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Swaroop AK, Negi P, Kar A, Mariappan E, Natarajan J, Namboori P K K, Selvaraj J. Navigating IL-6: From molecular mechanisms to therapeutic breakthroughs. Cytokine Growth Factor Rev 2024; 76:48-76. [PMID: 38220583 DOI: 10.1016/j.cytogfr.2023.12.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Accepted: 12/28/2023] [Indexed: 01/16/2024]
Abstract
This concise review navigates the intricate realm of Interleukin-6 (IL-6), an important member of the cytokine family. Beginning with an introduction to cytokines, this narrative review unfolds with the historical journey of IL-6, illuminating its evolving significance. A crucial section unravels the three distinct signaling modes employed by IL-6, providing a foundational understanding of its versatile interactions within cellular landscapes. Moving deeper, the review meticulously dissects IL-6's signaling mechanisms, unraveling the complexities of its pleiotropic effects in both physiological responses and pathological conditions. A significant focus is dedicated to the essential role IL-6 plays in inflammatory diseases, offering insights into its associations and implications for various health conditions. The review also takes a therapeutic turn by exploring the emergence of anti-IL-6 monoclonal inhibitors, marking a profound stride in treatment modalities. Diving into the molecular realm, the review explores small molecules as agents for IL-6 inhibition, providing a nuanced perspective on diverse intervention strategies. As the review embarks on the final chapters, it contemplates future aspects, offering glimpses into potential research trajectories and the evolving landscape of IL-6-related studies.
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Affiliation(s)
- Akey Krishna Swaroop
- Department of Pharmaceutical Chemistry, JSS College of Pharmacy, JSS Academy of Higher Education and Research, Ooty, Tamil Nadu, India
| | - Preeya Negi
- Department of Pharmaceutical Chemistry, JSS College of Pharmacy, JSS Academy of Higher Education and Research, Ooty, Tamil Nadu, India
| | - Ayushi Kar
- Department of Pharmaceutical Chemistry, JSS College of Pharmacy, JSS Academy of Higher Education and Research, Ooty, Tamil Nadu, India
| | - Esakkimuthukumar Mariappan
- Department of Pharmaceutical Chemistry, JSS College of Pharmacy, JSS Academy of Higher Education and Research, Ooty, Tamil Nadu, India
| | - Jawahar Natarajan
- Department of Pharmaceutics, JSS College of Pharmacy, JSS Academy of Higher Education and Research, Ooty, Tamil Nadu, India
| | - Krishnan Namboori P K
- Amrita Molecular Modeling and Synthesis (AMMAS) Research lab, Amrita Vishwavidyapeetham, Amrita Nagar, Ettimadai, Coimbatore, Tamil Nadu, India
| | - Jubie Selvaraj
- Department of Pharmaceutical Chemistry, JSS College of Pharmacy, JSS Academy of Higher Education and Research, Ooty, Tamil Nadu, India.
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Oshima E, Hayashi Y, Xie Z, Sato H, Hitomi S, Shibuta I, Urata K, Ni J, Iwata K, Shirota T, Shinoda M. M2 macrophage-derived cathepsin S promotes peripheral nerve regeneration via fibroblast-Schwann cell-signaling relay. J Neuroinflammation 2023; 20:258. [PMID: 37946211 PMCID: PMC10636844 DOI: 10.1186/s12974-023-02943-2] [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: 07/18/2023] [Accepted: 10/31/2023] [Indexed: 11/12/2023] Open
Abstract
BACKGROUND Although peripheral nerves have an intrinsic self-repair capacity following damage, functional recovery is limited in patients. It is a well-established fact that macrophages accumulate at the site of injury. Numerous studies indicate that the phenotypic shift from M1 macrophage to M2 macrophage plays a crucial role in the process of axon regeneration. This polarity change is observed exclusively in peripheral macrophages but not in microglia and CNS macrophages. However, the molecular basis of axonal regeneration by M2 macrophage is not yet fully understood. Herein, we aimed to identify the M2 macrophage-derived axon