Gastric Bypass Improves Obesity and Glucose Tolerance Independent of Gastric Pouch Size.

Abstract

PURPOSE:

We investigated whether metabolic phenotype improvements following gastric bypass are associated with gastric resection strategy in high-fat diet-induced obese (DIO) mice.

MATERIALS AND METHODS:

We developed the mouse Roux-en-Y gastric bypass (RYGB) model with different gastric pouch sizes: (i) RYGB with a large gastric pouch (RYGB-LP), where the stomach was transected, and the jejunum was anastomosed to the residual forestomach, in which 30% of the stomach is retained. (ii) RYGB with a small remnant gastric pouch (RYGB-SP), where the stomach was transected 0.8 cm distal to the esophagogastric junction, and the jejunum is attached to a small remnant of the forestomach (~ 10% of the stomach). (iii) RYGB without gastric pouch (RYGB-NP), where the jejunum is anastomosed to the lower portion of the esophagus.

RESULTS:

Surgical success rate (or 4-week mouse survival rate) of the RYGB-LP, RYGB-SP, and RYGB-NP procedures was 50, 75, and 85%, respectively. Our data demonstrate that all RYGB procedures improved body weight, glucose tolerance, and liver steatosis, compared with untreated DIO mice at 8-week post-surgery. Major surgical complication, such as obstruction at the forestomach, occurred predominantly in RYGB-LP mice, resulting in a higher mortality. Pre- and post-prandial plasma ghrelin levels did not correlate with improved metabolic phenotype after gastric bypass.

CONCLUSIONS:

We conclude that RYGB with different gastric pouch equally improves obesity and glucose tolerance independent of gastric pouch size and total plasma ghrelin levels in the mouse model of RYGB surgery.

• Authors: Rui Xu, Chenyu Zhu, Joseph F Pierre, Deng Ping Yin
• Journal: Obesity surgery (Obes Surg) Vol. 30 Issue 5 Pg. 1635-1641 (05 2020) ISSN: 1708-0428 [Electronic] United States
• PMID: 31927685 (Publication Type: Journal Article, Research Support, N.I.H., Extramural)

Chemical References

• Blood Glucose
• Glucose

Topics

• Animals
• Blood Glucose
• Gastric Bypass
• Glucose
• Mice
• Obesity (surgery)
• Obesity, Morbid (surgery)
• Stomach (surgery)