Cargando…

Differential baseline and response profile to IFN-γ gene transduction of IL-6/IL-6 receptor-α secretion discriminate primary tumors versus bone marrow metastases of nasopharyngeal carcinomas in culture

BACKGROUND: Understanding of immunobiology of bone marrow metastases (designated BM-NPC) versus primary tumors (P-NPC) of the nasopharynx is far from complete. The aim of this study was to determine if there would be differences between cultured P-NPCs and BM-NPCs with respect to (i) constitutive IL...

Descripción completa

Detalles Bibliográficos
Autores principales: Chou, Andy Shau-Bin, Wang, Hsin-Yi, Chen, Hung-Chang, Tsai, Ming-Hsiu, Chuang, Cheng-Keng, Liao, Shuen-Kuei
Formato: Texto
Lenguaje:English
Publicado: BioMed Central 2009
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2702388/
https://www.ncbi.nlm.nih.gov/pubmed/19497133
http://dx.doi.org/10.1186/1471-2407-9-169
_version_ 1782168773500862464
author Chou, Andy Shau-Bin
Wang, Hsin-Yi
Chen, Hung-Chang
Tsai, Ming-Hsiu
Chuang, Cheng-Keng
Liao, Shuen-Kuei
author_facet Chou, Andy Shau-Bin
Wang, Hsin-Yi
Chen, Hung-Chang
Tsai, Ming-Hsiu
Chuang, Cheng-Keng
Liao, Shuen-Kuei
author_sort Chou, Andy Shau-Bin
collection PubMed
description BACKGROUND: Understanding of immunobiology of bone marrow metastases (designated BM-NPC) versus primary tumors (P-NPC) of the nasopharynx is far from complete. The aim of this study was to determine if there would be differences between cultured P-NPCs and BM-NPCs with respect to (i) constitutive IL-6 and the IL-6 receptor gp80 subunit (IL-6Rα) levels in the spent media of nontransduced cells, and (ii) IL-6 and IL-6Rα levels in the spent media of cells transduced with a retroviral vector containing the IFN-γ gene. METHODS: A panel of NPC cell lines were transduced with the IFN-γ gene through a retroviral vector. Four clonal sublines were isolated via limiting dilution methods. Cytofluorometric analysis was performed for the detection of cell surface antigens of HLA class I, HLA class II and ICAM-1. ELISA was used to assay for IFN-γ, IL-6 and IL-6Rα in the spent media of cultured cell lines. RESULTS: Our results showed that in day 3 culture supernatants, low levels of soluble IL-6 were detected in 5/5 cultured tumors derived from P-NPCs, while much higher constitutive levels of IL-6 were detected in 3/3 metastasis-derived NPC cell lines including one originated from ascites; the difference was significant (p = 0.025). An inverse relationship was found between IL-6Rα and IL-6 in their release levels in cultured P-NPCs and metastasis-derived NPCs. In IFN-γ-transduced-P-NPCs, IL-6 production increased and yet IL-6Rα decreased substantially, as compared to nontransduced counterparts. At variance with P-NPC cells, the respective ongoing IL-6 and IL-6Rα release patterns of BM-NPC cells were not impeded as much following IFN-γ transduction. These observations were confirmed by extended kinetic studies with representative NPC cell lines and clonal sublines. The latter observation with the clonal sublines also indicates that selection for high IL-6 or low IL-6Rα producing subpopulations did not occur as a result of IFN-γ-transduction process. P-NPCs, which secreted constitutively only marginal levels of IFN-γ (8.4 ~ 10.5 pg/ml), could be enhanced to produce higher levels of IFN-γ (6.8- to 10.3-fold increase) after IFN-γ transduction. Unlike P-NPCs, BM-NPCs spontaneously released IFN-γ at moderate levels (83.8 ~ 100.7 pg/ml), which were enhanced by 1.3- to 2.2-fold in the spent media of their IFN-γ-transduced counterparts. CONCLUSION: Our results showed that cultured P-NPCs and BM-NPCs could be distinguished from one another on the basis of their differential baseline secretion pattern of IFN-γ, IL-6 and IL-6Rα, and their differential response profiles to IFN-γ gene transfer of the production of these three soluble molecules. These results suggest that the IL-6 and IFN-γ pathways in a background of genetic instability be involved in the acquisition of metastatic behaviour in BM-NPCs.
format Text
id pubmed-2702388
institution National Center for Biotechnology Information
language English
publishDate 2009
publisher BioMed Central
record_format MEDLINE/PubMed
spelling pubmed-27023882009-06-27 Differential baseline and response profile to IFN-γ gene transduction of IL-6/IL-6 receptor-α secretion discriminate primary tumors versus bone marrow metastases of nasopharyngeal carcinomas in culture Chou, Andy Shau-Bin Wang, Hsin-Yi Chen, Hung-Chang Tsai, Ming-Hsiu Chuang, Cheng-Keng Liao, Shuen-Kuei BMC Cancer Research Article BACKGROUND: Understanding of immunobiology of bone marrow metastases (designated BM-NPC) versus primary tumors (P-NPC) of the nasopharynx is far from complete. The aim of this study was to determine if there would be differences between cultured P-NPCs and BM-NPCs with respect to (i) constitutive IL-6 and the IL-6 receptor gp80 subunit (IL-6Rα) levels in the spent media of nontransduced cells, and (ii) IL-6 and IL-6Rα levels in the spent media of cells transduced with a retroviral vector containing the IFN-γ gene. METHODS: A panel of NPC cell lines were transduced with the IFN-γ gene through a retroviral vector. Four clonal sublines were isolated via limiting