Apolipoprotein A5 and hypertriglyceridemia in Prague hypertriglyceridemic rats

Area of Science:

• Genetics
• Metabolic Syndrome
• Cardiovascular Disease Risk Factors

Background:

• High plasma triglyceride (TG) levels are a significant risk factor for coronary heart disease.
• The Apolipoprotein A5 (Apoa5) gene influences plasma TG concentrations in humans and mice.
• Prague hereditary hypertriglyceridemic (HTG) rats serve as a model for human hypertriglyceridemia and metabolic syndrome.

Purpose of the Study:

• To investigate the role of the Apoa5 gene variation and expression in HTG rats.
• To compare Apoa5 in HTG rats with normotriglyceridemic Lewis and Wistar rat controls.
• To assess Apoa5's response to chronic fructose loading in HTG rats.

Main Methods:

• Screening of Apoa5 gene coding regions and intron-exon boundaries in HTG rats and controls.
• Quantification of Apoa5 gene expression under basal conditions and after fructose loading.
• Measurement of plasma TG levels in HTG rats and controls.

Main Results:

• No mutations in the Apoa5 gene were found in HTG rats compared to controls.
• Basal Apoa5 expression was lower in HTG rats across all age groups.
• Chronic fructose loading significantly increased plasma TG in HTG rats but did not alter Apoa5 expression.

Conclusions:

• Apoa5 gene variation is not the genetic determinant of hypertriglyceridemia in HTG rats.
• The lack of Apoa5 expression changes during fructose-induced TG elevation suggests it does not play a major compensatory role.