Proteasomal degradation of p130 facilitate cell cycle deregulation and impairment of cellular differentiation in high-risk Human Papillomavirus 16 and 18 E7 transfected cells

The High-Risk Human Papillomaviruses (HR-HPVs) 16 and 18 are known to cause cervical cancer, which is primarily attributed to E6 and E7 oncoproteins. In addition, recent studies have focused on the vital role of the p130 pocket protein as an oncosuppressor to limit the expression of E2F transcriptio...

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Veröffentlicht in:Molecular biology reports 2021-06, Vol.48 (6), p.5121-5133
Hauptverfasser: Gandhi, Sivasangkary, Nor Rashid, Nurshamimi, Mohamad Razif, Muhammad Fazril, Othman, Shatrah
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creator Gandhi, Sivasangkary
Nor Rashid, Nurshamimi
Mohamad Razif, Muhammad Fazril
Othman, Shatrah
description The High-Risk Human Papillomaviruses (HR-HPVs) 16 and 18 are known to cause cervical cancer, which is primarily attributed to E6 and E7 oncoproteins. In addition, recent studies have focused on the vital role of the p130 pocket protein as an oncosuppressor to limit the expression of E2F transcription factors required for cell cycle progression. In view of this, the current study was conducted to investigate the mechanism by which transfection with HPV16/18 E7 leads to the deregulation of the host cell cycle, altering the localisation of p130, and expression of differentiation genes in Human Keratinocytes (HaCaT) cells. Co-immunoprecipitation, Western blot analysis, immunofluorescence microscopy, flow cytometry, quantitative-Polymerase Chain Reaction (qPCR), and the inhibition of p130 by MG132 inhibitor were employed to investigate the loss of p130 and its disruption in HPV 16/18 E7-transfected HaCaT cells. The HPV16- and HPV18-transformed cells, known as CaSki and HeLa, respectively, were also used to complement the ectopic expressions of E7 in HaCaT cells. Normal keratinocytes displayed higher level of p130 expression than HPV-transformed cells. In addition, the immunofluorescence analysis revealed that both HPV 16/18 E7-transfected HaCaT and HPV-transformed cells exhibited higher level of cytoplasmic p130 compared to nuclear p130. A significant increase in the number of S/G2 phase cells in HPV-transformed cells was also recorded since E7 has been shown to stimulate proliferation through the deactivation of Retinoblastoma Protein (pRB)-dependent G1/S checkpoint. Furthermore, the findings recorded the down-regulation of keratinocyte differentiation markers, namely p130, keratin10, and involucrin. The proteasomal degradation of the exported p130 confirmed the cellular localisation pattern of p130, which was commonly observed in cancerous cells. The findings provide strong evidence that the localisation of nuclear p130 nuclear was disrupted by HPV16/18 E7 led to the deregulation of the cell cycle and the impairment of cellular differentiation ultimately lead to cellular transformation.
doi_str_mv 10.1007/s11033-021-06509-4
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In addition, recent studies have focused on the vital role of the p130 pocket protein as an oncosuppressor to limit the expression of E2F transcription factors required for cell cycle progression. In view of this, the current study was conducted to investigate the mechanism by which transfection with HPV16/18 E7 leads to the deregulation of the host cell cycle, altering the localisation of p130, and expression of differentiation genes in Human Keratinocytes (HaCaT) cells. Co-immunoprecipitation, Western blot analysis, immunofluorescence microscopy, flow cytometry, quantitative-Polymerase Chain Reaction (qPCR), and the inhibition of p130 by MG132 inhibitor were employed to investigate the loss of p130 and its disruption in HPV 16/18 E7-transfected HaCaT cells. The HPV16- and HPV18-transformed cells, known as CaSki and HeLa, respectively, were also used to complement the ectopic expressions of E7 in HaCaT cells. Normal keratinocytes displayed higher level of p130 expression than HPV-transformed cells. In addition, the immunofluorescence analysis revealed that both HPV 16/18 E7-transfected HaCaT and HPV-transformed cells exhibited higher level of cytoplasmic p130 compared to nuclear p130. A significant increase in the number of S/G2 phase cells in HPV-transformed cells was also recorded since E7 has been shown to stimulate proliferation through the deactivation of Retinoblastoma Protein (pRB)-dependent G1/S checkpoint. Furthermore, the findings recorded the down-regulation of keratinocyte differentiation markers, namely p130, keratin10, and involucrin. The proteasomal degradation of the exported p130 confirmed the cellular localisation pattern of p130, which was commonly observed in cancerous cells. 