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Diabetic Retinopathy

Diabetic Retinopathy

DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...

Diabetic Neuropathy

Diabetic Neuropathy

DefinitionDiabetic neuropathy is nerve damage caused by long-standing diabetes mellitus. It results directly from prolonged high blood sugar levels.PathophysiologyThe pathophysiology of diabetic neuropathy involves both metabolic and vascular disturbances triggered by chronic hyperglycemia.Metabolic injury: Elevated glucose levels activate the polyol pathway within nerve cells, leading to the accumulation of sorbitol and fructose. This increases oxidative stress, disrupts normal nerve...

Diabetic Nephropathy

Diabetic Nephropathy

Definition Diabetic nephropathy is a chronic kidney complication that results from prolonged hyperglycemia.Prevalence It is the most common cause of chronic kidney disease (CKD) and end-stage renal disease (ESRD) worldwide, affecting up to half of individuals with diabetes.Pathophysiology • Sustained hyperglycemia triggers multiple hemodynamic and metabolic changes in the kidney. • Early in the disease, increased renal blood flow and glomerular hyperfiltration...

Type II Diabetes II: Pathophysiology

Type II Diabetes II: Pathophysiology

PathophysiologyType 2 diabetes mellitus (T2DM ) is a chronic metabolic disorder characterized by insulin resistance and progressive pancreatic β-cell dysfunction, leading to impaired glucose homeostasis. It results from interactions among genetic predisposition, environmental factors, and metabolic stressors, such as overnutrition and a sedentary lifestyle.Insulin Resistance and Glucose DysregulationEarly T2DM involves insulin resistance in skeletal muscle, adipose tissue, and the liver.

Type I Diabetes II: Pathophysiology

Type I Diabetes II: Pathophysiology

Type 1 diabetes mellitus arises from an immune-mediated destruction of pancreatic β-cells, resulting in an absolute deficiency of insulin. This process develops in genetically susceptible individuals when autoimmunity, environmental exposures, and immunologic dysregulation converge to trigger a targeted attack on the insulin-producing cells of the pancreas. The β-cells are located within the islets of Langerhans and are essential for regulating blood glucose by facilitating cellular...

Pathophysiology of Diabetes

Pathophysiology of Diabetes

Diabetes mellitus is a chronic metabolic disorder characterized by hyperglycemia. The four categories of diabetes are type 1 diabetes, type 2 diabetes, other specific types of diabetes, and gestational diabetes.
Type 1 diabetes is characterized by autoimmune-mediated destruction of pancreatic β cells, with environmental factors potentially triggering this process in genetically susceptible individuals. Despite many not having a family history, certain genes increase susceptibility,...

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Author Spotlight: Understanding Retinal Vessel Resilience and Disease Progression

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Diabetic retinopathy--biomolecules and multiple pathophysiology.

¹Department of Biochemistry, Faculty of Dentistry, Jamia Millia Islamia, Okhla, New Delhi 110025, India.

Diabetes & Metabolic Syndrome

|December 3, 2014

Summary

Diabetic retinopathy (DR) is a leading cause of blindness globally. Effective management of blood sugar, blood pressure, and lipids is crucial for preventing DR progression and vision loss.

Keywords:

AGE Diabetic retinopathy Glutamate PKC ROS Retina

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Area of Science:

Ophthalmology
Diabetology
Vascular Biology

Background:

Diabetic retinopathy (DR) is a significant complication of diabetes, leading to blindness worldwide.
DR results from long-term damage to retinal small blood vessels, with clinical symptoms appearing years after onset.
Hyperglycemia triggers metabolic stresses implicated in DR pathophysiology.

Purpose of the Study:

To review the biochemical changes and contributing factors in the pathogenesis of diabetic retinopathy.
To highlight the role of inflammation and neurodegeneration in DR development.

Main Methods:

Review of existing literature on diabetic retinopathy.
Analysis of biochemical pathways affected by hyperglycemia in the retina.

Main Results:

Hyperglycemia induces retinal microvascular changes, including activation of protein kinase C (PKC), advanced glycation end-products (AGEs) formation, polyol pathway activation, and oxidative stress.
Inflammation and neurodegeneration are increasingly recognized as key players in DR pathogenesis.

Conclusions:

Glycemic control, blood pressure management, and lipid-lowering therapies are vital for reducing DR incidence and progression.
Understanding the complex interplay of metabolic, inflammatory, and neurodegenerative pathways is essential for future DR treatments.