The Dynamic Platelet Transcriptome in Obesity and Weight Loss

Area of Science:

• Cardiovascular Science
• Metabolic Disease Research
• Platelet Biology

Background:

• Adiposity links to oxidative stress, inflammation, and glucose intolerance.
• Platelet gene expression correlates with cardiometabolic phenotypes like body mass index.
• Platelet gene expression changes with metabolic shifts, like weight reduction, are not well understood.

Purpose of the Study:

• To investigate platelet gene expression changes following massive weight loss.
• To determine if weight loss impacts platelet function.
• To explore associations between platelet gene expression and cardiometabolic phenotypes.

Main Methods:

• Platelet RNA sequencing and aggregation in 21 individuals post-bariatric surgery.
• Quantitative reverse transcription quantitative PCR for 67 genes in 1864 Framingham Heart Study participants.
• Linear regression models to assess associations with cardiometabolic phenotypes.

Main Results:

• Massive weight loss induced significant differential expression of many platelet transcripts, some specific to platelets.
• Differentially expressed genes were enriched for nonalcoholic fatty liver disease pathways.
• Platelet aggregation function did not change post-weight loss.
• Several platelet genes showed modest associations with body mass index.

Conclusions:

• Significant weight loss causes substantial transcriptional shifts in human platelets.
• These shifts implicate pathways potentially relevant to improved cardiometabolic risk.
• Platelet function (aggregation) is not altered by significant weight loss.