Epitalon increases telomere length in human cell lines through telomerase upregulation or ALT activity.

In vitro study using human cell lines

“There were several limitations of our work, the main one being that this was an in vitro study using human cell lines in 2D cell cultures.”

Human breast cancer cell lines (21NT, BT474) and normal epithelial and fibroblast cells (HMEC, IBR.3)

“In this article, the breast cancer cell lines 21NT, BT474, and normal epithelial and fibroblast cells were treated with epitalon then DNA, RNA, and proteins were extracted.”

4 days for cancer cells and 3 weeks for normal cells

“Breast cancer cells (21NT and BT474) were treated daily with (0.1, 0.2, 0.5, and 1.0 μg/mL) of epitalon for 4 days. Normal fibroblast cells (IBR.3) and epithelial cells (HMEC) were treated daily with 1.0 μg/mL of epitalon for 3 weeks.”

In cancer cells, telomere length extension occurred through ALT activation rather than telomerase activity.

“In cancer cells, significant telomere length extension also occurred through ALT (Alternative Lengthening of Telomeres) activation.”

ALT activity was significantly increased in cancer cells but not in normal cells.

“Only a minor increase in ALT activity was observed in Normal cells, thereby showing that it was specific to cancer cells.”

The study was conducted in vitro using 2D cell cultures, which may not accurately mimic a natural cellular environment.

“There were several limitations of our work, the main one being that this was an in vitro study using human cell lines in 2D cell cultures.”