Which human cell types possess telomerase activity? What...

Name: Problem 22, Chapter 24: Molecular Cell Biology
Uploaded: 2021-09-18T16:26:02-08:00
Duration: 4 min 22 s
Channel: Sana Riaz
Description: Which human cell types possess telomerase activity? What characteristic of cancer is promoted by expression of telomerase? What concerns does this pose for medical therapies involving stem cells?

Which human cell types possess telomerase activity? What characteristic of cancer is promoted by expression of telomerase? What concerns does this pose for medical therapies involving stem cells?

Key Concepts

Stem Cells

Stem cells are undifferentiated cells capable of self-renewal and differentiation into various specialized cell types. They naturally maintain a certain level of telomerase activity to support their long-term proliferative potential, which is crucial for tissue regeneration and repair.

Telomerase

Telomerase is an enzyme that adds specific DNA sequence repeats to the ends of chromosomes, known as telomeres. This process protects the chromosome from deterioration or fusion with neighboring chromosomes, which is essential in cells that require long-term proliferative capacity such as germ cells, stem cells, and cancer cells.

Telomeres

Telomeres are repetitive nucleotide sequences located at the ends of chromosomes. They protect the genetic data during cell division by preventing the loss of important DNA segments. Their progressive shortening in the absence of sufficient telomerase activity is associated with cellular aging and eventual senescence.

Cellular Immortalization

The feature of cellular immortalization refers to the ability of cells to divide indefinitely, overcoming the normal limits of replication. In many cancers, the reactivation of telomerase allows for the maintenance of telomere length, thereby promoting unchecked cell division and tumor growth.

Therapeutic Risks in Stem Cell Therapies

The presence and regulation of telomerase in stem cells pose significant concerns for medical therapies. While telomerase is essential for maintaining the replicative capacity of these cells, its overactivation could lead to uncontrolled cell proliferation and a higher risk of malignant transformation, thereby complicating regenerative medicine and stem cell-based treatment strategies.

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