dilution methods. Cytofluorometric analysis was performed for the detection of cell surface antigens of HLA class I, HLA class II and ICAM-1. ELISA was used to assay for IFN-γ, IL-6 and IL-6Rα in the spent media of cultured cell lines. RESULTS: Our results showed that in day 3 culture supernatants, low levels of soluble IL-6 were detected in 5/5 cultured tumors derived from P-NPCs, while much higher constitutive levels of IL-6 were detected in 3/3 metastasis-derived NPC cell lines including one originated from ascites; the difference was significant (p = 0.025). An inverse relationship was found between IL-6Rα and IL-6 in their release levels in cultured P-NPCs and metastasis-derived NPCs. In IFN-γ-transduced-P-NPCs, IL-6 production increased and yet IL-6Rα decreased substantially, as compared to nontransduced counterparts. At variance with P-NPC cells, the respective ongoing IL-6 and IL-6Rα release patterns of BM-NPC cells were not impeded as much following IFN-γ transduction. These observations were confirmed by extended kinetic studies with representative NPC cell lines and clonal sublines. The latter observation with the clonal sublines also indicates that selection for high IL-6 or low IL-6Rα producing subpopulations did not occur as a result of IFN-γ-transduction process. P-NPCs, which secreted constitutively only marginal levels of IFN-γ (8.4 ~ 10.5 pg/ml), could be enhanced to produce higher levels of IFN-γ (6.8- to 10.3-fold increase) after IFN-γ transduction. Unlike P-NPCs, BM-NPCs spontaneously released IFN-γ at moderate levels (83.8 ~ 100.7 pg/ml), which were enhanced by 1.3- to 2.2-fold in the spent media of their IFN-γ-transduced counterparts. CONCLUSION: Our results showed that cultured P-NPCs and BM-NPCs could be distinguished from one another on the basis of their differential baseline secretion pattern of IFN-γ, IL-6 and IL-6Rα, and their differential response profiles to IFN-γ gene transfer of the production of these three soluble molecules. These results suggest that the IL-6 and IFN-γ pathways in a background of genetic instability be involved in the acquisition of metastatic behaviour in BM-NPCs. BioMed Central 2009-06-05 /pmc/articles/PMC2702388/ /pubmed/19497133 http://dx.doi.org/10.1186/1471-2407-9-169 Text en Copyright ©2009 Chou et al; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Chou, Andy Shau-Bin
Wang, Hsin-Yi
Chen, Hung-Chang
Tsai, Ming-Hsiu
Chuang, Cheng-Keng
Liao, Shuen-Kuei
Differential baseline and response profile to IFN-γ gene transduction of IL-6/IL-6 receptor-α secretion discriminate primary tumors versus bone marrow metastases of nasopharyngeal carcinomas in culture
title Differential baseline and response profile to IFN-γ gene transduction of IL-6/IL-6 receptor-α secretion discriminate primary tumors versus bone marrow metastases of nasopharyngeal carcinomas in culture
title_full Differential baseline and response profile to IFN-γ gene transduction of IL-6/IL-6 receptor-α secretion discriminate primary tumors versus bone marrow metastases of nasopharyngeal carcinomas in culture
title_fullStr Differential baseline and response profile to IFN-γ gene transduction of IL-6/IL-6 receptor-α secretion discriminate primary tumors versus bone marrow metastases of nasopharyngeal carcinomas in culture
title_full_unstemmed Differential baseline and response profile to IFN-γ gene transduction of IL-6/IL-6 receptor-α secretion discriminate primary tumors versus bone marrow metastases of nasopharyngeal carcinomas in culture
title_short Differential baseline and response profile to IFN-γ gene transduction of IL-6/IL-6 receptor-α secretion discriminate primary tumors versus bone marrow metastases of nasopharyngeal carcinomas in culture
title_sort differential baseline and response profile to ifn-γ gene transduction of il-6/il-6 receptor-α secretion discriminate primary tumors versus bone marrow metastases of nasopharyngeal carcinomas in culture
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2702388/
https://www.ncbi.nlm.nih.gov/pubmed/19497133
http://dx.doi.org/10.1186/1471-2407-9-169
work_keys_str_mv AT chouandyshaubin differentialbaselineandresponseprofiletoifnggenetransductionofil6il6receptorasecretiondiscriminateprimarytumorsversusbonemarrowmetastasesofnasopharyngealcarcinomasinculture
AT wanghsinyi differentialbaselineandresponseprofiletoifnggenetransductionofil6il6receptorasecretiondiscriminateprimarytumorsversusbonemarrowmetastasesofnasopharyngealcarcinomasinculture
AT chenhungchang differentialbaselineandresponseprofiletoifnggenetransductionofil6il6receptorasecretiondiscriminateprimarytumorsversusbonemarrowmetastasesofnasopharyngealcarcinomasinculture
AT tsaiminghsiu differentialbaselineandresponseprofiletoifnggenetransductionofil6il6receptorasecretiondiscriminateprimarytumorsversusbonemarrowmetastasesofnasopharyngealcarcinomasinculture
AT chuangchengkeng differentialbaselineandresponseprofiletoifnggenetransductionofil6il6receptorasecretiondiscriminateprimarytumorsversusbonemarrowmetastasesofnasopharyngealcarcinomasinculture
AT liaoshuenkuei differentialbaselineandresponseprofiletoifnggenetransductionofil6il6receptorasecretiondiscriminateprimarytumorsversusbonemarrowmetastasesofnasopharyngealcarcinomasinculture