The urokinase-receptor in infectious diseases

Area of Science:

• Immunology
• Cell Biology
• Biochemistry

Background:

• Cell migration is vital for immune responses and pathogen defense.
• The urokinase-type plasminogen activator receptor (uPAR) is expressed on leukocytes and facilitates cell movement.
• uPAR exists in cell-surface, soluble, and cleaved forms, with elevated levels in pathologies.

Purpose of the Study:

• To review the expression and functions of various uPAR forms in infectious diseases.
• To highlight uPAR's expanded roles beyond proteolysis, including cell signaling and adhesion.

Main Methods:

• Literature review of studies on uPAR expression and function.
• Analysis of uPAR's interactions with its ligand (uPA) and vitronectin (VN).
• Examination of uPAR's involvement in cell signaling pathways.

Main Results:

• uPAR concentrates urokinase-type plasminogen activator (uPA) activity at the cell membrane, aiding extracellular matrix degradation and cell migration.
• uPAR's binding to vitronectin (VN) and association with cell surface molecules activate intracellular signaling pathways.
• These signaling pathways influence cell proliferation, survival, adhesion, and migration, crucial for immune responses.

Conclusions:

• uPAR is a critical mediator of cell migration and signaling in the context of infectious diseases.
• Understanding the diverse roles of uPAR forms is essential for developing strategies against infectious agents.