Peritoneal Dialysis Fluid and Some of Its Components Potentiate Fibrocyte Differentiation

Area of Science:

• Nephrology
• Cell Biology
• Pathology

Background:

• Long-term peritoneal dialysis (PD) is associated with peritoneal fibrosis.
• Fibrocytes, a monocyte-derived cell type, are implicated in fibrotic diseases.
• The role of fibrocytes in PD-associated peritoneal fibrosis is not fully understood.

Purpose of the Study:

• To investigate the presence and role of fibrocytes in peritoneal fibrosis.
• To determine if PD fluid influences fibrocyte differentiation.
• To identify components of PD fluid that may contribute to peritoneal fibrosis.

Main Methods:

• Analysis of peritoneal tissue from short-term and long-term PD patients.
• In vitro studies using human fibrocytes and PD fluid (Dianeal).
• Assessment of the effects of PD fluid components, including sodium lactate and sodium chloride, on fibrocyte differentiation and serum amyloid P (SAP) inhibition.

Main Results:

• Fibrocytes are significantly more abundant in peritoneal tissue from long-term PD patients compared to short-term PD patients.
• PD fluid enhances human fibrocyte differentiation in vitro.
• Sodium lactate in PD fluid is implicated as a key factor potentiating fibrocyte differentiation.
• PD fluid and sodium chloride reduce the inhibitory effect of serum amyloid P on fibrocyte differentiation.

Conclusions:

• PD fluid contributes to the development of peritoneal fibrosis.
• The potentiation of fibrocyte differentiation by PD fluid, particularly sodium lactate, and the reduced efficacy of SAP inhibition play a role in PD-associated peritoneal fibrosis.