Retinopathy in a novel model of metabolic syndrome and type 2 diabetes: new insight on the inflammatory paradigm

ABSTRACT The pathogenesis of diabetic retinopathy (DR) in metabolic syndrome (MetS) and type 2 diabetes (T2D) is not well studied, partly because an appropriate model has not been developed. Recently, we introduced a novel model of spontaneous T2D and MetS that replicates the relevant features of th...

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Veröffentlicht in:The FASEB journal 2014-05, Vol.28 (5), p.2038-2046
Hauptverfasser: Noda, Kousuke, Nakao, Shintaro, Zandi, Souska, Sun, Dawei, Hayes, K. C., Hafezi‐Moghadam, Ali
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container_issue 5
container_start_page 2038
container_title The FASEB journal
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creator Noda, Kousuke
Nakao, Shintaro
Zandi, Souska
Sun, Dawei
Hayes, K. C.
Hafezi‐Moghadam, Ali
description ABSTRACT The pathogenesis of diabetic retinopathy (DR) in metabolic syndrome (MetS) and type 2 diabetes (T2D) is not well studied, partly because an appropriate model has not been developed. Recently, we introduced a novel model of spontaneous T2D and MetS that replicates the relevant features of the human disease. In the current study, we investigated the retinal vascular changes in these animals. Experimental DR in streptozotocin (STZ)‐injected rodents is described as an inflammatory disease, in which intercellular adhesion molecule 1 (ICAM‐1) plays a key role. In comparison, advanced diabetes (HbA1c>10%) in the Nile grass rat (NGR) was associated with lower ICAM‐1 protein expression when compared with that in normal or moderately diabetic animals. Vascular cell adhesion molecule 1 (VCAM‐1) expression, however, was unaffected by the disease state. As opposed to the STZ‐induced model of DR, in diabetic NGRs, most leukocytes accumulated in the retinal arteries. Consistent with the ICAM‐1 reduction, leukocyte accumulation was significantly reduced in advanced disease. Similarly, leukocyte adhesions were significantly lower, with elevated plasma triglycerides (>200 mg/dl), and cholesterol (>240 mg/dl). However, these adhesions were significantly higher in animals with higher plasma insulin (>5 μIU/ml) and leptin (>20 ng/ml), suggesting a role for these hormones in diabetic retinal leukostasis. Diabetic NGRs showed substantial retinal endothelial injury, primarily in the microvessels, including vascular tortuosity, obliterated acellular capillaries, and pericyte ghosts. The NGR provides a convenient and realistic model for investigation of retinal changes in MetS/T2D with convincing advantages over the commonly used STZ‐induced T1D.—Noda, K., Nakao, S., Zandi, S., Sun, D., Hayes, K. C., Hafezi‐Moghadam, A. Retinopathy in a novel model of metabolic syndrome and type 2 diabetes: new insight on the inflammatory paradigm. FASEB J. 28, 2038–2046 (2014). www.fasebj.org
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Vascular cell adhesion molecule 1 (VCAM‐1) expression, however, was unaffected by the disease state. As opposed to the STZ‐induced model of DR, in diabetic NGRs, most leukocytes accumulated in the retinal arteries. Consistent with the ICAM‐1 reduction, leukocyte accumulation was significantly reduced in advanced disease. Similarly, leukocyte adhesions were significantly lower, with elevated plasma triglycerides (&gt;200 mg/dl), and cholesterol (&gt;240 mg/dl). However, these adhesions were significantly higher in animals with higher plasma insulin (&gt;5 μIU/ml) and leptin (&gt;20 ng/ml), suggesting a role for these hormones in diabetic retinal leukostasis. Diabetic NGRs showed substantial retinal endothelial injury, primarily in the microvessels, including vascular tortuosity, obliterated acellular capillaries, and pericyte ghosts. The NGR provides a convenient and realistic model for investigation of retinal changes in MetS/T2D with convincing advantages over the commonly used STZ‐induced T1D.—Noda, K., Nakao, S., Zandi, S., Sun, D., Hayes, K. C., Hafezi‐Moghadam, A. Retinopathy in a novel model of metabolic syndrome and type 2 diabetes: new insight on the inflammatory paradigm. 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C.</creatorcontrib><creatorcontrib>Hafezi‐Moghadam, Ali</creatorcontrib><title>Retinopathy in a novel model of metabolic syndrome and type 2 diabetes: new insight on the inflammatory paradigm</title><title>The FASEB journal</title><addtitle>FASEB J</addtitle><description>ABSTRACT The pathogenesis of diabetic retinopathy (DR) in metabolic syndrome (MetS) and type 2 diabetes (T2D) is not well studied, partly because an appropriate model has not been developed. Recently, we introduced a novel model of spontaneous T2D and MetS that replicates the relevant features of the human disease. In the current study, we investigated the retinal vascular changes in these animals. Experimental DR in streptozotocin (STZ)‐injected rodents is described as an inflammatory disease, in which intercellular adhesion