[The relation between expression of PML-RAR alpha gene and effects of ATRA on proliferation and differentiation of NB4 cells].
OBJECTIVE
To study the relation between the PML-RAR alpha gene and the effects of ATRA on proliferation and differentiation in acute promyelocytic leukemia cell line NB4 cells.


METHODS
ASODN-mediated inactivation of the PML-RAR alpha mRNA was measured by RT-PCR. The proliferation and differentiation of NB4 cells were determined by proliferation curve, morphology, CD antigen of membrane and NBT test. NB4 Cell cycle was analyzed by FACS.


RESULTS
The inactivation of PML-RAR alpha mRNA by ASODN could egnhance the maturation effects and growth suppression of ATRA on NB4 cells. The percentage of S phase cell was decreased from 52% to 29%, and NBT rate increased. All suggest that the sensitivity of NB4 cell to ATRA was improved.


CONCLUSIONS
The PML-RAR alpha gene, as a molecular marker of APL, is responsible for pathogenesis of APL, and it also decreases the sensitivity of ATRA to APL cells.
Department of Hematology, Xijing Hospital, Fourth Military Medical University, Xi'an.
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W
Yu
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B
Sun
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Chen
D000970:Antineoplastic Agents / Q000494:pharmacology*; D002471:Cell Transformation, Neoplastic / Q000187:drug effects*; D015870:Gene Expression; D006801:Humans; D015473:Leukemia, Promyelocytic, Acute / Q000235:genetics* / Q000473:pathology; D009363:Neoplasm Proteins / Q000096:biosynthesis*; D015514:Oncogene Proteins, Fusion / Q000096:biosynthesis*; D014212:Tretinoin / Q000494:pharmacology*; D014407:Tumor Cells, Cultured
D000970:Antineoplastic Agents; D009363:Neoplasm Proteins; D015514:Oncogene Proteins, Fusion; C093476:promyelocytic leukemia-retinoic acid receptor alpha fusion oncoprotein; D014212:Tretinoin