Influence of catgut implantation at acupoints on leptin and insulin resistance in simple obesity rats

Objectives

To investigate the influence of catgut implantation at acupoints on leptin resistance (LR) and insulin resistance (IR) in the simple obesity rat.

Methods

Rats were made obese with high-fat diets, after which surgical catgut was implanted at Zusanli (ST 36) and Neiting (ST 44) acupoints once a week for 4 weeks (implantation group). Rats from the implantation group were compared with normal rats and unoperated obese rats (control group). Gene expression of the leptin receptor (OB-R) was evaluated using RT-PCR and northern blot. Serum and hypothalamus leptin and insulin (INS) levels were determined by radioimmunoassay. Body weight, Lee's index, body fat, serum and hypothalamus leptin and INS levels, and hypothalamic OB-R gene expression were determined before and after treatment.

Results

Body weights, Lee's index, body fat, and serum leptin and INS levels were significantly higher in obese than in normal rats. Hypothalamic leptin and INS levels and OB-R gene expression were significantly lower in obese rats. Catgut implantation at acupoint promoted weight loss and decreased serum leptin and INS levels. Hypothalamic leptin and INS levels and OB-R gene expression increased significantly.

Conclusions

Catgut implantation at acupoint adjusts central and peripheral leptin and promotes hypothalamic OB-R gene expression. This may be an important method for regulation of LR, IR and abnormal endocrinology and metabolism.