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- W4285392913 abstract "Introduction. High carcinogenic-risk human papillomaviruses (hrHPVs) are recognized as etiological agents of cervical cancer. Constant expression of the viral oncoproteins, E6 and E7, is required for maintenance of the malignant phenotype of tumor cells. The exact mechanism of regulation of viral oncogenes expression in tumor cells is not fully elucidated.
 The purpose: identification of viral noncoding RNAs (ncRNAs) in HPV16-positve cervical cancer.
 Materials and methods. The reverse transcription polymerase chain reactions were used to detect viral ncRNAs in HPV16-positve primary cervical squamous cell carcinomas and SiHa and CasKi cell lines. The knockdown technique with oligonucleotides complementary to ncRNAs was used to elucidate their functions.
 Results. We have identified ncRNAs transcribed in the upstream regulatory region of HPV16 in the cervical carcinoma cell lines and in 32 out 32 cervical squamous cell carcinomas with episomal or integrated forms of HPV16 DNA. Knockdown of sense or antisense strains of ncRNAs by oligonucleotides results in a decrease or increase of the E6 and E7 oncogenes mRNA levels in cells, respectively. These changes of oncogenes mRNA levels are accompanied by the modulation of the levels of the p53 protein, the main target of the E6 oncoprotein.
 Conclusion. The presence of regulatory ncRNAs in all examined tumors and cell lines revealed for the first time indicates their necessity for maintenance of constant expression of E6 and E7 oncogenes in them. The findings can be useful for understanding of the fundamental aspects of the viral expression regulation in HPV16-positive tumors." @default.
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- W4285392913 date "2022-09-05" @default.
- W4285392913 modified "2023-10-01" @default.
- W4285392913 title "Identification regulatory noncoding RNAs of human papilloma virus type 16 <i>(Papillomaviridae: Alphapapillomavirus: Human papillomavirus)</i> in cervical tumors" @default.
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- W4285392913 doi "https://doi.org/10.36233/0507-4088-108" @default.
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