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Arvizu-Hernandez E, Hernandez-Guerrero CJ, Alvarez-Rios E, Gariglio P, Cornejo-Garrido J, Ocadiz-Delgado R. Laurencia johnstonii extract reverses early lesions in the K14E7HPV16 murine cervical carcinogenesis model. J Med Virol 2024; 96:e29571. [PMID: 38563330 DOI: 10.1002/jmv.29571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 03/01/2024] [Accepted: 03/18/2024] [Indexed: 04/04/2024]
Abstract
Persistent infection with high-risk human papillomavirus (HR-HPV) is a well-established risk factor to the development of cervical intraepithelial neoplasia (CIN), a condition that can progress to cervical cancer (CC) a major health problem worldwide. Recently, there has been growing interest in exploring alternative therapies utilizing natural products, among which is the algae species Laurencia johnstonii Setchell & Gardner, 1924 (L. johnstonii), proposed for the management of precancerous lesions. The aim of this work was to determine the effect of an organic extract from L. johnstonii (ELj) in early cervical lesions (CIN 1). These CIN 1 lesions were generated in a murine model expressing the HR-HPV16 E7 oncoprotein (K14E7HPV transgenic mice) with a single exogenous hormonal stimulus using 17β-estradiol. The histopathological studies, the determination of cell proliferation and of the apoptotic levels in cervical tissue, showed that, seven doses of ELj (30 mg/kg weight per day diluted in a DMSO-saline solution [1:7]) lead to recovery the architecture of cervical epithelium. Accordingly, in the transgenic mice it was observed a statistically significant decrease of the PCNA expression levels, a marker of cell proliferation, and a statistically significant increase in the apoptosis levels using Caspase 3 as a marker. In addition, we determined the expression levels of the tumor suppressor miR-218 and the oncomiRNA miR-21. Interestingly, our results may suggest that ELj treatment tended to restore the normal expression of both miRNAs as compared with controls being more evident in the non-transgenic induced mice. Differences of p < 0.05 were considered statistically significant through the whole study. Based on these results, we propose that the use of ELj could be an alternative for the treatment of cervical early lesions.
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Affiliation(s)
- Erandi Arvizu-Hernandez
- Laboratory of Cellular Biology and Natural Products I, Escuela Nacional de Medicina y Homeopatía, Instituto Politécnico Nacional, La Paz, Mexico
- Department of Genetics and Molecular Biology, Centro de Investigación y de Estudios Avanzados IPN, Ciudad de Mexico, Mexico
| | - Claudia Judith Hernandez-Guerrero
- Department of Technologies Development, Centro Interdisciplinario de Ciencias Marinas, Instituto Politécnico Nacional, La Paz B.C.S., Mexico
| | - Elizabeth Alvarez-Rios
- Department of Genetics and Molecular Biology, Centro de Investigación y de Estudios Avanzados IPN, Ciudad de Mexico, Mexico
| | - Patricio Gariglio
- Department of Genetics and Molecular Biology, Centro de Investigación y de Estudios Avanzados IPN, Ciudad de Mexico, Mexico
| | - Jorge Cornejo-Garrido
- Laboratory of Cellular Biology and Natural Products I, Escuela Nacional de Medicina y Homeopatía, Instituto Politécnico Nacional, La Paz, Mexico
| | - Rodolfo Ocadiz-Delgado
- Department of Genetics and Molecular Biology, Centro de Investigación y de Estudios Avanzados IPN, Ciudad de Mexico, Mexico
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Ocadiz-Delgado R, Serafin-Higuera N, Alvarez-Rios E, García-Villa E, Tinajero-Rodríguez M, Rodríguez-Uribe G, Escobar-Wilches DC, Estela Albino-Sánchez M, Ramírez-Rosas A, Sierra-Santoyo A, Hernández-Pando R, Lambert P, Gariglio P. Vitamin A deficiency in K14E7HPV expressing transgenic mice facilitates the formation of malignant cervical lesions. APMIS 2021; 129:512-523. [PMID: 34046932 DOI: 10.1111/apm.13159] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Accepted: 05/17/2021] [Indexed: 12/25/2022]
Abstract
