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ARTICLES

Local intimal-medial uptakes of 125I-albumin, 125I-LDL, and parenteral Evans blue dye protein complex along the aortas of normocholesterolemic minipigs as predictors of subsequent hypercholesterolemic atherogenesis.

D L Fry, E E Herderick, D K Johnson
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https://doi.org/10.1161/01.ATV.13.8.1193
Arteriosclerosis, Thrombosis, and Vascular Biology. 1993;13:1193-1204
Originally published August 1, 1993
D L Fry
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E E Herderick
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D K Johnson
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Abstract

This report describes the normalized intimal-medial uptakes [uptake (M, mg.cm-2) divided serum concentration (c0, mg.cm-3)] of 125I-albumin, 125I-low-density lipoprotein (LDL), and in vivo Evans blue dye (EBD)-albumin complex as functions of pressure (P), time (t), molecular species (i), and location (z) along a ventral longitudinal z axis of the normal, intact, aortic endothelial surface in adult normocholesterolemic Sinclair Research Farm (SRF) minipigs and compares these uptake (M/c0) measurements with atherogenesis in hypercholesterolemic cohorts. Uptakes of porcine serum 125I-albumin (n = 21) and 125I-LDL (n = 10) were measured in freshly excised, metabolically supported aortas using a recently developed organ-support system. In vivo intimal-medial EBD uptake vs z data were measured photometrically on opened descending aortas from another group (n = 6) of normocholesterolemic, adult, SRF minipigs 18 hours after the intravenous administration of EBD. For comparison purposes, the corresponding incidence of atherosclerotic lesions along the aortic z axis was calculated using topographic data from hypercholesterolemic minipig cohorts (n = 39). The results showed that uptakes varied greatly with t, z, and macromolecule (i) but not with P. More specifically, the value of M/c0 at any location (z) rose with t, was insensitive to P, decreased with macromolecular (i) size, and varied with z in a pattern that "peaked" in the upstream region, decreased to a nadir in the downstream region, and then rose again as it approached the abdominal celiac orifice. The spatially z-averaged uptake rates for the three different labeled serum proteins were 0.31 x 10(-3) cm.h-1 for 125I-albumin, 0.42 x 10(-3) cm.h-1 for EBD-albumin, and 0.04 x 10(-3) cm.h-1 for 125I-LDL. Nondimensionalized analysis of the individual sets of uptake data indicated that the overall uptake relationship [M(t,P,z,i)/c(io), cm] could be characterized empirically by the simple product of two separate functions: one, a "scaling function" [m(z,i)], that described the uptake magnitude for a given i and z and appeared to be independent of t or P; the other, a "shape function" [s(t,P)], that described the shapes of the uptake vs t and P relationships and appeared to be independent of z or i. The "scaling function" [m(z,i)] vs z contour appeared to correlate well with the corresponding atherosclerotic lesion incidence vs z contour from the group of hypercholesterolemic minipig cohorts. Assuming passive transport, it was shown ("Appendix") that m(z,i) can be interpreted physically in terms of an endothelial diffusive permeability coefficient (P,cm.s-1).(ABSTRACT TRUNCATED AT 400 WORDS)

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August 1993, Volume 13, Issue 8
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    Local intimal-medial uptakes of 125I-albumin, 125I-LDL, and parenteral Evans blue dye protein complex along the aortas of normocholesterolemic minipigs as predictors of subsequent hypercholesterolemic atherogenesis.
    D L Fry, E E Herderick and D K Johnson
    Arteriosclerosis, Thrombosis, and Vascular Biology. 1993;13:1193-1204, originally published August 1, 1993
    https://doi.org/10.1161/01.ATV.13.8.1193

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    Local intimal-medial uptakes of 125I-albumin, 125I-LDL, and parenteral Evans blue dye protein complex along the aortas of normocholesterolemic minipigs as predictors of subsequent hypercholesterolemic atherogenesis.
    D L Fry, E E Herderick and D K Johnson
    Arteriosclerosis, Thrombosis, and Vascular Biology. 1993;13:1193-1204, originally published August 1, 1993
    https://doi.org/10.1161/01.ATV.13.8.1193
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