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Drakul M, Tomić S, Bekić M, Mihajlović D, Vasiljević M, Rakočević S, Đokić J, Popović N, Bokonjić D, Čolić M. Sitagliptin Induces Tolerogenic Human Dendritic Cells. Int J Mol Sci 2023; 24:16829. [PMID: 38069152 PMCID: PMC10706581 DOI: 10.3390/ijms242316829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 11/05/2023] [Accepted: 11/07/2023] [Indexed: 12/18/2023] Open
Abstract
Sitagliptin, an anti-diabetic drug, is a dipeptidyl peptidase (DPP)-4/CD26 inhibitor with additional anti-inflammatory and immunomodulatory properties. In this study, we investigated for the first time the effect of sitagliptin on the differentiation and functions of human dendritic cells generated from monocytes (MoDCs) for 4 days using the standard GM-CSF/IL-4 procedure. LPS/IFN-γ treatment for an additional 24 h was used for maturation induction of MoDCs. Sitagliptin was added at the highest non-cytotoxic concentration (500 µg/mL) either at the beginning (sita 0d protocol) or after MoDC differentiation (sita 4d protocol). Sitagliptin impaired differentiation and maturation of MoDCs as judged with the lower expression of CD40, CD83, CD86, NLRP3, and HLA-DR, retention of CD14 expression, and inhibited production of IL-β, IL-12p70, IL-23, and IL-27. In contrast, the expression of CD26, tolerogenic DC markers (ILT4 and IDO1), and production of immunoregulatory cytokines (IL-10 and TGF-β) were increased. Generally, the sita 0d protocol was more efficient. Sitagliptin-treated MoDCs were poorer allostimulators of T-cells in MoDC/T-cell co-culture and inhibited Th1 and Th17 but augmented Th2 and Treg responses. Tolerogenic properties of sitagliptin-treated MoDCs were additionally confirmed by an increased frequency of CD4+CD25+CD127- FoxP3+ Tregs and Tr1 cells (CD4+IL-10+FoxP3-) in MoDC/T-cell co-culture. The differentiation of IL-10+ and TGF-β+ Tregs depended on the sitagliptin protocol used. A Western blot analysis showed that sitagliptin inhibited p65 expression of NF-kB and p38MAPK during the maturation of MoDCs. In conclusion, sitagliptin induces differentiation of tolerogenic DCs, and the effect is important when considering sitagliptin for treating autoimmune diseases and allotransplant rejection.
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Affiliation(s)
- Marija Drakul
- Medical Faculty Foca, University of East Sarajevo, 73300 Foča, R. Srpska, Bosnia and Herzegovina; (M.D.); (D.M.); (M.V.); (S.R.); (D.B.)
| | - Sergej Tomić
- Institute for the Application of Nuclear Energy, University of Belgrade, 11000 Belgrade, Serbia; (S.T.); (M.B.)
| | - Marina Bekić
- Institute for the Application of Nuclear Energy, University of Belgrade, 11000 Belgrade, Serbia; (S.T.); (M.B.)
| | - Dušan Mihajlović
- Medical Faculty Foca, University of East Sarajevo, 73300 Foča, R. Srpska, Bosnia and Herzegovina; (M.D.); (D.M.); (M.V.); (S.R.); (D.B.)
| | - Miloš Vasiljević
- Medical Faculty Foca, University of East Sarajevo, 73300 Foča, R. Srpska, Bosnia and Herzegovina; (M.D.); (D.M.); (M.V.); (S.R.); (D.B.)
| | - Sara Rakočević
- Medical Faculty Foca, University of East Sarajevo, 73300 Foča, R. Srpska, Bosnia and Herzegovina; (M.D.); (D.M.); (M.V.); (S.R.); (D.B.)
| | - Jelena Đokić
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, 11000 Belgrade, Serbia; (J.Đ.); (N.P.)
| | - Nikola Popović
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, 11000 Belgrade, Serbia; (J.Đ.); (N.P.)
| | - Dejan Bokonjić
- Medical Faculty Foca, University of East Sarajevo, 73300 Foča, R. Srpska, Bosnia and Herzegovina; (M.D.); (D.M.); (M.V.); (S.R.); (D.B.)
| | - Miodrag Čolić
- Medical Faculty Foca, University of East Sarajevo, 73300 Foča, R. Srpska, Bosnia and Herzegovina; (M.D.); (D.M.); (M.V.); (S.R.); (D.B.)
