Background:

Phosphatidylinositol 3-kinase (PI3K) was first identified over 20 years ago as a lipid kinase associated with viral oncoproteins. PI3K signaling pathway regulates various cellular processes such as growth, cell cycle progression, apoptosis, migration, metabolism, and cytoskeleton rearrangement. HS-173 is a novel PI3K inhibitor.

In vitro: HS-173 inhibited the PI3K signaling pathway, and showed anti-proliferative effects on cancer cells. Also, HS-173 induced cell cycle arrest at the G2/M phase and apoptosis. In addition, HS-173 decreased the expression HIF-1a and VEGF which play an important role in angiogenesis. This effect was confirmed by the suppression of tube formation and migration assay in vitro [1].

In vivo: HS-173 diminished blood vessel formation in the Matrigel plug assay in mice. These results suggest that HS-173 has potent anti-angiogenic activity in vivo [1].

Clinical trials: Currenlty no clinical data are available.

Reference:
[1] Lee H, Jung KH, Jeong Y, Hong S, Hong SS.   HS-173, a novel phosphatidylinositol 3-kinase (PI3K) inhibitor, has anti-tumor activity through promoting apoptosis and inhibiting angiogenesis. Cancer Lett. 2013 Jan 1;328(1):152-9.