Infection with high-risk human papillomavirus (HR-HPV) is the main cause of cervical cancer (CC), but viral infection alone does not guarantee the development of this malignancy. Indeed, deficiencies of dietary micronutrients could favor cervical cancer development in individuals that harbor HR-HPV infections. The status of retinoid levels, natural and synthetic derivatives of vitamin A, is important in maintaining cellular differentiation of the cervical epithelium. Moreover, many studies show a link between deficient intake of retinoids or alteration of the retinoid receptors and CC development. In spite of this, the effect of vitamin A deficiency (VAD) in presence of HR-HPV oncoproteins on cervical carcinogenesis in vivo has not been reported. Transgenic mice expressing E6 or E7 oncoproteins (K14E6 or K14E7 mice, respectively) were used to evaluate the possible role of VAD in the development of malignant cervical lesions. The survival of the mice in VAD condition was studied, and histopathological analysis and immunohistochemical detection of molecular cancer markers such as the tumor suppressor retinoic acid receptor beta (RARβ), proliferating cell nuclear antigen (PCNA), cleaved caspase 3, and the tumor suppressor protein p16INK4A (inhibitor of CDK4) were performed. Our results show that K14E6/VAD mice showed moderate cervical dysplasia; notably, K14E7/VAD mice developed severe cervical dysplasia and cervical in situ carcinoma at an early age. VAD synergizes with HPV16E7 oncoprotein expression favoring cervical carcinogenesis in vivo.
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Affiliation(s)
- Rodolfo Ocadiz-Delgado
- Departamento de Genética y Biología Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico City, Mexico
| | - Nicolás Serafin-Higuera
- Departamento de Genética y Biología Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico City, Mexico
| | - Elizabeth Alvarez-Rios
- Departamento de Genética y Biología Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico City, Mexico
| | - Enrique García-Villa
- Departamento de Genética y Biología Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico City, Mexico
| | - Manuel Tinajero-Rodríguez
- Departamento de Genética y Biología Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico City, Mexico
| | - Genaro Rodríguez-Uribe
- Departamento de Genética y Biología Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico City, Mexico
| | - Derly-Constanza Escobar-Wilches
- Departamento de Toxicología, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico City, Mexico
| | - Marta Estela Albino-Sánchez
- Departamento de Genética y Biología Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico City, Mexico
| | - Alejandro Ramírez-Rosas
- Departamento de Genética y Biología Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico City, Mexico
| | - Adolfo Sierra-Santoyo
- Departamento de Toxicología, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico City, Mexico
| | - Rogelio Hernández-Pando
- Departamento de Patología, Instituto Nacional de Ciencias Médicas y Nutrición "Salvador Zubirán", Mexico City, Mexico
| | - Paul Lambert
- McArdle Laboratory for Cancer Research, University of Wisconsin, School of Medicine and Public Health, Madison, Wisconsin, USA
| | - Patricio Gariglio
- Departamento de Genética y Biología Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Mexico City, Mexico
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3
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Ocadiz-Delgado R, Cruz-Colin JL, Alvarez-Rios E, Torres-Carrillo A, Hernandez-Mendoza K, Conde-Pérezprina JC, Dominguez-Gomez GI, Garcia-Villa E, Lambert PF, Gariglio P. Expression of miR-34a and miR-15b during the progression of cervical cancer in a murine model expressing the HPV16 E7 oncoprotein. J Physiol Biochem 2021; 77:547-555. [PMID: 33937961 DOI: 10.1007/s13105-021-00818-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 04/20/2021] [Indexed: 01/01/2023]
Abstract
