Related Experiment Videos
Up-regulation of telomerase activity in human lymphocytes
O Yamada1, T Motoji, H Mizoguchi
1Department of Hematology, Tokyo Women's Medical College, Japan.
Insights
Telomerase activity was detected and regulated in human lymphocytes upon activation. This finding is useful for studying cancer and developing telomerase-inhibitory drugs.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- Telomerase is a key enzyme involved in maintaining telomere length.
- Understanding telomerase regulation is crucial for cancer research and drug development.
Purpose of the Study:
- To investigate the regulation of telomerase activity in human lymphocytes during activation.
- To establish a model system for studying telomerase in carcinogenesis and drug testing.
Main Methods:
- Human lymphocytes were isolated from normal donors.
- Peripheral blood mononuclear cells were cultured with phytohemagglutinin, anti-CD3 monoclonal antibody, or Pansolbin.
- Telomerase activity was measured over a 96-hour period.
Main Results:
- Telomerase activity was detected in normal human lymphocytes.
- Activation of lymphocytes led to up-regulation of telomerase within 24 hours, peaking at 72-96 hours.
- Cell number and telomeric DNA length remained constant during telomerase up-regulation.
- Phytohemagglutinin, anti-CD3 monoclonal antibody, and Pansolbin all induced telomerase activity.
Conclusions:
- Telomerase activity is regulated during lymphocyte activation, correlating with cell cycle progression from G0 to S phase.
- The described system provides a valuable tool for investigating telomerase's role in carcinogenesis.
- This model is suitable for screening and testing potential telomerase-inhibitory drugs.
Abstract:
We detected telomerase activity in human lymphocytes obtained from normal donors. Telomerase was up-regulated within 24 h when peripheral blood mononuclear cells were cultured in the presence of phytohemagglutinin. The activity increased gradually over 72 h, then remained stable for 96 h. During this period, cell number and the length of telomeric DNA remained constant. Anti-CD3 monoclonal antibody and Pansolbin also induced telomerase activity. These results demonstrate that telomerase is regulated during lymphocyte activation as cells progress from G0 to S phase. This system is useful for the study of telomerase during carcinogenesis, and in the testing of telomerase-inhibitory drugs.