TY - JOUR
T1 - Tumor necrosis factor-α receptor p75 is required in ischemia-induced neovascularization
AU - Goukassian, David A.
AU - Qin, Gangjian
AU - Dolan, Christine
AU - Murayama, Toshinori
AU - Silver, Marcy
AU - Curry, Cynthia
AU - Eaton, Elizabeth
AU - Luedemann, Corinne
AU - Ma, Hong
AU - Asahara, Takayuki
AU - Zak, Victor
AU - Mehta, Shanu
AU - Burg, Aaron
AU - Thorne, Tina
AU - Kishore, Raj
AU - Losordo, Douglas W.
PY - 2007/2
Y1 - 2007/2
N2 - BACKGROUND - Aging is a risk factor for coronary and peripheral artery disease. Tumor necrosis factor-α (TNF-α), a proinflammatory cytokine, is expressed in ischemic tissue and is known to modulate angiogenesis. Little is known about the role of TNF-α receptors (TNFR1/p55 and TNFR2/p75) in angiogenic signaling. METHODS AND RESULTS - We studied neovascularization in the hindlimb ischemia model in young and old TNFR2/p75 knockout (p75KO) and wild-type age-matched controls. Between days 7 to 10 after hindlimb surgery, 100% of old p75KOs experienced autoamputation of the operated limbs, whereas none of the age-matched wild-type mice exhibited hindlimb necrosis. Poor blood flow recovery in p75KO mice was associated with increased endothelial cell apoptosis, decreased capillary density, and significant reductions in the expression of vascular endothelial growth factor and basic fibroblast growth factor-2 mRNA transcripts in ischemic tissue and in circulating endothelial progenitor cells. The number of circulating bone marrow-derived endothelial progenitor cells was significantly reduced in p75KO mice. Transplantation of wild-type bone marrow mononuclear cells into irradiated old p75KO mice 1 month before hindlimb surgery prevented limb loss. CONCLUSIONS - Our present study suggests that ischemia-induced endothelial progenitor cell-mediated neovascularization is dependent, at least in part, on p75 TNF receptor expressed in bone marrow-derived cells. Specifically, endothelial cell/endothelial progenitor cell survival, vascular endothelial growth factor expression, endothelial progenitor cell mobilization from bone marrow, endothelial progenitor cell differentiation, and ultimately ischemia-induced collateral vessel development are dependent on signaling through TNFR2/p75. Furthermore, because TNFR2/p75 becomes an age-related limiting factor in postischemic recovery, it may be a potential gene target for therapeutic interventions in adult vascular diseases.
AB - BACKGROUND - Aging is a risk factor for coronary and peripheral artery disease. Tumor necrosis factor-α (TNF-α), a proinflammatory cytokine, is expressed in ischemic tissue and is known to modulate angiogenesis. Little is known about the role of TNF-α receptors (TNFR1/p55 and TNFR2/p75) in angiogenic signaling. METHODS AND RESULTS - We studied neovascularization in the hindlimb ischemia model in young and old TNFR2/p75 knockout (p75KO) and wild-type age-matched controls. Between days 7 to 10 after hindlimb surgery, 100% of old p75KOs experienced autoamputation of the operated limbs, whereas none of the age-matched wild-type mice exhibited hindlimb necrosis. Poor blood flow recovery in p75KO mice was associated with increased endothelial cell apoptosis, decreased capillary density, and significant reductions in the expression of vascular endothelial growth factor and basic fibroblast growth factor-2 mRNA transcripts in ischemic tissue and in circulating endothelial progenitor cells. The number of circulating bone marrow-derived endothelial progenitor cells was significantly reduced in p75KO mice. Transplantation of wild-type bone marrow mononuclear cells into irradiated old p75KO mice 1 month before hindlimb surgery prevented limb loss. CONCLUSIONS - Our present study suggests that ischemia-induced endothelial progenitor cell-mediated neovascularization is dependent, at least in part, on p75 TNF receptor expressed in bone marrow-derived cells. Specifically, endothelial cell/endothelial progenitor cell survival, vascular endothelial growth factor expression, endothelial progenitor cell mobilization from bone marrow, endothelial progenitor cell differentiation, and ultimately ischemia-induced collateral vessel development are dependent on signaling through TNFR2/p75. Furthermore, because TNFR2/p75 becomes an age-related limiting factor in postischemic recovery, it may be a potential gene target for therapeutic interventions in adult vascular diseases.
KW - Angiogenesis
KW - Collateral circulation
KW - Cytokines
KW - Endothelium
KW - Ischemia
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UR - http://www.scopus.com/inward/citedby.url?scp=33847117670&partnerID=8YFLogxK
U2 - 10.1161/CIRCULATIONAHA.106.647255
DO - 10.1161/CIRCULATIONAHA.106.647255
M3 - Article
C2 - 17261656
AN - SCOPUS:33847117670
SN - 0009-7322
VL - 115
SP - 752
EP - 762
JO - Circulation
JF - Circulation
IS - 6
ER -