- Serbian Academy of Sciences and Arts, 11000 Belgrade, Serbia
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Ohm B, Moneke I, Jungraithmayr W. Targeting cluster of differentiation 26 / dipeptidyl peptidase 4 (CD26/DPP4) in organ fibrosis. Br J Pharmacol 2023; 180:2846-2861. [PMID: 36196001 DOI: 10.1111/bph.15967] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 09/07/2022] [Accepted: 09/29/2022] [Indexed: 11/28/2022] Open
Abstract
Cluster of differentiation 26 (CD26)/dipeptidyl peptidase 4 (DPP4) is an exopeptidase that is expressed as a transmembrane protein in many organs but also present in a circulating soluble form. Beyond its enzymatic and costimulatory activity, CD26/DPP4 is involved in the pathogenesis of chronic fibrotic diseases across many organ types, such as liver cirrhosis, kidney fibrosis and lung fibrosis. Organ fibrosis is associated with a high morbidity and mortality, and there are no causative therapies that can effectively attenuate the progress of the disease. Growing evidence suggests that inhibiting CD26/DPP4 can modulate the profibrotic tissue microenvironment and thus reduce fibrotic changes within affected organs. This review summarizes the role of CD26/DPP4 in fibroproliferative disorders and highlights new opportunities for an antifibrotic treatment by CD26/DPP4 inhibition. As a major advantage, CD26/DPP4 inhibitors have been in safe and routine clinical use in type 2 diabetes for many years and thus qualify for repurposing to repurpose as a promising therapeutic against fibrosis. LINKED ARTICLES: This article is part of a themed issue on Translational Advances in Fibrosis as a Therapeutic Target. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v180.22/issuetoc.
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Affiliation(s)
- Birte Ohm
- Department of Thoracic Surgery, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Isabelle Moneke
- Department of Thoracic Surgery, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Wolfgang Jungraithmayr
- Department of Thoracic Surgery, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
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Cai X, Deng J, Shi W, Cai Y, Ma Z. Mining the potential therapeutic targets for COVID-19 infection in patients with severe burn injuries via bioinformatics analysis. Int Wound J 2023; 20:2742-2752. [PMID: 36924127 PMCID: PMC10410338 DOI: 10.1111/iwj.14151] [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: 12/27/2022] [Revised: 02/24/2023] [Accepted: 02/27/2023] [Indexed: 03/18/2023] Open
Abstract
The Coronavirus Disease-19 (COVID-19) pandemic is posing a serious challenge to human health. Burn victims are susceptible to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection leading to delayed recovery and even profound debilitation. Nevertheless, the molecular mechanisms underlying COVID-19 and severe burn are yet to be elucidated. In our work, the differentially expressed genes (DEGs) were identified from GSE157852 and GSE19743, and the common DEGs between COVID-19 and severe burn were extracted. Gene Ontology (GO), Kyoto Encyclopedia of Genes and Genomes (KEGG), protein-protein interactions (PPI), gene coexpression network, and multifactor regulatory network analysis of hub genes were carried out. A total of 44 common DEGs were found between COVID-19 and severe burn. Functional analyses indicated that the pathways of immune regulation and cytokine response participated collectively in the development of severe burn and progression of COVID-19. Ten significant hub genes were identified, including MERTK, SIRPA, TLR3, ITGB1, DPP4, PTPRC, LY75, IFIT1, IL4R, and CD2. In addition, the gene coexpression network and regulatory network were constructed containing 42 microRNAs (miRNAs) and 2 transcription factors (TFs). Our study showed the shared pathogenic link between COVID-19 and severe burn. The identified common genes and pivotal pathways pave a new road for future mechanistic researches in severe burn injuries complicated with COVID-19.
