Enhanced expression of halp gene confers cellular resistance to H2O2 induced senescence / 中国医学科学杂志(英文版)
Chinese Medical Sciences Journal
; (4): 1-5, 2006.
Article
in English
| WPRIM (Western Pacific)
| ID: wpr-305398
Responsible library:
WPRO
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the H2O2-induced expression of human histone acetyltransferase-like protein (hALP), a telomerase regulation-associated gene, and its effects on the stress-triggered cellular senescence.</p><p><b>METHODS</b>The induced expression of hALP was measured by semi-quantitative RT-PCR and immunofluorescent histochemistry after treatment of HeLa cells by H2O2. The effects of hALP expression on cellular responses to H2O2 were analyzed by MTT, flowcytometry, and SA-beta-gal staining, respectively.</p><p><b>RESULTS</b>hALP mRNA could be dose-dependently induced by treatments of 0.2-1.6 mmol/L H2O2, and the induction could be observed after 6 hours and kept for 36 hours in the presence of 0.4 mmol/L H2O2. Meanwhile, the immunofluorescent staining showed marked stronger nuclear intensity of hALP protein in H2O2-treated HeLa cells. In the treatment of H2O2, the ectopic expression of hALP enhanced continuous growth and overcame G2/M arrest as well as decreased senescence-associated beta-gal staining. On the contrary, the transfected clones with antisense or blank vector and original He-La cells presented growth suppression, G2/M delay and higher percentage of SA-beta-gal activities in the presence of H2O2.</p><p><b>CONCLUSIONS</b>The expression of hALP could be up-regulated by treatment of H2O2, and elevated expression could enhance cellular resistance to H2O2-induced cellular senescence. The data might be of references to elucidation of basic biological function of hALP gene and its associated telomerase activity.</p>
Full text:
Available
Database:
WPRIM (Western Pacific)
Main subject:
Pharmacology
/
Asparaginase
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Autoantigens
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RNA, Messenger
/
HeLa Cells
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Transfection
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Cell Cycle
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Up-Regulation
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Oxidants
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Cellular Senescence
Limits:
Humans
Language:
English
Journal:
Chinese Medical Sciences Journal
Year:
2006
Document type:
Article