Abstract:
:Vascular endothelial growth factor D has recently been linked to the control of lymphangiogenesis and lymphatic metastasis. The molecular determinants regulating vegf-D gene transcription, however, have not yet been identified. After isolation of 2 kb of 5'-flanking DNA of the human vegf-D gene, we identified a novel, atypical direct repeat (DR) element consisting of a consensus half-site (AGGTCA) at -125/-119 and a degenerated DR half-site (ATGTTA) at -99/-94 as sufficient and necessary for vegf-D transcription. The vegf-D DR element is bound and activated by the orphan receptors hepatocyte nuclear factor 4 alpha (HNF-4 alpha) and chicken ovalbumin upstream promoter transcription factor (COUP-TF)-1/COUP-TF2. Additionally, chromatin immunoprecipitation assays identified transcriptional coactivators cyclic AMP-responsive element binding protein-binding protein and glucocorticoid receptor interacting protein 1 at the vegf-D DR element and functional assays confirmed their stimulatory effect on the vegf-D promoter. Histone deacetylase inhibition by trichostatin A led to accumulation of acetylated histones H3/H4 at the vegf-D promoter, up-regulation of vegf-D mRNA levels, and transactivation of vegf-D promoter reporter gene constructs in cancer cell lines. This study for the first time describes the molecular determinants in cis and trans controlling vegf-D gene transcription and identifies interaction of HNF-4 alpha and COUP-TF1/COUP-TF2 with a proximal, atypical DR element as indispensable for vegf-D transcription. Moreover, our findings suggest that epigenetic control of histone acetylation represents an important determinant of vegf-D gene expression in cancer cells. These results provide novel insights into the molecular machinery controlling vegf-D gene expression and may add to a better understanding of the regulation of lymphangiogenesis in vascular development and cancer.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Schäfer G,Wissmann C,Hertel J,Lunyak V,Höcker Mdoi
10.1158/0008-5472.CAN-07-5136subject
Has Abstractpub_date
2008-01-15 00:00:00pages
457-66issue
2eissn
0008-5472issn
1538-7445pii
68/2/457journal_volume
68pub_type
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