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Penaforte-Saboia JG, Couri CEB, Albuquerque NV, Linard LLP, Araújo DAC, de Oliveira SKP, Gomes TFP, Pinheiro MM, Castelo MHCG, Fernandes VO, Montenegro Júnior RM. PRE1BRAZIL Protocol: A Randomized Controlled Trial to Evaluate the Effectiveness and Safety of the DPP-4 Inhibitor Alogliptin in Delaying the Progression of Stage 2 Type 1 Diabetes. Diabetes Metab Syndr Obes 2024; 17:857-864. [PMID: 38406268 PMCID: PMC10894513 DOI: 10.2147/dmso.s437635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Accepted: 12/12/2023] [Indexed: 02/27/2024] Open
Abstract
Background The incidence of Type 1 Diabetes Mellitus (T1DM) is on the rise. Since there is no curative treatment, it is urgent to look for therapies that can delay disease progression and protect pancreatic β-cells. Dipeptidyl peptidase-4 inhibitors (DPP-4i) have shown potential in modulating inflammation and preventing β-cell destruction. This protocol describes an upcoming trial to evaluate the effectiveness of the DPP-4i alogliptin in delaying the progression of stage 2 (presymptomatic) to stage 3 (symptomatic) T1DM. Patients and Methods We propose a two-year, two-arm, multicenter, randomized, open-label clinical trial targeting Brazilian patients aged 18 to 35 with stage 2 T1DM. The study, facilitated by the custom-developed "PRE1BRAZIL" web application, aims to enroll 130 participants. They will be randomly assigned in a 1:1 ratio to either a treatment group (alogliptin 25 mg daily plus regular clinical and laboratory assessments) or a control group (regular assessments only). The primary outcome is the rate of progression to stage 3 T1DM. Secondary outcomes include changes in A1c levels, glucose levels during a 2-hour oral glucose tolerance test (OGTT), C-peptide levels, exogenous insulin requirements, Insulin-Dose Adjusted A1c (IDAA1c), and the incidence of diabetic ketoacidosis (DKA) in those advancing to stage 3. Discussion This protocol outlines the first randomized clinical trial (RCT) to investigate the impact of a DPP-4i in the presymptomatic stage of T1DM. The trial is designed to provide critical insights into the role of DPP-4i in the secondary prevention of T1DM. Utilizing the "PRE1BRAZIL" web application is expected to enhance participant enrollment and reduce operational costs. Registration Brazilian Registry of Clinical Trials.
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Affiliation(s)
- Jaquellyne Gurgel Penaforte-Saboia
- Department of Clinical Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
- Clinical Research Unit, Walter Cantídio University Hospital, Federal University of Ceará/ EBSERH Fortaleza, Fortaleza, CE, Brazil
| | - Carlos Eduardo Barra Couri
- Center for Cell-Based Therapy, Regional Blood Center of Ribeirão Preto, Ribeirão Preto School of Medicine, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - Natasha Vasconcelos Albuquerque
- Clinical Research Unit, Walter Cantídio University Hospital, Federal University of Ceará/ EBSERH Fortaleza, Fortaleza, CE, Brazil
- Department of Community Health, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Lana Livia Peixoto Linard
- Department of Clinical Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
- Clinical Research Unit, Walter Cantídio University Hospital, Federal University of Ceará/ EBSERH Fortaleza, Fortaleza, CE, Brazil
| | | | | | - Thisciane Ferreira Pinto Gomes
- Clinical Research Unit, Walter Cantídio University Hospital, Federal University of Ceará/ EBSERH Fortaleza, Fortaleza, CE, Brazil
| | | | | | - Virgínia Oliveira Fernandes
- Clinical Research Unit, Walter Cantídio University Hospital, Federal University of Ceará/ EBSERH Fortaleza, Fortaleza, CE, Brazil
- Department of Community Health, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Renan Magalhães Montenegro Júnior
- Department of Clinical Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
- Clinical Research Unit, Walter Cantídio University Hospital, Federal University of Ceará/ EBSERH Fortaleza, Fortaleza, CE, Brazil
- Department of Community Health, Federal University of Ceará, Fortaleza, CE, Brazil
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Cafaro A, Schietroma I, Sernicola L, Belli R, Campagna M, Mancini F, Farcomeni S, Pavone-Cossut MR, Borsetti A, Monini P, Ensoli B. Role of HIV-1 Tat Protein Interactions with Host Receptors in HIV Infection and Pathogenesis. Int J Mol Sci 2024; 25:1704. [PMID: 38338977 PMCID: PMC10855115 DOI: 10.3390/ijms25031704] [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: 12/30/2023] [Revised: 01/19/2024] [Accepted: 01/23/2024] [Indexed: 02/12/2024] Open
Abstract
Each time the virus starts a new round of expression/replication, even under effective antiretroviral therapy (ART), the transactivator of viral transcription Tat is one of the first HIV-1 protein to be produced, as it is strictly required for HIV replication and spreading. At this stage, most of the Tat protein exits infected cells, accumulates in the extracellular matrix and exerts profound effects on both the virus and neighbor cells, mostly of the innate and adaptive immune systems. Through these effects, extracellular Tat contributes to the acquisition of infection, spreading and progression to AIDS in untreated patients, or to non-AIDS co-morbidities in ART-treated individuals, who experience inflammation and immune activation despite virus suppression. Here, we review the role of extracellular Tat in both the virus life cycle and on cells of the innate and adaptive immune system, and we provide epidemiological and experimental evidence of the importance of targeting Tat to block residual HIV expression and replication. Finally, we briefly review vaccine studies showing that a therapeutic Tat vaccine intensifies ART, while its inclusion in a preventative vaccine may blunt escape from neutralizing antibodies and block early events in HIV acquisition.
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Affiliation(s)
- Aurelio Cafaro
- National HIV/AIDS Research Center, Istituto Superiore di Sanità, 00161 Rome, Italy; (I.S.); (L.S.); (R.B.); (M.C.); (F.M.); (S.F.); (M.R.P.-C.); (A.B.); (P.M.)
| | | | | | | | | | | | | | | | | | | | - Barbara Ensoli
- National HIV/AIDS Research Center, Istituto Superiore di Sanità, 00161 Rome, Italy; (I.S.); (L.S.); (R.B.); (M.C.); (F.M.); (S.F.); (M.R.P.-C.); (A.B.); (P.M.)
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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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Zhang KW, Liu SY, Jia Y, Zou ML, Teng YY, Chen ZH, Li Y, Guo D, Wu JJ, Yuan ZD, Yuan FL. Insight into the role of DPP-4 in fibrotic wound healing. Biomed Pharmacother 2022; 151:113143. [PMID: 35643071 DOI: 10.1016/j.biopha.2022.113143] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Revised: 05/05/2022] [Accepted: 05/15/2022] [Indexed: 11/30/2022] Open
Abstract
Wound healing is a complex and long-term process consisting of hemostasis, inflammation, proliferation, and maturation/remodeling. These four stages overlap and influence each other; they affect wound healing in different ways, and if they do not function perfectly, they may cause scarring, proliferative scarring and keloid formation. A therapeutic target affecting wound healing in multiple ways will help the healing process proceed more effectively. DPP-4/CD26 is a multifunctional dimorphic glycoprotein widely distributed on the surface of a variety of cells, including fibroblasts and keratin-forming cells. It has been found to affect periwound inflammation, re-epithelialization, extracellular matrix secretion and skin fibrosis and is a potential target for promoting wound healing and inhibiting scar formation. After presenting a brief introduction of the wound healing process and DPP-4/CD26, this paper summarizes the effects of DPP-4/CD26 on cells involved in different stages of wound healing and discusses the feasibility of DPP-4/CD26 as a multifunctional target for the treatment of wound healing and inhibition of scar formation.
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Affiliation(s)
- Kai-Wen Zhang
- Department of Medicine, Institute of Integrated Traditional Chinese and Western Medicine, Wuxi Hospital of Integrated Traditional Chinese and Western Medicine, Nanjing University of Traditional Chinese Medicine, Wuxi, China
| | - Si-Yu Liu
- Department of Medicine, Institute of Integrated Traditional Chinese and Western Medicine, Wuxi Hospital of Integrated Traditional Chinese and Western Medicine, Nanjing University of Traditional Chinese Medicine, Wuxi, China
| | - Yuan Jia
- Department of Medicine, Institute of Integrated Traditional Chinese and Western Medicine, Wuxi Hospital of Integrated Traditional Chinese and Western Medicine, Nanjing University of Traditional Chinese Medicine, Wuxi, China
| | - Ming-Li Zou
- Department of Medicine, Institute of Integrated Traditional Chinese and Western Medicine, Wuxi Hospital of Integrated Traditional Chinese and Western Medicine, Nanjing University of Traditional Chinese Medicine, Wuxi, China
| | - Ying-Ying Teng
- The Hospital Affiliated to Jiangnan University, Wuxi, China
| | - Zhong-Hua Chen
- Department of Medicine, The Nantong University, Nantong, China
| | - Yueyue Li
- The Hospital Affiliated to Jiangnan University, Wuxi, China
| | - Danyang Guo
- The Hospital Affiliated to Jiangnan University, Wuxi, China
| | - Jun-Jie Wu
- Institute of Integrated Chinese and Western Medicine, The Hospital Affiliated to Jiangnan University, Wuxi, China
| | - Zheng-Dong Yuan
- Institute of Integrated Chinese and Western Medicine, The Hospital Affiliated to Jiangnan University, Wuxi, China
| | - Feng-Lai Yuan
- Department of Medicine, Institute of Integrated Traditional Chinese and Western Medicine, Wuxi Hospital of Integrated Traditional Chinese and Western Medicine, Nanjing University of Traditional Chinese Medicine, Wuxi, China; Institute of Integrated Chinese and Western Medicine, The Hospital Affiliated to Jiangnan University, Wuxi, China; The Hospital Affiliated to Jiangnan University, Wuxi, China.
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Wang X, Xiang J, Huang G, Kang L, Yang G, Wu H, Jiang K, Liang Z, Yang S. Inhibition of Podocytes DPP4 Activity Is a Potential Mechanism of Lobeliae Chinensis Herba in Treating Diabetic Kidney Disease. Front Pharmacol 2021; 12:779652. [PMID: 34950037 PMCID: PMC8688925 DOI: 10.3389/fphar.2021.779652] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Accepted: 11/17/2021] [Indexed: 01/23/2023] Open
Abstract
Diabetic kidney disease (DKD) is the leading cause of end-stage renal disease and has become a serious public health problem worldwide. Dipeptidyl peptidase-4 (DPP4) inhibitors, an emerging drug for the treatment of diabetes, have been found to have renoprotective effects in addition to glucose-lowering effects and therefore have the potential to be a treatment modality for DKD. Lobeliae Chinensis Herba (LCH), a traditional Chinese herb widely used in the treatment of diabetes, has recently been found to have a hypoglycaemic mechanism related to the inhibition of DPP4. Firstly, analysis of single-cell sequencing data from mouse kidneys in the National Center for Biotechnology Information (NCBI) database revealed that DPP4 was specifically upregulated in DKD podocytes and was associated with podocyte proliferation. Subsequently, the network pharmacology approach was applied to the screening of compounds. Twelve LCH active ingredients targeting DPP4 were extracted from the Traditional Chinese Medicine System Pharmacology (TCMSP) database. In addition, these 12 compounds and DPP4 were molecularly docked to predict the probability of them affecting DPP4 activity. In vitro, Quercetin, Methyl rosmarinate, Kaempferol, Diosmetin and Acacetin were demonstrated to retard podocyte proliferation by inhibiting DPP4 activity and were the top five compounds predicted by molecular docking to be the most likely to affect DPP4 activity. The half maximal inhibitory concentration (IC50) of the five compounds for DPP4 activity were as follows. Acacetin Log IC50 = −8.349, 95%CI (−9.266, −7.265), Diosmtrin Log IC50 = −8.419, 95%CI (−8.889, −7.950), Log IC50 = −8.349, 95%CI (−9.266, −7.265), Methyl rosmarinate Log IC50 = −8.415, 95%CI (−8.751, −8.085), Kaempferol Log IC50 = −8.297, 95%CI (−9.001, −7.615), Quercetin Log IC50 = −8.864, 95%CI (−9.107, −8.615). Finally, Quercetin, Methyl rosmarinate, Kaempferol, Diosmetin and Acacetin qualified for pharmacokinetic and drug similarity screening and have the potential to be the most promising oral agents for the treatment of DKD.
