Effects of vagus nerve preservation and vagotomy on peptide YY and body weight after subtotal gastrectomy

AIM:To investigate the relationship between the function of vagus nerve and peptide YY 3-36 and ghrelin levels after subtotal gastrectomy.METHODS:We enrolled a total of 16 patients who underwent subtotal gastrectomy due to gastric cancer.All surgeries were performed by a single skilled surgeon.We measured peptide YY 3-36,ghrelin,leptin,insulin,growth hormone levels,and body weight immediately before and one month after surgery.RESULTS:Vagus nerve preservation group showed less body weight loss and less increase of peptide YY 3-36 compared with vagotomy group(-5.56 ± 2.24 kg vs-7.85 ± 1.57 kg,P = 0.037 and 0.06 ± 0.08 ng/mL vs 0.19 ± 0.12 ng/mL,P = 0.021,respectively).Moreover,patients with body weight loss of less than 10% exhibited reduced elevation of peptide YY 3-36 level,typically less than 20% [6(66.7%) vs 0(0.0%),P = 0.011,odd ratio = 3.333,95% confidence interval(1.293,8.591)].CONCLUSION:Vagus nerve preservation contributes to the maintenance of body weight after gastrectomy,and this phenomenon may be related to the suppressed activity of peptide YY 3-36.

Effects of Sleeve Gastrectomy Surgery with Modified Jejunoileal Bypass on Body Weight, Food Intake and Metabolic Hormone Levels of Rats

This study examined the effects of a combined surgery of sleeve gastrectomy （SG） and modified jejunoileal bypass （JIB） on the body weight, food intake, and the plasma levels of active glucagon-like peptide-1 （GLP-1） and total ghrelin of rats. Rats were divided into 3 groups in terms of different surgical protocol： SG-JIB （n=12）, SG （n=12）, JIB （n=12） and sham surgery groups （n-10）. In SG-JIB group, rats was subjected to sleeve gastrectomy and end to side anastomosis of part of the jejunum （25 cm from the ligament of Treitz） to the ileum 25 cm proximal to the cecum. The body weight and food intake were evaluated during 10 consecutive weeks postoperatively. The levels of active GLP-1 and total ghrelin in the plasma of the rats were measured by ELISA assay. The results showed that the SG-JIB treated rats relative to SG- or JIB-treated ones produced a sustained reduction in food intake and weight gain. The level of active GLP-1 was elevated and total ghrelin level decreased in SG-JIB-treated rats as compared with SG- or JIB-treated ones. It was concluded that SG-JIB could efficiently reduce the body weight and food intake, alter obesity-related hormone levels of the rats, indicating that SG-JIB may be potentially used for the treatment of obesity.