The high-risk human papillomavirus (HR-HPV) E7 oncoprotein appears to be a major determinant for cell immortalization and transformation altering critical processes such as cell proliferation, apoptosis, and immune response. This oncoprotein plays an essential role in cervical carcinogenesis, but other cofactors such as long-term use of hormonal contraceptives are necessary to modulate the risk of cervical cancer (CC). The role of HR-HPVs in the alteration of microRNA (miRNA) levels in persistent viral infections currently remains unclear. The aim of this study was to evaluate the miR-34a and miR-15b expression levels in the murine HPV16K14E7 (K14E7) transgenic model after chronic estrogen (E2) treatment and their involvement in CC. Interestingly, results showed that, although miR-34a expression is elevated by the HPVE7 oncogene, this expression was downregulated in the presence of both the E7 oncoprotein and chronic E2 in cervical carcinoma. On the other hand, miR-15b expression was upregulated along cervical carcinogenesis mainly by the effect of E2. These different changes in the expression levels of miR-34a and miR-15b along cervical carcinogenesis conduced to low apoptosis levels, high cell proliferation and finally, to cancerous cervical tissue development. In this work, we also determined the relative mRNA expression of Cyclin E2 (Ccne2), Cyclin A2 (Ccna2), and B cell lymphoma 2 (Bcl-2) (target genes of miR-34a and miR-15b); Sirtuin 1 (Sirt1), Cmyc, and Bax (miR-34a target genes); and p21/WAF1 (mir15b target gene) and the H-ras oncogene. Given the modifications in the expression levels of miR-34a and miR-15b during the development of cervical cancer, it will be useful to carry out further investigation to confirm them as molecular biomarkers of cancer.
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Affiliation(s)
- Rodolfo Ocadiz-Delgado
- Department of Genetics and Molecular Biology, Centro de Investigación y de Estudios Avanzados del IPN, Av. IPN 2508, Colonia San Pedro Zacatenco Delegación Gustavo A. Madero, 07360, Mexico City, CP, Mexico
| | - Jose-Luis Cruz-Colin
- Department of Genetics and Molecular Biology, Centro de Investigación y de Estudios Avanzados del IPN, Av. IPN 2508, Colonia San Pedro Zacatenco Delegación Gustavo A. Madero, 07360, Mexico City, CP, Mexico.,Department of Genomic Diagnostic, INMEGEN, Mexico City, Mexico, Mexico
| | - Elizabeth Alvarez-Rios
- Department of Genetics and Molecular Biology, Centro de Investigación y de Estudios Avanzados del IPN, Av. IPN 2508, Colonia San Pedro Zacatenco Delegación Gustavo A. Madero, 07360, Mexico City, CP, Mexico
| | - Antonio Torres-Carrillo
- Department of Genetics and Molecular Biology, Centro de Investigación y de Estudios Avanzados del IPN, Av. IPN 2508, Colonia San Pedro Zacatenco Delegación Gustavo A. Madero, 07360, Mexico City, CP, Mexico
| | - Karina Hernandez-Mendoza
- Department of Genetics and Molecular Biology, Centro de Investigación y de Estudios Avanzados del IPN, Av. IPN 2508, Colonia San Pedro Zacatenco Delegación Gustavo A. Madero, 07360, Mexico City, CP, Mexico
| | - Juan-Cristobal Conde-Pérezprina
- Department of Genetics and Molecular Biology, Centro de Investigación y de Estudios Avanzados del IPN, Av. IPN 2508, Colonia San Pedro Zacatenco Delegación Gustavo A. Madero, 07360, Mexico City, CP, Mexico
| | - Guadalupe-Isabel Dominguez-Gomez
- Department of Genetics and Molecular Biology, Centro de Investigación y de Estudios Avanzados del IPN, Av. IPN 2508, Colonia San Pedro Zacatenco Delegación Gustavo A. Madero, 07360, Mexico City, CP, Mexico.,Subdirección de Investigación Clínica, INCan, Mexico City, Mexico, Mexico
| | - Enrique Garcia-Villa
- Department of Genetics and Molecular Biology, Centro de Investigación y de Estudios Avanzados del IPN, Av. IPN 2508, Colonia San Pedro Zacatenco Delegación Gustavo A. Madero, 07360, Mexico City, CP, Mexico
| | - Paul F Lambert
- McArdle Laboratory for Cancer Research, University of Wisconsin Medical School, Madison, WI, USA
| | - Patricio Gariglio
- Department of Genetics and Molecular Biology, Centro de Investigación y de Estudios Avanzados del IPN, Av. IPN 2508, Colonia San Pedro Zacatenco Delegación Gustavo A. Madero, 07360, Mexico City, CP, Mexico.