regeneration factor. METHODS We established a peripheral nerve injury model by transection of the inferior alveolar nerve (IANX) in Sprague-Dawley rats. Transcriptome analysis was performed on the injured nerve. Recovery from sensory deficits in the mandibular region and histological reconnection of IAN after IANX were assessed in rats with macrophage depletion by clodronate. We investigated the effects of adoptive transfer of M2 macrophages or M2-derived cathepsin S (CTSS) on the sensory deficit. CTSS initiating signaling was explored by western blot analysis in IANX rats and immunohistochemistry in co-culture of primary fibroblasts and Schwann cells (SCs). RESULTS Transcriptome analysis revealed that CTSS, a macrophage-selective lysosomal protease, was upregulated in the IAN after its injury. Spontaneous but partial recovery from a sensory deficit in the mandibular region after IANX was abrogated by macrophage ablation at the injured site. In addition, a robust induction of c-Jun, a marker of the repair-supportive phenotype of SCs, after IANX was abolished by macrophage ablation. As in transcriptome analysis, CTSS was upregulated at the injured IAN than in the intact IAN. Endogenous recovery from hypoesthesia was facilitated by supplementation of CTSS but delayed by pharmacological inhibition or genetic silencing of CTSS at the injured site. Adoptive transfer of M2-polarized macrophages at this site facilitated sensory recovery dependent on CTSS in macrophages. Post-IANX, CTSS caused the cleavage of Ephrin-B2 in fibroblasts, which, in turn, bound EphB2 in SCs. CTSS-induced Ephrin-B2 cleavage was also observed in human sensory nerves. Inhibition of CTSS-induced Ephrin-B2 signaling suppressed c-Jun induction in SCs and sensory recovery. CONCLUSIONS These results suggest that M2 macrophage-derived CTSS contributes to axon regeneration by activating SCs via Ephrin-B2 shedding from fibroblasts.
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Affiliation(s)
- Eri Oshima
- Department of Oral and Maxillofacial Surgery, Showa University School of Dentistry, 2-1-1 Kitasenzoku, Ota-ku, Tokyo, 142-8515, Japan
- Department of Physiology, Nihon University School of Dentistry, 1-8-13, Kandasurugadai, Chiyoda-Ku, Tokyo, 101-8310, Japan
| | - Yoshinori Hayashi
- Department of Physiology, Nihon University School of Dentistry, 1-8-13, Kandasurugadai, Chiyoda-Ku, Tokyo, 101-8310, Japan.
| | - Zhen Xie
- Key Laboratory of Molecular Medicine and Biotherapy in the Ministry of Industry and Information Technology, Department of Biology, School of Life Science, Beijing Institute of Technology, Beijing, 100081, China
| | - Hitoshi Sato
- Department of Oral and Maxillofacial Surgery, Showa University School of Dentistry, 2-1-1 Kitasenzoku, Ota-ku, Tokyo, 142-8515, Japan
| | - Suzuro Hitomi
- Department of Physiology, Nihon University School of Dentistry, 1-8-13, Kandasurugadai, Chiyoda-Ku, Tokyo, 101-8310, Japan
| | - Ikuko Shibuta
- Department of Physiology, Nihon University School of Dentistry, 1-8-13, Kandasurugadai, Chiyoda-Ku, Tokyo, 101-8310, Japan
| | - Kentaro Urata
- Department of Complete Denture Prosthodontics, Nihon University School of Dentistry, 1-8-13, Kandasurugadai, Chiyoda-Ku, Tokyo, 101-8310, Japan
| | - Junjun Ni
- Key Laboratory of Molecular Medicine and Biotherapy in the Ministry of Industry and Information Technology, Department of Biology, School of Life Science, Beijing Institute of Technology, Beijing, 100081, China
| | - Koichi Iwata
- Department of Physiology, Nihon University School of Dentistry, 1-8-13, Kandasurugadai, Chiyoda-Ku, Tokyo, 101-8310, Japan
| | - Tatsuo Shirota
- Department of Oral and Maxillofacial Surgery, Showa University School of Dentistry, 2-1-1 Kitasenzoku, Ota-ku, Tokyo, 142-8515, Japan
| | - Masamichi Shinoda
- Department of Physiology, Nihon University School of Dentistry, 1-8-13, Kandasurugadai, Chiyoda-Ku, Tokyo, 101-8310, Japan
