Epidermal vascular endothelial growth factor production is required for permeability barrier homeostasis, dermal angiogenesis, and the development of epidermal hyperplasia: implications for the pathogenesis of psoriasis.
Primary abnormalities in permeability barrier function appear to underlie atopic dermatitis and epidermal trauma; a concomitant barrier dysfunction could also drive other inflammatory dermatoses, including psoriasis. Central to this outside-inside view of disease pathogenesis is the epidermal generation of cytokines/growth factors, which in turn signal downstream epidermal repair mechanisms. Yet, this cascade, if sustained, signals downstream epidermal hyperplasia and inflammation. We found here that acute barrier disruption rapidly stimulates mRNA and protein expression of epidermal vascular endothelial growth factor-A (VEGF-A) in normal hairless mice, a specific response to permeability barrier requirements because up-regulation is blocked by application of a vapor-impermeable membrane. Moreover, epidermal vegf(-/-) mice display abnormal permeability barrier homeostasis, attributable to decreased VEGF signaling of epidermal lamellar body production; a paucity of dermal capillaries with reduced vascular permeability; and neither angiogenesis nor epidermal hyperplasia in response to repeated tape stripping (a model of psoriasiform hyperplasia). These results support a central role for epidermal VEGF in the maintenance of epidermal permeability barrier homeostasis and a link between epidermal VEGF production and both dermal angiogenesis and the development of epidermal hyperplasia. Because psoriasis is commonly induced by external trauma [isomorphic (Koebner) phenomenon] and is associated with a prominent permeability barrier abnormality, excess VEGF production, prominent angiogenesis, and epidermal hyperplasia, these results could provide a potential outside-inside mechanistic basis for the development of psoriasis.
Elias
Peter M
PM
Dermatology Service (190), VA Medical Center, 4150 Clement St., San Francisco, CA 94121, USA. eliasp@derm.ucsf.edu
Arbiser
Jack
J
Brown
Barbara E
BE
Rossiter
Heidemarie
H
Man
Mao-Qiang
MQ
Cerimele
Francesca
F
Crumrine
Debra
D
Gunathilake
Roshan
R
Choi
Eung Ho
EH
Uchida
Yoshikazu
Y
Tschachler
Erwin
E
Feingold
Kenneth R
KR
D000818:Animals; D015152:Blotting, Northern; D020405:Dermis / Q000098:blood supply / Q000378:metabolism; D004817:Epidermis / Q000378:metabolism* / Q000473:pathology*; D006706:Homeostasis / Q000502:physiology*; D006965:Hyperplasia; D007150:Immunohistochemistry; D008297:Male; D051379:Mice; D008812:Mice, Hairless; D018345:Mice, Knockout; D009389:Neovascularization, Pathologic / Q000378:metabolism*; D010539:Permeability; D011565:Psoriasis / Q000503:physiopathology*; D042461:Vascular Endothelial Growth Factor A / Q000096:biosynthesis*
D042461:Vascular Endothelial Growth Factor A