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4
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Ocadiz-Delgado R, Lizcano-Meneses S, Trejo-Vazquez JA, Conde-Perezprina JC, Garrido-Palmas F, Alvarez-Rios E, García-Villa E, Ruiz G, Illades-Aguiar B, Leyva-Vázquez MA, García-Carrancá A, Gariglio P. Circulating miR-15b, miR-34a and miR-218 as promising novel early low-invasive biomarkers of cervical carcinogenesis. APMIS 2020; 129:70-79. [PMID: 33112434 DOI: 10.1111/apm.13093] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Accepted: 10/20/2020] [Indexed: 12/15/2022]
Abstract
Circulating biological markers, such as miRNAs, hold the greatest possibilities to complement tissue biopsy and clinical diagnostic tests. The objective of this study was to evaluate the relative abundance of three circulating miRNAs in serum from 17 HPV16-positive patients with early cervical lesions known as Low-Grade Squamous Intraepithelial Lesions (LSILs). The expression of circulating microRNAs miR-15b, miR-34a and miR-218 in patients with LSILs was compared to 23 HPV-negative individuals showing normal cervical epithelium (healthy women) and 23 Squamous Cell Carcinoma (SCC) samples. The expression levels of miR-15b remained unchanged while those of miRNAs 34a and 218 were relatively high in serum obtained from LSIL patients in comparison with healthy women (results were statistically significant with a p of < 0.01 or < 0.001). According to previous findings, miR-15b was overexpressed and miRNAs 34a and 218 were underexpressed in serum from SCC patients. Additionally, the mRNA expression levels of some selected gene targets were determined [Cyclin D1 (CCND1), Cyclin E1 (CCNE1), B-cell lymphoma 2 (Bcl-2) and MutS homolog 2 (MSH-2)]. All serum results correlated with tissue samples from the same patients. We propose that circulating microRNAs can be valuable as molecular markers for the early follow-up of cervical carcinogenesis risk.
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Affiliation(s)
| | | | | | | | - Frida Garrido-Palmas
- Department of Genetics and Molecular Biology, CINVESTAV-IPN, Mexico City, Mexico
| | | | - Enrique García-Villa
- Department of Genetics and Molecular Biology, CINVESTAV-IPN, Mexico City, Mexico
| | - Graciela Ruiz
- Department of Genetics and Molecular Biology, CINVESTAV-IPN, Mexico City, Mexico
| | - Berenice Illades-Aguiar
- Faculty of Chemical Biological Sciences, Autonomous University of Guerrero, UAGro, Chilpancingo, Guerrero, Mexico
| | - Marco Antonio Leyva-Vázquez
- Faculty of Chemical Biological Sciences, Autonomous University of Guerrero, UAGro, Chilpancingo, Guerrero, Mexico
| | - Alejandro García-Carrancá
- Biomedical Research Unit in Cancer, IIB, National Autonomous University of Mexico UNAM, Mexico City, Mexico.,National Cancer Institute INCan, SS, Mexico City, Mexico
| | - Patricio Gariglio
- Department of Genetics and Molecular Biology, CINVESTAV-IPN, Mexico City, Mexico
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5
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Munguía-Moreno JA, Díaz-Chavéz J, García-Villa E, Albino-Sanchez ME, Mendoza-Villanueva D, Ocadiz-Delgado R, Bonilla-Delgado J, Marín-Flores A, Cortés-Malagón EM, Alvarez-Rios E, Hidalgo-Miranda A, Üren A, Çelik H, Lambert PF, Gariglio P. Early synergistic interactions between the HPV16‑E7 oncoprotein and 17β-oestradiol for repressing the expression of Granzyme B in a cervical cancer model. Int J Oncol 2018; 53:579-591. [PMID: 29901186 PMCID: PMC6017153 DOI: 10.3892/ijo.2018.4432] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Accepted: 02/23/2018] [Indexed: 12/18/2022] Open
Abstract