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Zhang K, Wang S, Wang Z, Jiang Y, Huang M, Liu N, Wang B, Meng X, Wu Z, Yan X, Zhang X. Critical roles of PU.1/cathepsin S activation in regulating inflammatory responses of macrophages in periodontitis. J Periodontal Res 2023; 58:939-947. [PMID: 37334752 DOI: 10.1111/jre.13153] [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: 12/01/2022] [Revised: 04/30/2023] [Accepted: 06/06/2023] [Indexed: 06/20/2023]
Abstract
OBJECTIVE To determine the critical roles of PU.1/cathepsin S activation in regulating inflammatory responses of macrophages during periodontitis. BACKGROUND Cathepsin S (CatS) is a cysteine protease and exerts important roles in the immune response. Elevated CatS has been found in the gingival tissues of periodontitis patients and is involved in alveolar bone destruction. However, the underlying mechanism of CatS-driven IL-6 production in periodontitis remains unclear. METHODS Western blot was applied to measure mature cathepsin S(mCatS) and IL-6 expression in gingival tissues from periodontitis patients and RAW264.7 cells exposed to lipopolysaccharide from Porphyromonas gingivalis (P.g. LPS). Immunofluorescence was applied to confirm the localization of PU.1, and CatS in the gingival tissues of periodontitis patients. ELISA was performed to determine IL-6 production by the P.g. LPS-exposed RAW264.7 cells. Knockdown by shRNA was used to determine the effects of PU.1 on p38/ nuclear factor (NF)-κB activation, mCatS expression and IL-6 production in RAW264.7 cells. RESULTS The expressions mCatS and IL-6 were significantly upregulated in gingival macrophages. In cultured RAW264.7 cells, increased mCatS and IL-6 protein paralleled the activation of p38 and NF-κB after exposure to P.g. LPS. CatS knockdown by shRNA significantly decreased P.g. LPS-induced IL-6 expression and p38/NF-κB activation. PU.1 was significantly increased in P.g. LPS-exposed RAW264.7 cells, and PU.1 knockdown dramatically abolished the P.g. LPS-induced upregulation of mCatS and IL-6 and the activation of p38 and NF-κB. Furthermore, PU.1 and CatS colocalized in macrophages within the gingival tissues of periodontitis patients. CONCLUSION PU.1-dependent CatS drives IL-6 production in macrophages by activating p38 and NF-κB in periodontitis.
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Affiliation(s)
- Kaige Zhang
- Department of Oral Implantology, Liaoning Provincial Key Laboratory of Oral Diseases, School and Hospital of Stomatology, China Medical University, Shenyang, China
| | - Sijian Wang
- Department of Oral Implantology, Liaoning Provincial Key Laboratory of Oral Diseases, School and Hospital of Stomatology, China Medical University, Shenyang, China
| | - Zihan Wang
- Department of Oral Implantology, Liaoning Provincial Key Laboratory of Oral Diseases, School and Hospital of Stomatology, China Medical University, Shenyang, China
| | - Yiming Jiang
- The VIP Department, Liaoning Provincial Key Laboratory of Oral Diseases, School and Hospital of Stomatology, China Medical University, Shenyang, China
| | - Minghao Huang
- Department of Oral Implantology, Liaoning Provincial Key Laboratory of Oral Diseases, School and Hospital of Stomatology, China Medical University, Shenyang, China
| | - Nanqi Liu
- Department of Biochemistry and Molecular Biology, School of Life Sciences, China Medical University, Shenyang, China
| | - Biao Wang
- Department of Biochemistry and Molecular Biology, School of Life Sciences, China Medical University, Shenyang, China
| | - Xin Meng
- Department of Biochemistry and Molecular Biology, School of Life Sciences, China Medical University, Shenyang, China
| | - Zhou Wu
- Department of Aging Science and Pharmacology, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
- OBT Research Center, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Xu Yan
- The VIP Department, Liaoning Provincial Key Laboratory of Oral Diseases, School and Hospital of Stomatology, China Medical University, Shenyang, China
| | - Xinwen Zhang
- Department of Oral Implantology, Liaoning Provincial Key Laboratory of Oral Diseases, School and Hospital of Stomatology, China Medical University, Shenyang, China