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Affiliation(s)
- Xinyu Wang
- Department of Geriatrics, The Second Clinical Medical College of Jinan University, Shenzhen People's Hospital, Jinan University, Shenzhen, China
| | - Jiaqing Xiang
- Department of Geriatrics, The Second Clinical Medical College of Jinan University, Shenzhen People's Hospital, Jinan University, Shenzhen, China
| | - Guixiao Huang
- The Third Affiliated Hospital of Shenzhen University, Shenzhen, China
| | - Lin Kang
- Department of Geriatrics, The Second Clinical Medical College of Jinan University, Shenzhen People's Hospital, Jinan University, Shenzhen, China
| | - Guangyan Yang
- Department of Geriatrics, The Second Clinical Medical College of Jinan University, Shenzhen People's Hospital, Jinan University, Shenzhen, China
| | - Han Wu
- Department of Endocrinology, The Second Clinical Medical College of Jinan University, Shenzhen People's Hospital, Jinan University, Shenzhen, China
| | - Kewei Jiang
- Department of Geriatrics, The Second Clinical Medical College of Jinan University, Shenzhen People's Hospital, Jinan University, Shenzhen, China
| | - Zhen Liang
- Department of Geriatrics, The Second Clinical Medical College of Jinan University, Shenzhen People's Hospital, Jinan University, Shenzhen, China
| | - Shu Yang
- Department of Geriatrics, The Second Clinical Medical College of Jinan University, Shenzhen People's Hospital, Jinan University, Shenzhen, China
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Saito A, Kitayama J, Horie H, Koinuma K, Kawashima R, Ohzawa H, Yamaguchi H, Kawahira H, Mimura T, Lefor AK, Sata N. Dipeptidyl Peptidase (DPP)-4 Inhibitor Impairs the Outcomes of Patients with Type 2 Diabetes Mellitus After Curative Resection for Colorectal Cancer. CANCER RESEARCH COMMUNICATIONS 2021; 1:106-114. [PMID: 36860286 PMCID: PMC9973397 DOI: 10.1158/2767-9764.crc-21-0042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 11/01/2021] [Accepted: 11/11/2021] [Indexed: 12/24/2022]
Abstract
Dipeptidyl peptidase IV inhibitor (DPP-4i) has been shown to act either as a promoter or as a suppressor for cancer. Although epidemiologic studies suggest that DPP-4i does not correlate with the development of malignancies, its effects on cancer metastases are controversial. We evaluated the impact of DPP-4i on postoperative outcomes of the diabetic patients with colorectal cancer and microscopic features of the resected tumors. In 260 consecutive patients with type 2 diabetes mellitus (T2DM) who underwent curative resection of colorectal cancer, the correlation between DPP-4i use and prognosis was retrospectively examined. Expression of Zeb1 on tumor cells and density of infiltrating immune cells were quantitatively evaluated with multicolor IHC in 40 tumors from DPP-4i users, 40 tumors from propensity score-matched users, and 40 tumors from nonusers. Postoperative disease-free survival (DFS) was significantly lower in 135 patients treated with DPP-4i compared with 125 nontreated patients [5-year DFS, 73.7% vs. 87.4%; HR, 1.98; 95% confidence interval (CI), 1.05-3.71; P = 0.035]. IHC revealed that the number of Zeb1+ tumor cells increased in tumors from DPP-4i-treated patients than tumors from nonusers (P < 0.01). The densities of CD3+ and CD8+ T cells were significantly lower in tumors from DPP-4i users (P < 0.01) with decreased density of tertiary lymphoid structures (P < 0.001). However, the density of M2-type tumor-associated macrophages with CD68+ CD163+ phenotypes was significantly higher (P < 0.01) in tumors from DPP-4i users. Exposure of colorectal cancer to DPP-4i may accelerate epithelial-to-mesenchymal transition (EMT) creating a tumor-permissive immune microenvironment, which might impair the outcomes of the patients with colorectal cancer and T2DM. Significance DPP-4i has been shown to enhance the antitumor effects of immunotherapy. However, we found that DPP-4i significantly impairs the outcomes of patients with colorectal cancer who underwent curative resection, possibly through acceleration of EMT and creation of a tumor-permissive immune microenvironment. This suggests that DPP-4i must be used with caution until its safety is fully confirmed by further studies of the mechanistic effects on existing cancers in humans.
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Affiliation(s)
- Akira Saito
- Department of Gastrointestinal Surgery, Jichi Medical University, Shimotsuke, Japan
| | - Joji Kitayama
- Department of Gastrointestinal Surgery, Jichi Medical University, Shimotsuke, Japan
- Corresponding Author: Joji Kitayama, Department of Gastrointestinal Surgery, Jichi Medical University, Yakushiji 3311-1, Shimotsuke, Tochigi 329-0498, Japan. Phone: 812-8558-8941; Fax: 812-8544-6811; E-mail:
| | - Hisanaga Horie
- Department of Gastrointestinal Surgery, Jichi Medical University, Shimotsuke, Japan
| | - Koji Koinuma
- Department of Gastrointestinal Surgery, Jichi Medical University, Shimotsuke, Japan
| | - Rie Kawashima
- Department of Oral and Maxillofacial Surgery, Jichi Medical University, Shimotsuke, Japan
| | - Hideyuki Ohzawa
- Departments of Clinical Oncology and Gastrointestinal Surgery, Jichi Medical University, Shimotsuke, Japan
| | - Hironori Yamaguchi
- Departments of Clinical Oncology and Gastrointestinal Surgery, Jichi Medical University, Shimotsuke, Japan
| | - Hiroshi Kawahira
- Department of Gastrointestinal Surgery, Jichi Medical University, Shimotsuke, Japan
| | - Toshiki Mimura
- Department of Gastrointestinal Surgery, Jichi Medical University, Shimotsuke, Japan
| | - Alan Kawarai Lefor
- Department of Gastrointestinal Surgery, Jichi Medical University, Shimotsuke, Japan
| | - Naohiro Sata
- Department of Gastrointestinal Surgery, Jichi Medical University, Shimotsuke, Japan
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Zinc Aspartate Induces IL-16 Secretion and Apoptosis in Human T Cells. Biomedicines 2021; 9:biomedicines9030246. [PMID: 33804583 PMCID: PMC7998552 DOI: 10.3390/biomedicines9030246] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 02/23/2021] [Accepted: 02/24/2021] [Indexed: 11/25/2022] Open
Abstract
T cell activation mediates immunity to pathogens. On the flipside, T cells are also involved in pathological immune responses during chronic autoimmune diseases. We recently reported that zinc aspartate, a registered drug with high bioavailability, dose-dependently inhibits T cell activation and Th1/Th2/Th17 cytokine production of stimulated human and mouse T cells. To understand the suppressive effect of zinc on T cell function, we here investigated the influence of zinc aspartate on human T cells focusing on the secretion of immunosuppressive cytokines, induction of apoptosis, and caspase 3/7 activity. To this end, we monitored either freshly stimulated or pre-activated human T cells in the presence of zinc aspartate from 40–140 µM over a period of 72 h. Under both experimental conditions, we observed a dose-dependent suppression of human T cell proliferation. While IL-1ra, latent TGF-β1, and IL-10 were dose-dependently reduced, we, unexpectedly, detected elevated levels of IL-16 upon zinc supplementation. In addition, the number of cells with active caspase 3/7 and, consecutively, the amount of cells undergoing apoptosis, steadily increased at zinc aspartate concentrations exceeding 100 µM. Taken together, our findings suggest that zinc aspartate impairs T cell fitness and might be beneficial for the treatment of T cell-mediated autoimmune diseases.
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Gurgel Penaforte-Saboia J, Couri CEB, Vasconcelos Albuquerque N, Lauanna Lima Silva V, Bitar da Cunha Olegario N, Oliveira Fernandes V, Montenegro Junior RM. Emerging Roles of Dipeptidyl Peptidase-4 Inhibitors in Delaying the Progression of Type 1 Diabetes Mellitus. Diabetes Metab Syndr Obes 2021; 14:565-573. [PMID: 33603422 PMCID: PMC7882449 DOI: 10.2147/dmso.s294742] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 01/26/2021] [Indexed: 12/17/2022] Open
Abstract
Type 1 diabetes mellitus (T1DM) results from the immune cell-mediated destruction of functional pancreatic β-cells. In the presymptomatic period, T1DM is characterized by the presence of two or more autoantibodies against the islet cells in patients without glycemic decompensation. Therapeutic strategies that can modify the autoimmune process could slow the progression of T1DM. Dipeptidyl peptidase-4 (DPP-4) or CD26, a multifunctional serine protease with a dual function (regulatory protease and binding protein), can modulate inflammation and immune cell-mediated β-cell destruction. CD26 is involved in T-cell co-stimulation, migration, memory development, thymic maturation, and emigration patterns. DPP-4 degrades the peptide hormones GLP-1 and GIP. In addition to regulating glucose metabolism, DPP-4 exerts anti-apoptotic, regenerative, and proliferative effects to promote β-cell mass expansion. GLP-1 receptor signaling may regulate murine lymphocyte proliferation and maintenance of peripheral regulatory T-cells. In patients with T1DM, the serum DPP-4 activity is upregulated. Several studies have suggested that the upregulated DPP-4 activity is correlated with T1DM pathophysiology. DPP-4, which is preferentially expressed on the Th1 surface, can promote the polarization of Th1 immunity, a prerequisite for T1DM development. CD26 inhibition can suppress T-cell proliferation and Th1 cytokine production and stimulate tumor growth factor beta-1 (TGF-β1) secretion, which plays an important role in the regulation of autoimmunity in T1DM. Studies on humans or animal models of T1DM have suggested that DPP-4 inhibitors can improve β-cell function and attenuate autoimmunity in addition to decreasing insulin dependence. This review summarizes the emerging roles of DPP-4 inhibitors in potentially delaying the progression of T1DM.