molecule 1 (ICAM‐1) plays a key role. In comparison, advanced diabetes (HbA1c&gt;10%) in the Nile grass rat (NGR) was associated with lower ICAM‐1 protein expression when compared with that in normal or moderately diabetic animals. Vascular cell adhesion molecule 1 (VCAM‐1) expression, however, was unaffected by the disease state. As opposed to the STZ‐induced model of DR, in diabetic NGRs, most leukocytes accumulated in the retinal arteries. Consistent with the ICAM‐1 reduction, leukocyte accumulation was significantly reduced in advanced disease. Similarly, leukocyte adhesions were significantly lower, with elevated plasma triglycerides (&gt;200 mg/dl), and cholesterol (&gt;240 mg/dl). However, these adhesions were significantly higher in animals with higher plasma insulin (&gt;5 μIU/ml) and leptin (&gt;20 ng/ml), suggesting a role for these hormones in diabetic retinal leukostasis. Diabetic NGRs showed substantial retinal endothelial injury, primarily in the microvessels, including vascular tortuosity, obliterated acellular capillaries, and pericyte ghosts. The NGR provides a convenient and realistic model for investigation of retinal changes in MetS/T2D with convincing advantages over the commonly used STZ‐induced T1D.—Noda, K., Nakao, S., Zandi, S., Sun, D., Hayes, K. C., Hafezi‐Moghadam, A. Retinopathy in a novel model of metabolic syndrome and type 2 diabetes: new insight on the inflammatory paradigm. 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C.</au><au>Hafezi‐Moghadam, Ali</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Retinopathy in a novel model of metabolic syndrome and type 2 diabetes: new insight on the inflammatory paradigm</atitle><jtitle>The FASEB journal</jtitle><addtitle>FASEB J</addtitle><date>2014-05</date><risdate>2014</risdate><volume>28</volume><issue>5</issue><spage>2038</spage><epage>2046</epage><pages>2038-2046</pages><issn>0892-6638</issn><eissn>1530-6860</eissn><abstract>ABSTRACT The pathogenesis of diabetic retinopathy (DR) in metabolic syndrome (MetS) and type 2 diabetes (T2D) is not well studied, partly because an appropriate model has not been developed. Recently, we introduced a novel model of spontaneous T2D and MetS that replicates the relevant features of the human disease. In the current study, we investigated the retinal vascular changes in these animals. Experimental DR in streptozotocin (STZ)‐injected rodents is described as an inflammatory disease, in which intercellular adhesion molecule 1 (ICAM‐1) plays a key role. In comparison, advanced diabetes (HbA1c&gt;10%) in the Nile grass rat (NGR) was associated with lower ICAM‐1 protein expression when compared with that in normal or moderately diabetic animals. Vascular cell adhesion molecule 1 (VCAM‐1) expression, however, was unaffected by the disease state. As opposed to the STZ‐induced model of DR, in diabetic NGRs, most leukocytes accumulated in the retinal arteries. Consistent with the ICAM‐1 reduction, leukocyte accumulation was significantly reduced in advanced disease. Similarly, leukocyte adhesions were significantly lower, with elevated plasma triglycerides (&gt;200 mg/dl), and cholesterol (&gt;240 mg/dl). However, these adhesions were significantly higher in animals with higher plasma insulin (&gt;5 μIU/ml) and leptin (&gt;20 ng/ml), suggesting a role for these hormones in diabetic retinal leukostasis. Diabetic NGRs showed substantial retinal endothelial injury, primarily in the microvessels, including vascular tortuosity, obliterated acellular capillaries, and pericyte ghosts. The NGR provides a convenient and realistic model for investigation of retinal changes in MetS/T2D with convincing advantages over the commonly used STZ‐induced T1D.—Noda, K., Nakao, S., Zandi, S., Sun, D., Hayes, K. C., Hafezi‐Moghadam, A. Retinopathy in a novel model of metabolic syndrome and type 2 diabetes: new insight on the inflammatory paradigm. FASEB J. 28, 2038–2046 (2014). www.fasebj.org</abstract><cop>United States</cop><pub>Federation of American Societies for Experimental Biology</pub><pmid>24571922</pmid><doi>10.1096/fj.12-215715</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record>
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subjects adhesion molecules
adipokines
Adiponectin - metabolism
Animals
Blood-Retinal Barrier - metabolism
Cell Adhesion
Diabetes Complications - pathology
Diabetes Mellitus, Type 2 - pathology
Diabetic Retinopathy - pathology
Disease Models, Animal
Female
Glycated Hemoglobin A - metabolism
Inflammation - pathology
Insulin - blood
Intercellular Adhesion Molecule-1 - metabolism
Leptin - blood
Leukocytes - cytology
Lipids - blood
Male
Metabolic Syndrome - complications
Nile grass rat
Rats
Research Communications
Retina - metabolism
Retinal Vessels - metabolism
Streptozocin
Triglycerides - metabolism
Vascular Cell Adhesion Molecule-1 - metabolism
title Retinopathy in a novel model of metabolic syndrome and type 2 diabetes: new insight on the inflammatory paradigm
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