- Laboratory Animal Centre, School and Hospital of Stomatology, China Medical University, Shenyang, Liaoning, China
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Mukherjee S, Ghosh S, Bawali S, Chatterjee R, Saha A, Sengupta A, Keswani T, Sarkar S, Ghosh P, Chakraborty S, Khamaru P, Bhattacharyya A. Administration of soluble gp130Fc disrupts M-1 macrophage polarization, dendritic cell activation, MDSC expansion and Th-17 induction during experimental cerebral malaria. Int Immunopharmacol 2023; 123:110671. [PMID: 37494839 DOI: 10.1016/j.intimp.2023.110671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 07/05/2023] [Accepted: 07/17/2023] [Indexed: 07/28/2023]
Abstract
Regulatory effect of IL-6 on various immune cells plays a crucial role during experimental cerebral malaria pathogenesis. IL-6 neutralization can restore distorted ratios of myeloid dendritic cells and plasmacytoid dendritic cells as well as the balance between Th-17 and T-regulatory cells. IL-6 can also influence immune cells through classical and trans IL-6 signalling pathways. As trans IL-6 signalling is reportedly involved during malaria pathogenesis, we focused on studying the effects of trans IL-6 signalling blockade on various immune cell populations and how they regulate ECM progression. Results show that administration of sgp130Fc recombinant chimera protein lowers the parasitemia, increases the survivability of Plasmodium berghei ANKA infected mice, and restores the distorted ratios of M1/M2 macrophage, mDC/pDC, and Th-17/Treg. IL-6 trans signalling blockade has been found to affect both expansion of myeloid derived suppressor cells (MDSCs) and expression of inflammatory markers on them during Plasmodium berghei ANKA infection indicating that trans IL-6 signalling might regulate various immune cells and their function during ECM. In this work for the first time, we delineate the effect of sgp130Fc administration on influencing the immunological changes within the host secondary lymphoid organ during ECM induced by Plasmodium berghei ANKA infection.
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Affiliation(s)
- Saikat Mukherjee
- Immunology Laboratory, Department of Zoology, University of Calcutta. 35, Ballygunge Circular Road, Kolkata-700019, West Bengal, India
| | - Soubhik Ghosh
- Immunology Laboratory, Department of Zoology, University of Calcutta. 35, Ballygunge Circular Road, Kolkata-700019, West Bengal, India
| | - Sriparna Bawali
- Immunology Laboratory, Department of Zoology, University of Calcutta. 35, Ballygunge Circular Road, Kolkata-700019, West Bengal, India
| | - Rimbik Chatterjee
- Immunology Laboratory, Department of Zoology, University of Calcutta. 35, Ballygunge Circular Road, Kolkata-700019, West Bengal, India
| | - Atreyee Saha
- Immunology Laboratory, Department of Zoology, University of Calcutta. 35, Ballygunge Circular Road, Kolkata-700019, West Bengal, India
| | - Anirban Sengupta
- Department of Biomedical and Clinical Sciences, Linköping University, 58185 Linköping, Sweden
| | - Tarun Keswani
- Center for Immunological and Inflammatory Diseases, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA 149 13th Street Charlestown, MA 02129, USA
| | - Samrat Sarkar
- Immunology Laboratory, Department of Zoology, University of Calcutta. 35, Ballygunge Circular Road, Kolkata-700019, West Bengal, India
| | - Pronabesh Ghosh
- Immunology Laboratory, Department of Zoology, University of Calcutta. 35, Ballygunge Circular Road, Kolkata-700019, West Bengal, India
| | - Sayan Chakraborty
- Immunology Laboratory, Department of Zoology, University of Calcutta. 35, Ballygunge Circular Road, Kolkata-700019, West Bengal, India
| | - Poulomi Khamaru
- Immunology Laboratory, Department of Zoology, University of Calcutta. 35, Ballygunge Circular Road, Kolkata-700019, West Bengal, India
| | - Arindam Bhattacharyya
- Immunology Laboratory, Department of Zoology, University of Calcutta. 35, Ballygunge Circular Road, Kolkata-700019, West Bengal, India.
