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. 2011 Nov;179(5):2431–2442. doi: 10.1016/j.ajpath.2011.07.032

Table 1.

PRG4 Protein Products

Protein product Isolation Expression Known functions
Lubricin23 Bovine synovial fluids Synoviocytes Boundary lubrication of synovial joints
Superficial zone protein (SZP)24 Bovine superficial zone articular cartilage explant culture media Superficial zone articular chondrocytes Protects superficial zone articular cartilage
Hemangiopoietin (HAPO)14 Urine of patients afflicted by aplastic anemia Unknown Supports hematopoietic and endothelial progenitor cells
Megakaryocyte stimulating factor (MSF)17 Urine of bone marrow transfer patients afflicted by acute thrombocytopenia Unknown Regulates megakaryopoiesis