Expression patterns for nicotinic acetylcholine receptor subunit genes in smoking-related lung cancers
| Autor: | Gema Atienza, Carmen Fernández-Capitán, Anna Bordas, Carolina Martín-Sánchez, Isabel Esteban-Rodríguez, Carmen Montiel, Francisco Arnalich, J. J. Rios, Laura Guerra-Pastrián, Javier de Castro, José Luis Cedillo |
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| Přispěvatelé: | UAM. Departamento de Farmacología, UAM. Departamento de Medicina, Instituto de Investigación Sanitaria Hospital Universitario de La Paz (IdiPAZ) |
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Pathology medicine.medical_specialty nAChRs Medicina NSCLC medicine.disease_cause tobacco Nicotine 03 medical and health sciences 0302 clinical medicine medicine Adenocarcinoma of the lung Lung cancer Squamous-cell carcinoma of the lung biology business.industry CHRNA5 CHRNA7 Farmacia lung adenocarcinoma medicine.disease 030104 developmental biology Oncology squamous cell carcinoma of the lung 030220 oncology & carcinogenesis biology.protein Cancer research Adenocarcinoma Carcinogenesis business Research Paper medicine.drug |
| Zdroj: | Oncotarget Repositorio Institucional de la Consejería de Sanidad de la Comunidad de Madrid Consejería de Sanidad de la Comunidad de Madrid Biblos-e Archivo. Repositorio Institucional de la UAM instname |
| ISSN: | 1949-2553 |
| DOI: | 10.18632/oncotarget.18948 |
| Popis: | Cigarette smoking is associated with increased risk for all histologic types of lung cancer, but why the strength of this association is stronger for squamous cell carcinoma than adenocarcinoma of the lung (SQC-L, ADC-L) is not fully understood. Because nicotine and tobacco-specific nitrosamines contribute to carcinogenesis by activating nicotinic acetylcholine receptors (nAChRs) on lung tumors and epithelial cells, we investigated whether differential expression of nAChR subtypes in these tumors could explain their different association with smoking. Expression of nAChR subunit genes in paired tumor and non-tumor lung specimens from 40 SQC-L and 38 ADC-L patients was analyzed by quantitative PCR. Compared to normal lung, both tumors share: i) transcriptional dysregulation of CHRNA3/CHRNA5/CHRNB4 (α3, α5, β4 subunits) at the chromosomal locus that predisposes to lung cancer; and ii) decreased expression of CHRFAM7A (dupα7 subunit); this last subunit negatively modulates α7-nAChR activity in oocytes. In contrast, CHRNA7 (α7 subunit) expression was increased in SQC-L, particularly in smokers and non-survivors, while CHRNA4 (α4 subunit) expression was decreased in ADC-L. Thus, over-representation of cancer-stimulating α7-nAChR in SQC-L, also potentiated by smoking, and underrepresentation of cancer-inhibiting α4β2-nAChR in ADC-L could explain the different tobacco influences on the tumorigenic process in each cancer type This study was supported by grants to C. Montiel and F. Arnalich from the Ministry of Economy, Industry and Competitiveness, Government of Spain (SAF2014-56623-R) and Foundation “Mutua Madrileña Investigación Biomédica” (FMM2011), Spain. A.B. is recipient of a fellowship (Beca FPI, Universidad Autónoma Madrid). J.L.C. and C.M.S. are recipients of fellowships (Beca FPU from Ministerio de Educación, Cultura y Deporte and Beca FPI from Ministry of Economy, Industry and Competitiveness, Government of Spain, respectively) |
| Databáze: | OpenAIRE |
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