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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Cancer
2016 ; 7
(14
): 1926-1938
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Selection, Analysis and Improvement of Anti-Angiogenesis Compounds Identified by
an Anti-HIF-1? Screening and Validation System
#MMPMID27877208
Madu C
; Li L
; Lu Y
J Cancer
2016[]; 7
(14
): 1926-1938
PMID27877208
show ga
Cancer cells resort to activating hypoxia-inducible factor-1 (HIF-1) as one of
several responses to hypoxic conditions. Overexpression of HIF-1, the
transcriptional regulator for a group of malignant-pathway related genes
including vascular endothelial growth factor (VEGF), is associated with increased
tumor growth, vascularization, and metastasis. HIF-1 is composed of an inducible
subunit, HIF-1? and a constitutively expressed subunit, HIF-1ß. HIF-1 activity is
mainly dependent on the level of HIF-1? protein, the inducible and regulatory
subunit of the HIF-1 heterodimer complex; thus, identification of novel
anti-HIF-1? agents will lead to effective blockage of the HIF-1 (HIF-1?)-mediated
"switch-on" function for those malignant-pathway related genes and suppression of
the HIF-1?/VEGF-mediated signaling pathway that promotes cancer progression and
metastasis. While there is an extremely large number of small molecule compounds
in the database (compound libraries), the currently existing screening system is
inefficient and time-consuming; or, at best, the application of the existing
screening system is very limited as it is usually not coupled with biological
validation processes. The further development of potential drugs is partly
hindered due to the cumbersome steps in between the primary screen and consequent
validation: the slow, exhausted and sometimes lack of a linked biological
validation process contributes to the dismal fate of scant compounds uncovered in
the primary screen. To improve upon the status quo, we developed a prototype
screening system that is coupled anti-HIF-1? primary screen with secondary
anti-VEGF/anti-angiogenesis validation screens. We used breast cancer cells as
the model to select potent anti-HIF-1? small-molecule compounds by their
abilities to inhibit transactivation of a VEGF promoter fused to a luciferase
reporter gene under hypoxia. Positive compounds were then validated by a series
of assays that confirm compounds' anti-HIF-1? activities including measurement of
their effects on HIF-1? downstream VEGF gene expression and angiogenic ability of
breast cancer cells. Moreover, we demonstrated that we could further improve the
compound's potency of anti-HIF-1? and anti-angiogenesis by modifying the
identified lead to synthesize a superior (novel) drug.