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[The research on the expression and localization of multiple myeloma associated antigen MMSA-1].

AIM
To study the expression profile of multiple myeloma associated gene (MMSA-1), explore the relationship between its expression level and MM cells' proliferation as well as its celluler localization.


METHODS
The mRNA levels of MMSA-1 and DKK1 genes were detected by RT-PCR in patients with MM, leukemia, non-tumor diseases and in the healthy donors, respectively. Then, their correlation was analyzed. The effects of Ibandronate Sodium on the cell cycle and early apoptosis of 8226 cells were analyzed by flow cytometry, and the effect on its protein expression was analyzed by immunohistochemistry. Construct MMSA-1 eukaryotic expression vector pCMV-Myc-MMSA-1, and antibody immunohistochemistry was applied to study the cellular localization of the protein.


RESULTS
MMSA-1 gene was expressed in all of the specimens described above, and the mRNA level in MM was much higher than that in the others, just like DKK1 gene. More than that, their expression exhibited a significant positive correlation. Ibandronate Sodium could inhibit cell proliferation by a cell-cycle arrest in S-phase. By reducing cell maturation promoting factor release, it stopped the cell cycle, promoted their early apoptosis and decreased the protein expression of MMSA-1. MMSA-1 protein principally distributed on cell membranes, however, there are a small quantity in cytalplasm.


CONCLUSION
These results revealed that MMSA-1 may play a pivotal role in MM proliferation and osteolysis destruction, which lay the foundation for the further study of biological function and immunotherapy based on MMSA-1.