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Zhang MM, Liang MJ, Zhang DM, Cai JN, Yang QJ, Yun-Zhao, Zhang JP, Li YL. The function and mechanism of LAPTM5 in diseases. Biomed Pharmacother 2024; 178:117237. [PMID: 39096616 DOI: 10.1016/j.biopha.2024.117237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2024] [Revised: 07/25/2024] [Accepted: 07/30/2024] [Indexed: 08/05/2024] Open
Abstract
The Lysosomal Protein Transmembrane 5 (LAPTM5) is a lysosomal transmembrane protein preferentially expressed in hematopoietic cells. The human LAPTM5 gene is located at position 1p34 and extends approximately 25 kb. Its protein includes five transmembrane domains, three PY motifs, and one UIM. The PY and UIM motifs can interact with various substrates, mediating sorting of proteins from Golgi to lysosome and subsequently participating in intracellular substrate transport and lysosomal stability regulation. Overexpression of LAPTM5 can induce lysosomal cell death (LCD), although the integrity of LAPTM5 protein is necessary for maintaining lysosome stability. Furthermore, LAPTM5 plays a role in autophagy activation during disease processes and has been confirmed to be closely associated with the regulation of immunity and inflammation. Therefore, LAPTM5 regulates a wide range of physiological processes and is involved in various diseases. This article summarizes the characteristics of the LAPTM5 gene and protein structure and provides a comprehensive review of the mechanisms involved in cell death, autophagy, immunity, and inflammation regulation. It emphasizes the significance of LAPTM5 in the clinical prevention and treatment of cardiovascular diseases, immune system disorders, viral infections, cancer, and other diseases, which could provide new therapeutic ideas and targets for human diseases.
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Affiliation(s)
- Man-Man Zhang
- Department of Pharmacy, Shanghai Sixth People's Hospital Affiliated Shanghai Jiao Tong University School of Medicine, Shanghai 200233, China
| | - Ming-Jun Liang
- Department of Critical Care Medicine, Shanghai Sixth People's Hospital Affiliated Shanghai Jiao Tong University School of Medicine, Shanghai 200233, China
| | - Dong-Mei Zhang
- Department of Pharmacy, Shanghai Sixth People's Hospital Affiliated Shanghai Jiao Tong University School of Medicine, Shanghai 200233, China
| | - Jun-Nan Cai
- Department of Pharmacy, Shanghai Sixth People's Hospital Affiliated Shanghai Jiao Tong University School of Medicine, Shanghai 200233, China
| | - Quan-Jun Yang
- Department of Pharmacy, Shanghai Sixth People's Hospital Affiliated Shanghai Jiao Tong University School of Medicine, Shanghai 200233, China
| | - Yun-Zhao
- Department of Pharmacy, Shanghai Sixth People's Hospital Affiliated Shanghai Jiao Tong University School of Medicine, Shanghai 200233, China
| | - Jian-Ping Zhang
- Department of Pharmacy, Shanghai Sixth People's Hospital Affiliated Shanghai Jiao Tong University School of Medicine, Shanghai 200233, China
| | - Yang-Ling Li
- Department of Clinical Pharmacology, Key Laboratory of Clinical Cancer Pharmacology and Toxicology Research of Zhejiang Province, Affiliated Hangzhou First People's Hospital, School of Medicine, Westlake University, Hangzhou 310006, China.
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2
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Ji Y, Kim H, Yang L, Sha H, Roman CA, Long Q, Qi L. The Sel1L-Hrd1 Endoplasmic Reticulum-Associated Degradation Complex Manages a Key Checkpoint in B Cell Development. Cell Rep 2016; 16:2630-2640. [PMID: 27568564 DOI: 10.1016/j.celrep.2016.08.003] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2016] [Revised: 07/06/2016] [Accepted: 07/31/2016] [Indexed: 01/09/2023] Open
Abstract
Endoplasmic reticulum (ER)-associated degradation (ERAD) is a principal mechanism that targets ER-associated proteins for cytosolic proteasomal degradation. Here, our data demonstrate a critical role for the Sel1L-Hrd1 complex, the most conserved branch of ERAD, in early B cell development. Loss of Sel1L-Hrd1 ERAD in B cell precursors leads to a severe developmental block at the transition from large to small pre-B cells. Mechanistically, we show that Sel1L-Hrd1 ERAD selectively recognizes and targets the pre-B cell receptor (pre-BCR) for proteasomal degradation in a BiP-dependent manner. The pre-BCR complex accumulates both intracellularly and at the cell surface in Sel1L-deficient pre-B cells, leading to persistent pre-BCR signaling and pre-B cell proliferation. This study thus implicates ERAD mediated by Sel1L-Hrd1 as a key regulator of B cell development and reveals the molecular mechanism underpinning the transient nature of pre-BCR signaling.
