Basic fibroblast growth factor synthesis by human peritoneal mesothelial cells: induction by interleukin-1

Area of Science:

• Cell Biology
• Molecular Biology
• Immunology

Background:

• Peritoneal mesothelial cells (HPMCs) are crucial for regulating peritoneal cavity events.
• HPMCs are a significant source of cytokines and growth factors.
• Basic fibroblast growth factor (bFGF) plays a role in cellular processes.

Purpose of the Study:

• To investigate the capacity of human peritoneal mesothelial cells (HPMCs) to synthesize and release basic fibroblast growth factor (bFGF).
• To characterize the regulation of bFGF synthesis and release by inflammatory cytokines.
• To assess the role of HPMCs in abdominal disease processes.

Main Methods:

• Quantification of bFGF synthesis and release using specific immunoassays.
• Treatment of HPMCs with inflammatory cytokines (IL-1beta, TNF-alpha, IFN-gamma).
• Analysis of bFGF mRNA levels and immunohistochemical staining of peritoneal tissue.

Main Results:

• HPMCs constitutively synthesize and release significant amounts of bFGF, primarily intracellularly.
• Interleukin-1beta (IL-1beta) significantly increases bFGF production and release from HPMCs.
• IL-1beta up-regulates bFGF mRNA levels, while TNF-alpha and IFN-gamma have no effect.
• In situ expression of bFGF is pronounced in activated HPMCs in areas of serosal inflammation.

Conclusions:

• Human peritoneal mesothelial cells (HPMCs) are a significant source of basic fibroblast growth factor (bFGF).
• The pro-inflammatory cytokine IL-1beta potently up-regulates bFGF synthesis and release by HPMCs.
• HPMCs are key regulators in abdominal disease pathogenesis, including peritonitis and peritoneal fibrosis.