12/4
N2 - Background-We recently used a bone marrow-based gene therapy approach to show that small amounts of retrovirus-derived human apolipoprotein E3 (apoE3) produced by macrophages are protective against early atherosclerosis in apoE-deficient mice. Methods and Results-In the present study, we evaluated whether the effect produced by macrophage-derived apoE3 is related to its ability to bind cellular membranes. To this end, we used apoE2 and apoEcys 142, dysfunctional human variants with reduced binding to the LDL receptor or to heparan sulfate proteoglycans, respectively. ApoE-deficient mice, 5 weeks of age, received transplants of apoE-/- bone marrow cells transduced with either parental retrovirus or apoE3, apoE2, or apoEcys142 retroviral vectors. Human apoE was detected by ELISA in the serum of apoE3, apoE2, and apoEcys142 mice as early as 4 weeks after bone marrow transplantation, and at 8 weeks, plasma apoE levels were 55.5±20.3, 50.5±8.7, and 15.3±7.3 μg/dL, respectively. In all groups, cholesterol levels increased with age but were not affected by apoE expression. As previously demonstrated, the lesion area in male apoE3 mice (3808±2224 μm2/section) was 40% smaller than that in control mice (6503±3475 μm2/section). In apoE2 mice, however, the lesion area was similar to that of controls (5991±2771 μm2/section), and apoEcys142 mice showed an unexpected and significant increase in lesion size (10 320±6128 μm2/section). Thus, transplantation with marrow transfected with receptor binding-defective apoE variants did not replicate the antiatherogenic effect of apoE3. Conclusions-These data provide in vivo evidence suggesting that macrophage-derived apoE delays development of atherosclerosis through a receptor-dependent pathway.
AB - Background-We recently used a bone marrow-based gene therapy approach to show that small amounts of retrovirus-derived human apolipoprotein E3 (apoE3) produced by macrophages are protective against early atherosclerosis in apoE-deficient mice. Methods and Results-In the present study, we evaluated whether the effect produced by macrophage-derived apoE3 is related to its ability to bind cellular membranes. To this end, we used apoE2 and apoEcys 142, dysfunctional human variants with reduced binding to the LDL receptor or to heparan sulfate proteoglycans, respectively. ApoE-deficient mice, 5 weeks of age, received transplants of apoE-/- bone marrow cells transduced with either parental retrovirus or apoE3, apoE2, or apoEcys142 retroviral vectors. Human apoE was detected by ELISA in the serum of apoE3, apoE2, and apoEcys142 mice as early as 4 weeks after bone marrow transplantation, and at 8 weeks, plasma apoE levels were 55.5±20.3, 50.5±8.7, and 15.3±7.3 μg/dL, respectively. In all groups, cholesterol levels increased with age but were not affected by apoE expression. As previously demonstrated, the lesion area in male apoE3 mice (3808±2224 μm2/section) was 40% smaller than that in control mice (6503±3475 μm2/section). In apoE2 mice, however, the lesion area was similar to that of controls (5991±2771 μm2/section), and apoEcys142 mice showed an unexpected and significant increase in lesion size (10 320±6128 μm2/section). Thus, transplantation with marrow transfected with receptor binding-defective apoE variants did not replicate the antiatherogenic effect of apoE3. Conclusions-These data provide in vivo evidence suggesting that macrophage-derived apoE delays development of atherosclerosis through a receptor-dependent pathway.
KW - Apolipoproteins
KW - Lipoproteins
KW - Proteoglycans
KW - Receptors
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U2 - 10.1161/hc4801.100034
DO - 10.1161/hc4801.100034
M3 - Article
C2 - 11733401
AN - SCOPUS:0035808002
SN - 0009-7322
VL - 104
SP - 2820
EP - 2825
JO - Circulation
JF - Circulation
IS - 23
ER -