1
|
Yan K, Liu Q, Huang R, Jiang Y, Bian Z, Li S, Li L, Shen F, Tsuneyama K, Zhang Q, Lian Z, Guan H, Xu B. Spatial transcriptomics reveals prognosis-associated cellular heterogeneity in the papillary thyroid carcinoma microenvironment. Clin Transl Med 2024; 14:e1594. [PMID: 38426403 PMCID: PMC10905537 DOI: 10.1002/ctm2.1594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 01/28/2024] [Accepted: 02/05/2024] [Indexed: 03/02/2024] Open
Abstract
BACKGROUND Papillary thyroid carcinoma (PTC) is the most common malignant endocrine tumour, and its incidence and prevalence are increasing considerably. Cellular heterogeneity in the tumour microenvironment is important for PTC prognosis. Spatial transcriptomics is a powerful technique for cellular heterogeneity study. METHODS In conjunction with a clinical pathologist identification method, spatial transcriptomics was employed to characterise the spatial location and RNA profiles of PTC-associated cells within the tissue sections. The spatial RNA-clinical signature genes for each cell type were extracted and applied to outlining the distribution regions of specific cells on the entire section. The cellular heterogeneity of each cell type was further revealed by ContourPlot analysis, monocle analysis, trajectory analysis, ligand-receptor analysis and Gene Ontology enrichment analysis. RESULTS The spatial distribution region of tumour cells, typical and atypical follicular cells (FCs and AFCs) and immune cells were accurately and comprehensively identified in all five PTC tissue sections. AFCs were identified as a transitional state between FCs and tumour cells, exhibiting a higher resemblance to the latter. Three tumour foci were shared among all patients out of the 13 observed. Notably, tumour foci No. 2 displayed elevated expression levels of genes associated with lower relapse-free survival in PTC patients. We discovered key ligand-receptor interactions, including LAMB3-ITGA2, FN1-ITGA3 and FN1-SDC4, involved in the transition of PTC cells from FCs to AFCs and eventually to tumour cells. High expression of these patterns correlated with reduced relapse-free survival. In the tumour immune microenvironment, reduced interaction between myeloid-derived TGFB1 and TGFBR1 in tumour focus No. 2 contributed to tumourigenesis and increased heterogeneity. The spatial RNA-clinical analysis method developed here revealed prognosis-associated cellular heterogeneity in the PTC microenvironment. CONCLUSIONS The occurrence of tumour foci No. 2 and three enhanced ligand-receptor interactions in the AFC area/tumour foci reduced the relapse-free survival of PTC patients, potentially leading to improved prognostic strategies and targeted therapies for PTC patients.
Collapse
Affiliation(s)
- Kai Yan
- Guangdong Cardiovascular InstituteGuangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangzhouChina
| | - Qing‐Zhi Liu
- Chronic Disease LaboratoryInstitutes for Life SciencesSouth China University of TechnologyGuangzhouChina
| | - Rong‐Rong Huang
- Guangdong Cardiovascular InstituteGuangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangzhouChina
| | - Yi‐Hua Jiang
- Guangdong Cardiovascular InstituteGuangdong Provincial People's HospitalGuangdong Academy of Medical SciencesGuangzhouChina
- Guangdong Provincial Key Laboratory of Artificial Intelligence in Medical Image Analysis and ApplicationGuangzhouChina
| | - Zhen‐Hua Bian
- School of Biomedical Sciences and EngineeringSouth China University of TechnologyGuangzhou International CampusGuangzhouChina
| | - Si‐Jin Li
- Department of Thyroid SurgeryGuangzhou First People's HospitalSouth China University of TechnologyGuangzhouChina
| | - Liang Li
- Medical Research InstituteGuangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences)Southern Medical UniversityGuangzhouChina
| | - Fei Shen
- Department of Thyroid SurgeryGuangzhou First People's HospitalSouth China University of TechnologyGuangzhouChina
| | - Koichi Tsuneyama
- Department of Pathology and Laboratory MedicineInstitute of Biomedical SciencesTokushima University Graduate SchoolTokushimaJapan
| | - Qing‐Ling Zhang
- Department of PathologyGuangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences)Southern Medical UniversityGuangzhouChina
| | - Zhe‐Xiong Lian
- Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences)Southern Medical UniversityGuangzhouChina
| | - Haixia Guan
- Department of EndocrinologyGuangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences)Southern Medical UniversityGuangzhouChina
| | - Bo Xu
- Department of Thyroid SurgeryGuangzhou First People's HospitalSouth China University of TechnologyGuangzhouChina
| |
Collapse
|
2
|
Ma T, Zheng J, Hao P, Zhu X, Huang X. The Gene Rearrangement and Transcriptional Regulation of Non B Cell-Derived Immunoglobulin. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2024; 1445:47-57. [PMID: 38967749 DOI: 10.1007/978-981-97-0511-5_4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/06/2024]
Abstract
Traditionally, immunoglobulin (Ig) expression has been attributed solely to B cells/plasma cells with well-documented and accepted regulatory mechanisms governing Ig expression in B cells. Ig transcription is tightly controlled by a series of transcription factors. However, increasing evidence has recently demonstrated that Ig is not only produced by B cell lineages but also by various types of non-B cells (non-B-Ig). Under physiological conditions, non-B-Ig not only exhibits antibody activity but also regulates cellular biological activities (such as promoting cell proliferation, adhesion, and cytoskeleton protein activity). In pathological conditions, non-B-Ig is implicated in the development of various diseases including tumour, kidney disease, and other immune-related disorders. The mechanisms underline Ig gene rearrangement and transcriptional regulation of Ig genes in non-B cells are not fully understood. However, existing evidence suggests that these mechanisms in non-B cells differ from those in B cells. For instance, non-B-Ig gene rearrangement occurs in an RAG-independent manner; and Oct-1 and Oct-4, rather than Oct-2, are required for the transcriptional regulation of non-B derived Igs. In this chapter, we will describe and compare the mechanisms of gene rearrangement and expression regulation between B-Ig and non-B-Ig.
