Microarray and functional cluster analysis implicates transforming growth factor beta1 in endothelial cell...

Area of Science:

• Molecular Biology
• Vascular Biology
• Trauma Research

Background:

• Massive hemorrhage from trauma induces tissue hypoxia and inflammation, injuring vascular endothelium.
• Endothelial cell pathophysiology in trauma is known, but gene transcriptional changes remain unclear.
• Microarray analysis was used to investigate endothelial gene expression during trauma-induced dysfunction.

Purpose of the Study:

• To elucidate critical gene pathways and products involved in endothelial dysfunction following trauma-hemorrhage/shock.
• To identify early transcriptional changes in aortic endothelium after trauma-hemorrhage/shock.

Main Methods:

• A trauma-hemorrhage/shock (T-H/S) swine model was utilized, involving 35% blood volume hemorrhage and 6-hour resuscitation.
• Aortic endothelium was analyzed using fluorescent microarray.
• Functional clustering of gene transcripts was performed using DAVID software.

Main Results:

• The T-H/S model induced acidosis, coagulopathy, and ischemia/reperfusion injury.
• Microarray analysis revealed 1007 down-regulated and 529 up-regulated transcripts.
• Functional clustering identified 21 altered biological processes, with the transforming growth factor beta (TGFβ) family and vascular endothelial growth factor (VEGF) signaling members showing significant alterations.

Conclusions:

• Early transcriptional changes in endothelial cells during shock-trauma involve TGFβ and VEGF signaling pathways.
• TGFβ and VEGF signaling are implicated in endothelial cell injury and increased vascular permeability in shock-trauma.
• These findings highlight potential therapeutic targets for mitigating trauma-induced endothelial dysfunction.