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Rose-John S, Jenkins BJ, Garbers C, Moll JM, Scheller J. Targeting IL-6 trans-signalling: past, present and future prospects. Nat Rev Immunol 2023; 23:666-681. [PMID: 37069261 PMCID: PMC10108826 DOI: 10.1038/s41577-023-00856-y] [Citation(s) in RCA: 59] [Impact Index Per Article: 59.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/01/2023] [Indexed: 04/19/2023]
Abstract
Interleukin-6 (IL-6) is a key immunomodulatory cytokine that affects the pathogenesis of diverse diseases, including autoimmune diseases, chronic inflammatory conditions and cancer. Classical IL-6 signalling involves the binding of IL-6 to the membrane-bound IL-6 receptor α-subunit (hereafter termed 'mIL-6R') and glycoprotein 130 (gp130) signal-transducing subunit. By contrast, in IL-6 trans-signalling, complexes of IL-6 and the soluble form of IL-6 receptor (sIL-6R) signal via membrane-bound gp130. A third mode of IL-6 signalling - known as cluster signalling - involves preformed complexes of membrane-bound IL-6-mIL-6R on one cell activating gp130 subunits on target cells. Antibodies and small molecules have been developed that block all three forms of IL-6 signalling, but in the past decade, IL-6 trans-signalling has emerged as the predominant pathway by which IL-6 promotes disease pathogenesis. The first selective inhibitor of IL-6 trans-signalling, sgp130, has shown therapeutic potential in various preclinical models of disease and olamkicept, a sgp130Fc variant, had promising results in phase II clinical studies for inflammatory bowel disease. Technological developments have already led to next-generation sgp130 variants with increased affinity and selectivity towards IL-6 trans-signalling, along with indirect strategies to block IL-6 trans-signalling. Here, we summarize our current understanding of the biological outcomes of IL-6-mediated signalling and the potential for targeting this pathway in the clinic.
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Affiliation(s)
- Stefan Rose-John
- Biochemical Institute, Medical Faculty, Christian-Albrechts-University, Kiel, Germany
| | - Brendan J Jenkins
- Centre for Innate Immunity and Infectious Diseases, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Molecular and Translational Science, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia
| | - Christoph Garbers
- Department of Pathology, Otto-von-Guericke-University Magdeburg, Medical Faculty, Magdeburg, Germany
- Health Campus Immunology, Infectiology and Inflammation (GC:I3), Otto-von-Guericke-University, Magdeburg, Germany
- Center for Health and Medical Prevention (CHaMP), Otto-von-Guericke-University, Magdeburg, Germany
| | - Jens M Moll
- Institute of Biochemistry and Molecular Biology II, Medical Faculty, Heinrich-Heine-University, Düsseldorf, Germany
| | - Jürgen Scheller
- Institute of Biochemistry and Molecular Biology II, Medical Faculty, Heinrich-Heine-University, Düsseldorf, Germany.
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Li Y, Hashikawa K, Ebisawa K, Kambe M, Higuchi S, Kamei Y. <Editors' Choice> Supernatant from activated omentum accelerates wound healing in diabetic mice wound model. NAGOYA JOURNAL OF MEDICAL SCIENCE 2023; 85:528-541. [PMID: 37829482 PMCID: PMC10565575 DOI: 10.18999/nagjms.85.3.528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Accepted: 10/04/2022] [Indexed: 10/14/2023]
Abstract
Diabetic wounds are considered one of the most frequent and severe complications of diabetes mellitus. Recently, the omentum has been used in diabetic wound healing because of its tissue repair properties. The activated omentum is richer in growth factors than the inactivated, thereby contributing to the wound healing process. To further investigate the effect of activated omentum conditioned medium (aOCM) on diabetic wound healing, we injected supernatant from aOCM, saline-OCM (sOCM), inactivated-OCM (iOCM), and medium (M) subcutaneously upon creation of a cutaneous wound healing model in diabetic mice. Wound area (%) was evaluated on days 0, 3, 5, 7, 9, 11, 14, 21, and 28 post-operation. At 9 and 28 d post-operation, skin tissue was harvested and assessed for gross observation, neovascularization, peripheral nerve fiber regeneration, and collagen deposition. We observed that aOCM enhanced the wound repair process, with significant acceleration of epidermal and collagen deposition in the surgical lesion on day 9. Additionally, aOCM displayed marked efficiency in neovascularization and peripheral nerve regeneration during wound healing. Thus, aOCM administration exerts a positive influence on the diabetic mouse model, which can be employed as a new therapy for diabetic wounds.
