In:
Circulation, Ovid Technologies (Wolters Kluwer Health), Vol. 132, No. suppl_3 ( 2015-11-10)
Abstract:
COA-Cl is a recently developed pro-angiogenic agent (Figure) that promotes tube forming activity of human umbilical vein endothelial cells that are co-cultured with fibroblasts. Recently, a metabolic stress-related co-transcription factor termed PGC-1α was identified as a novel activator of VEGF gene, a key regulator of angiogenesis. In skeletal muscle, the cAMP/CREB signaling pathway plays a central role in inducing PGC-1α expression. We therefore hypothesized that COA-Cl induces PGC-1α to promote VEGF production by elevating cAMP and activating CREB in fibroblasts. COA-Cl (100 μM for 48 h) augmented VEGF secretion into culture medium of normal human dermal fibroblasts from below the level of detection to 54±4 pg/mL (ELISA, p 〈 0.01 vs. basal). This enhancement of VEGF secretion was associated with up-regulation of mRNA encoding VEGF and PGC-1α (RT-PCR, 2.1±0.3 and 9.9±0.8 fold, p 〈 0.05, respectively). Induction of PGC-1α expression by COA-Cl was attenuated by 49±4% (p 〈 0.01 vs. COA-Cl alone) by H-89 (100 μM), an inhibitor of PKA. Conversely, forskolin (25 μM), a direct stimulator of adenylyl cyclase that increases cAMP, increased VEGF production (423±20 pg/mL, p 〈 0.01 vs. basal) and expression of mRNA encoding both VEGF and PGC-1α. COA-Cl induced an increase in cAMP content (ELISA) and phosphorylation of CREB at Ser133 (immunoblot), a PKA site associated with an increased transcriptional activity of CREB, in a time- and dose-dependent manner (4.4±0.3 and 2.3±0.2 fold at 100 μM COA-Cl for 20 min, p 〈 0.05, respectively). In COS-7 fibroblast-like cells, COA-Cl elevated luciferase activity of transfected reporter construct driven by CRE, which is regulated by cAMP/CREB (2.4±0.1 fold at 200 μM COA-Cl for 24 h). Collectively, our results demonstrate that COA-Cl elevates cAMP and activates CREB in human fibroblasts to induce PGC-1α expression, thereby promoting VEGF transcription and secretion, potentially identifying a novel way to induce therapeutic angiogenesis.
Type of Medium:
Online Resource
ISSN:
0009-7322
,
1524-4539
DOI:
10.1161/circ.132.suppl_3.11569
Language:
English
Publisher:
Ovid Technologies (Wolters Kluwer Health)
Publication Date:
2015
detail.hit.zdb_id:
1466401-X
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