Human Endometrial Carcinogenesis Is Associated with Significant Reduction in Long Non-Coding RNA, TERRA

Area of Science:

• Molecular Biology
• Oncology
• Genetics

Background:

• Telomeres are crucial for chromosomal stability and are regulated by telomerase activity (TA).
• Telomeric repeat containing RNAs (TERRAs) are long non-coding RNAs transcribed from telomeres, involved in cellular regulation.
• High telomerase activity is linked to endometrial cancer (EC) development.

Purpose of the Study:

• To investigate the levels of three specific TERRAs in healthy and EC human endometrium.
• To explore the association between TERRA levels, cellular proliferation, telomerase activity, and telomere length in EC.
• To evaluate the potential role of TERRAs in endometrial carcinogenesis.

Main Methods:

• Quantification of TERRAs transcribed from chromosomes 16p and 20q in healthy (n=23) and EC (n=24) endometrial tissues.
• Analysis of the correlation between TERRA levels, telomerase activity, and the proliferation marker Ki67.
• Single telomere length analysis (STELA) to assess telomere shortening in EC samples.

Main Results:

• Significantly reduced levels of Ch-16p and Ch-20q TERRAs were observed in EC compared to healthy postmenopausal endometrium.
• TERRA levels did not correlate with telomerase activity but showed a negative correlation with Ki67, indicating reduced proliferation.
• EC samples exhibited significant telomere shortening at XpYp telomeres compared to healthy tissues.

Conclusions:

• TERRA levels are altered in malignant endometrium, with specific TERRAs significantly reduced in EC.
• The negative correlation of TERRAs with proliferation suggests a potential tumor-suppressive role.
• TERRAs warrant further investigation as potential therapeutic targets for endometrial cancer.