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Affiliation(s)
- Yewei Ji
- Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853, USA
| | - Hana Kim
- Graduate Field of Immunology and Infectious Disease, Cornell University, Ithaca, NY 14853, USA
| | - Liu Yang
- Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853, USA
| | - Haibo Sha
- Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853, USA
| | - Christopher A Roman
- Department of Cell Biology, College of Medicine and Program in Molecular and Cellular Biology, The School of Graduate Studies, State University of New York, Downstate Medical Center at Brooklyn, New York, NY 11203, USA
| | - Qiaoming Long
- Laboratory Animal Research Center, Medical College of Soochow University, Suzhou 215006, Jiangsu, China
| | - Ling Qi
- Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853, USA; Graduate Field of Immunology and Infectious Disease, Cornell University, Ithaca, NY 14853, USA.
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Zouali M. Transcriptional and metabolic pre-B cell receptor-mediated checkpoints: implications for autoimmune diseases. Mol Immunol 2014; 62:315-20. [PMID: 24602812 DOI: 10.1016/j.molimm.2014.01.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Revised: 01/10/2014] [Accepted: 01/13/2014] [Indexed: 02/01/2023]
Abstract
At the pre-B cell stage of lymphocyte development, immunoglobulin light-chains are not yet produced, and heavy-chains are covalently linked to surrogate light-chains composed of VpreB and λ5 to form the pre-B cell receptor (pre-BCR) in a non-covalent association with signal-transducing modules. Even tough the pre-BCR does not have the potential to bind conventional antigens, accumulating evidence indicates that pre-BCR-mediated checkpoints are important both for negative and positive selection of self-reactivity, and that defects in these regulatory nodes may be associated with autoimmune disease. Thus, the transcription factor BACH2, which represents a susceptibility locus for rheumatoid arthritis, has recently emerged as a crucial mediator of negative selection at a pre-BCR checkpoint. The lysosome-associated protein LAPTM5, which is highly expressed in an animal model of Sjögren's syndrome, plays a role in down-modulation of the pre-BCR. Studies of copy number variation in rheumatoid arthritis suggest that a reduced dosage of the VPREB1 gene is involved in disease pathogenesis. Notably, animal models of autoimmune disease exhibit defects in pre-B to naïve B cell checkpoints. Administration of a pre-BCR ligand, which also plays a role in anergy both in human and murine B lymphocytes, ameliorates disease in experimental models of autoimmunity. Further investigation is required to gain a better insight into the molecular mechanisms of pre-BCR-mediated checkpoints and to determine their relevance to autoimmune diseases.
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Affiliation(s)
- Moncef Zouali
- Inserm, UMR 1132, F-75475 Paris, France; Université Paris Diderot, Sorbone Paris Cité, F-75475 Paris, France.
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Hauser J, Verma-Gaur J, Grundström T. Broad feedback inhibition of pre-B-cell receptor signaling components. Mol Immunol 2013; 54:247-53. [DOI: 10.1016/j.molimm.2012.12.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 11/28/2012] [Accepted: 12/04/2012] [Indexed: 11/13/2022]
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A novel mechanism for the autonomous termination of pre-B cell receptor expression via induction of lysosome-associated protein transmembrane 5. Mol Cell Biol 2012; 32:4462-71. [PMID: 22949502 DOI: 10.1128/mcb.00531-12] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
The expression of the pre-B cell receptor (BCR) is confined to the early stage of B cell development, and its dysregulation is associated with anomalies of B-lineage cells, including leukemogenesis. Previous studies suggested that the pre-BCR signal might trigger the autonomous termination of pre-BCR expression even before the silencing of pre-BCR gene expression to prevent sustained pre-BCR expression. However, the underlying mechanism remains ill defined. Here we demonstrate that the pre-BCR signal induces the expression of lysosome-associated protein transmembrane 5 (LAPTM5), which leads to the prompt downmodulation of the pre-BCR. While LAPTM5 induction had no significant impact on the internalization of cell surface pre-BCR, it elicited the translocation of a large pool of intracellular pre-BCR from the endoplasmic reticulum to the lysosomal compartment concomitantly with a drastic reduction of the level of intracellular pre-BCR proteins. This reduction was inhibited by lysosomal inhibitors, indicating the lysosomal degradation of the pre-BCR. Notably, the LAPTM5 deficiency in pre-B cells led to the augmented expression level of surface pre-BCR. Collectively, the pre-BCR induces the prompt downmodulation of its own expression through the induction of LAPTM5, which promotes the lysosomal transport and degradation of the intracellular pre-BCR pool and, hence, limits the supply of pre-BCR to the cell surface.
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Herzog S, Jumaa H. Self-recognition and clonal selection: autoreactivity drives the generation of B cells. Curr Opin Immunol 2012; 24:166-72. [PMID: 22398125 DOI: 10.1016/j.coi.2012.02.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2011] [Revised: 01/19/2012] [Accepted: 02/06/2012] [Indexed: 11/15/2022]
Abstract
The diversity of B cell receptor (BCR) specificities is generated by VDJ recombination of gene segments during early B cell development, a process which bears the risk of producing BCRs that recognize and lead to the destruction of self-structures. Traditional thoughts have mainly focused on how such putatively dangerous specificities are dealt with and in how they contribute to the development of autoimmune diseases. However, a positive or even necessary role of self-recognition during B cell development has rarely been taken into account. Now, considerable data reveal that the pre-B cell receptor (pre-BCR), which marks an important checkpoint during B cell development, acts as a surrogate autoreactive receptor. This review outlines how autoreactivity is necessary for efficient B cell development and how autoreactive receptors drive positive selection, leading to a diverse repertoire of receptor specificities in the mature B cell pool.