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Affiliation(s)
- Yu Li
- Department of Plastic and Reconstructive Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Kazunobu Hashikawa
- Department of Plastic and Reconstructive Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Katsumi Ebisawa
- Department of Plastic and Reconstructive Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Miki Kambe
- Department of Plastic and Reconstructive Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Shinichi Higuchi
- Department of Plastic and Reconstructive Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yuzuru Kamei
- Department of Plastic and Reconstructive Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan
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Nickle RA, DeOca KB, Garcia BL, Mannie MD. Soluble CD25 imposes a low-zone IL-2 signaling environment that favors competitive outgrowth of antigen-experienced CD25 high regulatory and memory T cells. Cell Immunol 2023; 384:104664. [PMID: 36642016 PMCID: PMC10257407 DOI: 10.1016/j.cellimm.2023.104664] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Revised: 10/13/2022] [Accepted: 01/03/2023] [Indexed: 01/07/2023]
Abstract
This study focused on soluble (s)CD25-mediated regulation of IL-2 signaling in murine and human CD4+ T cells. Recombinant sCD25 reversibly sequestered IL-2 to limit acute maximal proliferative responses while preserving IL-2 bioavailability to subsequently maintain low-zone IL-2 signaling during prolonged culture. By inhibiting IL-2 signaling during acute activation, sCD25 suppressed T-cell growth and inhibited IL-2-evoked transmembrane CD25 expression, thereby resulting in lower prevalence of CD25high T cells. By inhibiting IL-2 signaling during quiescent IL-2-mediated growth, sCD25 competed with transmembrane CD25, IL2Rβγ, and IL2Rαβγ receptors for limited pools of IL-2 such that sCD25 exhibited strong or weak inhibitory efficacy in IL-2-stimulated cultures of CD25low or CD25high T cells, respectively. Preferential blocking of IL-2 signaling in CD25low but not CD25high T cells caused competitive enrichment of CD25high memory/effector and regulatory FOXP3+ subsets. In conclusion, sCD25 modulates IL-2 bioavailability to limit CD25 expression during acute activation while enhancing CD25highT-cell dominance during low-zone homeostatic IL-2-mediated expansion, thereby 'flattening' the inflammatory curve over time.
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Affiliation(s)
- Rebecca A Nickle
- Department of Microbiology and Immunology, Brody School of Medicine, East Carolina University, Greenville, NC, USA.
| | - Kayla B DeOca
- Department of Microbiology and Immunology, Brody School of Medicine, East Carolina University, Greenville, NC, USA.
| | - Brandon L Garcia
- Department of Microbiology and Immunology, Brody School of Medicine, East Carolina University, Greenville, NC, USA.
| | - Mark D Mannie
- Department of Microbiology and Immunology, Brody School of Medicine, East Carolina University, Greenville, NC, USA.
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Smyth P, Sasiwachirangkul J, Williams R, Scott CJ. Cathepsin S (CTSS) activity in health and disease - A treasure trove of untapped clinical potential. Mol Aspects Med 2022; 88:101106. [PMID: 35868042 DOI: 10.1016/j.mam.2022.101106] [Citation(s) in RCA: 32] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 06/24/2022] [Accepted: 07/11/2022] [Indexed: 12/14/2022]
Abstract
Amongst the lysosomal cysteine cathepsin family of proteases, cathepsin S (CTSS) holds particular interest due to distinctive properties including a normal restricted expression profile, inducible upregulation and activity at a broad pH range. Consequently, while CTSS is well-established as a member of the proteolytic cocktail within the lysosome, degrading unwanted and damaged proteins, it has increasingly been shown to mediate a number of distinct, more selective roles including antigen processing and antigen presentation, and cleavage of substrates both intra and extracellularly. Increasingly, aberrant CTSS expression has been demonstrated in a variety of conditions and disease states, marking it out as both a biomarker and potential therapeutic target. This review seeks to contextualise CTSS within the cysteine cathepsin family before providing an overview of the broad range of pathologies in which roles for CTSS have been identified. Additionally, current clinical progress towards specific inhibitors is detailed, updating the position of the field in exploiting this most unique of proteases.
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Affiliation(s)
- Peter Smyth
- The Patrick G Johnston Centre for Cancer Research, Queen's University, 97 Lisburn Road, Belfast, BT9 7AE, UK
| | - Jutharat Sasiwachirangkul
- The Patrick G Johnston Centre for Cancer Research, Queen's University, 97 Lisburn Road, Belfast, BT9 7AE, UK
| | - Rich Williams
- The Patrick G Johnston Centre for Cancer Research, Queen's University, 97 Lisburn Road, Belfast, BT9 7AE, UK
| | - Christopher J Scott
- The Patrick G Johnston Centre for Cancer Research, Queen's University, 97 Lisburn Road, Belfast, BT9 7AE, UK.