Collapse
Affiliation(s)
- Teng Ma
- Cancer Research Center, Beijing Chest Hospital, Capital Medical University, Beijing, China.
| | - Jie Zheng
- Hematologic Disease Laboratory, Department of Stem Cell Transplantation, Beijing Children's Hospital, Capital Medical University, Beijing, China
| | - Peng Hao
- Telebrain Medical Technology Co., Ltd., Beijing, China
| | - Xiaohui Zhu
- Department of Obstetrics and Gynecology, Center for Reproductive Medicine, Peking University Third Hospital, Beijing, China
| | - Xinmei Huang
- Department of Respiratory and Critical Care Medicine, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, China
| |
Collapse
|
3
|
Huang J, Zhang J, Zhang L, Wang Z, Fan T, Yin S. The Structure Characteristics and Function of Non B Cell-Derived Immunoglobulin. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2024; 1445:59-71. [PMID: 38967750 DOI: 10.1007/978-981-97-0511-5_5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/06/2024]
Abstract
According to classical immunology theory, immunoglobulin (Ig) is exclusively produced by differentiated B lymphocytes, which exhibit a typical tetrapeptide chain structure and are predominantly present on the surface of B cells and in bodily fluids. B-Ig is one of the critical effector molecules for humoral immune responses specifically recognising antigens and eliminating them. However, mounting evidence has demonstrated that Ig is widely expressed in non B lineage cells, especially malignant ones (referred to as non B-Ig). Interestingly, non B-Ig mainly resides in the cytoplasm and secretion, but to some extent on the cell surface. Furthermore non B-Ig not only displays a tetrapeptide chain structure but also shows free heavy chains and free light chains (FLCs). Additionally, Ig derived from non B cancer cell typically displays unique glycosylation modifications. Functionally, non B-Ig demonstrated diversity and versatility, showing antibody activity and cellular biological activity, such as promoting cell proliferation and survival, and it is implicated in cancer progression and some immune-related diseases, such as renal diseases.
Collapse
Affiliation(s)
- Jing Huang
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing, China.
| | - Jingxuan Zhang
- Platform Biology, Suzhou Abogen Biosciences, Suzhou, Jiangsu, China
| | - Li Zhang
- Division of HIV/AIDS and Sex-Transmitted Virus Vaccines, Institute for Biological Product Control, National Institutes for Food and Drug Control (NIFDC) and WHO Collaborating Center for Standardization and Evaluation of Biologicals, Beijing, China
| | - Zihan Wang
- Department of Nephrology, Peking University Third Hospital, Beijing, China
| | - Tianrui Fan
- Shanghai Discovery and Development Center, Abiosciences, Shanghai, China
| | - Sha Yin
- Xi'an Children's Hospital, Affiliated Children's Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China
| |
Collapse
|
4
|
Hu F, Shao W, Qiu X. Functions and Clinical Relevance of Liver-Derived Immunoglobulins. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2024; 1445:91-99. [PMID: 38967752 DOI: 10.1007/978-981-97-0511-5_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/06/2024]
Abstract
Liver is the largest internal organ of the body with vital functions. In addition to its endocrine and exocrine activities, liver also plays a pivotal role in the immune system, including haematopoietic functions. Liver parenchymal cells, which are epithelial cells, have been found to possess innate immune functions by expressing pattern-recognition receptors (PRRs), producing complement components, and secreting cytokines. Intriguingly, in recent years, it has been discovered that liver epithelial cells also produce immunoglobulins (Igs), which have long been thought to be produced exclusively by B cells. Notably, even liver epithelial cells from B lymphocyte-deficient mice, including SCID mice and μMT mice, could also produce Igs. Compelling evidence has revealed both the physiological and pathological functions of liver-derived Igs. For instance, liver epithelial cells-derived IgM can serve as a source of natural and specific antibodies that contribute to innate immune responses, while liver-produced IgG can act as a growth factor to promote cell proliferation and survival in normal hepatocytes and hepatocarcinoma. Similar to that in B cells, the toll-like receptor 9 (TLR9)-MyD88 signaling pathway is also actively involved in promoting liver epithelial cells to secrete IgM. Liver-derived Igs could potentially serve as biomarkers, prognostic indicators, and therapeutic targets in the clinical setting, particularly for liver cancers and liver injury. Nevertheless, despite significant advances, much remains unknown about the mechanisms governing Ig transcription in liver cells, as well as the detailed functions of liver-derived Igs and their involvement in diseases and adaptive immunity. Further studies are still needed to reveal these underlying, undefined issues related to the role of liver-derived Igs in both immunity and diseases.
Collapse
Affiliation(s)
- Fanlei Hu
- Department of Rheumatology and Immunology, Peking University People's Hospital and Beijing Key Laboratory for Rheumatism Mechanism and Immune Diagnosis, Beijing, China.
| | - Wenwei Shao
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China
| | - Xiaoyan Qiu
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing, China
| |
Collapse
|
5
|
Zheng J, Li G, Liu W, Deng Y, Xu X. The Expression of Non B Cell-Derived Immunoglobulins. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2024; 1445:11-36. [PMID: 38967747 DOI: 10.1007/978-981-97-0511-5_2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/06/2024]
Abstract
Although V(D)J recombination and immunoglobulin (Ig) production are traditionally recognised to occur only in B lymphocytes and plasma cells, the expression of Igs in non-lymphoid cells, which we call non B cell-derived Igs (non B Igs), has been documented by growing studies. It has been demonstrated that non B-Igs can be widely expressed in most cell types, including, but not limited to, epithelial cells, cardiomyocytes, hematopoietic stem/progenitor cells, myeloid cells, and cells from immune-privileged sites, such as neurons and spermatogenic cells. In particular, malignant tumour cells express high level of IgG. Moreover, different from B-Igs that mainly localised on the B cell membrane and in the serum and perform immune defence function mainly, non B-Igs have been found to distribute more widely and play critical roles in immune defence, maintaining cell proliferation and survival, and promoting progression. The findings of non B-Igs may provide a wealthier breakthrough point for more therapeutic strategies for a wide range of immune-related diseases.
