OBJECTIVETo explore the inhibitory effect of 2- (4-morpholine) -8- phenyl -4 hydrogen -1- benzo -4 ketone (LY294002) on proliferation of multiple myeloma cell U266 and its mechanism.

METHODSU266 cells were cultured with 0, 5, 10, 20 µmol/L LY294002 for 24, 48 and 72 h, the cell viability was measured by MTT method, cell morphology was observed by acridine orange staining, cell cycle was measured by flow cytometry. The expressions of B-cell lymphoma-2 (BCL-2), BCL-2-associated X protein (BAX), Cyclin D1, Cyclin E and activation of phosphatidyl inositol 3 kinase (PI3K)/protein kinase B (AKT) signal pathway were measured by Western blot.

RESULTSU266 cell viability was reduced in time- and dose-dependent manner after treatment with 5, 10, 20 µmol/L of LY294002 for 24, 48, 72 h. The 5, 10, 20 µmol/L LY294002 leaded to cell nucleus dense and thick, and the cell cycle arrested in the Gphase (P<0.01). The expressions of BCL-2, Cyclin D1, Cyclin E, PI3K and p-AKT were down-regulated (P<0.01), and the expression of BAX up-regulated (P<0.01).

CONCLUSIONLY294002 can inhibit U266 cell proliferation via suppresion of activation of PI3K/AKT signal pathway.