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Affiliation(s)
- Jaquellyne Gurgel Penaforte-Saboia
- Clinical Research Unit, Walter Cantidio University Hospital, Federal University of Ceará, Fortaleza, Brazil
- Department of Clinical Medicine, Federal University of Ceará, Fortaleza, Brazil
| | - Carlos Eduardo Barra Couri
- Center for Cell-Based Therapy, Ribeirão Preto Medical School, University of São Paulo, São Paulo, Brazil
| | - Natasha Vasconcelos Albuquerque
- Clinical Research Unit, Walter Cantidio University Hospital, Federal University of Ceará, Fortaleza, Brazil
- Department of Community Health, Federal University of Ceará, Fortaleza, Brazil
| | | | - Natália Bitar da Cunha Olegario
- Clinical Research Unit, Walter Cantidio University Hospital, Federal University of Ceará, Fortaleza, Brazil
- Department of Clinical Medicine, Federal University of Ceará, Fortaleza, Brazil
| | - Virgínia Oliveira Fernandes
- Clinical Research Unit, Walter Cantidio University Hospital, Federal University of Ceará, Fortaleza, Brazil
- Department of Clinical Medicine, Federal University of Ceará, Fortaleza, Brazil
- Department of Community Health, Federal University of Ceará, Fortaleza, Brazil
| | - Renan Magalhães Montenegro Junior
- Clinical Research Unit, Walter Cantidio University Hospital, Federal University of Ceará, Fortaleza, Brazil
- Department of Clinical Medicine, Federal University of Ceará, Fortaleza, Brazil
- Department of Community Health, Federal University of Ceará, Fortaleza, Brazil
- Correspondence: Renan Magalhães Montenegro Junior Federal University of Ceará, Rua Coronel Nunes de Melo s/n, Fortaleza, 60430-270, Ceará, BrazilTel +55 8533668600Fax +55 85 3366-8619 Email
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Nieto-Fontarigo JJ, González-Barcala FJ, San José E, Arias P, Nogueira M, Salgado FJ. CD26 and Asthma: a Comprehensive Review. Clin Rev Allergy Immunol 2019; 56:139-160. [PMID: 27561663 PMCID: PMC7090975 DOI: 10.1007/s12016-016-8578-z] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Asthma is a heterogeneous and chronic inflammatory family of disorders of the airways with increasing prevalence that results in recurrent and reversible bronchial obstruction and expiratory airflow limitation. These diseases arise from the interaction between environmental and genetic factors, which collaborate to cause increased susceptibility and severity. Many asthma susceptibility genes are linked to the immune system or encode enzymes like metalloproteases (e.g., ADAM-33) or serine proteases. The S9 family of serine proteases (prolyl oligopeptidases) is capable to process peptide bonds adjacent to proline, a kind of cleavage-resistant peptide bonds present in many growth factors, chemokines or cytokines that are important for asthma. Curiously, two serine proteases within the S9 family encoded by genes located on chromosome 2 appear to have a role in asthma: CD26/dipeptidyl peptidase 4 (DPP4) and DPP10. The aim of this review is to summarize the current knowledge about CD26 and to provide a structured overview of the numerous functions and implications that this versatile enzyme could have in this disease, especially after the detection of some secondary effects (e.g., viral nasopharyngitis) in type II diabetes mellitus patients (a subset with a certain risk of developing obesity-related asthma) upon CD26 inhibitory therapy.
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Affiliation(s)
- Juan J Nieto-Fontarigo
- Department of Biochemistry and Molecular Biology, Faculty of Biology-Biological Research Centre (CIBUS), University of Santiago de Compostela (USC), Santiago de Compostela, Spain
| | - Francisco J González-Barcala
- Department of Biochemistry and Molecular Biology, Faculty of Biology-Biological Research Centre (CIBUS), University of Santiago de Compostela (USC), Santiago de Compostela, Spain
- Respiratory Department, Clinic University Hospital (CHUS), Santiago de Compostela, Spain
| | - Esther San José
- Clinical Analysis Service, Clinic University Hospital (CHUS), Santiago de Compostela, Spain
| | - Pilar Arias
- Department of Biochemistry and Molecular Biology, Faculty of Biology-Biological Research Centre (CIBUS), University of Santiago de Compostela (USC), Santiago de Compostela, Spain
| | - Montserrat Nogueira
- Department of Biochemistry and Molecular Biology, Faculty of Biology-Biological Research Centre (CIBUS), University of Santiago de Compostela (USC), Santiago de Compostela, Spain
| | - Francisco J Salgado
- Department of Biochemistry and Molecular Biology, Faculty of Biology-Biological Research Centre (CIBUS), University of Santiago de Compostela (USC), Santiago de Compostela, Spain.
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Gaudin O, Seta V, Alexandre M, Bohelay G, Aucouturier F, Mignot-Grootenboer S, Ingen-Housz-Oro S, Bernardeschi C, Schneider P, Mellottee B, Caux F, Prost-Squarcioni C. Gliptin Accountability in Mucous Membrane Pemphigoid Induction in 24 Out of 313 Patients. Front Immunol 2018; 9:1030. [PMID: 29881377 PMCID: PMC5976795 DOI: 10.3389/fimmu.2018.01030] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 04/24/2018] [Indexed: 01/27/2023] Open
Abstract
Mucous membrane pemphigoids (MMPs) and bullous pemphigoid (BP) are autoimmune bullous diseases that share physiopathological features: both can result from autoantibodies directed against BP180 or BP230 antigens. An association has been reported between BP and intake of gliptins, which are dipeptidyl peptidase-IV inhibitors used to treat type 2 diabetes mellitus. Clinical and immunological differences have been reported between gliptin-induced BPs and classical BPs: mucosal involvement, non-inflammatory lesions, and target BP180 epitopes other than the NC16A domain. Those findings accorded gliptins extrinsic accountability in triggering MMP onset. Therefore, we examined gliptin intrinsic accountability in a cohort of 313 MMP patients. To do so, we (1) identified MMP patients with gliptin-treated (challenge) diabetes; (2) selected those whose interval between starting gliptin and MMP onset was suggestive or compatible with gliptin-induced MMP; (3) compared the follow-ups of patients who did not stop (no dechallenge), stopped (dechallenge) or repeated gliptin intake (rechallenge); (4) compared the clinical and immunological characteristics of suggestive-or-compatible-challenge patients to 121 never-gliptin-treated MMP patients serving as controls; and (5) individually scored gliptin accountability as the trigger of each patient's MMP using the World Health Organization-Uppsala Monitoring Center, Naranjo- and Begaud-scoring systems. 17 out of 24 gliptin-treated diabetic MMP patients had suggestive (≤12 weeks) or compatible challenges. Complete remission at 1 year of follow-up was more frequent in the 11 dechallenged patients. One rechallenged patient's MMP relapsed. These 17 gliptin-treated diabetic MMP patients differed significantly from the MMP controls by more cutaneous, less buccal, and less severe involvements and no direct immunofluorescence IgA labeling of the basement membrane zone. Multiple autoantibody-target antigens/epitopes (BP180-NC16A, BP180 mid- and C-terminal parts, integrin α6β4) could be detected, but not laminin 332. Last, among the 24 gliptin-treated diabetic MMP patients, five had high (I4-I3), 12 had low (I2-I1) and 7 had I0 Begaud intrinsic accountability scores. These results strongly suggest that gliptins are probably responsible for some MMPs. Consequently, gliptins should immediately be discontinued for patients with a positive accountability score. Moreover, pharmacovigilance centers should be notified of these events.
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Affiliation(s)
- Olivier Gaudin
- Department of Dermatology, Referral Center for Autoimmune Bullous Diseases (MALIBUL), Avicenne Hospital, Assistance Publique Hôpitaux De Paris (AP-HP), Paris 13 University, Bobigny, France
| | - Vannina Seta
- Department of Dermatology, Referral Center for Autoimmune Bullous Diseases (MALIBUL), Avicenne Hospital, Assistance Publique Hôpitaux De Paris (AP-HP), Paris 13 University, Bobigny, France
- Department of Dermatology, Referral Center for Autoimmune Bullous Diseases (MALIBUL), Cochin Hospital, Assistance Publique Hôpitaux De Paris (AP-HP), Université Paris Descartes, Paris, France
| | - Marina Alexandre
- Department of Dermatology, Referral Center for Autoimmune Bullous Diseases (MALIBUL), Avicenne Hospital, Assistance Publique Hôpitaux De Paris (AP-HP), Paris 13 University, Bobigny, France
| | - Gérôme Bohelay
- Department of Dermatology, Referral Center for Autoimmune Bullous Diseases (MALIBUL), Avicenne Hospital, Assistance Publique Hôpitaux De Paris (AP-HP), Paris 13 University, Bobigny, France
| | - Françoise Aucouturier
- Department of Immunology, Referral Center for Autoimmune Bullous Diseases (MALIBUL), Saint-Louis Hospital, Assistance Publique Hôpitaux De Paris (AP-HP), Paris, France
| | - Sabine Mignot-Grootenboer
- Department of Immunology, Referral Center for Autoimmune Bullous Diseases (MALIBUL), Bichat Hospital, Assistance Publique Hôpitaux De Paris (AP-HP), Paris, France
| | - Saskia Ingen-Housz-Oro
- Department of Dermatology, Referral Center for Autoimmune Bullous Diseases (MALIBUL), Henri-Mondor Hospital, Assistance Publique Hôpitaux De Paris (AP-HP), Créteil, France
| | - Céline Bernardeschi
- Department of Dermatology, Referral Center for Autoimmune Bullous Diseases (MALIBUL), Cochin Hospital, Assistance Publique Hôpitaux De Paris (AP-HP), Université Paris Descartes, Paris, France
| | - Pierre Schneider
- Department of Dermatology, Referral Center for Autoimmune Bullous Diseases (MALIBUL), Saint-Louis Hospital, Assistance Publique Hôpitaux De Paris (AP-HP), Paris, France
| | - Benoît Mellottee
- Department of Dermatology, Referral Center for Autoimmune Bullous Diseases (MALIBUL), Avicenne Hospital, Assistance Publique Hôpitaux De Paris (AP-HP), Paris 13 University, Bobigny, France
| | - Frédéric Caux
- Department of Dermatology, Referral Center for Autoimmune Bullous Diseases (MALIBUL), Avicenne Hospital, Assistance Publique Hôpitaux De Paris (AP-HP), Paris 13 University, Bobigny, France
| | - Catherine Prost-Squarcioni
- Department of Dermatology, Referral Center for Autoimmune Bullous Diseases (MALIBUL), Avicenne Hospital, Assistance Publique Hôpitaux De Paris (AP-HP), Paris 13 University, Bobigny, France
- Department of Histology, UFR Léonard de Vinci, Paris 13 University, Bobigny, France
- Department of Pathology, Avicenne Hospital, Assistance Publique Hôpitaux De Paris (AP-HP), Paris 13 University, Bobigny, France
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11
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Kim M, von Muenchow L, Le Meur T, Kueng B, Gapp B, Weber D, Dietrich W, Kovarik J, Rolink AG, Ksiazek I. DPP9 enzymatic activity in hematopoietic cells is dispensable for mouse hematopoiesis. Immunol Lett 2018; 198:60-65. [PMID: 29709545 DOI: 10.1016/j.imlet.2018.04.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 03/09/2018] [Accepted: 04/25/2018] [Indexed: 02/07/2023]
Abstract
Dipeptidyl peptidase 9 (DPP9) is a ubiquitously expressed intracellular prolyl peptidase implicated in immunoregulation. However, its physiological relevance in the immune system remains largely unknown. We investigated the role of DPP9 enzyme in immune system by characterizing DPP9 knock-in mice expressing a catalytically inactive S729A mutant of DPP9 enzyme (DPP9ki/ki mice). DPP9ki/ki mice show reduced number of lymphoid and myeloid cells in fetal liver and postnatal blood but their hematopoietic cells are fully functional and able to reconstitute lymphoid and myeloid lineages even in competitive mixed chimeras. These studies demonstrate that inactivation of DPP9 enzymatic activity does not lead to any perturbations in mouse hematopoiesis.
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Affiliation(s)
- Munkyung Kim
- Novartis Institute for Biomedical Research, CH-4056, Basel, Switzerland
| | - Lilly von Muenchow
- Developmental and Molecular Immunology, Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Thomas Le Meur
- Novartis Institute for Biomedical Research, CH-4056, Basel, Switzerland
| | - Benjamin Kueng
- Novartis Institute for Biomedical Research, CH-4056, Basel, Switzerland
| | - Berangere Gapp
- Novartis Institute for Biomedical Research, CH-4056, Basel, Switzerland
| | - Delphine Weber
- Novartis Institute for Biomedical Research, CH-4056, Basel, Switzerland
| | | | - Jiri Kovarik
- Novartis Institute for Biomedical Research, CH-4056, Basel, Switzerland
| | - Antonius G Rolink
- Developmental and Molecular Immunology, Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Iwona Ksiazek
- Novartis Institute for Biomedical Research, CH-4056, Basel, Switzerland.
