L. extract Attenuates Angiogenesis Through HIF-1α and WNT Mediated Blockage of VEGF/Angiopoietin Axis.

OBJECTIVES

The current study investigated angiogenesis-arresting attributes of oleo-gum resin extract and its underlying molecular mechanisms.

METHODS

Series of , and models were used to assess anti-angiogenic properties.

RESULTS

MTT cell viability experiments showed that oleo-gum resin extract induced moderate cytotoxicity towards EA.hy926 cells (IC = 42 µg/mL). Extract-treated cells showed significant reduction in invasion, migration, and tube formation potential. At the protein level, down-regulation in expression of angiopoietin-1 and -2, Tie-2, MMP-1 and -9, VEGF-A, and VEGFR2 pro-angiogenic proteins was observed in extract-treated EA.hy926 cells. Signalling array data indicated a marked down-regulation of transcription factors, i.e., HIF-1α and WNT (-3.68 ± 5.74 and -6.24 ± 6.50 fold-change). Furthermore, extract treatment diminished vessel-sprouting in 3D spheroids, rat aorta ring, and chick embryo chorioallantoic membrane models. Treatment with extract significantly reduced intracellular ROS and caspases-8 and -9 levels. GC-MS and HPLC analyses of extract indicated the presence of (+)-α-longipinene, isoledene, cedrene and α-elemene. ADMET prediction of detected compounds revealed good intestinal absorption (> 90%) and skin permeability (log Kp < -2.5), making the extract a suitable candidate for the treatment of angiogenesis-associated intestinal and skin disorders.

CONCLUSION

Overall, these findings suggest that extract exhibits anti-angiogenic properties by down-regulating the VEGF/angiopoietin axis, warranting further investigations in treating angiogenesis-associated diseases.