Isolation and characterization of peritoneal microvascular pericytes

Area of Science:

• Cell Biology
• Biomedical Engineering
• Nephrology

Background:

• Pericytes are implicated as a source of myofibroblasts in human peritoneal fibrosis.
• Previous studies on primary vascular pericyte culture primarily focused on cerebral and retinal microvasculature.

Purpose of the Study:

• To establish a reproducible method for isolating and characterizing mouse peritoneal microvascular pericytes.
• To provide a tool for in vitro studies of peritoneal fibrosis.

Main Methods:

• Isolation of mouse peritoneal microvascular pericytes from mesenteric tissues using enzymatic digestion (collagenase II, DNase I).
• Culturing cells in pericyte-conditioned medium after initial attachment.
• Purification using magnetic activated cell sorting (MACS).

Main Results:

• Achieved high purity (99.0%) of primary peritoneal pericytes.
• Characterized cells morphologically (triangular/polygonal) and confirmed purity via positive staining for PDGFR-β, α-SMA, NG2, and CD13.
• Demonstrated pericyte function in promoting endothelial tube formation and pericyte-myofibroblast transition upon TGF-β1 stimulation.

Conclusions:

• A reproducible protocol for isolating primary mouse peritoneal pericytes was successfully developed.
• These isolated pericytes serve as a valuable tool for in vitro research into peritoneal fibrosis mechanisms.
• The findings contribute to understanding the role of pericytes in peritoneal fibrosis, particularly in the context of peritoneal dialysis.