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12
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Chalichem NSS, Gonugunta C, Krishnamurthy PT, Duraiswamy B. DPP4 Inhibitors Can Be a Drug of Choice for Type 3 Diabetes: A Mini Review. Am J Alzheimers Dis Other Demen 2017; 32:444-451. [PMID: 28747063 PMCID: PMC10852729 DOI: 10.1177/1533317517722005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
As well known to the scientific community, Alzheimer's disease (AD) is an irreversible neurodegenerative disease that ends up with impairment of memory and cognition due to neuronal and synapse loss. Patient's quality of life can be enhanced by targeting neurogenesis as a therapeutic paradigm. Moreover, several research evidences support the concept that AD is a type of metabolic disorder mediated by impairment in brain insulin responsiveness and energy metabolism. Growing evidence suggests that endogenous peptides such as glucagon-like peptide-1 (GLP-1) and stromal-derived factor-1α (SDF-1α) provide neuroprotection across a range of experimental models of AD. So, preserving functional activity of SDF-1α and GLP-1 by dipeptidyl peptidase-4 inhibition will enhance the homing/recruitment of brain resident and nonresident circulating stem cells/progenitor cells, a noninvasive approach for promoting neurogenesis. So, herewith we provide this in support of dipeptidyl peptidase-4 inhibitors as a new target of attention for treating AD.
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Affiliation(s)
- Nehru Sai Suresh Chalichem
- Department of Pharmacognosy and Phytopharmacy, JSS College of Pharmacy, (Constituent College of Jagadguru Sri Shivarathreeswara University, Mysuru), Ooty, India
| | - Chaitanya Gonugunta
- Department of Pharmacology, Guntur Medical College, Guntur, Andhra Pradesh, India
| | - Praveen Thaggikuppe Krishnamurthy
- Department of Pharmacology, JSS College of Pharmacy, (Constituent College of Jagadguru Sri Shivarathreeswara University, Mysuru), Ooty, India
| | - Basavan Duraiswamy
- Department of Pharmacognosy and Phytopharmacy, JSS College of Pharmacy, (Constituent College of Jagadguru Sri Shivarathreeswara University, Mysuru), Ooty, India
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13
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Miglio G, Vitarelli G, Klein T, Benetti E. Effects of linagliptin on human immortalized podocytes: a cellular system to study dipeptidyl-peptidase 4 inhibition. Br J Pharmacol 2017; 174:809-821. [PMID: 28177527 DOI: 10.1111/bph.13739] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Revised: 01/19/2017] [Accepted: 01/22/2017] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND AND PURPOSE Dipeptidyl-peptidase 4 (DPP4) is expressed by resident renal cells, including glomerular cells. DPP4 inhibitors (gliptins) exert albuminuria lowering effects, but the role of renal DPP4 as a pharmacological target has not been elucidated. To better understand the actions of gliptins, the effects of linagliptin on the behaviour of immortalized human podocytes and mesangial cells were evaluated. EXPERIMENTAL APPROACH The expression of DPP4 was measured at both the mRNA and protein levels. The effects of linagliptin on DPP4 activity, cell growth and cell cycle progression were determined. The contribution of the stromal cell-derived factor-1- CXCR4/CXCR7 signalling pathways was evaluated by studying the effects of AMD3100 (a CXCR4 antagonist and CXCR7 agonist) alone and in combination with linagliptin. The contribution of ERK1/2 activation was analysed by studying the effects of the MAPK kinase 1/2 inhibitor AZD6244. KEY RESULTS DPP4 was highly expressed in podocytes. The activity of DPP4 and podocyte growth were reduced by linagliptin. The effects of sitagliptin on podocyte growth were similar to those of linagliptin, were associated with inhibition of cell proliferation and mimicked by AMD3100. Moreover, linagliptin and AMD3100 were found to have a synergistic interaction, whereas no interaction was seen between linagliptin and AZD6244. CONCLUSIONS AND IMPLICATIONS Our cultures of human glomerular cells represent a reliable system for investigating the actions of gliptins. Moreover, DPP4 contributes to the regulation of podocyte behaviour. Inhibition of DPP4 in podocytes could underlie the effects of linagliptin on glomerular cells.
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Affiliation(s)
- Gianluca Miglio
- Dipartimento di Scienza e Tecnologia del Farmaco, Università degli Studi di Torino, Turin, Italy
| | - Giovanna Vitarelli
- Dipartimento di Scienza e Tecnologia del Farmaco, Università degli Studi di Torino, Turin, Italy
| | - Thomas Klein
- Department of Cardio Metabolic Diseases Research, Boehringer Ingelheim Pharma GmbH & Co. KG, Biberach, Germany
| | - Elisa Benetti
- Dipartimento di Scienza e Tecnologia del Farmaco, Università degli Studi di Torino, Turin, Italy
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14
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Zietek T, Rath E. Inflammation Meets Metabolic Disease: Gut Feeling Mediated by GLP-1. Front Immunol 2016; 7:154. [PMID: 27148273 PMCID: PMC4840214 DOI: 10.3389/fimmu.2016.00154] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 04/08/2016] [Indexed: 12/14/2022] Open
Abstract
Chronic diseases, such as obesity and diabetes, cardiovascular, and inflammatory bowel diseases (IBD) share common features in their pathology. Metabolic disorders exhibit strong inflammatory underpinnings and vice versa, inflammation is associated with metabolic alterations. Next to cytokines and cellular stress pathways, such as the unfolded protein response (UPR), alterations in the enteroendocrine system are intersections of various pathologies. Enteroendocrine cells (EEC) have been studied extensively for their ability to regulate gastrointestinal motility, secretion, and insulin release by release of peptide hormones. In particular, the L-cell-derived incretin hormone glucagon-like peptide 1 (GLP-1) has gained enormous attention due to its insulinotropic action and relevance in the treatment of type 2 diabetes (T2D). Yet, accumulating data indicate a critical role for EEC and in particular for GLP-1 in metabolic adaptation and in orchestrating immune responses beyond blood glucose control. EEC sense the lamina propria and luminal environment, including the microbiota via receptors and transporters. Subsequently, mediating signals by secreting hormones and cytokines, EEC can be considered as integrators of metabolic and inflammatory signaling. This review focuses on L cell and GLP-1 functions in the context of metabolic and inflammatory diseases. The effects of incretin-based therapies on metabolism and immune system are discussed and the interrelation and common features of metabolic and immune-mediated disorders are highlighted. Moreover, it presents data on the impact of inflammation, in particular of IBD on EEC and discusses the potential role of the microbiota as link between nutrients, metabolism, immunity, and disease.
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Affiliation(s)
- Tamara Zietek
- Department of Nutritional Physiology, Technische Universität München , Freising , Germany
| | - Eva Rath
- Chair of Nutrition and Immunology, Technische Universität München , Freising , Germany
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15
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Ferretti C, La Cava A. Adaptive immune regulation in autoimmune diabetes. Autoimmun Rev 2016; 15:236-41. [DOI: 10.1016/j.autrev.2015.11.008] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2015] [Accepted: 11/19/2015] [Indexed: 12/16/2022]
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16
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Waumans Y, Baerts L, Kehoe K, Lambeir AM, De Meester I. The Dipeptidyl Peptidase Family, Prolyl Oligopeptidase, and Prolyl Carboxypeptidase in the Immune System and Inflammatory Disease, Including Atherosclerosis. Front Immunol 2015; 6:387. [PMID: 26300881 PMCID: PMC4528296 DOI: 10.3389/fimmu.2015.00387] [Citation(s) in RCA: 122] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Accepted: 07/13/2015] [Indexed: 12/19/2022] Open
Abstract
Research from over the past 20 years has implicated dipeptidyl peptidase (DPP) IV and its family members in many processes and different pathologies of the immune system. Most research has been focused on either DPPIV or just a few of its family members. It is, however, essential to consider the entire DPP family when discussing any one of its members. There is a substantial overlap between family members in their substrate specificity, inhibitors, and functions. In this review, we provide a comprehensive discussion on the role of prolyl-specific peptidases DPPIV, FAP, DPP8, DPP9, dipeptidyl peptidase II, prolyl carboxypeptidase, and prolyl oligopeptidase in the immune system and its diseases. We highlight possible therapeutic targets for the prevention and treatment of atherosclerosis, a condition that lies at the frontier between inflammation and cardiovascular disease.
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Affiliation(s)
- Yannick Waumans
- Laboratory of Medical Biochemistry, Department of Pharmaceutical Sciences, University of Antwerp , Antwerp , Belgium
| | - Lesley Baerts
- Laboratory of Medical Biochemistry, Department of Pharmaceutical Sciences, University of Antwerp , Antwerp , Belgium
| | - Kaat Kehoe
- Laboratory of Medical Biochemistry, Department of Pharmaceutical Sciences, University of Antwerp , Antwerp , Belgium
| | - Anne-Marie Lambeir
- Laboratory of Medical Biochemistry, Department of Pharmaceutical Sciences, University of Antwerp , Antwerp , Belgium
| | - Ingrid De Meester
- Laboratory of Medical Biochemistry, Department of Pharmaceutical Sciences, University of Antwerp , Antwerp , Belgium
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17
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Gong Q, Rajagopalan S, Zhong J. Dpp4 inhibition as a therapeutic strategy in cardiometabolic disease: Incretin-dependent and -independent function. Int J Cardiol 2015; 197:170-9. [PMID: 26142202 PMCID: PMC7114201 DOI: 10.1016/j.ijcard.2015.06.076] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2015] [Revised: 06/03/2015] [Accepted: 06/20/2015] [Indexed: 12/25/2022]
Abstract
Cardiometabolic disorders including obesity, diabetes and cardiovascular disease are among the most severe health problems worldwide. DPP4 enzymatic inhibitors were first developed as anti-diabetic reagents which preserve incretin hormones and promote post-prandial insulin secretion. It's been shown in animal studies that incretin-based therapy has a beneficial effect on cardiovascular disease. Recent studies demonstrated novel non-catalytic functions of DPP4 that may play a role in cardiometabolic disease. Although the role of DPP4 inhibition-mediated incretin effects has been well-reviewed, little information of its incretin-independent actions was introduced in cardiometabolic disease. In the current review, we will summarize the catalytic dependent and independent effects of DPP4 inhibition on cardiometabolic disease. Discuss the findings from recent large scale clinical trials (EXAMINE and SAVOR-TIMI 53) Summarize the catalytic dependent and independent effects of DPP4 inhibition on cardiometabolic disease Focus on recent evidence linking DPP4 inhibition therapy with cardiovascular disease Provide mechanistic insights into the cardiovascular effect of DPP4
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Affiliation(s)
- Quan Gong
- Department of Immunology, School of Medicine, Yangtze University, Jingzhou, Hubei 434023, PR China
| | - Sanjay Rajagopalan
- Division of Cardiovascular Medicine, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
| | - Jixin Zhong
- Department of Immunology, School of Medicine, Yangtze University, Jingzhou, Hubei 434023, PR China; Division of Cardiovascular Medicine, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
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18
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Zhong J, Gong Q, Goud A, Srinivasamaharaj S, Rajagopalan S. Recent Advances in Dipeptidyl-Peptidase-4 Inhibition Therapy: Lessons from the Bench and Clinical Trials. J Diabetes Res 2015; 2015:606031. [PMID: 26075284 PMCID: PMC4446505 DOI: 10.1155/2015/606031] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Revised: 04/23/2015] [Accepted: 04/27/2015] [Indexed: 12/23/2022] Open
Abstract
DPP4 inhibitors (DPP4i) are a class of newly developed antidiabetic drugs which preserve incretin hormones and promote postprandial insulin secretion. Although the cardiovascular effect of DPP4 inhibition has been substantially studied, the exact role of DPP4 in cardiovascular disease especially in humans remains elusive. Previous small studies and meta-analyses have suggested a benefit in both surrogate outcomes and cardiovascular events for these agents. However, there was growing evidence in recent years questioning the cardioprotective effect of DPP4i. Further, a signal of heart failure hospitalization in a recent large scale clinical trial SAVOR-TIMI 53 has called into question the safety of these agents and their utility in the treatment of cardiovascular disease. In this review, we will revisit the physiologic function of DPP4 and discuss its role in cardiometabolic disease based on recent experimental and clinical studies.
