Lipoprotein profiles and glucose tolerance in lean and obese chimpanzees

Area of Science:

• Primate metabolic research
• Comparative pathology
• Biomedical research using animal models

Background:

• Obesity and metabolic disorders are significant human health concerns.
• Dietary fat content is a known factor in metabolic health.
• Chimpanzees may offer insights into human metabolic disease mechanisms.

Purpose of the Study:

• To compare serum lipid profiles and glucose tolerance in obese versus lean chimpanzees.
• To investigate metabolic abnormalities in chimpanzees on a controlled, low-fat diet.
• To assess the potential of chimpanzees as models for human metabolic diseases.

Main Methods:

• Serum lipid profiles (including low-density lipoprotein cholesterol) were analyzed.
• Glucose tolerance tests were performed.
• Obese and lean chimpanzees were maintained on a 10.9% fat diet.

Main Results:

• Hypercholesterolemia was observed in both obese (7/14) and lean (6/17) chimpanzees.
• Abnormal total cholesterol/high-density lipoprotein cholesterol ratios were found in both groups (3 obese, 3 lean).
• Abnormal glucose tolerance was present in two obese and one lean chimpanzee.

Conclusions:

• Chimpanzees can exhibit metabolic abnormalities, including hypercholesterolemia and impaired glucose tolerance, even on low-fat diets.
• Captive chimpanzees represent valuable surrogates for studying human metabolic diseases.
• These findings highlight the complexity of metabolic regulation beyond dietary fat intake.