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Affiliation(s)
- Xueyao Cai
- Department of Burn and Plastic SurgeryDongguan Tungwah HospitalDongguanChina
| | - Jing Deng
- Department of Burn and Plastic SurgeryDongguan Tungwah HospitalDongguanChina
| | - Wenjun Shi
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Yuchen Cai
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's HospitalShanghai Jiao Tong University School of MedicineShanghaiChina
| | - Zhengzheng Ma
- Department of Burn and Plastic SurgeryDongguan Tungwah HospitalDongguanChina
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Parry D, Allison K. Is the future scarless? - Fibroblasts as targets for scarless wound healing: a narrative review. Scars Burn Heal 2022; 8:20595131221095348. [PMID: 36082315 PMCID: PMC9445533 DOI: 10.1177/20595131221095348] [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] [Indexed: 11/16/2022] Open
Abstract
Introduction: Scarless healing is the ideal outcome of wound healing and is exhibited in some species. This narrative review assembles the current understanding of fibroblast heterogenicity along with the latest fibroblast-related targets for scar reduction therapies. Human regenerative wound healing is deemed possible due to the wound regeneration already seen in the early gestation foetus. Methods: This literature narrative review was undertaken by searching PubMed and Web of Science databases and Google Scholar to find articles concerning the fibroblast involvement in wound healing. We evaluated and collated these articles to form a consensus of the current understanding of the field. Discussion: This article describes current understanding of fibroblast heterogenicity and involvement in wound healing, focusing on the role of fibroblasts during physiological scarring. We also present the current most promising targets involving fibroblasts in the reduction of scarring and how we can manipulate the behaviour of fibroblasts to mimic the wound regeneration models in the human foetus. These targets include the pro-fibrotic EN1 positive fibroblast lineage, TGFβ1 inhibition, and genetic therapies utilising miRNAs and siRNAs. Conclusion: No therapies are currently available to eradicate scarring; however, treatment options are available to reduce the appearance of scarring. Further research into the heterogenicity and interactions of fibroblasts in both the foetus and adult is needed, and this may lead to the development of novel treatments against scarring.
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Affiliation(s)
- Dylan Parry
- Newcastle University Medical School, Newcastle upon Tyne, UK
| | - Keith Allison
- South Tees Hospitals NHS Foundation Trust, Middlesbrough, UK
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Abstract
Dipeptidyl peptidase 4 (DPP4), a serine protease expressed on luminal and apical cell membrane, is identical to the lymphocyte cell surface protein CD26. DPP4 rapidly deactivates hormones and cytokines by cleaving their NH2-terminal dipeptides. Its functions are based on membrane digestion and/or binding of bioactive peptides, signal molecules, and extracellular matrix components. The soluble form is also present in body fluids such as serum, urine, semen, and synovial fluid. The extremely broad distribution of CD26/DPP4 indicates its divergent roles depending on cell type and activated conditions. The cellular localization was earlier examined by enzyme histochemistry and subsequently by immunohistochemistry. Although immunohistochemical analyses are higher in specificity and easier to use at electron microscopic levels than enzyme histochemistry, the immunoreaction is considerably affected by the animal species, types of tissue sections, and specificity of antibodies. Understanding of the functional significance and advancement of its clinical use (diagnosis and treatment of diseases) require precise information on the cellular distribution including subcellular localization and pathological changes. This short review summarizes in particular immunohistochemical findings on CD26/DPP4.
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Affiliation(s)
- Toshihiko Iwanaga
- Laboratory of Histology and Cytology, Department of Anatomy, Hokkaido University Graduate School of Medicine
| | - Junko Nio-Kobayashi
- Laboratory of Histology and Cytology, Department of Anatomy, Hokkaido University Graduate School of Medicine
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