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Affiliation(s)
- Sebastian Herzog
- BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany
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The pre-B cell receptor: turning autoreactivity into self-defense. Trends Immunol 2010; 31:176-83. [DOI: 10.1016/j.it.2010.02.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2009] [Revised: 02/03/2010] [Accepted: 02/25/2010] [Indexed: 11/17/2022]
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Karnowski A, Cao C, Matthias G, Carotta S, Corcoran LM, Martensson IL, Skok JA, Matthias P. Silencing and nuclear repositioning of the lambda5 gene locus at the pre-B cell stage requires Aiolos and OBF-1. PLoS One 2008; 3:e3568. [PMID: 18974788 PMCID: PMC2571989 DOI: 10.1371/journal.pone.0003568] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2008] [Accepted: 09/15/2008] [Indexed: 12/30/2022] Open
Abstract
The chromatin regulator Aiolos and the transcriptional coactivator OBF-1 have been implicated in regulating aspects of B cell maturation and activation. Mice lacking either of these factors have a largely normal early B cell development. However, when both factors are eliminated simultaneously a block is uncovered at the transition between pre-B and immature B cells, indicating that these proteins exert a critical function in developing B lymphocytes. In mice deficient for Aiolos and OBF-1, the numbers of immature B cells are reduced, small pre-BII cells are increased and a significant impairment in immunoglobulin light chain DNA rearrangement is observed. We identified genes whose expression is deregulated in the pre-B cell compartment of these mice. In particular, we found that components of the pre-BCR, such as the surrogate light chain genes λ5 and VpreB, fail to be efficiently silenced in double-mutant mice. Strikingly, developmentally regulated nuclear repositioning of the λ5 gene is impaired in pre-B cells lacking OBF-1 and Aiolos. These studies uncover a novel role for OBF-1 and Aiolos in controlling the transcription and nuclear organization of genes involved in pre-BCR function.
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Affiliation(s)
- Alexander Karnowski
- Friedrich Miescher Institute for Biomedical Research, Novartis Research Foundation, Basel, Switzerland
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia
| | - Chun Cao
- Friedrich Miescher Institute for Biomedical Research, Novartis Research Foundation, Basel, Switzerland
| | - Gabriele Matthias
- Friedrich Miescher Institute for Biomedical Research, Novartis Research Foundation, Basel, Switzerland
| | - Sebastian Carotta
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia
| | - Lynn M. Corcoran
- The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia
| | - Inga-Lill Martensson
- Laboratory of Lymphocyte Signaling and Development, The Babraham Institute, Cambridge, United Kingdom
| | - Jane A. Skok
- Department of Immunology and Molecular Pathology, University College London, London, United Kingdom
- New York University School of Medicine, New York, New York, United States of America
| | - Patrick Matthias
- Friedrich Miescher Institute for Biomedical Research, Novartis Research Foundation, Basel, Switzerland
- * E-mail:
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Vettermann C, Herrmann K, Albert C, Roth E, Bösl MR, Jäck HM. A unique role for the lambda5 nonimmunoglobulin tail in early B lymphocyte development. THE JOURNAL OF IMMUNOLOGY 2008; 181:3232-42. [PMID: 18713994 DOI: 10.4049/jimmunol.181.5.3232] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Precursor BCR (pre-BCR) signaling governs proliferation and differentiation of pre-B cells during B lymphocyte development. However, it is controversial as to which parts of the pre-BCR, which is composed of Igmu H chain, surrogate L chain (SLC), and Igalpha-Igbeta, are important for signal initiation. Here, we show in transgenic mice that the N-terminal non-Ig-like (unique) tail of the surrogate L chain component lambda5 is critical for enhancing pre-BCR-induced proliferation signals. Pre-BCRs with a mutated lambda5 unique tail are still transported to the cell surface, but they deliver only basal signals that trigger survival and differentiation of pre-B cells. Further, we demonstrate that the positively charged residues of the lambda5 unique tail, which are required for pre-BCR self-oligomerization, can also mediate binding to stroma cell-associated self-Ags, such as heparan sulfate. These findings establish the lambda5 unique tail as a pre-BCR-specific autoreactive signaling motif that could increase the size of the primary Ab repertoire by selectively expanding pre-B cells with functional Igmu H chains.
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Affiliation(s)
- Christian Vettermann
- Division of Molecular Immunology, Department of Internal Medicine III, Nikolaus-Fiebiger-Center for Molecular Medicine, University of Erlangen, Erlangen, Germany
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