Tumor Cells Fail to Induce Telomerase in Co-Cultivated Endothelial Cells

Normal human endothelial cells are known to exhibit accelerated telomere shortening, leading to replicative senescence after a limited number of cell divisions. Recent research has suggested that human tumor cells may up-regulate telomerase expression in co-cultivated endothelial cells, potentially impacting tumor progression. However, a study conducted by E. Pascale and colleagues at the University of Rome found that tumor cells do not induce telomerase activity in human umbilical vein endothelial cell cultures.

Key Takeaways:

• The study, published in Cancer Research, investigated the presence of telomerase in human endothelial cells co-cultivated with tumor cells or grown with tumor-conditioned medium.
• The researchers found modest but detectable amounts of telomerase in human endothelial cell cultures that disappeared as the cultures approached senescence.
• Quantitative reverse transcription-polymerase chain reaction showed a direct correlation between human telomerase reverse transcriptase expression and the proliferative index of the cultures.
• Despite the initial findings suggesting a possible link between tumor cells and telomerase up-regulation, the study found no evidence of telomerase induction by tumor cells under any of the tested conditions.
• The study's results indicate that telomerase in human endothelial cells follows an activation program strictly associated with culture growth rate.

Statistics:

• The study analyzed primary human endothelial cells co-cultivated with tumor cells or grown with tumor-conditioned medium.
• The researchers found modest but detectable amounts of telomerase in all human endothelial cell cultures analyzed.
• Quantitative reverse transcription-polymerase chain reaction showed a direct correlation between human telomerase reverse transcriptase expression and the proliferative index of the cultures.
• The study demonstrated that telomerase in human endothelial cells is strictly associated with culture growth rate.

Sources:

• Cancer Research, 64(21), 7702-7705 (2004)
• Health & Medicine Week via NewsRx.com & NewsRx.net (Copyright 2005)