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Pubmed ID :8623164
Publication Date : //

Cardiac allograft vasculopathy. Preferential regulation of endothelial cell-derived mesenchymal growth factors in response to a donor-specific cell-mediated allogeneic response.


We have previously reported that cell-mediated immunity to vascular endothelium is associated with the development of cardiac allograft vasculopathy (CAV). The mechanism by which a cell-mediated immune response to the coronary vascular is translated into the development of CAV is, however unknown. Peripheral blood mononuclear cells (PBMCs) obtained serially following cardiac transplantation were cocultured with donor-specific human aortic endothelial cells (HAECs) in 47 allograft recipients, 9 of whom had CAV (CAV+) at 1 year by angiography. At 20 hr following coculture, HAEC poly (A+) RNA was isolated, reverse-transcribed, and the cDNA-amplified (PCR) for a panel of growth factors (GFs) known to alter smooth muscle cell proliferation or migration. Relative quantitation of PCR product was performed using high-pressure liquid chromatography (HPLC). Three patterns of GF regulation were observed depending on the GF, the time posttransplant, and whether the patient had CAV: (1) no regulation (TGF-beta, PDGF-A early post-tx); (2) upregulation irrespective of CAV (bFGF, PDGF-B, TGF-alpha early post-tx); and (3) preferential or exclusive upregulation by CAV+ patients (PDGF-A and TGF-alpha late post-tx, HB-EGF early and late post-tx). For example, using PBMCs as stimulators, obtained 6 months posttransplant from CAV+ patients, increases in HAEC-derived PDGF-A chain (31 +/- 7 to 69 +/- 11), TGF-alpha (97 +/- 27 to 201 +/- 23), and HB-EGF (78 +/- 16 to 173 +/- 27) mRNA were demonstrated (all P<0.05 or greater using HPLC peak area as units). These data demonstrate that cell-mediated activation of vascular endothelial cells in patients with CAV results in preferential upregulation of certain endothelial-derived mesenchymal growth factors capable of stimulating smooth muscle cell proliferation and migration.

Authors : Hosenpud J D , Morris T E , Shipley G D , Mauck K A , Wagner C R ,

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