Extension of cell life span using exogenous telomerase

Area of Science:

• Cell Biology
• Molecular Biology
• Genetics

Background:

• Normal human somatic cells have a limited number of cell divisions, a process linked to telomere shortening.
• Telomeres, protective caps on chromosomes, shorten with each replication cycle, triggering cellular senescence.
• Telomerase, an enzyme, can synthesize telomeric DNA, potentially counteracting senescence.

Purpose of the Study:

• To discuss methods for extending the in vitro replicative lifespan of primary human cells.
• To explore the role of telomere reverse transcriptase (hTERT) in cellular immortalization.
• To provide detailed protocols for ectopic hTERT expression in human cells.

Main Methods:

• Overexpression of the telomere reverse transcriptase gene (hTERT) in primary human cells.
• Analysis of cellular life span extension and potential immortalization.
• Investigating cell type-specific responses to telomerase reconstitution.

Main Results:

• Ectopic hTERT expression can lead to the extension of replicative lifespan in primary human cells.
• While telomere shortening is a key factor, other mechanisms also limit cellular lifespan.
• Telomerase activity is crucial for cellular immortalization across different cell types.

Conclusions:

• Ectopic expression of hTERT is a viable strategy to extend the in vitro replicative lifespan of human cells.
• Understanding cell type-specific responses is important when considering telomerase-based interventions.
• Telomerase activity is a fundamental requirement for achieving cellular immortalization.