{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,25]],"date-time":"2026-07-25T05:46:46Z","timestamp":1784958406463,"version":"3.55.0"},"reference-count":66,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2023,8,12]],"date-time":"2023-08-12T00:00:00Z","timestamp":1691798400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004281","name":"Polish National Science Centre (NCN)","doi-asserted-by":"publisher","award":["2021\/41\/B\/NZ6\/01765"],"award-info":[{"award-number":["2021\/41\/B\/NZ6\/01765"]}],"id":[{"id":"10.13039\/501100004281","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004281","name":"Polish National Science Centre (NCN)","doi-asserted-by":"publisher","award":["Pbmb166"],"award-info":[{"award-number":["Pbmb166"]}],"id":[{"id":"10.13039\/501100004281","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004281","name":"Polish National Science Centre (NCN)","doi-asserted-by":"publisher","award":["PBsd167"],"award-info":[{"award-number":["PBsd167"]}],"id":[{"id":"10.13039\/501100004281","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100010621","name":"Medical University of Lublin","doi-asserted-by":"publisher","award":["2021\/41\/B\/NZ6\/01765"],"award-info":[{"award-number":["2021\/41\/B\/NZ6\/01765"]}],"id":[{"id":"10.13039\/501100010621","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100010621","name":"Medical University of Lublin","doi-asserted-by":"publisher","award":["Pbmb166"],"award-info":[{"award-number":["Pbmb166"]}],"id":[{"id":"10.13039\/501100010621","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100010621","name":"Medical University of Lublin","doi-asserted-by":"publisher","award":["PBsd167"],"award-info":[{"award-number":["PBsd167"]}],"id":[{"id":"10.13039\/501100010621","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Cells"],"abstract":"<jats:p>The human immune system is a complex network of cells, tissues, and molecules that work together to defend the body against pathogens and maintain overall health. However, in some individuals, the immune system fails to function correctly, leading to immunodeficiencies. Immunodeficiencies can be classified into primary (PID) and secondary (SID) types, each with distinct underlying causes and manifestations. Toll-like receptors (TLRs), as key components of the immune system, have been implicated in the pathogenesis of both PID and SID. In this study, we aim to unravel the intricate involvement of TLR2, TLR4, TLR3, TLR7, TLR8, and TLR9 in the immunopathogenesis of common variable immunodeficiency\u2014CVID (as PID)\u2014and chronic lymphocytic leukemia\u2014CLL (as SID). The obtained results indicate a significant increase in the percentage of all tested subpopulations of T lymphocytes and B lymphocytes showing positive expression of all analyzed TLRs in patients with CVID and CLL compared to healthy volunteers, constituting the control group, which is also confirmed by analysis of the concentration of soluble forms of these receptors in the plasma of patients. Furthermore, patients diagnosed with CVID are characterized by the percentage of all lymphocytes showing positive expression of the tested TLR2, TLR4, TLR3, and TLR9 and their plasma concentrations in relation to patients with CLL. By investigating the functions and interactions of TLRs within the immune system, we seek to shed light on their critical role in the development and progression of these immunodeficiencies. Through a comprehensive analysis of the literature and presented experimental data, we hope to deepen our understanding of the complex mechanisms by which TLRs contribute to the pathogenesis of PID and SID. Ultimately, our findings may provide valuable insights into developing targeted therapeutic strategies to mitigate the impact of these disorders on those affected by immunodeficiency.<\/jats:p>","DOI":"10.3390\/cells12162055","type":"journal-article","created":{"date-parts":[[2023,8,14]],"date-time":"2023-08-14T10:20:14Z","timestamp":1692008414000},"page":"2055","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Unraveling the Role of Toll-like Receptors in the Immunopathogenesis of Selected Primary and Secondary Immunodeficiencies"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9530-6659","authenticated-orcid":false,"given":"Paulina","family":"Mertowska","sequence":"first","affiliation":[{"name":"Department of Experimental Immunology, Medical University of Lublin, 20-093 Lublin, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Konrad","family":"Smolak","sequence":"additional","affiliation":[{"name":"Department of Experimental Immunology, Medical University of Lublin, 20-093 Lublin, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7121-1396","authenticated-orcid":false,"given":"Sebastian","family":"Mertowski","sequence":"additional","affiliation":[{"name":"Department of Experimental Immunology, Medical University of Lublin, 20-093 Lublin, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0451-4741","authenticated-orcid":false,"given":"Ewelina","family":"Grywalska","sequence":"additional","affiliation":[{"name":"Department of Experimental Immunology, Medical University of Lublin, 20-093 Lublin, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,8,12]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"70","DOI":"10.1016\/j.jaci.2022.11.001","article-title":"Immune Dysregulation","volume":"151","author":"Long","year":"2023","journal-title":"J. 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