Collapse
Affiliation(s)
- Jie Zheng
- Hematologic Disease Laboratory, Department of Stem Cell Transplantation, Beijing Children's Hospital, Capital Medical University, Beijing, China.
| | - Guohui Li
- Department of Pharmacology, College of Medicine, University of Arizona, Tucson, AZ, USA
| | - Wei Liu
- Department of Immunology, Hebei Medical University, Shijiazhuang, China
| | - Yuqing Deng
- Department of Immunology, Hebei Medical University, Shijiazhuang, China
| | - XiaoJun Xu
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing, China
| |
Collapse
|
6
|
Tang J, Gao E, Huang X, Liu Y, Shao W. Non B Cell-Derived Immunoglobulins in Lung Epithelial Cells and Lung Cancer. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2024; 1445:157-168. [PMID: 38967758 DOI: 10.1007/978-981-97-0511-5_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/06/2024]
Abstract
As the locus for air exchange, lung tissue is perpetually exposed to a significant quantity of foreign pathogens. Consequently, lung has developed a refined and intricate immune system. Beyond their physical and chemical barrier roles, lung epithelial cells can contribute to immune defence through the expression of Toll-like receptors (TLRs) and other pattern recognition receptors, along with the secretion of cytokines. Emerging evidence demonstrates that lung epithelial cells can generate and secrete immunoglobulins (Igs), including IgM, IgA, or IgG, thus performing antibody function. Moreover, malignantly transformed lung epithelial cells have been discovered to produce high levels of Ig, predominantly IgG, which do not fulfill the role of antibodies, but instead carries out tumour-promoting activity. Structural analysis has indicated that the biological activity of IgG produced by lung cancer cells differs from that of Igs produced by normal lung epithelial cells due to the unique glycosylation modification. Specifically, the sialylated IgG (SIA-IgG), characterised by a non-traditional N-glycosylation modification at the Asn162 site of Igγ CH1, is highly expressed in tumour stem cells. It has been demonstrated that SIA-IgG relies on this unique sialylation modification to promote tumorigenesis, metastasis, and immune evasion. Current results have proven that the Ig produced by lung epithelial cells has multifaceted biological activities, including immune defence functions under physiological conditions, while acquiring tumour-promoting activity during malignant transformation. These insights possess potential for the diagnosis and treatment of lung cancer as novel biomarkers and targets.
Collapse
Affiliation(s)
- Jingshu Tang
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China.
| | - Erya Gao
- People's Medical Publishing House Co., Ltd, Beijing, China
| | - Xinmei Huang
- Department of Respiratory and Critical Care Medicine, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, China
| | - Yang Liu
- Neuro-Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD, USA
| | - Wenwei Shao
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China
| |
Collapse
|
7
|
Frey A, Lunding LP, Wegmann M. The Dual Role of the Airway Epithelium in Asthma: Active Barrier and Regulator of Inflammation. Cells 2023; 12:2208. [PMID: 37759430 PMCID: PMC10526792 DOI: 10.3390/cells12182208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 09/01/2023] [Accepted: 09/03/2023] [Indexed: 09/29/2023] Open
Abstract
Chronic airway inflammation is the cornerstone on which bronchial asthma arises, and in turn, chronic inflammation arises from a complex interplay between environmental factors such as allergens and pathogens and immune cells as well as structural cells constituting the airway mucosa. Airway epithelial cells (AECs) are at the center of these processes. On the one hand, they represent the borderline separating the body from its environment in order to keep inner homeostasis. The airway epithelium forms a multi-tiered, self-cleaning barrier that involves an unstirred, discontinuous mucous layer, the dense and rigid mesh of the glycocalyx, and the cellular layer itself, consisting of multiple, densely interconnected cell types. On the other hand, the airway epithelium represents an immunologically highly active tissue once its barrier has been penetrated: AECs play a pivotal role in releasing protective immunoglobulin A. They express a broad spectrum of pattern recognition receptors, enabling them to react to environmental stressors that overcome the mucosal barrier. By releasing alarmins-proinflammatory and regulatory cytokines-AECs play an active role in the formation, strategic orientation, and control of the subsequent defense reaction. Consequently, the airway epithelium is of vital importance to chronic inflammatory diseases, such as asthma.
Collapse
Affiliation(s)
- Andreas Frey
- Division of Mucosal Immunology and Diagnostics, Research Center Borstel, 23845 Borstel, Germany;
- Airway Research Center North (ARCN), German Center for Lung Research (DZL), 22927 Großhansdorf, Germany;
| | - Lars P. Lunding
- Airway Research Center North (ARCN), German Center for Lung Research (DZL), 22927 Großhansdorf, Germany;
- Division of Lung Immunology, Research Center Borstel, 23845 Borstel, Germany
| | - Michael Wegmann
- Airway Research Center North (ARCN), German Center for Lung Research (DZL), 22927 Großhansdorf, Germany;
- Division of Lung Immunology, Research Center Borstel, 23845 Borstel, Germany
| |
Collapse
|
8
|
Gong X, Yan H, Ma J, Zhu Z, Zhang S, Xu W, Huang J, Qiu X. Macrophage-Derived Immunoglobulin M Inhibits Inflammatory Responses via Modulating Endoplasmic Reticulum Stress. Cells 2021; 10:cells10112812. [PMID: 34831038 PMCID: PMC8616491 DOI: 10.3390/cells10112812] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 10/16/2021] [Accepted: 10/18/2021] [Indexed: 12/23/2022] Open
Abstract
Immunoglobulin (Ig), a characteristic marker of B cells, is a multifunctional evolutionary conserved antibody critical for maintaining tissue homeostasis and developing fully protective humoral responses to pathogens. Increasing evidence revealed that Ig is widely expressed in non-immune cells; moreover, Ig produced by different lineages cells plays different biological roles. Recently, it has been reported that monocytes or macrophages also express Ig. However, its function remains unclear. In this study, we further identified that Ig, especially Ig mu heavy chain (IgM), was mainly expressed in mice macrophages. We also analyzed the IgM repertoire characteristic in macrophages and found that the VHDJH rearrangements of macrophage-derived IgM showed a restricted and conservative VHDJH pattern, which differed from the diverse VHDJH rearrangement pattern of the B cell-expressed IgM in an individual. Functional investigation showed that IgM knockdown significantly promoted macrophage migration and FAK/Src-Akt axis activation. Furthermore, some inflammatory cytokines such as MCP1 and IL-6 increased after IgM knockdown under LPS stimulation. A mechanism study revealed that the IgM interacted with binding immunoglobulin protein (Bip) and inhibited inflammatory response and unfolded protein response (UPR) activation in macrophages. Our data elucidate a previously unknown function of IgM in macrophages that explains its ability to act as a novel regulator of Bip to participate in endoplasmic reticulum stress and further regulate the inflammatory response.