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Affiliation(s)
- Jixin Zhong
- Department of Immunology, School of Medicine, Yangtze University, Jingzhou, Hubei 434023, China
- Division of Cardiovascular Medicine, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Quan Gong
- Department of Immunology, School of Medicine, Yangtze University, Jingzhou, Hubei 434023, China
| | - Aditya Goud
- Division of Cardiovascular Medicine, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Srividya Srinivasamaharaj
- Division of Cardiovascular Medicine, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Sanjay Rajagopalan
- Division of Cardiovascular Medicine, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA
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19
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Dingenouts CKE, Goumans MJ, Bakker W. Mononuclear cells and vascular repair in HHT. Front Genet 2015; 6:114. [PMID: 25852751 PMCID: PMC4369645 DOI: 10.3389/fgene.2015.00114] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Accepted: 03/05/2015] [Indexed: 12/31/2022] Open
Abstract
Hereditary hemorrhagic telangiectasia (HHT) or Rendu–Osler–Weber disease is a rare genetic vascular disorder known for its endothelial dysplasia causing arteriovenous malformations and severe bleedings. HHT-1 and HHT-2 are the most prevalent variants and are caused by heterozygous mutations in endoglin and activin receptor-like kinase 1, respectively. An undervalued aspect of the disease is that HHT patients experience persistent inflammation. Although endothelial and mural cells have been the main research focus trying to unravel the mechanism behind the disease, wound healing is a process with a delicate balance between inflammatory and vascular cells. Inflammatory cells are part of the mononuclear cells (MNCs) fraction, and can, next to eliciting an immune response, also have angiogenic potential. This biphasic effect of MNC can hold a promising mechanism to further elucidate treatment strategies for HHT patients. Before MNC are able to contribute to repair, they need to home to and retain in ischemic and damaged tissue. Directed migration (homing) of MNCs following tissue damage is regulated by the stromal cell derived factor 1 (SDF1). MNCs that express the C-X-C chemokine receptor 4 (CXCR4) migrate toward the tightly regulated gradient of SDF1. This directed migration of monocytes and lymphocytes can be inhibited by dipeptidyl peptidase 4 (DPP4). Interestingly, MNC of HHT patients express elevated levels of DPP4 and show impaired homing toward damaged tissue. Impaired homing capacity of the MNCs might therefore contribute to the impaired angiogenesis and tissue repair observed in HHT patients. This review summarizes recent studies regarding the role of MNCs in the etiology of HHT and vascular repair, and evaluates the efficacy of DPP4 inhibition in tissue integrity and repair.
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Affiliation(s)
- Calinda K E Dingenouts
- Department of Molecular Cell Biology, Leiden University Medical Center Leiden, Netherlands
| | - Marie-José Goumans
- Department of Molecular Cell Biology, Leiden University Medical Center Leiden, Netherlands
| | - Wineke Bakker
- Department of Molecular Cell Biology, Leiden University Medical Center Leiden, Netherlands
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20
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Hatano R, Ohnuma K, Otsuka H, Komiya E, Taki I, Iwata S, Dang NH, Okumura K, Morimoto C. CD26-mediated induction of EGR2 and IL-10 as potential regulatory mechanism for CD26 costimulatory pathway. THE JOURNAL OF IMMUNOLOGY 2014; 194:960-72. [PMID: 25548232 DOI: 10.4049/jimmunol.1402143] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
CD26 is associated with T cell signal transduction processes as a costimulatory molecule, and CD26(+) T cells have been suggested to be involved in the pathophysiology of diverse autoimmune diseases. Although the cellular and molecular mechanisms involved in CD26-mediated T cell activation have been extensively evaluated by our group and others, potential negative feedback mechanisms to regulate CD26-mediated activation still remain to be elucidated. In the present study, we examine the expression of inhibitory molecules induced via CD26-mediated costimulation. We show that coengagement of CD3 and CD26 induces preferential production of IL-10 in human CD4(+) T cells, mediated through NFAT and Raf-MEK-ERK pathways. A high level of early growth response 2 (EGR2) is also induced following CD26 costimulation, possibly via NFAT and AP-1-mediated signaling, and knockdown of EGR2 leads to decreased IL-10 production. Furthermore, CD3/CD26-stimulated CD4(+) T cells clearly suppress proliferative activity and effector cytokine production of bystander T cells in an IL-10-dependent manner. Taken together, our data suggest that robust CD26 costimulatory signaling induces preferential expression of EGR2 and IL-10 as a potential mechanism for regulating CD26-mediated activation.
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Affiliation(s)
- Ryo Hatano
- Department of Therapy Development and Innovation for Immune Disorders and Cancers, Graduate School of Medicine, Juntendo University, Tokyo 113-8421, Japan; Atopy (Allergy) Research Center, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan; and
| | - Kei Ohnuma
- Department of Therapy Development and Innovation for Immune Disorders and Cancers, Graduate School of Medicine, Juntendo University, Tokyo 113-8421, Japan
| | - Haruna Otsuka
- Department of Therapy Development and Innovation for Immune Disorders and Cancers, Graduate School of Medicine, Juntendo University, Tokyo 113-8421, Japan
| | - Eriko Komiya
- Department of Therapy Development and Innovation for Immune Disorders and Cancers, Graduate School of Medicine, Juntendo University, Tokyo 113-8421, Japan
| | - Izumi Taki
- Department of Therapy Development and Innovation for Immune Disorders and Cancers, Graduate School of Medicine, Juntendo University, Tokyo 113-8421, Japan
| | - Satoshi Iwata
- Department of Therapy Development and Innovation for Immune Disorders and Cancers, Graduate School of Medicine, Juntendo University, Tokyo 113-8421, Japan
| | - Nam H Dang
- Division of Hematology/Oncology, University of Florida, Gainesville, FL 32610
| | - Ko Okumura
- Atopy (Allergy) Research Center, Juntendo University Graduate School of Medicine, Tokyo 113-8421, Japan; and
| | - Chikao Morimoto
- Department of Therapy Development and Innovation for Immune Disorders and Cancers, Graduate School of Medicine, Juntendo University, Tokyo 113-8421, Japan;
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21
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Zhao Y, Yang L, Wang X, Zhou Z. The new insights from DPP-4 inhibitors: their potential immune modulatory function in autoimmune diabetes. Diabetes Metab Res Rev 2014; 30:646-53. [PMID: 24446278 DOI: 10.1002/dmrr.2530] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Revised: 12/26/2013] [Accepted: 01/04/2014] [Indexed: 12/12/2022]
Abstract
Dipeptidyl peptidase-4 (DPP-4) inhibitors are a new class of anti-diabetic agents that are widely used in clinical practice to improve glycemic control and protect β-cell function in patients with type 2 diabetes. DPP-4 is also known as lymphocyte cell surface protein CD26 and plays an important role in T-cell immunity. Autoimmune diabetes, a T-cell mediated organ-specific disease, is initiated by the imbalance between pathogenic and regulatory T-lymphocytes. DPP-4 inhibitors can suppress pathogenic effects of Th1 and Th17 cells and up-regulate Th2 cells and regulatory T cells, which play a critical role in ameliorating autoimmune diabetes. This provides a basis for the potential use of DPP-4 inhibitors in the treatment of autoimmune diabetes. Recent studies suggest that DPP-4 inhibitors improve β-cell function and attenuate autoimmunity in type 1 diabetic mouse models. However, there are few clinical studies on the treatment of autoimmune diabetes with DPP-4 inhibitors. Further studies are warranted to confirm the therapeutic effects of DPP-4 inhibitors on autoimmune diabetes in humans.
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Affiliation(s)
- Yunjuan Zhao
- Diabetes Center, Institute of Metabolism and Endocrinology, The Second Xiangya Hospital and Key Laboratory of Diabetes Immunology, Ministry of Education, Central South University, Changsha, China
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van Poppel PCM, Gresnigt MS, Smits P, Netea MG, Tack CJ. The dipeptidyl peptidase-4 inhibitor vildagliptin does not affect ex vivo cytokine response and lymphocyte function in patients with type 2 diabetes mellitus. Diabetes Res Clin Pract 2014; 103:395-401. [PMID: 24485397 DOI: 10.1016/j.diabres.2013.12.039] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Revised: 10/30/2013] [Accepted: 12/19/2013] [Indexed: 12/17/2022]
Abstract
AIMS The enzyme dipeptidyl peptidase-4 (DPP-4) is a key player in the degradation of incretin hormones that are involved in glucose metabolism. DPP-4 is also expressed on immune cells and is associated with several immunological functions. Some studies have reported increased rates of infections in patients treated with DPP-4 inhibitors. We therefore assessed whether treatment with the DPP-4 inhibitor vildagliptin affected cytokine production and T-cell differentiation. METHODS Patients with type 2 diabetes were treated with vildagliptin or an active comparator, acarbose, for four weeks, in a randomized cross-over trial. Blood was sampled at the end of each treatment period and peripheral blood mononuclear cells were isolated and stimulated with a broad spectrum of pattern recognition receptor agonists. RESULTS Serum cytokine concentrations and ex vivo cytokine production (both monocyte and T-cell derived) did not differ during treatment with vildagliptin compared to acarbose. Similarly, ex vivo relative upregulation of mRNA transcription of T-cell lineage specific transcription factors was unaffected by vildagliptin treatment. CONCLUSIONS These data show that a four-week treatment with vildagliptin in patients with type 2 diabetes mellitus does not result in a significant modulation of cytokine responses. This observation suggests that inhibition of DDP-4 does not lead to an increased risk of infection by diminishing cytokine production.
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Affiliation(s)
- P C M van Poppel
- Department of Internal Medicine, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
| | - M S Gresnigt
- Department of Internal Medicine, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands; Nijmegen Institute for Infection, Inflammation and Immunity (N4i), Nijmegen, The Netherlands
| | - P Smits
- Department of Internal Medicine, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands; Department of Pharmacology and Toxicology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - M G Netea
- Department of Internal Medicine, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands; Nijmegen Institute for Infection, Inflammation and Immunity (N4i), Nijmegen, The Netherlands
| | - C J Tack
- Department of Internal Medicine, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
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Wex T, Grungreiff K, Schutte K, Stengritt M, Reinhold D. Expression analysis of zinc transporters in resting and stimulated human peripheral blood mononuclear cells. Biomed Rep 2014; 2:217-222. [PMID: 24649099 DOI: 10.3892/br.2014.219] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2013] [Accepted: 01/07/2014] [Indexed: 12/21/2022] Open
Abstract
Intracellular zinc homeostasis is tightly regulated under physiological conditions; however, dysregulation of zinc levels has been reported in various chronic inflammatory and malignant diseases. In this study, we aimed to assess the expression pattern of the 24 currently known zinc transporters in resting and stimulated human peripheral blood mononuclear cells (PBMCs). The cells were isolated from healthy probands and subsequently stimulated with phytohaemagglutinin (PHA) for 3 days. The expression levels of zinc transporters [Zrt/IRT-like protein (ZIP) and cation diffusion facilitator/zinc transporter protein (CDF/ZnT) families] were analyzed by quantitative reverse transcription-polymerase chain reaction. Of the 24 genes encoding for zinc transporters, 19 were found to be ubiquitously expressed in PBMCs. ZIP5 and ZnT10 were not found in all 5 samples, whereas ZIP12, ZnT3 and ZIP2 were expressed in only 1-2 out of 5 PBMC samples. Of note, stimulation by PHA led to an overall downregulation of zinc transporters in the PBMCs of 4 out of the 5 subjects. Notably, the transcript levels of ZIP14 were consistently induced and those of ZIP3 and ZIP4 consistently downregulated in all 5 subjects, whereas the corresponding levels of the remaining 21 genes varied. Data from this study may facilitate a better understanding of the pathophysiological role of deregulated zinc transporters in chronic inflammatory diseases.
