E7HPV16 Oncogene and 17beta-Estradiol Stress, Promotes Oncogenic microRNA Expression Patterns, Cell Proliferation and...

Area of Science:

• Oncology
• Molecular Biology
• Biochemistry

Background:

• Cervical cancer (CC) is a significant cause of death in women, linked to HPV infection and estrogen use.
• Early diagnosis is crucial for preventing CC progression, necessitating the identification of early biomarkers.
• Tumor suppressor miR-218 is downregulated, while oncomiR miR-21 and oncogene Kcnma1 are upregulated in CC.

Purpose of the Study:

• To investigate the role of 17β-estradiol (E2) and HPV16 E7 oncoprotein in early cervical carcinogenesis.
• To analyze the expression of Kcnma1 oncogene in Cervical Intraepithelial Neoplasia 1 (CIN 1).
• To evaluate miR-218, Kcnma1, and Bcl-2 as potential early circulating biomarkers for CC.

Main Methods:

• Utilized a K14E7HPV16 transgenic mouse model for cervical carcinogenesis.
• Administered a single dose of 17β-estradiol (E2) to young mice.
• Analyzed cell proliferation, oncogene expression (Bcl-2, Kcnma1), and microRNA levels (miR-218) in cervical tissue and serum.

Main Results:

• A single E2 dose promoted CIN 1 development, increased cell proliferation, and upregulated Bcl-2 expression.
• Hormonal stress and E7 expression led to decreased miR-218 and increased Kcnma1 and Bcl-2 mRNA in cervical tissue and serum.
• Demonstrated Kcnma1 as a target gene of miR-218.

Conclusions:

• Estrogen stimulation and HPV E7 expression are significant factors in early cervical carcinogenesis.
• miR-218 and Kcnma1 show promise as early circulating biomarkers for cervical cancer.
• This study highlights the interplay between hormonal factors, viral oncoproteins, and molecular changes in CC development.