Decreased miR-150 in obesity-associated type 2 diabetic mice increases intraocular inflammation and exacerbates retinal dysfunction
| Autor: | Gladys Y-P Ko, Beiyan Zhou, Fei Yu, Michael Lee Ko, Dylan Luc Pham, Samantha Chapman |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
obesity
medicine.medical_specialty Normal diet Endocrinology Diabetes and Metabolism Mice Obese Inflammation Type 2 diabetes Diseases of the endocrine glands. Clinical endocrinology Diabetes Mellitus Experimental Pathogenesis Mice 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Internal medicine Diabetes mellitus medicine Animals Pathophysiology/Complications 030304 developmental biology 0303 health sciences Retina business.industry Retinal Diabetic retinopathy RC648-665 medicine.disease MicroRNAs diabetic retinopathy medicine.anatomical_structure Endocrinology Diabetes Mellitus Type 2 chemistry diabetes mellitus 030221 ophthalmology & optometry medicine.symptom business Type 2 blindness |
| Zdroj: | BMJ Open Diabetes Research & Care, Vol 8, Iss 1 (2020) BMJ Open Diabetes Research & Care |
| ISSN: | 2052-4897 |
| Popis: | IntroductionDiabetic retinopathy (DR) is the leading cause of blindness among the working population in the USA. Current therapies, including anti-vascular endothelial growth factor treatments, cannot completely reverse the visual defects induced by DR. MicroRNA-150 (miR-150) is a regulator that suppresses inflammation and pathological angiogenesis. In patients with diabetes, miR-150 is downregulated. As chronic inflammation is a major contributor to the pathogenesis of DR, whether diabetes-associated decrease of miR-150 is merely associated with the disease progression or decreased miR-150 causes retinal inflammation and pathological angiogenesis is still unknown.Research design and methodsWe used high-fat diet (HFD)-induced type 2 diabetes (T2D) in wild type (WT) and miR-150 knockout (miR-150-/-) mice for this study and compared retinal function and microvasculature morphology.ResultsWe found that WT mice fed with an HFD for only 1 month had a significant decrease of miR-150 in the blood and retina, and retinal light sensitivity also decreased. The miR-150-/-mice on the HFD developed diabetes similar to that of the WT. At 7–8 months old, miR-150-/-mice under normal diet had increased degeneration of retinal capillaries compared with WT mice, indicating that miR-150 is important in maintaining the structural integrity of retinal microvasculature. Deletion of miR-150 worsened HFD-induced retinal dysfunction as early as 1 month after the diet regimen, and it exacerbated HFD-induced T2DR by further increasing retinal inflammation and microvascular degeneration.ConclusionThese data suggest that decreased miR-150 caused by obesity or diabetic insults is not merely correlated to the disease progression, but it contributes to the retinal dysfunction and inflammation, as well as the development of DR. |
| Databáze: | OpenAIRE |
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