描述:
Plateletderived growth factor (PDGF) family of mesenchymal mitogenic factors consists
of four homodimers (PDGFAA, PDGFBB, PDGFCC and PDGFDD) and one heterodimer
(PDGFAB). These proteins are expressed by a number of different cells and tissues including
endothelial cells, epithelial cells, hematopoietic cells, connective tissue, nervous tissue,
brain, muscle, kidney and liver. PDGF expression is highly regulated with PDGF levels
increasing following injury and/or disease. An analysis of PDGF purified from human platelets
suggest that approximately 70% of seraderived PDGF is PDGFAB.PDGF isoforms exert their
cellular effect by binding to the structurally similar receptor tyrosine kinases PDGF receptorα
and PDGF receptorβ. PDGFAB binding induces receptor dimerization resulting in αα receptor
homodimers and αβ receptor heterodimers. Binding of PDGF receptors has been reported to
result in stimulation of mitogenicity and chemotaxis of fibroblasts, stimulation of granule
release by neutrophils and monocytes, facilitation of steroid synthesis by Leydig cells,
stimulation of neutrophil phagocytosis, stimulation of collagen, fibronectin, proteoglycan,
and hyaluronic acid synthesis, modulation of thrombospondin expression and secretion,
stimulation of collagenase activity and secretion, induction of contraction of rat aorta strips
in vitro, and transient induction of T cell IL2 secretion accompanied by a downregulation
of IL4 and IFNγ production.
原厂资料:
Plateletderived growth factor (PDGF) family of mesenchymal mitogenic factors consists
of four homodimers (PDGFAA, PDGFBB, PDGFCC and PDGFDD) and one heterodimer
(PDGFAB). These proteins are expressed by a number of different cells and tissues including
endothelial cells, epithelial cells, hematopoietic cells, connective tissue, nervous tissue,
brain, muscle, kidney and liver. PDGF expression is highly regulated with PDGF levels
increasing following injury and/or disease. An analysis of PDGF purified from human platelets
suggest that approximately 70% of seraderived PDGF is PDGFAB.PDGF isoforms exert their
cellular effect by binding to the structurally similar receptor tyrosine kinases PDGF receptorα
and PDGF receptorβ. PDGFAB binding induces receptor dimerization resulting in αα receptor
homodimers and αβ receptor heterodimers. Binding of PDGF receptors has been reported to
result in stimulation of mitogenicity and chemotaxis of fibroblasts, stimulation of granule
release by neutrophils and monocytes, facilitation of steroid synthesis by Leydig cells,
stimulation of neutrophil phagocytosis, stimulation of collagen, fibronectin, proteoglycan,
and hyaluronic acid synthesis, modulation of thrombospondin expression and secretion,
stimulation of collagenase activity and secretion, induction of contraction of rat aorta strips
in vitro, and transient induction of T cell IL2 secretion accompanied by a downregulation
of IL4 and IFNγ production.