Open AccessPromotion of cell proliferation by HBXIP via upregulation of human telomerase reverse transcriptase in human mesenchymal stem cells 1
Author(s) -
WANG Fengze,
SHA Li,
YE Lihong,
ZHANG Xiaodong
Publication year - 2008
Publication title -
acta pharmacologica sinica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.514
H-Index - 90
eISSN - 1745-7254
pISSN - 1671-4083
DOI - 10.1111/j.1745-7254.2008.00729.x
Subject(s) - telomerase reverse transcriptase , telomerase , rna interference , biology , microbiology and biotechnology , cell growth , downregulation and upregulation , transfection , cancer research , cell culture , rna , gene , genetics
Aim : We previously found that the hepatitis B X‐interacting protein (HBXIP) was able to promote the proliferation of cells. Telomerase activity is known to be critical in cellular senescence and its level is modulated by the regulation of the telomerase catalytic subunit, telomerase reverse transcriptase (TERT), at both the transcriptional and post‐transcriptional levels. To investigate the mechanism of promoting proliferation by HBXIP, the effect of HBXIP on human TERT (hTERT) was investigated in human mesenchymal stem cells (hMSC). Methods : BMMS‐03 cells and hMSC from the bone marrow of a 4‐month‐old elicited fetus, were transiently transfected with the pcDNA3‐hbxip plasmid encoding the HBXIP gene and pSilencer‐hbxip plasmid encoding RNA interference (RNAi) targeting HBXIP mRNA, followed by the examination of the hTERT promoter reporter gene by luciferase assay, and the detection of telomerase activity by telomeric repeat amplication protocol, respectively, as well as the expression levels of hTERT, c‐Myc, and Bcl‐2 by Western blot analysis. Results : The overexpression of HBXIP led to a significant upregulation of hTERT promoter activity, telomerase activity, and the expression levels of hTERT, c‐Myc, and Bcl‐2 in BMMS‐03 cells. RNAi targeting HBXIP mRNA produced the opposite results completely. Conclusion : Our data demonstrated that HBXIP significantly stimulated the transcription and expression of hTERT and increased the activity of telomerase in BMMS‐03 cells, which provides a new insight into the mechanism of promoting cell proliferation by HBXIP.