Polymorphisms in the P2X7 receptor, and differential expression of Toll-like receptor-mediated cytokines and defensins, in a Canadian Indigenous group
Abstract Canadian Indigenous peoples (First Nations and Inuit) exhibit a high burden of infectious diseases including tuberculosis influenced by societal factors, and biological determinants. Toll-like receptor (TLR)-mediated innate immune responses are the first line of defence against infections....
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2019
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Online Access: | http://dx.doi.org/10.1038/s41598-019-50596-0 http://www.nature.com/articles/s41598-019-50596-0.pdf http://www.nature.com/articles/s41598-019-50596-0 |
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crspringernat:10.1038/s41598-019-50596-0 2023-05-15T16:17:00+02:00 Polymorphisms in the P2X7 receptor, and differential expression of Toll-like receptor-mediated cytokines and defensins, in a Canadian Indigenous group Semple, Catlin Choi, Ka-Yee Grace Kroeker, Andrea Denechezhe, Lizette Orr, Pamela Mookherjee, Neeloffer Larcombe, Linda Lynne Ransby – Gerry Hodson Infectious Disease Research Fund Dr. Paul H.T. Thorlakson Foundation Fund Research Manitoba 2019 http://dx.doi.org/10.1038/s41598-019-50596-0 http://www.nature.com/articles/s41598-019-50596-0.pdf http://www.nature.com/articles/s41598-019-50596-0 en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Scientific Reports volume 9, issue 1 ISSN 2045-2322 Multidisciplinary journal-article 2019 crspringernat https://doi.org/10.1038/s41598-019-50596-0 2022-01-04T15:21:54Z Abstract Canadian Indigenous peoples (First Nations and Inuit) exhibit a high burden of infectious diseases including tuberculosis influenced by societal factors, and biological determinants. Toll-like receptor (TLR)-mediated innate immune responses are the first line of defence against infections. We examined the production of a panel of 30 cytokines in peripheral blood-derived mononuclear cells (PBMC) isolated from Indigenous and non-Indigenous participants, following stimulation with five different TLR ligands. The levels of TLR-induced pro-inflammatory cytokines such as IL-12/23p40, IL-16, and IFN-γ, and chemokines (MCP-4, MDC and eotaxin) were different between Indigenous compared to non-Indigenous participants. Antimicrobial cationic host defence peptides (CHDP) induced by TLR activation are critical for resolution of infections and modulate the TLR-to-NFκB pathway to alter downstream cytokine responses. Therefore, we examined the expression of human CHDP defensins and cathelicidin in PBMC. mRNA expression of genes encoding for def-A1 and def-B1 were significantly higher following stimulation with TLR ligands in Indigenous compared to non-Indigenous participants. The purinergic receptor P2X7 known to be activated by ATP released following TLR stimulation, is a receptor for CHDP. Therefore, we further examined single nucleotide polymorphisms (SNP) in P2X7. Indigenous participants had a significantly higher percentage of a P2X7 SNP which is associated with reduced function and lower ability to clear infections. These results suggest that a higher frequency of non-functional P2X7 receptors may influence the activity of downstream immune mediators required for resolution of infections such as pro-inflammatory cytokines and CHDP defensins, thus contributing to higher burden of infections in Indigenous population. Article in Journal/Newspaper First Nations inuit Springer Nature (via Crossref) Scientific Reports 9 1 |
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Springer Nature (via Crossref) |
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English |
topic |
Multidisciplinary |
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Multidisciplinary Semple, Catlin Choi, Ka-Yee Grace Kroeker, Andrea Denechezhe, Lizette Orr, Pamela Mookherjee, Neeloffer Larcombe, Linda Polymorphisms in the P2X7 receptor, and differential expression of Toll-like receptor-mediated cytokines and defensins, in a Canadian Indigenous group |
topic_facet |
Multidisciplinary |
description |
Abstract Canadian Indigenous peoples (First Nations and Inuit) exhibit a high burden of infectious diseases including tuberculosis influenced by societal factors, and biological determinants. Toll-like receptor (TLR)-mediated innate immune responses are the first line of defence against infections. We examined the production of a panel of 30 cytokines in peripheral blood-derived mononuclear cells (PBMC) isolated from Indigenous and non-Indigenous participants, following stimulation with five different TLR ligands. The levels of TLR-induced pro-inflammatory cytokines such as IL-12/23p40, IL-16, and IFN-γ, and chemokines (MCP-4, MDC and eotaxin) were different between Indigenous compared to non-Indigenous participants. Antimicrobial cationic host defence peptides (CHDP) induced by TLR activation are critical for resolution of infections and modulate the TLR-to-NFκB pathway to alter downstream cytokine responses. Therefore, we examined the expression of human CHDP defensins and cathelicidin in PBMC. mRNA expression of genes encoding for def-A1 and def-B1 were significantly higher following stimulation with TLR ligands in Indigenous compared to non-Indigenous participants. The purinergic receptor P2X7 known to be activated by ATP released following TLR stimulation, is a receptor for CHDP. Therefore, we further examined single nucleotide polymorphisms (SNP) in P2X7. Indigenous participants had a significantly higher percentage of a P2X7 SNP which is associated with reduced function and lower ability to clear infections. These results suggest that a higher frequency of non-functional P2X7 receptors may influence the activity of downstream immune mediators required for resolution of infections such as pro-inflammatory cytokines and CHDP defensins, thus contributing to higher burden of infections in Indigenous population. |
author2 |
Lynne Ransby – Gerry Hodson Infectious Disease Research Fund Dr. Paul H.T. Thorlakson Foundation Fund Research Manitoba |
format |
Article in Journal/Newspaper |
author |
Semple, Catlin Choi, Ka-Yee Grace Kroeker, Andrea Denechezhe, Lizette Orr, Pamela Mookherjee, Neeloffer Larcombe, Linda |
author_facet |
Semple, Catlin Choi, Ka-Yee Grace Kroeker, Andrea Denechezhe, Lizette Orr, Pamela Mookherjee, Neeloffer Larcombe, Linda |
author_sort |
Semple, Catlin |
title |
Polymorphisms in the P2X7 receptor, and differential expression of Toll-like receptor-mediated cytokines and defensins, in a Canadian Indigenous group |
title_short |
Polymorphisms in the P2X7 receptor, and differential expression of Toll-like receptor-mediated cytokines and defensins, in a Canadian Indigenous group |
title_full |
Polymorphisms in the P2X7 receptor, and differential expression of Toll-like receptor-mediated cytokines and defensins, in a Canadian Indigenous group |
title_fullStr |
Polymorphisms in the P2X7 receptor, and differential expression of Toll-like receptor-mediated cytokines and defensins, in a Canadian Indigenous group |
title_full_unstemmed |
Polymorphisms in the P2X7 receptor, and differential expression of Toll-like receptor-mediated cytokines and defensins, in a Canadian Indigenous group |
title_sort |
polymorphisms in the p2x7 receptor, and differential expression of toll-like receptor-mediated cytokines and defensins, in a canadian indigenous group |
publisher |
Springer Science and Business Media LLC |
publishDate |
2019 |
url |
http://dx.doi.org/10.1038/s41598-019-50596-0 http://www.nature.com/articles/s41598-019-50596-0.pdf http://www.nature.com/articles/s41598-019-50596-0 |
genre |
First Nations inuit |
genre_facet |
First Nations inuit |
op_source |
Scientific Reports volume 9, issue 1 ISSN 2045-2322 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s41598-019-50596-0 |
container_title |
Scientific Reports |
container_volume |
9 |
container_issue |
1 |
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1766002849259454464 |