Creation and preliminary characterization of a leptin knockout rat

Area of Science:

• Endocrinology
• Metabolic Research
• Animal Models

Background:

• Leptin is a key hormone regulating energy balance, appetite, and metabolism.
• Adipocyte-secreted leptin influences insulin sensitivity, fertility, immunity, and bone.
• Understanding leptin's full function requires precise genetic models.

Purpose of the Study:

• To generate the first leptin knockout rat model using zinc finger nuclease technology.
• To investigate the physiological consequences of leptin deficiency in rats.
• To establish a valuable tool for studying leptin-related diseases.

Main Methods:

• Zinc finger nuclease technology for targeted gene knockout.
• Phenotypic analysis of homozygous leptin null rats.
• Biochemical assays for serum markers (cholesterol, triglycerides, insulin).
• Fertility assessments and immune system evaluation.
• Microcomputed tomography for bone mineral density and volume analysis.

Main Results:

• Leptin null rats exhibit significant obesity.
• Elevated serum cholesterol, triglyceride, and insulin levels observed.
• Complete infertility in both male and female knockout rats.
• Impaired immune system function in leptin-deficient rats.
• Increased trabecular bone mineral density and bone volume in femurs.

Conclusions:

• Leptin is essential for regulating body weight, reproduction, immune function, and bone metabolism.
• The leptin knockout rat is a robust model for studying obesity, diabetes, infertility, and bone diseases.
• This model will advance research in metabolic disorders and skeletal health.