High-fat diet protects BB/OK rats from developing type 1 diabetes

Area of Science:

• Endocrinology
• Metabolic Research
• Diabetes Pathogenesis

Background:

• Lipid metabolism is crucial in early type 1 diabetes (T1D) development.
• BioBreeding/Ottawa Kalsburg (BB/OK) rats spontaneously develop insulin-dependent T1D.
• Investigating factors influencing lipid metabolism in BB/OK rats is essential for understanding T1D.

Purpose of the Study:

• To examine the influence of a high-fat diet on lipid metabolism in BB/OK rats.
• To assess the impact of diet on T1D incidence and adipose tissue gene expression.
• To determine if dietary interventions can modulate T1D development in a preclinical model.

Main Methods:

• BB/OK female rats were fed a high-fat diet during pregnancy and lactation.
• Progeny were maintained on the high-fat diet until 30 or 4 weeks of age.
• Gene expression of key metabolic genes (Pparg, Fasn, Lep, Adipoq, Repin1, Rarres 2, Glut4) was analyzed in adipose tissue.

Main Results:

• High-fat diet significantly decreased T1D frequency in BB/OK rats (71% vs. 95% in controls, p=0.002).
• This protective effect was significant in males (68% vs. 100%, p=0.003) but not females (73% vs. 90%, p=0.23).
• The diet reduced mRNA expression of most examined genes in subcutaneous adipose tissue, with exceptions in visceral tissue.

Conclusions:

• A high-fat diet demonstrates a sex-specific protective effect against T1D development in BB/OK rats.
• The findings suggest that dietary fat influences fat accumulation and metabolism, potentially preventing T1D in males.
• Changes in adipose tissue gene expression support the role of diet in modulating T1D pathogenesis.