Collapse
Affiliation(s)
- Xiaoting Gong
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing 100191, China; (X.G.); (H.Y.); (J.M.); (Z.Z.); (S.Z.); (W.X.)
- NHC Key Laboratory of Medical Immunology, Peking University, Beijing 100191, China
- Key Laboratory of Molecular Immunology, Chinese Academy of Medical Sciences, Beijing 100191, China
| | - Huige Yan
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing 100191, China; (X.G.); (H.Y.); (J.M.); (Z.Z.); (S.Z.); (W.X.)
- NHC Key Laboratory of Medical Immunology, Peking University, Beijing 100191, China
- Key Laboratory of Molecular Immunology, Chinese Academy of Medical Sciences, Beijing 100191, China
| | - Junfan Ma
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing 100191, China; (X.G.); (H.Y.); (J.M.); (Z.Z.); (S.Z.); (W.X.)
- NHC Key Laboratory of Medical Immunology, Peking University, Beijing 100191, China
- Key Laboratory of Molecular Immunology, Chinese Academy of Medical Sciences, Beijing 100191, China
| | - Zhu Zhu
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing 100191, China; (X.G.); (H.Y.); (J.M.); (Z.Z.); (S.Z.); (W.X.)
- NHC Key Laboratory of Medical Immunology, Peking University, Beijing 100191, China
- Key Laboratory of Molecular Immunology, Chinese Academy of Medical Sciences, Beijing 100191, China
| | - Shenghua Zhang
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing 100191, China; (X.G.); (H.Y.); (J.M.); (Z.Z.); (S.Z.); (W.X.)
- NHC Key Laboratory of Medical Immunology, Peking University, Beijing 100191, China
- Key Laboratory of Molecular Immunology, Chinese Academy of Medical Sciences, Beijing 100191, China
| | - Weiyan Xu
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing 100191, China; (X.G.); (H.Y.); (J.M.); (Z.Z.); (S.Z.); (W.X.)
- NHC Key Laboratory of Medical Immunology, Peking University, Beijing 100191, China
- Key Laboratory of Molecular Immunology, Chinese Academy of Medical Sciences, Beijing 100191, China
| | - Jing Huang
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing 100191, China; (X.G.); (H.Y.); (J.M.); (Z.Z.); (S.Z.); (W.X.)
- NHC Key Laboratory of Medical Immunology, Peking University, Beijing 100191, China
- Key Laboratory of Molecular Immunology, Chinese Academy of Medical Sciences, Beijing 100191, China
- Correspondence: (J.H.); (X.Q.); Tel.: +86-108-280-2846 (J.H.); +86-108-280-5477 (X.Q.)
| | - Xiaoyan Qiu
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing 100191, China; (X.G.); (H.Y.); (J.M.); (Z.Z.); (S.Z.); (W.X.)
- NHC Key Laboratory of Medical Immunology, Peking University, Beijing 100191, China
- Key Laboratory of Molecular Immunology, Chinese Academy of Medical Sciences, Beijing 100191, China
- Correspondence: (J.H.); (X.Q.); Tel.: +86-108-280-2846 (J.H.); +86-108-280-5477 (X.Q.)
| |
Collapse
|
9
|
Arend P. Why blood group A individuals are at risk whereas blood group O individuals are protected from SARS-CoV-2 (COVID-19) infection: A hypothesis regarding how the virus invades the human body via ABO(H) blood group-determining carbohydrates. Immunobiology 2021; 226:152027. [PMID: 33706067 PMCID: PMC7609233 DOI: 10.1016/j.imbio.2020.152027] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 08/16/2020] [Accepted: 10/18/2020] [Indexed: 12/31/2022]
Abstract
While the angiotensin converting enzyme 2 (ACE2) protein is defined as the primary severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) receptor, the viral serine molecule might be mobilized by the host's transmembrane protease serine subtype 2 (TMPRSS2) enzyme from the viral spike (S) protein and hijack the host's N-acetyl-D-galactosamine (GalNAc) metabolism. The resulting hybrid, serologically A-like/Tn (T nouvelle) structure potentially acts as a host-pathogen functional molecular bridge. In humans, this intermediate structure will hypothetically be replaced by ABO(H) blood group-specific, mucin-type structures, in the case of infection hybrid epitopes, implicating the phenotypically glycosidic accommodation of plasma proteins. The virus may, by mimicking the synthetic pathways of the ABO(H) blood groups, bind to the cell surfaces of the blood group O(H) by formation of a hybrid H-type antigen as the potential precursor of hybrid non-O blood groups, which does not affect the highly anti-glycan aggressive anti-A and anti-B isoagglutinin activities, exerted by the germline-encoded nonimmune immunoglobulin M (IgM). In the non-O blood groups, which have developed from the H-type antigen, these IgM activities are downregulated by phenotypic glycosylation, while adaptive immunoglobulins might arise in response to the hybrid A and B blood group structures, bonds between autologous carbohydrates and foreign peptides, suggesting the exertion of autoreactivity. The non-O blood groups thus become a preferred target for the virus, whereas blood group O(H) individuals, lacking the A/B phenotype-determining enzymes and binding the virus alone by hybrid H-type antigen formation, have the least molecular contact with the virus and maintain the critical anti-A and anti-B isoagglutinin activities, exerted by the ancestral IgM, which is considered the humoral spearhead of innate immunity.
Collapse
Affiliation(s)
- Peter Arend
- Philipps University Marburg, Department of Medicine, D-355 Marburg, Lahn, Germany(2); Gastroenterology Research Laboratory, University of Iowa, Carver College of Medicine, Iowa City, IA 52242, USA(2); Research Laboratories, Chemie Grünenthal GmbH, D-52062 Aachen, Germany(2).