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genetics</topic><topic>Alphapapillomavirus - pathogenicity</topic><topic>Animal Anatomy</topic><topic>Animal Biochemistry</topic><topic>Biomedical and Life Sciences</topic><topic>Cancer</topic><topic>Cell cycle</topic><topic>Cell Cycle - physiology</topic><topic>Cell Differentiation - physiology</topic><topic>Cell Division - physiology</topic><topic>Cell Line</topic><topic>Cell proliferation</topic><topic>Cervical cancer</topic><topic>Cervix</topic><topic>Crk-Associated Substrate Protein - genetics</topic><topic>Crk-Associated Substrate Protein - metabolism</topic><topic>Deactivation</topic><topic>DNA-Binding Proteins - genetics</topic><topic>DNA-Binding Proteins - metabolism</topic><topic>E2F protein</topic><topic>Ectopic expression</topic><topic>Female</topic><topic>Flow cytometry</topic><topic>G2 phase</topic><topic>HeLa Cells</topic><topic>Histology</topic><topic>Human papillomavirus</topic><topic>Human papillomavirus 16 - metabolism</topic><topic>Human papillomavirus 16 - pathogenicity</topic><topic>Human papillomavirus 18 - 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In addition, recent studies have focused on the vital role of the p130 pocket protein as an oncosuppressor to limit the expression of E2F transcription factors required for cell cycle progression. In view of this, the current study was conducted to investigate the mechanism by which transfection with HPV16/18 E7 leads to the deregulation of the host cell cycle, altering the localisation of p130, and expression of differentiation genes in Human Keratinocytes (HaCaT) cells. Co-immunoprecipitation, Western blot analysis, immunofluorescence microscopy, flow cytometry, quantitative-Polymerase Chain Reaction (qPCR), and the inhibition of p130 by MG132 inhibitor were employed to investigate the loss of p130 and its disruption in HPV 16/18 E7-transfected HaCaT cells. The HPV16- and HPV18-transformed cells, known as CaSki and HeLa, respectively, were also used to complement the ectopic expressions of E7 in HaCaT cells. Normal keratinocytes displayed higher level of p130 expression than HPV-transformed cells. In addition, the immunofluorescence analysis revealed that both HPV 16/18 E7-transfected HaCaT and HPV-transformed cells exhibited higher level of cytoplasmic p130 compared to nuclear p130. A significant increase in the number of S/G2 phase cells in HPV-transformed cells was also recorded since E7 has been shown to stimulate proliferation through the deactivation of Retinoblastoma Protein (pRB)-dependent G1/S checkpoint. Furthermore, the findings recorded the down-regulation of keratinocyte differentiation markers, namely p130, keratin10, and involucrin. The proteasomal degradation of the exported p130 confirmed the cellular localisation pattern of p130, which was commonly observed in cancerous cells. The findings provide strong evidence that the localisation of nuclear p130 nuclear was disrupted by HPV16/18 E7 led to the deregulation of the cell cycle and the impairment of cellular differentiation ultimately lead to cellular transformation.</abstract><cop>Dordrecht</cop><pub>Springer Netherlands</pub><pmid>34169395</pmid><doi>10.1007/s11033-021-06509-4</doi><tpages>13</tpages><orcidid>https://orcid.org/0000-0002-5164-4362</orcidid><orcidid>https://orcid.org/0000-0003-3439-9104</orcidid><orcidid>https://orcid.org/0000-0001-6562-2247</orcidid><orcidid>https://orcid.org/0000-0002-3951-8136</orcidid></addata></record>
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subjects Alphapapillomavirus - genetics
Alphapapillomavirus - pathogenicity
Animal Anatomy
Animal Biochemistry
Biomedical and Life Sciences
Cancer
Cell cycle
Cell Cycle - physiology
Cell Differentiation - physiology
Cell Division - physiology
Cell Line
Cell proliferation
Cervical cancer
Cervix
Crk-Associated Substrate Protein - genetics
Crk-Associated Substrate Protein - metabolism
Deactivation
DNA-Binding Proteins - genetics
DNA-Binding Proteins - metabolism
E2F protein
Ectopic expression
Female
Flow cytometry
G2 phase
HeLa Cells
Histology
Human papillomavirus
Human papillomavirus 16 - metabolism
Human papillomavirus 16 - pathogenicity
Human papillomavirus 18 - metabolism
Human papillomavirus 18 - pathogenicity
Humans
Immunofluorescence
Immunoprecipitation
Keratinocytes
Keratinocytes - metabolism
Life Sciences
Localization
Morphology
Oncogene Proteins, Viral - genetics
Oncogene Proteins, Viral - metabolism
Original Article
Papillomaviridae - genetics
Papillomavirus E7 Proteins - genetics
Papillomavirus E7 Proteins - metabolism
Papillomavirus Infections - genetics
Polymerase chain reaction
Proteasomes
Repressor Proteins - genetics
Retina
Retinoblastoma
Retinoblastoma protein
Retinoblastoma-Like Protein p130 - genetics
Transcription factors
Transfection
Transformed cells
Uterine Cervical Neoplasms - metabolism
title Proteasomal degradation of p130 facilitate cell cycle deregulation and impairment of cellular differentiation in high-risk Human Papillomavirus 16 and 18 E7 transfected cells
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