Although high-risk human papillomavirus (HR‑HPV) infection has a prominent role in the aetiology of cervical cancer (CC), sex steroid hormones may also be involved in this process; however, the cooperation between oestrogen and HR‑HPV in the early stages of cervical carcinogenesis is poorly understood. Since 17β-oestradiol (E2) and the HPV type 16‑E7 oncoprotein induce CC in transgenic mice, a microarray analysis was performed in the present study to generate global gene expression profiles from 2‑month‑old FVB (non‑transgenic) and K14E7 (transgenic) mice who were left untreated or were treated for 1 month with E2. Upregulation of cancer-related genes that have not been previously reported in the context of CC, including glycerophosphodiester phosphodiesterase domain containing 3, interleukin 1 receptor type II, natriuretic peptide type C, MGAT4 family member C, lecithin-retinol acyltransferase (phosphatidylcholine-retinol-O-acyltransferase) and glucoside xylosyltransferase 2, was observed. Notably, upregulation of the serine (or cysteine) peptidase inhibitor clade B member 9 gene and downregulation of the Granzyme gene family were observed; the repression of the Granzyme B pathway may be a novel mechanism of immune evasion by cancer cells. The present results provide the basis for further studies on early biomarkers of CC risk and synergistic interactions between HR‑HPV and oestrogen.
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Affiliation(s)
- J Antonio Munguía-Moreno
- Department of Genetics and Molecular Biology, Centre for Research and Advanced Studies of the National Polytechnic Institute, México City 07360, México
| | - José Díaz-Chavéz
- Biomedical Unit for Cancer Research, National Autonomous University of Mexico/National Institute of Cancer, México City 14080, México
| | - Enrique García-Villa
- Department of Genetics and Molecular Biology, Centre for Research and Advanced Studies of the National Polytechnic Institute, México City 07360, México
| | - M Estela Albino-Sanchez
- Department of Genetics and Molecular Biology, Centre for Research and Advanced Studies of the National Polytechnic Institute, México City 07360, México
| | - Daniel Mendoza-Villanueva
- Laboratory of Cell and Developmental Signalling, National Cancer Institute at Frederick, Frederick, MD 21702, USA
| | - Rodolfo Ocadiz-Delgado
- Department of Genetics and Molecular Biology, Centre for Research and Advanced Studies of the National Polytechnic Institute, México City 07360, México
| | - José Bonilla-Delgado
- Research Unit of Genetics and Cancer, Juárez Hospital, México City 07760, México
| | - Armando Marín-Flores
- Department of Genetics and Molecular Biology, Centre for Research and Advanced Studies of the National Polytechnic Institute, México City 07360, México
| | | | - Elizabeth Alvarez-Rios
- Department of Genetics and Molecular Biology, Centre for Research and Advanced Studies of the National Polytechnic Institute, México City 07360, México
| | - Alfredo Hidalgo-Miranda
- Department of Oncogenomics, National Institute of Genomic Medicine, México City 14610, México, México
| | - Aykut Üren
- Department of Oncology, Lombardi Comprehensive Cancer Centre, Georgetown University Medical Centre, Washington, DC 20057, USA
| | - Haydar Çelik
- Department of Oncology, Lombardi Comprehensive Cancer Centre, Georgetown University Medical Centre, Washington, DC 20057, USA
| | - Paul F Lambert
- McArdle Laboratory for Cancer Research, University of Wisconsin School of Medicine and Public Health, Madison, WI 53706, USA
| | - Patricio Gariglio
- Department of Genetics and Molecular Biology, Centre for Research and Advanced Studies of the National Polytechnic Institute, México City 07360, México
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Popoca-Cuaya M, Diaz-Chavez J, Hernandez-Monge J, Alvarez-Rios E, Lambert PF, Gariglio P. The HPV16 E6 oncoprotein and UVB irradiation inhibit the tumor suppressor TGFβ pathway in the epidermis of the K14E6 transgenic mouse. Exp Dermatol 2015; 24:430-5. [DOI: 10.1111/exd.12689] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/04/2015] [Indexed: 12/18/2022]