| |
Collapse
|
10
|
Single-Cell Sequencing Confirms Transcripts and V HDJ H Rearrangements of Immunoglobulin Genes in Human Podocytes. Genes (Basel) 2021; 12:genes12040472. [PMID: 33806147 PMCID: PMC8064494 DOI: 10.3390/genes12040472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 03/18/2021] [Accepted: 03/24/2021] [Indexed: 11/17/2022] Open
Abstract
Most glomerular diseases are associated with inflammation caused by deposited pathogenic immunoglobulins (Igs), which are believed to be produced by B cells. However, our previous study indicated that the human podocyte cell line can produce IgG. In this study, we aimed to confirm the transcripts and characterize the repertoires of Igs in primary podocytes at single cell level. First, single-cell RNA sequencing of cell suspensions from “normal” kidney cortexes by a 10xGenomics Chromium system detected Ig transcripts in 7/360 podocytes and Ig gene segments in 106/360 podocytes. Then, we combined nested PCR with Sanger sequencing to detect the transcripts and characterize the repertoires of Igs in 48 single podocytes and found that five classes of Ig heavy chains were amplified in podocytes. Four-hundred and twenty-nine VHDJH rearrangement sequences were analyzed; podocyte-derived Igs exhibited classic VHDJH rearrangements with nucleotide additions and somatic hypermutations, biased VH1 usage and restricted diversity. Moreover, compared with the podocytes from healthy control that usually expressed one class of Ig and one VHDJH pattern, podocytes from patients expressed more classes of Ig, VHDJH patterns and somatic hypermutations. These findings suggested that podocytes can express Igs in normal condition and increase diversity in pathological situations.
Collapse
|
11
|
NBIGV-DB: A dedicated database of non-B cell derived immunoglobulin variable region. Gene 2020; 772:145378. [PMID: 33359127 DOI: 10.1016/j.gene.2020.145378] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 12/02/2020] [Accepted: 12/15/2020] [Indexed: 11/22/2022]
Abstract
Immunoglobulins (Ig) are important immune molecules that possess highly diverse variable region sequences enabling antigen recognition. According to classical immune theory, B lymphocytes have been considered the only source of Ig production (B-Igs). However, accumulating evidence have suggested that Igs are also produced by many non-B cells (non-B Igs), including epithelial cells, neurons, germ cells, as well as myeloid cells of hemopoietic system. Besides acting as bona fide antibodies, Non-B Igs have alternative cellular functions, such as promotion of cell survival, adhesion and migration. More importantly, Unlike the unlimited sequence diversity of B-Igs, the non-B Igs exhibit conserved V(D)J patterns across the same lineages. To support the analysis and comparison of variable region sequences from Igs, produced by B and non-B cells, we established a database (NBIGV) constituted by a non-B Ig variable region repertoire, which includes 727,989 VHDJH and VκJκ recombination sequences of non-B Igs sequenced from mouse samples. Upon database search, users can view, browse and investigate the variable region sequences of non-B Igs according to respective mice strains and tissues as well as Ig classes. Moreover, users can easily download selected sequences and/or compare sequences of interest with known non-B Ig sequences present in the database using NCBI-BLAST algorithms. Additionally, our database integrates a submission page and supplementary sample information. The NBIGV database may serve as a valuable resource for sequence analyses of Non-B Igs. NBIGV database is freely available at http://nbigv.org.
Collapse
|
12
|
Yin S, Shi Q, Shao W, Zhang C, Zhang Y, Qiu X, Huang J. Hepatocyte-Derived Igκ Exerts a Protective Effect against ConA-Induced Acute Liver Injury. Int J Mol Sci 2020; 21:ijms21249379. [PMID: 33317072 PMCID: PMC7763521 DOI: 10.3390/ijms21249379] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 12/02/2020] [Accepted: 12/07/2020] [Indexed: 12/02/2022] Open
Abstract
Immunoglobulin (Igκ) has been reported to be expressed in sorted liver epithelial cells of μMT mice, and the sequence characteristics of hepatocyte-derived Igκ were different from those of classical B-cell-derived Igκ. However, the physiological function of hepatocyte-derived Igκ is still unclear. The expression of Igκ was firstly identified in primary hepatocytes and normal liver cell line (NCTC1469), and hepatocyte-derived Igκ expression was elevated and displayed unique localization in hepatocytes of concanavalin A (ConA)-induced hepatitis model. Moreover, Igκ knockout mice were more sensitive to ConA-induced hepatitis and had higher serum aspartate aminotransferase (AST) levels, more severe histological injury and a greater number of terminal deoxynucleotide transferase-mediated deoxyuridine triphosphate nick end-labeling (TUNEL)-positive cells as compared with littermate controls. Furthermore, knockdown of Igκ in primary hepatocytes and NCTC1469 cells led to accelerated activation of the mitochondrial death pathway and caspase-3 cleavage in vitro, which might be related to inhibition of NF-κB signaling pathway and activation of JNK via the cytoskeleton dynamics. Taken together, these results indicate that hepatocyte-derived Igκ mediates cellular resistance to ConA-induced liver injury by inhibiting activation of caspase-3 and the mitochondrial death pathway, suggesting that Igκ plays an important role in hepatocyte survival and exerts a protective effect against ConA-induced liver injury in mice.
Collapse
Affiliation(s)
- Sha Yin
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing 100191, China; (S.Y.); (Q.S.); (W.S.); (C.Z.); (Y.Z.)
- NHC Key Laboratory of Medical Immunology, Peking University, Beijing 100191, China
| | - Qianwen Shi
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing 100191, China; (S.Y.); (Q.S.); (W.S.); (C.Z.); (Y.Z.)
- NHC Key Laboratory of Medical Immunology, Peking University, Beijing 100191, China
| | - Wenwei Shao
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing 100191, China; (S.Y.); (Q.S.); (W.S.); (C.Z.); (Y.Z.)
- NHC Key Laboratory of Medical Immunology, Peking University, Beijing 100191, China
| | - Chi Zhang
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing 100191, China; (S.Y.); (Q.S.); (W.S.); (C.Z.); (Y.Z.)
- NHC Key Laboratory of Medical Immunology, Peking University, Beijing 100191, China
| | - Yixiao Zhang
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing 100191, China; (S.Y.); (Q.S.); (W.S.); (C.Z.); (Y.Z.)
- NHC Key Laboratory of Medical Immunology, Peking University, Beijing 100191, China
| | - Xiaoyan Qiu
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing 100191, China; (S.Y.); (Q.S.); (W.S.); (C.Z.); (Y.Z.)
- NHC Key Laboratory of Medical Immunology, Peking University, Beijing 100191, China
- Correspondence: (X.Q.); (J.H.); Tel.: +86-10-82805744 (X.Q.); +86-10-82802846 (J.H.)
| | - Jing Huang
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing 100191, China; (S.Y.); (Q.S.); (W.S.); (C.Z.); (Y.Z.)