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All Roads Lead to Cathepsins: The Role of Cathepsins in Non-Alcoholic Steatohepatitis-Induced Hepatocellular Carcinoma. Biomedicines 2022; 10:biomedicines10102351. [PMID: 36289617 PMCID: PMC9598942 DOI: 10.3390/biomedicines10102351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 09/16/2022] [Accepted: 09/16/2022] [Indexed: 11/17/2022] Open
Abstract
Cathepsins are lysosomal proteases that are essential to maintain cellular physiological homeostasis and are involved in multiple processes, such as immune and energy regulation. Predominantly, cathepsins reside in the lysosomal compartment; however, they can also be secreted by cells and enter the extracellular space. Extracellular cathepsins have been linked to several pathologies, including non-alcoholic steatohepatitis (NASH) and hepatocellular carcinoma (HCC). NASH is an increasingly important risk factor for the development of HCC, which is the third leading cause of cancer-related deaths and poses a great medical and economic burden. While information regarding the involvement of cathepsins in NASH-induced HCC (NASH-HCC) is limited, data to support the role of cathepsins in either NASH or HCC is accumulating. Since cathepsins play a role in both NASH and HCC, it is likely that the role of cathepsins is more significant in NASH-HCC compared to HCC derived from other etiologies. In the current review, we provide an overview on the available data regarding cathepsins in NASH and HCC, argue that cathepsins play a key role in the transition from NASH to HCC, and shed light on therapeutic options in this context.
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Chiang YR, Wang LC, Lin HT, Lin JHY. Bioactivity of orange-spotted grouper (Epinephelus coioides) cathepsin L: Proteolysis of bacteria and regulation of the innate immune response. FISH & SHELLFISH IMMUNOLOGY 2022; 122:399-408. [PMID: 35176469 DOI: 10.1016/j.fsi.2022.02.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 01/27/2022] [Accepted: 02/01/2022] [Indexed: 06/14/2023]
Abstract
Cathepsin L (CTSL) is a cysteine endopeptidase involved in protein degradation mainly in lysosomes. Following activation in an acidic environment, it plays a key role in a variety of physiological, immunological, and pathological processes. The biological function of CTSL in teleost remains unclear. Immunohistochemical analysis revealed that CTSL was expressed mainly in lymphoid organs, head kidney, trunk kidney, and liver, which particularly was expressed in leukocyte-like cells. We performed two forms of recombinant CTSL (rCTSL and rTCTSL) derived from orange-spotted grouper (Epinephelus coioides) to elucidate the role of CTSL in teleost innate immunity, based on differences in immune-related gene expression. We determined that rCTSL has a proteolytic function whereas rTCTSL does not. Under CTSL activation, we observed increases in IL-1β, IL-6, IL-12, IFNγ, CCL-1, CCL-3, epinecidin-1, lysozyme, and IgM. The bacteriolytic activity of rCTSL was more pronounced against Gram-positive bacteria than Gram-negative bacteria. Our findings indicate CTSL plays multiple roles in the reactions of innate immunity.
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Affiliation(s)
- Yun-Ru Chiang
- School of Veterinary Medicine, National Taiwan University, Taipei, Taiwan
| | - Lih-Chiann Wang
- School of Veterinary Medicine, National Taiwan University, Taipei, Taiwan
| | - Han-Tso Lin
- Department of Biotechnology, Ming Chuan University, Taoyuan, Taiwan
| | - John Han-You Lin
- School of Veterinary Medicine, National Taiwan University, Taipei, Taiwan.
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Schumertl T, Lokau J, Rose-John S, Garbers C. Function and proteolytic generation of the soluble interleukin-6 receptor in health and disease. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2021; 1869:119143. [PMID: 34626681 DOI: 10.1016/j.bbamcr.2021.119143] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 09/03/2021] [Accepted: 09/08/2021] [Indexed: 12/20/2022]
Abstract
The pleiotropic cytokine interleukin-6 (IL-6) is involved in numerous physiological and pathophysiological functions that include development, immune cell differentiation, inflammation and cancer. IL-6 can signal via the membrane-bound IL-6 receptor (IL-6R, classic signaling) or via soluble forms of the IL-6R (sIL-6R, trans-signaling). Both modes of signaling induce the formation of a homodimer of the signal transducing β-receptor glycoprotein 130 (gp130) and the activation of several intracellular signaling cascades, e.g. the Jak/STAT pathway. Intriguingly, only IL-6 trans-signaling is required for the pro-inflammatory properties of IL-6, while regenerative and anti-inflammatory functions are mediated via classic signaling. The sIL-6R is generated by different molecular mechanisms, including alternative mRNA splicing, proteolysis of the membrane-bound IL-6R and the release of extracellular vesicles. In this review, we give an in-depth overview on these molecular mechanisms with a special emphasize on IL-6R cleavage by the metalloprotease ADAM17 and other proteases. We discuss the biological functions of the sIL-6R and highlight attempts to selectively block IL-6 trans-signaling in pre-clinical animal models as well as in clinical studies in patients with inflammatory bowel disease.
