An RNA aptamer provides a novel approach for the induction of apoptosis by targeting the HPV16 E7 oncoprotein.
<h4>Background</h4>Human papillomavirus 16 (HPV16) is a high-risk DNA tumour virus, which is a major causative agent of cervical cancer. Cellular transformation is associated with deregulated expression of the E6 and E7 oncogenes. E7 has been shown to bind a number of cellular proteins,...
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2013
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oai:doaj.org-article:294d773af4774c22bff726cfb29127e12021-11-18T07:43:47ZAn RNA aptamer provides a novel approach for the induction of apoptosis by targeting the HPV16 E7 oncoprotein.1932-620310.1371/journal.pone.0064781https://doaj.org/article/294d773af4774c22bff726cfb29127e12013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23738000/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>Human papillomavirus 16 (HPV16) is a high-risk DNA tumour virus, which is a major causative agent of cervical cancer. Cellular transformation is associated with deregulated expression of the E6 and E7 oncogenes. E7 has been shown to bind a number of cellular proteins, including the cell cycle control protein pRb. In this study, RNA aptamers (small, single-stranded oligonucleotides selected for high-affinity binding) to HPV16 E7 were employed as molecular tools to further investigate these protein-protein interactions.<h4>Methodology/principal findings</h4>This study is focused on one aptamer (termed A2). Transfection of this molecule into HPV16-transformed cells resulted in inhibition of cell proliferation (shown using real-time cell electronic sensing and MTT assays) due to the induction of apoptosis (as demonstrated by Annexin V/propidium iodide staining). GST-pull down and bead binding assays were used to demonstrate that the binding of A2 required N-terminal residues of E7 known to be involved in interaction with the cell cycle control protein, pRb. Using a similar approach, A2 was shown to disrupt the interaction between E7 and pRb in vitro. Furthermore, transfection of HPV16-transformed cells with A2 appeared to result in the loss of E7 and rise in pRb levels, as observed by immunoblotting.<h4>Conclusions/significance</h4>This paper includes the first characterisation of the effects of an E7 RNA aptamer in a cell line derived from a cervical carcinoma. Transfection of cells with A2 was correlated with the loss of E7 and the induction of apoptosis. Aptamers specific for a number of cellular and viral proteins have been documented previously; one aptamer (Macugen) is approved for clinical use and several others are in clinical trials. In addition to its role as a molecular tool, A2 could have further applications in the future.Clare NicolÖzlem CesurSophie ForrestTamara A BelyaevaDavid H J BunkaG Eric BlairNicola J StonehousePublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 5, p e64781 (2013) |
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| topic |
Medicine R Science Q |
| spellingShingle |
Medicine R Science Q Clare Nicol Özlem Cesur Sophie Forrest Tamara A Belyaeva David H J Bunka G Eric Blair Nicola J Stonehouse An RNA aptamer provides a novel approach for the induction of apoptosis by targeting the HPV16 E7 oncoprotein. |
| description |
<h4>Background</h4>Human papillomavirus 16 (HPV16) is a high-risk DNA tumour virus, which is a major causative agent of cervical cancer. Cellular transformation is associated with deregulated expression of the E6 and E7 oncogenes. E7 has been shown to bind a number of cellular proteins, including the cell cycle control protein pRb. In this study, RNA aptamers (small, single-stranded oligonucleotides selected for high-affinity binding) to HPV16 E7 were employed as molecular tools to further investigate these protein-protein interactions.<h4>Methodology/principal findings</h4>This study is focused on one aptamer (termed A2). Transfection of this molecule into HPV16-transformed cells resulted in inhibition of cell proliferation (shown using real-time cell electronic sensing and MTT assays) due to the induction of apoptosis (as demonstrated by Annexin V/propidium iodide staining). GST-pull down and bead binding assays were used to demonstrate that the binding of A2 required N-terminal residues of E7 known to be involved in interaction with the cell cycle control protein, pRb. Using a similar approach, A2 was shown to disrupt the interaction between E7 and pRb in vitro. Furthermore, transfection of HPV16-transformed cells with A2 appeared to result in the loss of E7 and rise in pRb levels, as observed by immunoblotting.<h4>Conclusions/significance</h4>This paper includes the first characterisation of the effects of an E7 RNA aptamer in a cell line derived from a cervical carcinoma. Transfection of cells with A2 was correlated with the loss of E7 and the induction of apoptosis. Aptamers specific for a number of cellular and viral proteins have been documented previously; one aptamer (Macugen) is approved for clinical use and several others are in clinical trials. In addition to its role as a molecular tool, A2 could have further applications in the future. |
| format |
article |
| author |
Clare Nicol Özlem Cesur Sophie Forrest Tamara A Belyaeva David H J Bunka G Eric Blair Nicola J Stonehouse |
| author_facet |
Clare Nicol Özlem Cesur Sophie Forrest Tamara A Belyaeva David H J Bunka G Eric Blair Nicola J Stonehouse |
| author_sort |
Clare Nicol |
| title |
An RNA aptamer provides a novel approach for the induction of apoptosis by targeting the HPV16 E7 oncoprotein. |
| title_short |
An RNA aptamer provides a novel approach for the induction of apoptosis by targeting the HPV16 E7 oncoprotein. |
| title_full |
An RNA aptamer provides a novel approach for the induction of apoptosis by targeting the HPV16 E7 oncoprotein. |
| title_fullStr |
An RNA aptamer provides a novel approach for the induction of apoptosis by targeting the HPV16 E7 oncoprotein. |
| title_full_unstemmed |
An RNA aptamer provides a novel approach for the induction of apoptosis by targeting the HPV16 E7 oncoprotein. |
| title_sort |
rna aptamer provides a novel approach for the induction of apoptosis by targeting the hpv16 e7 oncoprotein. |
| publisher |
Public Library of Science (PLoS) |
| publishDate |
2013 |
| url |
https://doaj.org/article/294d773af4774c22bff726cfb29127e1 |
| work_keys_str_mv |
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