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Affiliation(s)
- Thomas Wex
- Medical Laboratory for Clinical Chemistry, Microbiology and Infectious Diseases, Department of Molecular Genetics, Otto von Guericke University, D-39120 Magdeburg, Germany ; Department of Gastroenterology, Hepatology and Infectious Diseases, Otto von Guericke University, D-39120 Magdeburg, Germany
| | - Kurt Grungreiff
- Practice of Hepatology, Otto von Guericke University, D-39120 Magdeburg, Germany
| | - Kerstin Schutte
- Department of Gastroenterology, Hepatology and Infectious Diseases, Otto von Guericke University, D-39120 Magdeburg, Germany
| | - Maren Stengritt
- Department of Gastroenterology, Hepatology and Infectious Diseases, Otto von Guericke University, D-39120 Magdeburg, Germany
| | - Dirk Reinhold
- Institute of Molecular and Clinical Immunology, Otto von Guericke University, D-39120 Magdeburg, Germany
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24
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Zhao Y, Yang L, Zhou Z. Dipeptidyl peptidase-4 inhibitors: multitarget drugs, not only antidiabetes drugs. J Diabetes 2014; 6:21-9. [PMID: 23683065 DOI: 10.1111/1753-0407.12063] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2012] [Revised: 04/25/2013] [Accepted: 05/10/2013] [Indexed: 12/19/2022] Open
Abstract
Dipeptidyl peptidase (DPP)-4 inhibitors are a new class of antidiabetic agents that reduce blood glucose by preventing the degradation of the endogenous incretin hormones glucagon-like peptide-1 and glucose-dependent insulinotropic polypeptide. Protection by DPP-4 inhibitors of β-cell function has been demonstrated in patients with type 2 diabetes. Because DPP-4 is an enzyme widely expressed in humans, DPP-4 inhibitors are speculated to be multitarget agents. However, other potential therapeutic benefits of DPP-4 inhibitors remain unknown. Recently, some therapeutic effects of DPP-4 inhibitors, such as immune regulation, cardiovascular protection, and anti-inflammatory effects, have been observed. This article provides a systematic and comprehensive review of current research into the newly found effects and mechanism of action of DPP-4 inhibitors in a therapeutic context.
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Affiliation(s)
- Yunjuan Zhao
- Diabetes Center, Institute of Metabolism and Endocrinology, The Second Xiangya Hospital and Key Laboratory of Diabetes Immunology, Ministry of Education, Central South University, Changsha, China
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25
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Tejera-Alhambra M, Casrouge A, de Andrés C, Ramos-Medina R, Alonso B, Vega J, Albert ML, Sánchez-Ramón S. Low DPP4 expression and activity in multiple sclerosis. Clin Immunol 2013; 150:170-83. [PMID: 24412911 DOI: 10.1016/j.clim.2013.11.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Revised: 10/31/2013] [Accepted: 11/18/2013] [Indexed: 12/12/2022]
Abstract
Multiple sclerosis (MS) is a prototypic Th1/Th17 chronic autoimmune disease of the central nervous system. Dipeptidyl peptidase 4 (DPP4 or CD26) is a multifunctional molecule involved in autoimmune diseases' pathophysiology. We sought to integrate disparate pieces of data and analyze the plasma levels of sDPP4, DPP activity and DPP4 surface expression on T-cells in 129 MS patients with different clinical forms and 53 healthy controls, across two independent cohorts. Herein, we provide new evidence that sDPP4 concentration and DPP activity are significantly lower in MS patients than controls (p < 0.0001 and p < 0.01, respectively). In contrast, the frequency of circulating CD8(+)DPP4(hi) T-cells (p = 0.02) was increased in MS patients. This is the first study that simultaneously analyzes DPP4 expression and function in a large cohort of MS patients. Our data indicate a putative role for DPP4 in MS pathophysiology and suggest that a deeper understanding of surface versus shed DPP4 biology is warranted.
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Affiliation(s)
- Marta Tejera-Alhambra
- Department of Immunology, Hospital General Universitario Gregorio Marañón, Doctor Esquerdo 46, 28007 Madrid, Spain.
| | - Armanda Casrouge
- Centre d'Immunologie Humaine, Department of Immunology, Institut Pasteur, 25 Rue du Docteur Roux, 75724 Paris Cedex 15, France; INSERM U818, 25 Rue du Docteur Roux, 75724 Paris Cedex 15, France.
| | - Clara de Andrés
- Department of Neurology, Hospital General Universitario Gregorio Marañón, Doctor Esquerdo 46, 28007 Madrid, Spain.
| | - Rocío Ramos-Medina
- Department of Immunology, Hospital General Universitario Gregorio Marañón, Doctor Esquerdo 46, 28007 Madrid, Spain.
| | - Bárbara Alonso
- Department of Immunology, Hospital General Universitario Gregorio Marañón, Doctor Esquerdo 46, 28007 Madrid, Spain.
| | - Janet Vega
- Center Alicia Koplowitz for Multiple Sclerosis of the Community of Madrid, Bulevar de José Prat, 42, 28032 Madrid, Spain.
| | - Matthew L Albert
- Centre d'Immunologie Humaine, Department of Immunology, Institut Pasteur, 25 Rue du Docteur Roux, 75724 Paris Cedex 15, France; INSERM U818, 25 Rue du Docteur Roux, 75724 Paris Cedex 15, France.
| | - Silvia Sánchez-Ramón
- Department of Immunology, Hospital General Universitario Gregorio Marañón, Doctor Esquerdo 46, 28007 Madrid, Spain.
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26
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Cabrera SM, Colvin SC, Tersey SA, Maier B, Nadler JL, Mirmira RG. Effects of combination therapy with dipeptidyl peptidase-IV and histone deacetylase inhibitors in the non-obese diabetic mouse model of type 1 diabetes. Clin Exp Immunol 2013; 172:375-82. [PMID: 23600825 DOI: 10.1111/cei.12068] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/10/2013] [Indexed: 12/24/2022] Open
Abstract
Type 1 diabetes (T1D) results from T helper type 1 (Th1)-mediated autoimmune destruction of insulin-producing β cells. Novel experimental therapies for T1D target immunomodulation, β cell survival and inflammation. We examined combination therapy with the dipeptidyl peptidase-IV inhibitor MK-626 and the histone deacetylase inhibitor vorinostat in the non-obese diabetic (NOD) mouse model of T1D. We hypothesized that combination therapy would ameliorate T1D by providing protection from β cell inflammatory destruction while simultaneously shifting the immune response towards immune-tolerizing regulatory T cells (T(regs)). Although neither mono- nor combination therapies with MK-626 and vorinostat caused disease remission in diabetic NOD mice, the combination of MK-626 and vorinostat increased β cell area and reduced the mean insulitis score compared to diabetic control mice. In prediabetic NOD mice, MK-626 monotherapy resulted in improved glucose tolerance, a reduction in mean insulitis score and an increase in pancreatic lymph node T(reg) percentage, and combination therapy with MK-626 and vorinostat increased pancreatic lymph node T(reg) percentage. We conclude that neither single nor combination therapies using MK-626 and vorinostat induce diabetes remission in NOD mice, but combination therapy appears to have beneficial effects on β cell area, insulitis and T(reg) populations. Combinations of vorinostat and MK-626 may serve as beneficial adjunctive therapy in clinical trials for T1D prevention or remission.
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Affiliation(s)
- S M Cabrera
- Department of Pediatrics and the Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA
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27
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Cabrera SM, Rigby MR, Mirmira RG. Targeting regulatory T cells in the treatment of type 1 diabetes mellitus. Curr Mol Med 2012; 12:1261-72. [PMID: 22709273 PMCID: PMC3709459 DOI: 10.2174/156652412803833634] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2011] [Revised: 02/20/2012] [Accepted: 02/21/2012] [Indexed: 12/12/2022]
Abstract
Type 1 diabetes mellitus (T1DM) is a T cell-mediated autoimmune disease resulting in islet β cell destruction, hypoinsulinemia, and severely altered glucose homeostasis. T1DM has classically been attributed to the pathogenic actions of auto-reactive effector T cells(Teffs) on the β cell. Recent literature now suggests that a failure of a second T cell subtype, known as regulatory T cells (Tregs), plays a critical role in the development of T1DM. During immune homeostasis, Tregs counterbalance the actions of autoreactive Teff cells, thereby participating in peripheral tolerance. An imbalance in the activity between Teff and Tregs may be crucial in the breakdown of peripheral tolerance, leading to the development of T1DM. In this review, we summarize our current understanding of Treg function in health and in T1DM, and examine the effect of experimental therapies for T1DM on Treg cell number and function in both mice and humans.
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Affiliation(s)
- Susanne M. Cabrera
- Department of Pediatrics and the Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202
| | - Mark R. Rigby
- Department of Pediatrics and the Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202
| | - Raghavendra G. Mirmira
- Department of Pediatrics and the Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202
- Department of Medicine, Indiana University School of Medicine, Indianapolis, IN 46202
- Department of Cellular and Integrative Physiology, Indiana University School of Medicine, Indianapolis, IN 46202
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28
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Zhong J, Rao X, Rajagopalan S. An emerging role of dipeptidyl peptidase 4 (DPP4) beyond glucose control: potential implications in cardiovascular disease. Atherosclerosis 2012; 226:305-14. [PMID: 23083681 DOI: 10.1016/j.atherosclerosis.2012.09.012] [Citation(s) in RCA: 152] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Revised: 08/22/2012] [Accepted: 09/14/2012] [Indexed: 02/09/2023]
Abstract
The introduction of dipeptidyl peptidase 4 (DPP4) inhibitors for the treatment of Type 2 diabetes acknowledges the fundamental importance of incretin hormones in the regulation of glycemia. Small molecule inhibitors of DPP4 exert their effects via inhibition of enzymatic degradation of glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic peptide (GIP). The widespread expression of DPP4 in tissues such as the vasculature and immune cells suggests that this protein may play a role in cardiovascular function. DPP4 is known to exert its effects via both enzymatic and non-enzymatic mechanisms. A soluble form of DPP4 lacking the cytoplasmic and transmembrane domain has also been recently recognized. Besides enzymatic inactivation of incretins, DPP4 also mediates degradation of many chemokines and neuropeptides. The non-enzymatic function of DPP4 plays a critical role in providing co-stimulatory signals to T cells via adenosine deaminase (ADA). DPP4 may also regulate inflammatory responses in innate immune cells such as monocytes and dendritic cells. The multiplicity of functions and targets suggests that DPP4 may play a distinct role aside from its effects on the incretin axis. Indeed recent studies in experimental models of atherosclerosis provide evidence for a robust effect for these drugs in attenuating inflammation and plaque development. Several prospective randomized controlled clinical trials in humans with established atherosclerosis are testing the effects of DPP4 inhibition on hard cardiovascular events.