Affiliation(s)
- Marco Popoca-Cuaya
- Department of Genetics and Molecular Biology; Centro de Investigación y de Estudios Avanzados (CINVESTAV); Mexico City Mexico
| | - Jose Diaz-Chavez
- Unit of Biomedical Research in Cancer; UNAM/Instituto Nacional de Cancerología (INCan); Mexico City Mexico
| | - Jesus Hernandez-Monge
- Department of Genetics and Molecular Biology; Centro de Investigación y de Estudios Avanzados (CINVESTAV); Mexico City Mexico
| | - Elizabeth Alvarez-Rios
- Department of Genetics and Molecular Biology; Centro de Investigación y de Estudios Avanzados (CINVESTAV); Mexico City Mexico
| | - Paul F. Lambert
- McArdle Laboratory for Cancer Research; University of Wisconsin School of Medicine and Public Health; Madison WI USA
| | - Patricio Gariglio
- Department of Genetics and Molecular Biology; Centro de Investigación y de Estudios Avanzados (CINVESTAV); Mexico City Mexico
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Díaz L, Ceja-Ochoa I, Restrepo-Angulo I, Larrea F, Avila-Chávez E, García-Becerra R, Borja-Cacho E, Barrera D, Ahumada E, Gariglio P, Alvarez-Rios E, Ocadiz-Delgado R, Garcia-Villa E, Hernández-Gallegos E, Camacho-Arroyo I, Morales A, Ordaz-Rosado D, García-Latorre E, Escamilla J, Sánchez-Peña LC, Saqui-Salces M, Gamboa-Dominguez A, Vera E, Uribe-Ramírez M, Murbartián J, Ortiz CS, Rivera-Guevara C, De Vizcaya-Ruiz A, Camacho J. Estrogens and human papilloma virus oncogenes regulate human ether-à-go-go-1 potassium channel expression. Cancer Res 2009; 69:3300-7. [PMID: 19351862 DOI: 10.1158/0008-5472.can-08-2036] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Ether-à-go-go-1 (Eag1) potassium channels are potential tools for detection and therapy of numerous cancers. Here, we show human Eag1 (hEag1) regulation by cancer-associated factors. We studied hEag1 gene expression and its regulation by estradiol, antiestrogens, and human papillomavirus (HPV) oncogenes (E6/E7). Primary cultures from normal placentas and cervical cancer tissues; tumor cell lines from cervix, choriocarcinoma, keratinocytes, and lung; and normal cell lines from vascular endothelium, keratinocytes, and lung were used. Reverse transcription-PCR (RT-PCR) experiments and Southern blot analysis showed Eag1 expression in all of the cancer cell types, normal trophoblasts, and vascular endothelium, in contrast to normal keratinocytes and lung cells. Estradiol and antiestrogens regulated Eag1 in a cell type-dependent manner. Real-time RT-PCR experiments in HeLa cells showed that Eag1 estrogenic regulation was strongly associated with the expression of estrogen receptor-alpha. Eag1 protein was detected by monoclonal antibodies in normal placenta and placental blood vessels. Patch-clamp recordings in normal trophoblasts treated with estradiol exhibited potassium currents resembling Eag1 channel activity. Eag1 gene expression in keratinocytes depended either on cellular immortalization or the presence of HPV oncogenes. Eag1 protein was found in keratinocytes transfected with E6/E7 HPV oncogenes. Cell proliferation of E6/E7 keratinocytes was decreased by Eag1 antibodies inhibiting channel activity and by the nonspecific Eag1 inhibitors imipramine and astemizole; the latter also increased apoptosis. Our results propose novel oncogenic mechanisms of estrogen/antiestrogen use and HPV infection. We also suggest Eag1 as an early indicator of cell proliferation leading to malignancies and a therapeutic target at early stages of cellular hyperproliferation.
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Affiliation(s)
- Lorenza Díaz
- Departamento de Biología de la Reproducción, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán
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