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Affiliation(s)
- Tim Schumertl
- Department of Pathology, Otto-von-Guericke-University Magdeburg, Medical Faculty, Magdeburg, Germany
| | - Juliane Lokau
- Department of Pathology, Otto-von-Guericke-University Magdeburg, Medical Faculty, Magdeburg, Germany
| | | | - Christoph Garbers
- Department of Pathology, Otto-von-Guericke-University Magdeburg, Medical Faculty, Magdeburg, Germany.
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Rose-John S. Blocking only the bad side of IL-6 in inflammation and cancer. Cytokine 2021; 148:155690. [PMID: 34474215 DOI: 10.1016/j.cyto.2021.155690] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 08/17/2021] [Accepted: 08/19/2021] [Indexed: 02/07/2023]
Abstract
Interleukin-6 (IL-6) is considered an inflammatory cytokine, which is involved not only in most inflammatory states but it also plays a prominent role in inflammation associated cancers. The response of cells to the cytokine strictly depends on the presence of the IL-6 receptor (IL-6R),which presents IL-6 to the signal transducing receptor subunit gp130, which is expressed on all cells of the body. The expression of IL-6R is limited to some cells, which are therefore IL-6 target cells. The IL-6R can be cleaved by proteases and the thus generated soluble IL-6R (sIL-6R) still binds the ligand IL-6. The complex of IL-6 and sIL-6R can bind to gp130 on any cell, induce dimerization of gp130 and intracellular signaling. This process has been named IL-6 trans-signaling. A fusion protein of soluble gp130 with the constant portion of human IgG1 (sgp130Fc) turned out to be a potent and specific inhibitor of IL-6 trans-signaling. In many animal models of human diseases the significance of IL-6 trans-signaling has been analyzed. It turned out that the activities of IL-6 mediated by the sIL-6R are the pro-inflammatory activities of the cytokine whereas activities of IL-6 mediated by the membrane-bound IL-6R are rather protective and regenerative. The sgp130Fc protein has recently been developed into a biologic. The possible consequences of a specific IL-6 trans-signaling blockade is discussed in the light of the recent successfully concluded phase II clinical trials in patients with inflammatory bowel disease.
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Rose-John S. Therapeutic targeting of IL-6 trans-signaling. Cytokine 2021; 144:155577. [PMID: 34022535 DOI: 10.1016/j.cyto.2021.155577] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 05/04/2021] [Accepted: 05/06/2021] [Indexed: 02/06/2023]
Abstract
Interleukin-6 (IL-6) is a cytokine, which is involved in innate and acquired immunity, in neural cell maintenance and in metabolism. IL-6 can be synthesized by many different cells including myeloid cells, fibroblasts, endothelial cells and lymphocytes. The synthesis of IL-6 is strongly stimulated by Toll like receptors and by IL-1. Therefore, IL-6 levels in the body are high during infection and inflammatory processes. Moreover, IL-6 is a prominent growth factor of tumor cells and plays a major role in inflammation associated cancer. On target cells, IL-6 binds to an IL-6 receptor, which is not signaling competent. The complex of IL-6 and IL-6 receptor associate with a second receptor subunit, glycoprotein gp130, which dimerizes and initiates intracellular signaling. Cells, which do not express the IL-6 receptor are not responsive to IL-6. They can, however, be stimulated by the complex of IL-6 and a soluble form of the IL-6 receptor, which is generated by limited proteolysis and to a lesser extent by translation from an alternatively spliced mRNA. This process has been named IL-6 trans-signaling. This review article will explain the biology of IL-6 trans-signaling and the specific inhibition of this mode of signaling, which has been recognized to be fundamental in inflammation and cancer.
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