Experimental rat models to study the metabolic syndrome

Area of Science:

• Physiology
• Genetics
• Animal Models

Background:

• Metabolic syndrome is a complex condition with multifactorial origins, making it challenging to study.
• Obese Zucker rats are a common model for insulin resistance but have limitations for non-insulin-dependent diabetes mellitus and hypertension.
• Existing models require further refinement to fully recapitulate human metabolic syndrome.

Purpose of the Study:

• To review and evaluate various established and novel rat models for metabolic syndrome research.
• To identify the strengths and weaknesses of each model in mimicking human metabolic disorders.
• To guide researchers in selecting appropriate animal models for specific metabolic syndrome studies.

Main Methods:

• Literature review of experimental animal models for metabolic syndrome.
• Analysis of physiological and pathological characteristics of different rat strains.
• Comparison of established models (e.g., obese Zucker rats) with newer models (e.g., SHR sublines, transgenic rats).

Main Results:

• Obese Zucker rats exhibit insulin resistance but are questionable models for diabetes and hypertension.
• Spontaneously hypertensive rat (SHR) derivatives, like Koletsky and SHR/N-corpulent rats, offer alternative models with varying degrees of metabolic syndrome features.
• Novel models include SHRSP fatty rats, transgenic SHR, Wistar Ottawa Karlsburg W rats, and low-capacity runner rats, each presenting unique combinations of metabolic syndrome hallmarks.

Conclusions:

• No single rat model perfectly replicates human metabolic syndrome.
• Different rat models offer valuable insights into specific aspects of metabolic syndrome, such as insulin resistance, obesity, fatty liver, and hypertension.
• Ongoing development of novel genetic and transgenic rat models continues to improve the study of metabolic syndrome.