- NHC Key Laboratory of Medical Immunology, Peking University, Beijing 100191, China
- Correspondence: (X.Q.); (J.H.); Tel.: +86-10-82805744 (X.Q.); +86-10-82802846 (J.H.)
| |
Collapse
|
13
|
Deng Z, Wang X, Liu Y, Tian X, Deng S, Sun Y, Wang S, Zheng D, Cui Z, Pan Y, A L, Yan H, Qiu X, Wang Y. Single-cell RNA sequencing confirms IgG transcription and limited diversity of V HDJ H rearrangements in proximal tubular epithelial cells. Sci Rep 2020; 10:19657. [PMID: 33184300 PMCID: PMC7661700 DOI: 10.1038/s41598-020-75013-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 09/29/2020] [Indexed: 01/19/2023] Open
Abstract
Increasing evidence has confirmed that immunoglobulins (Igs) can be expressed in non-B cells. Our previous work demonstrated that mesangial cells and podocytes express IgA and IgG, respectively. The aim of this work was to reveal whether proximal tubular epithelial cells (PTECs) express Igs. High-throughput single-cell RNA sequencing (scRNA-seq) detected Igs in a small number of PTECs, and then we combined nested PCR with Sanger sequencing to detect the transcripts and characterize the repertoires of Igs in PTECs. We sorted PTECs from the normal renal cortex of two patients with renal cancer by FACS and further confirmed their identify by LRP2 gene expression. Only the transcripts of the IgG heavy chain were successfully amplified in 91/111 single PTECs. We cloned and sequenced 469 VHDJH transcripts from 91 single PTECs and found that PTEC-derived IgG exhibited classic VHDJH rearrangements with nucleotide additions at the junctions and somatic hypermutations. Compared with B cell-derived IgG, PTEC-derived IgG displayed less diversity of VHDJH rearrangements, predominant VH1-24/DH2-15/JH4 sequences, biased VH1 usage, centralized VH gene segment location at the 3′ end of the genome and non-Gaussian distribution of the CDR3 length. These results demonstrate that PTECs can express a distinct IgG repertoire that may have implications for their role in the renal tubular epithelial-mesenchymal transition.
Collapse
Affiliation(s)
- Zhenling Deng
- Department of Nephrology, Peking University Third Hospital, 49 Huayuanbei Road, Beijing, 100191, People's Republic of China
| | - Xinyao Wang
- Department of Nephrology, Peking University Third Hospital, 49 Huayuanbei Road, Beijing, 100191, People's Republic of China
| | - Yue Liu
- Department of Nephrology, Peking University Third Hospital, 49 Huayuanbei Road, Beijing, 100191, People's Republic of China
| | - Xinyu Tian
- Department of Nephrology, Peking University Third Hospital, 49 Huayuanbei Road, Beijing, 100191, People's Republic of China
| | - Shaohui Deng
- Department of Nephrology, Peking University Third Hospital, 49 Huayuanbei Road, Beijing, 100191, People's Republic of China
| | - Yingchun Sun
- Department of Nephrology, Peking University Third Hospital, 49 Huayuanbei Road, Beijing, 100191, People's Republic of China
| | - Song Wang
- Department of Nephrology, Peking University Third Hospital, 49 Huayuanbei Road, Beijing, 100191, People's Republic of China
| | - Danxia Zheng
- Department of Nephrology, Peking University Third Hospital, 49 Huayuanbei Road, Beijing, 100191, People's Republic of China
| | - Zhuan Cui
- Department of Nephrology, Peking University Third Hospital, 49 Huayuanbei Road, Beijing, 100191, People's Republic of China
| | - Yuejuan Pan
- Department of Nephrology, Peking University Third Hospital, 49 Huayuanbei Road, Beijing, 100191, People's Republic of China
| | - Lata A
- Department of Nephrology, Peking University Third Hospital, 49 Huayuanbei Road, Beijing, 100191, People's Republic of China
| | - Huige Yan
- Department of Immunology, School of Basic Medical Sciences, Peking University, 38 Xueyuan Road, Beijing, 100191, People's Republic of China
| | - Xiaoyan Qiu
- Department of Immunology, School of Basic Medical Sciences, Peking University, 38 Xueyuan Road, Beijing, 100191, People's Republic of China.
| | - Yue Wang
- Department of Nephrology, Peking University Third Hospital, 49 Huayuanbei Road, Beijing, 100191, People's Republic of China.
| |
Collapse
|
14
|
Michaud E, Mastrandrea C, Rochereau N, Paul S. Human Secretory IgM: An Elusive Player in Mucosal Immunity. Trends Immunol 2020; 41:141-156. [PMID: 31928913 DOI: 10.1016/j.it.2019.12.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2019] [Revised: 12/06/2019] [Accepted: 12/10/2019] [Indexed: 12/29/2022]
Abstract
Secretory IgMs (SIgMs) were amongst the first identified immunoglobulins. However, their importance was not fully understood and recent advances have shown they play a key role in establishing and promoting commensal gut tolerance in mice and humans. The true interactions between SIgMs and the microbiota remain controversial and we aim to consolidate current knowledge in this review. Through comprehensive examination of SIgMs and their corresponding B cell secretors in several different pathological immunological contexts, we review the presumed role of these molecules in gut tolerance, inflammatory bowel diseases, and lung immunity. As SIgMs harbor a mostly tolerogenic function, we posit that their inclusion in further immunological research is paramount.
Collapse
Affiliation(s)
- Eva Michaud
- GIMAP/EA3064, Université de Lyon, CIC 1408 Vaccinology, Saint-Etienne, France
| | | | - Nicolas Rochereau
- GIMAP/EA3064, Université de Lyon, CIC 1408 Vaccinology, Saint-Etienne, France
| | - Stéphane Paul
- GIMAP/EA3064, Université de Lyon, CIC 1408 Vaccinology, Saint-Etienne, France.
| |
Collapse
|
15
|
Geng ZH, Ye CX, Huang Y, Jiang HP, Ye YJ, Wang S, Zhou Y, Shen ZL, Qiu XY. Human colorectal cancer cells frequently express IgG and display unique Ig repertoire. World J Gastrointest Oncol 2019; 11:195-207. [PMID: 30918593 PMCID: PMC6425329 DOI: 10.4251/wjgo.v11.i3.195] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 01/03/2019] [Accepted: 01/09/2019] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND There is growing evidence proving that many human carcinomas, including colon cancer, can overexpress immunoglobulin (Ig); the non B cancer cell-derived Ig usually displayed unique V(D)J rearrangement pattern that are distinct from B cell-derived Ig. Especially, the cancer-derived Ig plays important roles in cancer initiation, progression, and metastasis. However, it still remains unclear if the colon cancer-derived Ig can display unique V(D)J pattern and sequencing, which can be used as novel target for colon cancer therapy.