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Affiliation(s)
- Jixin Zhong
- Davis Heart and Lung Research Institute and Division of Cardiovascular Medicine, The Ohio State University, Columbus, OH, USA
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29
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Expression of TGFβ3 and its effects on migratory and invasive behavior of prostate cancer cells: involvement of PI3-kinase/AKT signaling pathway. Clin Exp Metastasis 2012; 30:13-23. [PMID: 22678424 DOI: 10.1007/s10585-012-9494-0] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2011] [Accepted: 05/27/2012] [Indexed: 12/17/2022]
Abstract
Transforming growth factor-β (TGFβ) is a secreted cytokine implicated as a factor in cancer cell migration and invasion. Previous studies have indicated that TGFβ isoforms may exert differential effects on cancer cells during different stages of the disease, however very little is known about the expression patterns and activity of the three isoforms in prostate cancer. Non-traditional signaling pathways including the PI3-Kinase have been associated with TGFβ-mediated effects on cancer cell invasion. In the present study, we have carried out expression analysis of TGFβ isoforms and signaling components in cell line models representing different stages of prostate cancer and studied the differential effects of specific isoforms on migratory and invasive behavior and induction of the PI3-kinase pathway. TGFβ1 and TGFβ3 were expressed in all cell lines, with TGFβ3 expression increasing in metastatic cell lines. Both TGFβ1 and TGFβ3 induced motility and invasive behavior in PC3 cells, however, TGFβ3 was significantly more potent than TGFβ1. TGFβRI and Smad3 inhibitors blocked TGFβ1 and TGFβ3 induced motility and invasion. TGFβ3 caused a significant increase in pAKT(ser473) in PC3 cells and PI3-kinase inhibitor LY294002 blocked TGFβ3 induced migration, invasion and phosphorylation of AKT. Both TGFβRI and Smad3 inhibitors blocked TGFβ3 induced pAKT(ser473). Based on these results, we conclude that TGFβ3 is expressed in metastatic prostate cancer cell lines and is involved in induction of invasive behavior in these cells. Furthermore, these effects of TGFβ3 are TGFβRI and Smad3 dependent and mediated via the PI3-kinase pathway.
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Dimitrijević M, Mitić K, Kuštrimović N, Vujić V, Stanojević S. NPY suppressed development of experimental autoimmune encephalomyelitis in Dark Agouti rats by disrupting costimulatory molecule interactions. J Neuroimmunol 2012; 245:23-31. [PMID: 22365383 DOI: 10.1016/j.jneuroim.2012.01.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Revised: 01/13/2012] [Accepted: 01/31/2012] [Indexed: 11/30/2022]
Abstract
Neuropeptide Y (NPY) suppressed clinical experimental autoimmune encephalomyelitis (EAE) and reduced numbers of CD28+, CD11b+ and CD80+ cells among spinal cord infiltrating cells at the peak of disease in Dark Agouti rat strain. Suppression of EAE was accompanied by the reduced expression of costimulatory CD80 and CD86 molecules on ED1+ macrophages and OX62+ dendritic cells in draining lymph nodes during the inductive phase of EAE. An inhibitor of dipeptidyl peptidase 4, an enzyme which terminates the action of NPY on Y1 receptor subtype, did not sustain the suppressive effect of NPY on the EAE development, suggesting involvement of Y2 and Y5 receptors.
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Affiliation(s)
- Mirjana Dimitrijević
- Institute of Virology, Vaccines and Sera, "Torlak", Immunology Research Center "Branislav Janković", Vojvode Stepe 458, 11152 Belgrade, Serbia.
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31
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Divergent actions by inhibitors of DP IV and APN family enzymes on CD4+ Teff cell motility and functions. Immunobiology 2011; 216:1295-301. [DOI: 10.1016/j.imbio.2011.07.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2010] [Accepted: 07/03/2011] [Indexed: 01/17/2023]
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Abstract
CD26 is a 110-kDa surface glycoprotein with intrinsic dipeptidyl peptidase IV (DPPIV) activity that is expressed on various cell types and has many biological functions. An important aspect of CD26 biology is its peptidase activity and its functional and physical association with molecules with key roles in human immunological programs. CD26 role in immune regulation has been extensively characterized, with recent findings elucidating its link age with signaling pathways and structures involved in T cell activation a well as antigen-presenting cell-T cell interaction, being a marker of diseas behavior clinically as well as playing an important role in autoimmune pathogenesis and development. Through the use of various experimental approaches and agents to influence CD26/DPPIV expression and activity, such as anti-CD26 antibodies, CD26/DPPIV chemical inhibitors, siRNAs to inhibit CD26 expression, overexpressing CD26 transfectants, soluble CD26 molecules and proteomic approach, we have shown that CD26 interacts with structures with essential cellular functions in T cell responses. We will review emerging data that suggest CD26 may be an appropriate therapeutic target for the treatment of selected immune disorders.
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Affiliation(s)
- Kei Ohnuma
- Division of Rheumatology and Allergy, Research Hospital, Institute of Medical Science, University of Tokyo, Shirokanedai, Minato-ku, Tokyo, Japan
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Reinhold D, Bank U, Entz D, Goihl A, Stoye D, Wrenger S, Brocke S, Thielitz A, Stefin S, Nordhoff K, Heimburg A, Täger M, Ansorge S. PETIR-001, a dual inhibitor of dipeptidyl peptidase IV (DP IV) and aminopeptidase N (APN), ameliorates experimental autoimmune encephalomyelitis in SJL/J mice. Biol Chem 2011; 392:233-7. [PMID: 21194377 DOI: 10.1515/bc.2011.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Cellular dipeptidyl peptidase IV (DP IV, CD26) and amino-peptidase N (APN, CD13) play regulatory roles in T cell activation and represent potential targets for treatment of inflammatory disorders. We have developed a novel therapeutic strategy, 'peptidase-targeted Immunoregulation' (PETIR™), which simultaneously targets both cellular DP IV and APN via selective binding sites different from the active sites with a single inhibitor. To prove the therapeutic concept of PETIR™ in autoimmunity of the central nervous system (CNS), we evaluated the effect of a single substance, PETIR-001, in an animal model of multiple sclerosis, experimental autoimmune encephalomyelitis (EAE) in SJL/J mice. Administration of PETIR-001 significantly delayed and decreased clinical signs of active EAE, when given in a therapeutic manner intraperitoneally from day 15 to day 24 after induction of EAE. Both the acute phase and the first relapse of EAE were markedly inhibited. Importantly, a similar therapeutic benefit was obtained after oral administration of PETIR-001 from day 12 to day 21 after disease induction. Our results demonstrate that PETIR-001 exhibits a therapeutic effect on EAE in SJL/J mice. Thus, PETIR™ represents a novel and efficient therapeutic approach for immunotherapy of CNS inflammation.
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Affiliation(s)
- Dirk Reinhold
- Institute of Molecular and Clinical Immunology, Otto von Guericke University Magdeburg, D-39120 Magdeburg, Germany.
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Songok EM, Osero B, McKinnon L, Rono MK, Apidi W, Matey EJ, Meyers AFA, Luo M, Kimani J, Wachihi C, Ball BT, Plummer FA, Mpoke S. CD26/dipeptidyl peptidase IV (CD26/DPPIV) is highly expressed in peripheral blood of HIV-1 exposed uninfected female sex workers. Virol J 2010; 7:343. [PMID: 21108831 PMCID: PMC3009705 DOI: 10.1186/1743-422x-7-343] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2010] [Accepted: 11/25/2010] [Indexed: 11/22/2022] Open
Abstract
Background Design of effective vaccines against the human immunodeficiency virus (HIV-1) continues to present formidable challenges. However, individuals who are exposed HIV-1 but do not get infected may reveal correlates of protection that may inform on effective vaccine design. A preliminary gene expression analysis of HIV resistant female sex workers (HIV-R) suggested a high expression CD26/DPPIV gene. Previous studies have indicated an anti-HIV effect of high CD26/DPPIV expressing cells in vitro. Similarly, high CD26/DPPIV protein levels in vivo have been shown to be a risk factor for type 2 diabetes. We carried out a study to confirm if the high CD26/DPPIV gene expression among the HIV-R were concordant with high blood protein levels and its correlation with clinical type 2 diabetes and other perturbations in the insulin signaling pathway. Results A quantitative CD26/DPPIV plasma analysis from 100 HIV-R, 100 HIV infected (HIV +) and 100 HIV negative controls (HIV Neg) showed a significantly elevated CD26/DPPIV concentration among the HIV-R group (mean 1315 ng/ml) than the HIV Neg (910 ng/ml) and HIV + (870 ng/ml, p < 0.001). Similarly a FACs analysis of cell associated DPPIV (CD26) revealed a higher CD26/DPPIV expression on CD4+ T-cells derived from HIV-R than from the HIV+ (90.30% vs 80.90 p = 0.002) and HIV Neg controls (90.30% vs 82.30 p < 0.001) respectively. A further comparison of the mean fluorescent intensity (MFI) of CD26/DPPIV expression showed a higher DPP4 MFI on HIV-R CD4+ T cells (median 118 vs 91 for HIV-Neg, p = 0.0003). An evaluation for hyperglycemia, did not confirm Type 2 diabetes but an impaired fasting glucose condition (5.775 mmol/L). A follow-up quantitative PCR analysis of the insulin signaling pathway genes showed a down expression of NFκB, a central mediator of the immune response and activator of HIV-1 transcription. Conclusion HIV resistant sex workers have a high expression of CD26/DPPIV in tandem with lowered immune activation markers. This may suggest a novel role for CD26/DPPIV in protection against HIV infection in vivo.
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Affiliation(s)
- Elijah M Songok
- Centre For Virus Research, Mbagathi Road Kenya Medical Research Institute, Nairobi, Kenya.
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Yazbeck R, Sulda ML, Howarth GS, Bleich A, Raber K, von Hörsten S, Holst JJ, Abbott CA. Dipeptidyl peptidase expression during experimental colitis in mice. Inflamm Bowel Dis 2010; 16:1340-51. [PMID: 20186930 DOI: 10.1002/ibd.21241] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
BACKGROUND We have previously demonstrated that inhibition of dipeptidyl peptidase (DP) activity partially attenuates dextran sulfate sodium (DSS) colitis in mice. The aim of this study was to further investigate the mechanisms of this protection. MATERIALS AND METHODS Wildtype (WT) and DPIV(-/-) mice consumed 2% DSS in drinking water for 6 days to induce colitis. Mice were treated with saline or the DP inhibitors Ile-Pyrr-(2-CN)*TFA or Ile-Thia. DP mRNA and enzyme levels were measured in the colon. Glucagon-like peptide (GLP)-2 and GLP-1 concentrations were determined by radioimmunoassay, regulatory T-cells (Tregs) by fluorescence activated cell sorting (FACS) on FOXp3+T cells in blood, and neutrophil infiltration assessed by myeloperoxidase (MPO) assay. RESULTS DP8 and DP2 mRNA levels were increased (P < 0.05) in WT+saline mice compared to untreated WT mice with colitis. Cytoplasmic DP enzyme activity was increased (P < 0.05) in DPIV(-/-) mice at day 6 of DSS, while DP2 activity was increased (P < 0.05) in WT mice with colitis. GLP-1 (63%) and GLP-2 (50%) concentrations increased in WT+Ile-Pyrr-(2-CN)*TFA mice compared to day-0 controls. MPO activity was lower in WT+Ile-Thia and WT+Ile-Pyrr-(2-CN)*TFA treated mice compared to WT+saline (P < 0.001) at day 6 colitis. CONCLUSIONS DP expression and activity are differentially regulated during DSS colitis, suggesting a pathophysiological role for these enzymes in human inflammatory bowel disease (IBD). DP inhibitors impaired neutrophil recruitment and maintenance of the Treg population during DSS-colitis, providing further preclinical evidence for the potential therapeutic use of these inhibitors in IBD. Finally, DPIV appears to play a critical role in mediating the protective effect of DP inhibitors.
