Changes in Blood microRNA Expression and Early Metabolic Responsiveness 21 Days Following Bariatric Surgery

Area of Science:

• Molecular Biology
• Endocrinology
• Metabolic Surgery

Background:

• Early metabolic improvements after bariatric surgery exceed expectations based on initial weight loss.
• These metabolic changes coincide with significant improvements in type 2 diabetes.
• The role of small non-coding microRNAs (miRNAs) in these early responses is largely unknown.

Purpose of the Study:

• To investigate if microRNA expression changes contribute to early metabolic regulation and weight loss post-bariatric surgery.
• To identify specific microRNAs and their associated pathways involved in diabetes remission after Roux-en-Y gastric bypass (RYGB).

Main Methods:

• Twenty-nine patients with severe obesity and type 2 diabetes underwent RYGB.
• Clinical data and blood samples were collected preoperatively and 21 days postoperatively.
• MicroRNA expression was analyzed using quantitative polymerase chain reaction (qPCR) to identify significant changes.

Main Results:

• A 3.8 kg/m² decrease in BMI was observed within 21 days post-surgery.
• Sixty-two percent (18/29) of patients achieved short-term diabetes remission.
• Seven microRNAs (miR-7-5p, let-7f-5p, miR-15b-5p, let-7i-5p, miR-320c, miR-205-5p, miR-335-5p) showed significant expression changes, associated with diabetes and insulin resistance pathways.

Conclusions:

• Significant alterations in seven specific microRNAs occur within 21 days after bariatric surgery.
• These microRNAs are linked to pathways involved in diabetes, pituitary, and liver function.
• The findings suggest a potential mechanistic role for these microRNAs in the rapid diabetes response observed post-bariatric surgery.