Related Experiment Video
Updated: Jun 7, 2025
04:36
Author Spotlight: Understanding Retinal Vessel Resilience and Disease Progression
Published on: January 12, 2024
1.0K
Diabetes Renders Photoreceptors Susceptible to Retinal Ischemia-Reperfusion Injury
David A Antonetti1,2, Cheng-Mao Lin1, Sumathi Shanmugam1
1Department of Ophthalmology and Visual Sciences, University of Michigan, Michigan Medicine, Kellogg Eye Center, Ann Arbor, Michigan, United States.
Investigative Ophthalmology & Visual Science
|November 21, 2024
Summary
Diabetes significantly increases susceptibility of photoreceptors to retinal ischemic injury. Pretreatment with a sodium-glucose co-transporter inhibitor reversed these damaging effects, suggesting diabetes-induced photoreceptor damage is reversible.
Area of Science:
- Ophthalmology
- Endocrinology
- Neuroscience
Background:
- Diabetes mellitus is associated with diabetic retinopathy (DR) pathology.
- Photoreceptors (PR) are implicated in DR, but their response to retinal ischemic injury in diabetes is not fully understood.
Purpose of the Study:
- To investigate the impact of diabetes on retinal ischemic injury.
- To evaluate the protective effect of sodium-glucose co-transporter (SGLT1/2) inhibition on diabetes-induced retinal damage.
Main Methods:
- Type 1 (streptozotocin-induced) and type 2 (BKS db/db) diabetic mice underwent retinal ischemia-reperfusion (IR) injury.
- Retinal neurodegeneration was assessed via layer thinning, TUNEL staining, and neuron loss.
- Vascular permeability and the effect of phlorizin (SGLT1/2 inhibitor) were examined.
Main Results:
- Diabetic retinas showed significant outer retinal thinning, photoreceptor loss, and inner segment length reduction after IR injury compared to controls.
- Diabetes delayed blood-retinal barrier restoration post-IR.
- Phlorizin pretreatment markedly reduced IR-induced outer retinal thinning (from 49% to 3%).
Conclusions:
- Diabetes renders photoreceptors highly vulnerable to ischemic injury.
- The protective effect of phlorizin suggests that diabetes-related photoreceptor damage is reversible.
Related Concept Videos
01:22Photoreceptors and Visual Pathways
5.7K
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
5.7K
01:20Pathophysiology of Diabetes
868
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,...
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,...
868
01:22Diabetes Mellitus: Overview and Type I Subtype
2.4K
Diabetes mellitus is a chronic metabolic disorder characterized by high blood glucose levels due to inadequate insulin production, insulin resistance, or both. The condition affects millions worldwide and can significantly impact their health and quality of life.
Type 1 diabetes is an autoimmune disease in which the immune system mistakenly attacks and destroys the insulin-producing beta cells in the pancreas. As a result, the body is unable to produce sufficient insulin, and individuals with...
Type 1 diabetes is an autoimmune disease in which the immune system mistakenly attacks and destroys the insulin-producing beta cells in the pancreas. As a result, the body is unable to produce sufficient insulin, and individuals with...
2.4K
01:22Diabetes Mellitus: Type 2 and Gestational
2.2K
Type 2 diabetes, characterized by insulin resistance, arises when the insulin receptors on cells lose responsiveness to insulin, diminishing the cell's capacity to take up glucose, resulting in elevated blood glucose levels. To receive a diagnosis of Type 2 diabetes, a series of blood glucose tests are necessary to assess whether the blood glucose falls within normal parameters. If the result is out of the normal range, a patient may be diagnosed as prediabetic or diabetic, depending on the...
2.2K