Glucosamine-induced endoplasmic reticulum dysfunction is associated with accelerated atherosclerosis in a...

Area of Science:

• Cardiovascular Biology
• Metabolic Disease Research
• Endoplasmic Reticulum Stress

Background:

• Diabetes is a significant risk factor for cardiovascular disease and stroke.
• The precise molecular mechanisms linking diabetes to vascular disease remain unclear.
• Endoplasmic reticulum (ER) stress is implicated in atherosclerosis, promoting lipid accumulation and inflammation.

Purpose of the Study:

• To investigate if intracellular glucosamine accumulation in diabetes induces ER stress and promotes atherogenesis.
• To elucidate the role of ER stress in diabetes-related lipid dysregulation and vascular disease development.

Main Methods:

• Utilized cell culture models (human aortic smooth muscle cells, monocytes, hepatocytes) to assess glucosamine-induced ER stress and lipid accumulation.
• Employed a streptozotocin-induced hyperglycemic apolipoprotein E-deficient mouse model for in vivo studies.
• Applied molecular biological and histological techniques to analyze ER stress, hepatic steatosis, and atherosclerosis progression.

Main Results:

• Glucosamine was shown to induce ER stress in relevant cell types.
• Glucosamine-induced ER stress led to dysregulated lipid metabolism and cholesterol accumulation in cultured cells.
• In vivo, hyperglycemia correlated with tissue-specific ER stress, hepatic steatosis, and accelerated atherosclerosis.

Conclusions:

• Intracellular glucosamine accumulation in diabetes may promote atherogenesis through ER stress.
• This mechanism links diabetes and hyperglycemia to accelerated atherosclerosis and lipid dysregulation.
• Targeting the ER stress pathway presents a potential therapeutic strategy for diabetic cardiovascular complications.