Microvascular COX-2/mPGES-1/EP-4 axis in human abdominal aortic aneurysm
Por:
Camacho, M, Dilme, J, Sola-Villa, D, Rodriguez, C, Bellmunt, S, Siguero, L, Alcolea, S, Romero, JM, Escudero, JR, Martinez-Gonzalez, J, Vila, L
Publicada:
1 dic 2013
Resumen:
We investigated the prostaglandin (PG)E-2 pathway in human abdominal aortic aneurysm (AAA) and its relationship with hypervascularization. We analyzed samples from patients undergoing AAA repair in comparison with those from healthy multiorgan donors. Patients were stratified according to maximum aortic diameter: low diameter (LD) (<55 mm), moderate diameter (MD) (55-69.9 mm), and high diameter (HD) (>= 70 mm). AAA was characterized by abundant microvessels in the media and adventitia with perivascular infiltration of CD45-positive cells. Like endothelial cell markers, cyclooxygenase (COX)-2 and the microsomal isoform of prostaglandin E synthase (mPGES-1) transcripts were increased in AAA (4.4- and 1.4-fold, respectively). Both enzymes were localized in vascular cells and leukocytes, with maximal expression in the LD group, whereas leukocyte markers display a maximum in the MD group, suggesting that the upregulation of COX-2/mPGES-1 precedes maximal leukocyte infiltration. Plasma and in vitro tissue secreted levels of PGE(2) metabolites were higher in AAA than in controls (plasma-controls, 19.9 +/- 2.2; plasma-AAA, 38.8 +/- 5.5 pg/ml; secretion-normal aorta, 16.5 +/- 6.4; secretion-AAA, 72.9 +/- 6.4 pg/mg; mean +/- SEM). E-prostanoid receptor (EP)-2 and EP-4 were overexpressed in AAA, EP-4 being the only EP substantially expressed and colocalized with mPGES-1 in the microvasculature. Additionally, EP-4 mediated PGE(2)-induced angiogenesis in vitro. We provide new data concerning mPGES-1 expression in human AAA.jlr Our findings suggest the potential relevance of the COX-2/mPGES-1/EP-4 axis in the AAA-associated hypervascularization.
Filiaciones:
Camacho, M:
Inst Biomed Res II B St Pau, Angiol Vasc Biol & Inflammat Lab, Barcelona, Spain
Dilme, J:
Inst Biomed Res II B St Pau, Angiol Vasc Biol & Inflammat Lab, Barcelona, Spain
Inst Biomed Res II B St Pau, Dept Vasc Surg, Barcelona, Spain
Sola-Villa, D:
Autonomous Univ Barcelona, Barcelona, Spain
Rodriguez, C:
Inst Biomed Res II B St Pau, Cardiovasc Res Ctr CSIC ICCC, Barcelona, Spain
Bellmunt, S:
Inst Biomed Res II B St Pau, Angiol Vasc Biol & Inflammat Lab, Barcelona, Spain
Inst Biomed Res II B St Pau, Dept Vasc Surg, Barcelona, Spain
Siguero, L:
Inst Biomed Res II B St Pau, Angiol Vasc Biol & Inflammat Lab, Barcelona, Spain
Alcolea, S:
Inst Biomed Res II B St Pau, Angiol Vasc Biol & Inflammat Lab, Barcelona, Spain
Romero, JM:
Inst Biomed Res II B St Pau, Angiol Vasc Biol & Inflammat Lab, Barcelona, Spain
Inst Biomed Res II B St Pau, Dept Vasc Surg, Barcelona, Spain
Escudero, JR:
Inst Biomed Res II B St Pau, Angiol Vasc Biol & Inflammat Lab, Barcelona, Spain
Inst Biomed Res II B St Pau, Dept Vasc Surg, Barcelona, Spain
Martinez-Gonzalez, J:
Inst Biomed Res II B St Pau, Cardiovasc Res Ctr CSIC ICCC, Barcelona, Spain
Vila, L:
Inst Biomed Res II B St Pau, Angiol Vasc Biol & Inflammat Lab, Barcelona, Spain
Green Published, Hybrid Gold
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