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Overview of pup in a cup model: hepatic lipogenesis in rats artificially reared on a high-carbohydrate formula
M S Patel1, S P Vadlamudi, G L Johanning
1Department of Biochemistry, Case Western Reserve University School of Medicine, Cleveland, OH 44106.
Insights
Artificial rearing in rat pups reveals early high-carbohydrate diets promote metabolic adaptations. This "metabolic imprinting" can lead to adult obesity due to increased lipogenic capacity.
Area of Science:
- Nutritional Science
- Developmental Biology
- Metabolic Research
Background:
- Artificial rearing of rat pups enables research during a previously inaccessible developmental window.
- This technique is crucial for understanding early nutrition's impact on metabolism and long-term health.
- It allows investigation of "metabolic imprinting"—permanent metabolic changes from early dietary interventions.
Purpose of the Study:
- To investigate the effects of preweaning diet composition on metabolic development in artificially reared rat pups.
- To determine if early high-carbohydrate or high-fat diets influence metabolic adaptations and long-term obesity risk.
- To identify specific metabolic markers associated with early nutritional programming.
Main Methods:
- Utilized artificial rearing technique in rat pups.
- Compared pups fed high-carbohydrate formula versus high-fat formula and naturally reared controls.
- Analyzed plasma insulin levels, hepatic lipogenic capacity, and hepatic malic enzyme activity.
Main Results:
- Artificially reared pups on high-carbohydrate formula showed higher plasma insulin levels.
- These pups also exhibited increased hepatic lipogenic capacity and precocious hepatic malic enzyme induction.
- Early high-carbohydrate exposure predisposed rats to enhanced lipogenic capacity and later obesity.
Conclusions:
- Artificial rearing is a valuable tool for studying early nutrition's metabolic effects.
- Preweaning high-carbohydrate diets induce metabolic changes that increase adult obesity susceptibility.
- Early nutrition plays a critical role in metabolic imprinting and long-term health outcomes.
Abstract:
The artificial rearing technique allows nutritional investigations to be conducted in rat pups during a critical period that previously has been inaccessible to researchers. The technique will be useful for identifying dietary components contributing to metabolic adaptations in the preweaning period as well as "metabolic imprinting" or permanent metabolic effects in adult rats resulting from early dietary intervention. Artificially reared rat pups fed a formula high in carbohydrate-derived energy in the preweaning period have the following characteristics compared with pups fed a high-fat formula or reared naturally: (i) a higher level of plasma insulin, (ii) an increased hepatic lipogenic capacity and (iii) precocious induction of hepatic malic enzyme. The results also show that early exposure to a high-carbohydrate diet in the preweaning period predisposes the rat to an increased lipogenic capacity in liver and adipose tissues and to the development of obesity later in adult life.