AIM To investigate the Ig repertoire features expressed in human colon cancer cells.
METHODS Seven cancerous tissue samples of colon adenocarcinoma and corresponding noncancerous tissue samples were sorted by fluorescence-activated cell sorting using epithelial cell adhesion molecule as a marker for epithelial cells. Ig repertoire sequencing was used to analyze the expression profiles of all 5 classes of Ig heavy chains (IgH) and the Ig repertoire in colon cancer cells and corresponding normal epithelial cells.
RESULTS We found that all 5 IgH classes can be expressed in both colon cancer cells and normal epithelial cells. Surprisingly, unlike the normal colonic epithelial cells that expressed 5 Ig classes, our results suggested that cancer cells most prominently express IgG. Next, we found that the usage of Ig in cancer cells caused the expression of some unique Ig repertoires compared to normal cells. Some VH segments, such as VH3-7, have been used in cancer cells, and VH3-74 was frequently present in normal epithelial cells. Moreover, compared to the normal cell-derived Ig, most cancer cell-derived Ig showed unique VHDJH patterns. Importantly, even if the same VHDJH pattern was seen in cancer cells and normal cells, cancer cell-derived IgH always displayed distinct hypermutation hot points.
CONCLUSION We found that colon cancer cells could frequently express IgG and unique IgH repertoires, which may be involved in carcinogenesis of colon cancer. The unique IgH repertoire has the potential to be used as a novel target in immune therapy for colon cancer.
Collapse
Affiliation(s)
- Zi-Han Geng
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing 100191, China
- NHC Key Laboratory of Medical Immunology (Peking University), Beijing 100191, China
- Key Laboratory of Molecular Immunology, Chinese Academy of Medical Sciences, Beijing 100191, China
| | - Chun-Xiang Ye
- Department of Gastrointestinal Surgery, Peking University People's Hospital, Beijing 100044, China
- Key Laboratory of Colorectal Cancer Diagnosis and Treatment Research, Beijing 100044, China
| | - Yan Huang
- Institute of Computational Medicine, School of Artificial Intelligence, Hebei University of Technology, Tianjin 300401, China
| | - Hong-Peng Jiang
- Department of Gastrointestinal Surgery, Peking University People's Hospital, Beijing 100044, China
- Key Laboratory of Colorectal Cancer Diagnosis and Treatment Research, Beijing 100044, China
| | - Ying-Jiang Ye
- Department of Gastrointestinal Surgery, Peking University People's Hospital, Beijing 100044, China
- Key Laboratory of Colorectal Cancer Diagnosis and Treatment Research, Beijing 100044, China
| | - Shan Wang
- Department of Gastrointestinal Surgery, Peking University People's Hospital, Beijing 100044, China
- Key Laboratory of Colorectal Cancer Diagnosis and Treatment Research, Beijing 100044, China
| | - Yuan Zhou
- Department of Biomedical Informatics, School of Basic Medical Sciences, Center for Noncoding RNA Medicine, Peking University, Beijing 100191, China
| | - Zhan-Long Shen
- Department of Gastrointestinal Surgery, Peking University People's Hospital, Beijing 100044, China
- Key Laboratory of Colorectal Cancer Diagnosis and Treatment Research, Beijing 100044, China
| | - Xiao-Yan Qiu
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing 100191, China
- NHC Key Laboratory of Medical Immunology (Peking University), Beijing 100191, China
- Key Laboratory of Molecular Immunology, Chinese Academy of Medical Sciences, Beijing 100191, China
| |
Collapse
|
16
|
Zhai Q, Xiao Y, Li P, Tian F, Zhao J, Zhang H, Chen W. Varied doses and chemical forms of selenium supplementation differentially affect mouse intestinal physiology. Food Funct 2019; 10:5398-5412. [DOI: 10.1039/c9fo00278b] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Varied doses and chemical forms of selenium supplementation differentially affect mouse intestinal physiology and perturbed the fecal metabolic profiles of and jejunal protein expression in mice.
Collapse
Affiliation(s)
- Qixiao Zhai
- State Key Laboratory of Food Science and Technology
- Jiangnan University
- Wuxi
- P. R. China
- School of Food Science and Technology
| | - Yue Xiao
- State Key Laboratory of Food Science and Technology
- Jiangnan University
- Wuxi
- P. R. China
- School of Food Science and Technology
| | - Peng Li
- School of Food Science and Technology
- Jiangnan University
- Wuxi
- P. R. China
- National Engineering Research Center for Functional Food
| | - Fengwei Tian
- State Key Laboratory of Food Science and Technology
- Jiangnan University
- Wuxi
- P. R. China
- School of Food Science and Technology
| | - Jianxin Zhao
- State Key Laboratory of Food Science and Technology
- Jiangnan University
- Wuxi
- P. R. China
- School of Food Science and Technology
| | - Hao Zhang
- State Key Laboratory of Food Science and Technology
- Jiangnan University
- Wuxi
- P. R. China
- School of Food Science and Technology
| | - Wei Chen
- State Key Laboratory of Food Science and Technology
- Jiangnan University
- Wuxi
- P. R. China
- School of Food Science and Technology
| |
Collapse
|
17
|
Abstract
In contrast to adaptive antibodies, natural antibodies are present in a non-immunised organism from birth, and they do not include anti-Gal antibodies and/or anti-Gal natural antibodies, which are developed as a result of the effect of the α-Gal epitope and physiological flora. Natural antibodies are the first line of the organism’s defence before the formation of the immunity created via the stimulation of elements that determine specific and non-specific immunity. This is especially important in the case of infants. Despite the fact that natural antibodies differ in their function from adaptive antibodies, they are polyreactive and they detect autoantigens and new antigenic determinants. Natural antibodies are formed from the subpopulation of B lymphocytes, mainly B1 lymphocytes and B lymphocytes of the marginal zone. This phenomenon is supported by the fact that when the quantity of these cells in the organism decreases, which happens with age, the level of natural antibodies also decreases and the risk of illnesses of old age becomes higher. During ontogenesis, these antibodies participate in many physiological processes, including the “support” of the immune system and homeostasis, the prevention of inflammation, infections and other pathological states, such as autoimmune and cardiovascular diseases, or the process of carcinogenesis. The best known natural antibody is IgM, but the role of IgGs and IgAs is also considered important. Nowadays, many researchers also mention intravenous immunoglobulins, which are used in the treatment of numerous illnesses, and there are discussions on the possibility of increasing their potential if they were based on natural antibodies.
