Hypertriglyceridemia in Ehrlich ascites carcinomatous mice: tumor and mouse strain differences

Area of Science:

• Biomedical Research
• Cancer Biology
• Lipid Metabolism

Background:

• Ehrlich ascites carcinoma (EAC) is known to induce hypertriglyceridemia in mice.
• Discrepancies exist in reported levels of hypertriglyceridemia and fasting effects on tumor triglyceride levels between laboratories.
• Investigating these discrepancies is crucial for understanding EAC-induced metabolic changes.

Purpose of the Study:

• To investigate the influence of mouse strain and tumor subline on hypertriglyceridemia induced by Ehrlich ascites carcinoma.
• To compare triglyceride levels and fasting responses in different mouse strains bearing EAC.
• To identify factors contributing to variations in lipid metabolism during tumor growth.

Main Methods:

• Simultaneous study of tumorous CBA mice from Spector's laboratory and Swiss-Webster mice.
• Determination of triglyceride levels in plasma and tumor extracellular fluid.
• Controlled crossover groups to evaluate mouse and tumor strain influences.
• Assessment of adipose tissue weights (epididymal, inguinal, intermuscular fat) in response to tumor growth and fasting.

Main Results:

• CBA mice exhibited intense hypertriglyceridemia and high tumor extracellular fluid triglyceride levels, irrespective of tumor subline.
• Swiss-Webster mice showed only mild hyperlipidemia with both tumor strains.
• Fasting decreased plasma and tumor extracellular fluid triglyceride concentrations in both CBA and Swiss-Webster mice.
• CBA mice showed significant adipose tissue reduction with tumor growth, unlike Swiss-Webster mice.

Conclusions:

• Variations in hypertriglyceridemia and tumor triglyceride levels are primarily due to mouse strain differences, not tumor subline.
• Mouse strain significantly influences the response to fasting concerning triglyceride levels.
• Strain-specific alterations in adipose tissue during tumor growth suggest distinct metabolic regulatory mechanisms.