[Effects of Tripterine on Adhesion Molecules and Cell Cycle in Human Acute Promyelocytic Leukemia Model Mice]

To observe the effects of tripterine on adhesion molecules and cell biological characteristics in mice with acute promyelocytic leukemia (APL) tumor.

Eighteen SCID beige mice were caudal vein injected with NB4 cell lines (5×10⁶/only) to construct a human APL tumor-bearing model, then the mice were divided into tumor-bearing model group, arsenic trioxide group and tripterine group randomly, and another 6 mice which didn't construct model were set up as control group; after 3 weeks, the control group and the tumor-bearing model were intraperitoneally injected with normal saline as compared, arsenic trioxide was intraperitoneally injected according to 100 μg/kg, and tripterine was intraperitoneally injected according to 3 mg/kg. Four groups were all injected for 3 weeks. The biological characteristics of NB4 cells and the expression of adhesion molecules in venous blood of mice after treatment were observed.

The neutrophil decrased and promyelocytes, NB4 cells, B lymphocytes and white blood cells increased in tumor-bearing group as compared with control group (P<0.05), and the expressions of serum P-selectin (P-selectin), soluble vascular adhesion molecule-1 (soluble vascular adhesion molecule-1, sVCAM-1) and soluble intercellular adhesion molecule-1 (soluble intercellular adhesion molecule-1, sICAM-1) all increased (P<0.05). The cell cycle showed that the proportion of G₀ and G₁ increased, but S, G₂-M phases obviously decreased (P<0.05). Compared with the tumor-bearing group, the neutrophils increased in the tripterine group, and the expression of early promyelocyte, NB4 cell, B lymphocyte, leukocyte, P-selectin, sVCAM-1 and sICAM-1 protein decreased (P<0.05), moreover, the ratio of G₀ and G₁ decreased, the G₂-M and S phases increased (P<0.05). Among which sVCAM-1 and sICAM-1 of leucocyte, NB4 cell, P-selectin and adhesion molecules in tripterine group showed significant difference as compared with arsenic trioxide group (P<0.05).

Tripterine may not only inhibit the expression of sVCAM-1 and sICAM-1 proteins in APL tumor-bearing mice and reduce the adhesion of tumor cells, but also block tumor cells at G₂-M and S phases, thereby exerting therapeutic effect on APL.