RESUMO
<p><b>OBJECTIVE</b>To study the betulonic acid on the cell cycle and related protein expressions on mice of bearing H22 tumor cells.</p><p><b>METHOD</b>Flow cytometray was used to observe the changes of betulonic acid on the cell cycle and P53 of H22 tumor cells. Immunohistochemistry was determined the espressions of PI3K and AKT.</p><p><b>RESULT</b>Increasing the doses of betulonic acid, the number of H22 cells in S phase and G2 phase was increasing gradually, it can speculate that when the betulonic acid act on cells, the cells were blocked in S and G2 phase and inhibited the protein expressions of PI3K and AKT.</p><p><b>CONCLUSION</b>Betulonic acid may be up-regulate the activity of P53 and inhibite the expressions of PI3K and AKT, so that it inhibited the survival pathway of tumor cells.</p>