Abstract
Background
The pathogenesis of renal disease in the context of overweight/obesity, metabolic syndrome, and insulin resistance is not completely understood. This may be due to the lack of a definitive animal model of disease, which limits our understanding of obesity-induced renal damage. We evaluated the changes in renal histology and lipid deposits induced by obesity in a model of insulin resistance: the Iberian swine fed with fat-enriched food.
Methods
Twenty-eight female sows were randomized to standard (SD) or high-fat diet (HFD: 6.8% of saturated fat) for 100 days. Weight, adiposity, analytics, oral glucose tolerance tests, and measured renal function were determined. Renal histology and lipid deposits in renal tissue were analyzed.
Results
Animals on HFD developed obesity, hypertension, high levels of LDL cholesterol, triglycerides, insulin resistance, and glomerular hyperfiltration. No animal developed overt diabetes. Animals on HFD showed “diabetoid changes”, including mesangial expansion [21.40% ± 4 vs.13.20% ± 4.0, p < 0.0001], nodular glomerulosclerosis [7.40% ± 7, 0.75 vs. 2.40% ± 4.7, p = 0.02], and glomerulomegaly (18% vs. 10%, p = 0.010) than those on SD. Tubular atrophy, interstitial fibrosis, inflammation, arteriolar hyalinosis, or fibrointimal thickening were mild and similar between groups. Triglyceride content in renal tissue was higher in animals on HFD than in SD (15.4% ± 0.5 vs. 12.7% ± 0.7; p < 0.01).
Conclusions
Iberian pigs fed with fat-enriched food showed diabetoid changes and glomerulomegaly as observed in obese humans making this model suitable to study obesity-induced renal disease.
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Acknowledgements
The authors thank the INIA farm staff for their assistance with animal care and handling. CGC, MVG, SA, and AGB are members of the EU COST-Action BM1308 “Sharing Advances on Large Animal Models (SALAAM)”. The authors would like to acknowledge the DIABESITY working group of the ERA-EDTA. the IMBRAIN (CIBICAN) project (FP7-RE6-POT- 2012-CT2012-31637-IMBRAIN) funded under the 7th Framework Program (capacities); the Instituto de Salud Carlos III (ISCIII) for the following grants: PI13/00342, PI, PI16/01814, the REDINREN RD16/0009 and PI10/02428; funding from the IRSIN (Instituto Reina Sofia de Investigacion), FEDER funds, SLL is a research fellow supported by the Instituto de Salud Carlos III (Grants for Río Hortega specialized healthcare post training contracts), ISCIII CM15/00214, Spain; EP is a Researcher of the Ramón y Cajal Program of the ISCIII. EP and AGB are the guarantors of the study.
Funding
The IMBRAIN (CIBICAN) project (FP7-RE6-POT-2012-CT2012-31637-IMBRAIN) 329 funded under the 7th Framework Program (capacities); the Instituto de Salud Carlos 330 III (ISCIII) for the following grants: PI13/00342, PI, PI16/01814, the REDINREN RD16/0009 and PI10/02428; funding from the IRSIN (Instituto Reina Sofia de Investigacion), FEDER funds, SLL is a research fellow supported by the Instituto de Salud Carlos III (Grants for Río Hortega specialized healthcare post training contracts), ISCIII CM15/00214, Spain; EP is a Researcher of the Ramón y Cajal Program of the ISCIII.
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AGB and EP had the idea of the study; RRR and JG performed the histological analysis, CGC, MVG, JLP, and BI helped in the performance of the study, AERR, ESR, and JDC helped in the histological evaluation, SLL performed the plasma clearance of iohexol.
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Rodríguez, R.R., González-Bulnes, A., Garcia-Contreras, C. et al. The Iberian pig fed with high-fat diet: a model of renal disease in obesity and metabolic syndrome. Int J Obes 44, 457–465 (2020). https://doi.org/10.1038/s41366-019-0434-9
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DOI: https://doi.org/10.1038/s41366-019-0434-9
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