Collapse
|
18
|
Arend P. Early ovariectomy reveals the germline encoding of natural anti-A- and Tn-cross-reactive immunoglobulin M (IgM) arising from developmental O-GalNAc glycosylations. (Germline-encoded natural anti-A/Tn cross-reactive IgM). Cancer Med 2017; 6:1601-1613. [PMID: 28580709 PMCID: PMC5504323 DOI: 10.1002/cam4.1079] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Revised: 02/26/2017] [Accepted: 03/24/2017] [Indexed: 01/02/2023] Open
Abstract
While native blood group A-like glycans have not been demonstrated in prokaryotic microorganisms as a source of human "natural" anti-A isoagglutinin production, and metazoan eukaryotic N-acetylgalactosamine O-glycosylation of serine or threonine residues (O-GalNAc-Ser/Thr-R) does not occur in bacteria, the O-GalNAc glycan-bearing ovarian glycolipids, discovered in C57BL/10 mice, are complementary to the syngeneic anti-A-reactive immunoglobulin M (IgM), which is not present in animals that have undergone ovariectomy prior to the onset of puberty. These mammalian ovarian glycolipids are complementary also to the anti-A/Tn cross-reactive Helix pomatia agglutinin (HPA), a molluscan defense protein, emerging from the coat proteins of fertilized eggs and reflecting the snail-intrinsic, reversible O-GalNAc glycosylations. The hexameric structure of this primitive invertebrate defense protein gives rise to speculation regarding an evolutionary relationship to the mammalian nonimmune, anti-A-reactive immunoglobulin M (IgM) molecule. Hypothetically, this molecule obtains its complementarity from the first step of protein glycosylations, initiated by GalNAc via reversible O-linkages to peptides displaying Ser/Thr motifs, whereas the subsequent transferase depletion completes germ cell maturation and cell renewal, associated with loss of glycosidic bonds and release of O-glycan-depleted proteins, such as complementary IgM revealing the structure of the volatilely expressed "lost" glycan carrier through germline Ser residues. Consequently, the evolutionary/developmental first glycosylations of proteins appear metabolically related or identical to that of the mucin-type, potentially "aberrant" monosaccharide GalNAcα1-O-Ser/Thr-R, also referred to as the Tn (T "nouvelle") antigen, and explain the anti-Tn cross-reactivity of human innate or "natural" anti-A-specific isoagglutinin and the pronounced occurrence of cross-reactive anti-Tn antibody in plasma from humans with histo-blood group O. In fact, A-allelic, phenotype-specific GalNAc glycosylation of plasma proteins does not occur in human blood group O, affecting anti-Tn antibody levels, which may function as a growth regulator that contributes to a potential survival advantage of this group in the overall risk of developing cancer when compared with non-O blood groups.
Collapse
Affiliation(s)
- Peter Arend
- Philipps University MarburgDepartment of MedicineD‐355 Marburg/Lahn, Germany
- Gastroenterology Research LaboratoryUniversity of Iowa, College of MedicineIowa CityIowa
- Research LaboratoriesChemie Grünenthal GmbHD‐52062AachenGermany
| |
Collapse
|
19
|
Zhu Z, Zhang M, Shao W, Wang P, Gong X, Ma J, Qiu X, Wang B. Immunoglobulin M, a novel molecule of myocardial cells of mice. Int J Biochem Cell Biol 2017; 88:172-180. [PMID: 28392377 DOI: 10.1016/j.biocel.2017.04.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Revised: 03/16/2017] [Accepted: 04/05/2017] [Indexed: 01/21/2023]
Abstract
BACKGROUND Immunoglobulins(Igs)play an important role in host defence and were initially thought to be expressed solely by B cells. However, recent data suggest that Igs are also expressed in other lineages. Recently, Ig transcripts were detected in cardiomyocytes, but whether the functional Ig protein is expressed by cardiomyocytes has not been thoroughly elucidated. METHODS Gene Expression Omnibus (GEO) microarray database analysis was used to analyse IgM heavy chain expression in the myocardium of mice. Immunohistochemistry (IHC), ELISA and Western blot were used to identify IgM in cardiomyocytes of both Balb/c mice and μMT mice (B cell-deficient mice), as well as in cultured cardiomyocytes of neonatal mice and in the myocardial cell line HL-1. Moreover, RT-PCR and cDNA sequencing were used to determine the VDJ rearrangement of the IgM heavy chain. RESULTS In this study, we first analysed transcription of the IgM heavy chain in heart tissue in mice by mining the GEO database, and we observed that IgM heavy chain transcripts were expressed in heart tissues. Subsequently, IgM was found to be expressed in cardiomyocytes in mice; the IgM was primarily localized on the cell membranes and intercalated discs of murine heart cells and in the cytoplasm and cell membranes of isolated cardiomyocytes and HL-1. Importantly, the functional IgM heavy chain transcripts exhibit a unique VDJ rearrangement pattern. Furthermore, IgM can be secreted and deposited in the extracellular space of the myocardium under ischaemic/hypoxic conditions. CONCLUSIONS Our data indicate for the first time that IgM is expressed by cardiomyocytes in mice and suggest that its physiological function warrants further investigation.
Collapse
Affiliation(s)
- Zhu Zhu
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing, China
| | - Meng Zhang
- Department of Cardiology, Aerospace Clinical Medical College of Peking University, Beijing, China
| | - Wenwei Shao
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing, China
| | - Pingzhang Wang
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing, China
| | - Xiaoting Gong
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing, China
| | - Junfan Ma
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing, China
| | - Xiaoyan Qiu
- Department of Immunology, School of Basic Medical Sciences, Peking University, Beijing, China.
| | - Bin Wang
- Department of Cardiology, Aerospace Clinical Medical College of Peking University, Beijing, China.
| |
Collapse
|