The normal cellular prion protein and its possible role in angiogenesis.
Cellular Prion Protein (PrPc) is a ubiquitous glycoprotein present on the surface of endothelial cells. Resting vascular endothelial cells show minimum expression of PrPc and can constitutively release PrPc. PrPc participates in cell survival, differentiation and angiogenesis. During development, neonatal brain endothelial cells transiently express PrPc. Our group recently reported upregulation of PrPc in microvessels from ischemic brain regions in stroke patients. Ischemia/hypoxia induces PrPc expression through the activation of extracellular signal-regulated kinase (ERK). All these data suggest that PrPc plays an important role in angiogenic responses. In addition, PrPc participates in cellular function in the central nervous system, since PrPc is also highly expressed in neurons. PrPc binds copper, suggesting a role in copper metabolism. PrPc also protects cells against oxidative stress and it seems to be involved in neuroprotection. Several studies have demonstrated that PrPc prevents cells from apoptosis and subsequent tissue damage. Moreover, PrPc plays an important role in the immune response. Here, we review the multiple functions of PrPc with a special attention to its recently reported role in angiogenesis.
Turu
Marta
M
Department of Neurology, University Hospital of Bellvitge, Fundacio IDIBELL, Barcelona, Spain.
Slevin
Mark
M
Ethirajan
Priya
P
Luque
Ana
A
Elasbali
AbdulBaset
A
Font
Angels
A
Gaffney
John
J
Cairols
Marc
M
Kumar
Pat
P
Kumar
Shant
S
Krupinski
Jerzy
J
D000818:Animals; D001921:Brain / Q000166:cytology / Q000502:physiology*; D002470:Cell Survival; D003300:Copper / Q000378:metabolism; D004730:Endothelium, Vascular / Q000166:cytology / Q000502:physiology; D006706:Homeostasis; D006801:Humans; D008024:Ligands; D009474:Neurons / Q000166:cytology / Q000502:physiology; D018384:Oxidative Stress; D018621:PrPC Proteins / Q000235:genetics / Q000378:metabolism*; D012016:Reference Values; D015398:Signal Transduction; D013569:Synapses / Q000502:physiology; D015032:Zinc / Q000378:metabolism
D008024:Ligands; D018621:PrPC Proteins; D003300:Copper; D015032:Zinc