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Affiliation(s)
- Roger Yazbeck
- School of Biological Sciences, Flinders University, Adelaide, South Australia, Australia
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36
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Tian L, Gao J, Hao J, Zhang Y, Yi H, O'Brien TD, Sorenson R, Luo J, Guo Z. Reversal of new-onset diabetes through modulating inflammation and stimulating beta-cell replication in nonobese diabetic mice by a dipeptidyl peptidase IV inhibitor. Endocrinology 2010; 151:3049-60. [PMID: 20444936 DOI: 10.1210/en.2010-0068] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Inhibition of dipeptidyl peptidase IV (DPP-IV) activity by NVP-DPP728, a DPP-IV inhibitor, improves the therapeutic efficacy of glucagon-like peptide-1 (GLP-1). CD26 is a membrane-associated glycoprotein with DPP-IV activity and is expressed on lymphocytes. We investigated the effect of NVP-DPP728 on reversing new-onset diabetes in nonobese diabetic (NOD) mice and modulating the inflammatory response and stimulating beta-cell regeneration. New-onset diabetic NOD mice were treated with NVP-DPP728 for 2, 4, and 6 wk. Blood glucose level was monitored. Regulatory T cells in thymus and secondary lymph nodes, TGF-beta1 and GLP-1 in plasma, and the insulin content in the pancreas were measured. Immunostaining for insulin and bromodeoxyuridine (BrdU) were performed. The correlation of beta-cell replication with inflammation was determined. In NVP-DPP728-treated NOD mice, diabetes could be reversed in 57, 74, and 73% of mice after 2, 4, and 6 wk treatment, respectively. Insulitis was reduced and the percentage of CD4(+)CD25(+)FoxP3(+) regulatory T cells was increased in treated NOD mice with remission. Plasma TGF-beta1 and GLP-1, the insulin content, and both insulin(+) and BrdU(+) beta-cells in pancreas were also significantly increased. No significant correlations were found between numbers of both insulin(+) and BrdU(+) beta-cells in islets and beta-cell area or islets with different insulitis score in NOD mice with remission of diabetes. In conclusion, NVP-DPP728 treatment can reverse new-onset diabetes in NOD mice by reducing insulitis, increasing CD4(+)CD25(+)FoxP3(+) regulatory T cells, and stimulating beta-cell replication. beta-Cell replication is not associated with the degree of inflammation in NVP-DPP728-treated NOD mice.
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Affiliation(s)
- Lei Tian
- Schulze Diabetes Institute and Department of Surgery, University of Minnesota, Minneapolis, Minnesota 55455, USA
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37
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Sitagliptin treatment of patients with type 2 diabetes does not affect CD4+ T-cell activation. J Diabetes Complications 2009; 24:209-13. [PMID: 19854074 DOI: 10.1016/j.jdiacomp.2009.09.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2009] [Revised: 08/10/2009] [Accepted: 09/10/2009] [Indexed: 11/26/2022]
Abstract
Dipeptidyl peptidase IV (DPP4) inhibitors have recently become widely used for treating type 2 diabetes, but in meta-analyses are associated with a mildly increased risk of all-cause infections. CD26 is a cell-surface form of DPP4 which can costimulate T-cell proliferation, raising the possibility that DPP4 inhibitors might adversely affect immune function. To address this issue in an observational study, two groups of 20 subjects each were recruited from a private endocrinology practice; one group consisted of type 2 diabetes patients treated for at least 6 months with the DPP4 inhibitor, sitagliptin, whereas patients in the other group had never been treated with this agent. The groups were similar with regard to sex and racial composition, body mass index, hemoglobin A(1c), and use of other medications for diabetes, but the sitagliptin group was slightly older. A blood sample from each patient was analyzed for CD4+ T-cell activation in response to phytohemagglutinin using adenosine triphosphate (ATP)-stimulated bioluminescence. There was not a significant difference in T-cell activation between the treatment groups (median, 419 and 481 ng/ml ATP in the groups that were and were not treated with sitagliptin, respectively). Thus the observed increased rate of infection in diabetic patients treated with sitagliptin cannot be explained by a major effect on T-cell activation. Randomized studies, preferably using several assays of immune function, should be performed to confirm and extend these findings.
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Ansorge S, Bank U, Heimburg A, Helmuth M, Koch G, Tadje J, Lendeckel U, Wolke C, Neubert K, Faust J, Fuchs P, Reinhold D, Thielitz A, Täger M. Recent insights into the role of dipeptidyl aminopeptidase IV (DPIV) and aminopeptidase N (APN) families in immune functions. Clin Chem Lab Med 2009; 47:253-61. [PMID: 19327105 DOI: 10.1515/cclm.2009.063] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
BACKGROUND In the past, different research groups could show that treatment of immune cells with inhibitors of post-proline splitting dipeptidyl aminopeptidases leads to functional changes in the immune system consistent with immunosuppression. This is due to the inhibition of proliferation of lymphocytes and the production of inflammatory cytokines of the TH1, TH2, and TH17, cells as well as the induction of immunosuppressive cytokines, such as transforming growth factor-beta1 (TGF-beta1) and interleukin (IL)-1RA. Until recently, most of the effects of these inhibitors on immune functions were attributed to the inhibition of dipeptidyl aminopeptidase IV (DPIV/CD26). With the identification of new peptidases of the DPIV family (DASH) with the same or similar substrate specificity [fibroblast activation protein (FAP), DP8/9], the question arose whether and to what extent the inhibition of intracellularly localized enzymes, DP8 and DP9, contribute to the observed immunosuppression. In addition, members of the aminopeptidase N (APN) family are also involved in the regulation of immune functions. Hence, the concept of a combined targeting of both families of peptidases for treatment of inflammatory diseases is a promising strategy. RESULTS/CONCLUSIONS Summarizing data obtained from the usage of different non-selective and selective inhibitors of DPIV, DP8/9, FAP, and DPII, this review provides evidence that in addition to DPIV, DP8/9 also regulate the immune response via modulation of cell cycle progression and cytokine production. The strongest and most consistent effects in vitro were, however, observed with non-selective inhibitors for the suppression of DNA synthesis and cytokine production. Similar effects were provoked by APN inhibitors, which were also found to suppress DNA synthesis and the production of inflammatory cytokines in vitro. However, different mechanisms and signaling pathways appear to mediate the cellular effects resulting from the inhibition of either APN or DPIV family members. In particular, members of the APN family uniquely influence the function of CD4+CD25+ regulatory T-cells. Consequently, the concomitant inhibition of both APN and DPIV enzyme families by means of two separate inhibitors or by binary inhibitors with specificity for both enzyme families (PETIR, peptidase targeted immunoregulation) synergistically affects immune cells on the level of cell cycle regulation, suppression of TH1, TH2, and TH17 cytokines as well as the activation of regulatory T-cells. Besides leukocytes, dermal cells as sebocytes, keratinocytes, and fibroblasts are also targeted by these inhibitors. This strongly suggests a broad potential of the multiple anti-inflammatory effects of PETIR in treatment of chronic inflammatory diseases, such as autoimmune diseases, allergies, and transplant rejections, as well as of inflammatory skin diseases, such as acne, psoriasis, rosacea or atopic dermatitis. The first active dual inhibitor, IP10.C8, has been developed by IMTM for the treatment of inflammatory skin diseases and has just entered the first phase II study.
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Frerker N, Raber K, Bode F, Skripuletz T, Nave H, Klemann C, Pabst R, Stephan M, Schade J, Brabant G, Wedekind D, Jacobs R, Jörns A, Forssmann U, Straub RH, Johannes S, Hoffmann T, Wagner L, Demuth HU, von Hörsten S. Phenotyping of congenic dipeptidyl peptidase 4 (DP4) deficient Dark Agouti (DA) rats suggests involvement of DP4 in neuro-, endocrine, and immune functions. Clin Chem Lab Med 2009; 47:275-87. [PMID: 19327106 DOI: 10.1515/cclm.2009.064] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
BACKGROUND Treatment of diabetes type 2 using chronic pharmacological inhibition of dipeptidyl peptidase 4 (DP4) still requires an in-depth analysis of models for chronic DP4 deficiency, because adverse reactions induced by some DP4 inhibitors have been described. METHODS In the present study, a novel congenic rat model of DP4 deficiency on a "DP4-high" DA rat genetic background was generated (DA.F344-Dpp4(m)/ SvH rats) and comprehensively phenotyped. RESULTS Similar to chronic pharmacological inhibition of DP4, DP4 deficient rats exhibited a phenotype involving reduced diet-induced body weight gain and improved glucose tolerance associated with increased levels of glucagon-like peptide-1 (GLP-1) and bound leptin as well as decreased aminotransferases and triglycerides. Additionally, DA.F344-Dpp4(m)/SvH rats showed anxiolytic-like and reduced stress-like responses, a phenomenon presently not targeted by DP4 inhibitors. However, several immune alterations, such as differential leukocyte subset composition at baseline, blunted natural killer cell and T-cell functions, and altered cytokine levels were observed. CONCLUSIONS While this animal model confirms a critical role of DP4 in GLP-1-dependent glucose regulation, genetically induced chronic DP4 deficiency apparently also affects stress-regulatory and immuneregulatory systems, indicating that the use of chronic DP4 inhibitors might have the potential to interfere with central nervous system and immune functions in vivo.
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Affiliation(s)
- Nadine Frerker
- Functional and Applied Anatomy, Hannover Medical School, Hannover, Germany
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40
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Reinhold D, Goihl A, Wrenger S, Reinhold A, Kühlmann UC, Faust J, Neubert K, Thielitz A, Brocke S, Täger M, Ansorge S, Bank U. Role of dipeptidyl peptidase IV (DP IV)-like enzymes in T lymphocyte activation: investigations in DP IV/CD26-knockout mice. Clin Chem Lab Med 2009; 47:268-74. [PMID: 19676138 DOI: 10.1515/cclm.2009.062] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
BACKGROUND Dipeptidyl peptidase IV (DP IV, CD26) and DP IV-like enzymes, such as dipeptidyl peptidase II (DP II), dipeptidyl peptidase 8 (DP8), and dipeptidyl peptidase 9 (DP9), have been recognized to regulate T lymphocyte activation. Lys[Z(NO2)]-thiazolidide (LZNT) and Lys[Z(NO2)]-pyrrolidide (LZNP), non-selective inhibitors of DP IV-like activity known to target DP IV as well as DP II, DP8, and DP9, suppress T lymphocyte proliferation in vitro. Moreover, these inhibitors are capable of attenuating the severity of autoimmune diseases, such as experimental autoimmune encephalomyelitis, the animal model of multiple sclerosis, and experimental arthritis, a model of human rheumatoid arthritis, in vivo, particularly in combination with inhibitors of aminopeptidase N (APN, CD13) enzymatic activity. METHODS Here, we studied the influence of non-selective and selective inhibitors of DP IV-like enzymes on DNA synthesis in mitogen-stimulated splenocytes from wild-type C57BL/6 mice and DP IV/CD26-knockout (DP IV/CD26-KO) mice. RESULTS LZNT and LZNP, the non-selective inhibitors of DP IV-like activity, suppressed the DNA synthesis in stimulated splenocytes from wild-type and DP IV/ CD26-KO mice to a comparable extent. Further, a selective inhibitor of DP8/DP9 activity was capable of suppressing DNA synthesis in mitogen-stimulated splenocytes of both wild-type and knockout mice to the same extent. In contrast, selective inhibitors of DP IV and DP II lacked this suppressive activity. CONCLUSIONS Our data support the hypothesis that DP8 and/or DP9 represent additional pharmacological targets for the suppression of T cell proliferation and for anti-inflammatory therapy.
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Affiliation(s)
- Dirk Reinhold
- Institute of Molecular and Clinical Immunology, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany.
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Vora KA, Porter G, Peng R, Cui Y, Pryor K, Eiermann G, Zaller DM. Genetic ablation or pharmacological blockade of dipeptidyl peptidase IV does not impact T cell-dependent immune responses. BMC Immunol 2009; 10:19. [PMID: 19358731 PMCID: PMC2674587 DOI: 10.1186/1471-2172-10-19] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2008] [Accepted: 04/09/2009] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Current literature suggests that dipeptidyl peptidase IV (DPP-IV; CD26) plays an essential role in T-dependent immune responses, a role that could have important clinical consequences. To rigorously define the role of DPP-IV in the immune system, we evaluated genetic and pharmacological inhibition of the enzyme on T-dependent immune responses in vivo. RESULTS The DPP-IV null animals mounted robust primary and secondary antibody responses to the T dependent antigens, 4-hydroxy-3-nitrophenylacetyl-ovalbumin (NP-Ova) and 4-hydroxy-3-nitrophenylacetyl-chicken gamma globulin (NP-CGG), which were comparable to wild type mice. