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• W2019810313 abstract "Metabolic disturbances in diabetes mellitus include changes in the type and concentration of lipids in the blood plasma which may contribute to the development of diabetic retinopathy. This disease is characterized by changes in retinal blood flow secondary to changes in the tone of retinal arterioles which is regulated by compounds such as adenosine, adenosine triphosphate (ATP), the glutamate agonist N-methyl-d-aspartate (NMDA) and prostaglandin E2 (PGE2). However, the relation between increased plasma low density lipoprotein (LDL) and tone regulation in retinal resistance vessels has not been studied in detail. Twelve male and nine female Yucatan minipigs overexpressing a gain-of-function mutant (D374Y) of the human gene PCSK9 that blocks LDL transport into the liver and twelve wild-type males were studied. The animals were fed a cholesterol rich diet from the age of 60 days, followed by induction of diabetes mellitus in twelve of the transgenic animals. The animals were sacrificed at a mean age of 51 weeks (range 26–60 weeks), followed by inspection and histological examination of retinal vessels, and examination of the changes in vascular tone induced by adenosine, ATP, NMDA and PGE2. In the transgenic pigs without diabetes mellitus ATP-induced relaxation was reduced in isolated arterioles, and a whitish infiltration in an arteriole was observed in 4/8 (50%) of the animals, whereas these changes were not found in the other groups. Histological examination of one of the infiltrations showed staining with Oil Red O representing foamy cells sub-endothelially in the vascular wall indicating atheromatosis. Adenosine, ATP and PGE2 induced a significant concentration-dependent relaxation of retinal arterioles in all groups. The presence of perivascular retinal tissue had no effect on the relaxing effect of adenosine, but increased the relaxing effect of ATP and PGE2 in the two transgenic animal groups, whereas NMDA had no significant effect on vascular tone in any of the groups. Relaxation of porcine retinal arterioles exposed to hypercholesterolemia in vivo is modified by hepatic LDL-receptor deficiency and diabetes mellitus. This suggests that transgenic animal models are suitable for studying the influence of systemic diseases on retinal vascular function." @default.
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• W2019810313 date "2013-10-01" @default.
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• W2019810313 title "Relaxation of porcine retinal arterioles exposed to hypercholesterolemia in vivo is modified by hepatic LDL-receptor deficiency and diabetes mellitus" @default.
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• W2019810313 doi "https://doi.org/10.1016/j.exer.2013.06.013" @default.
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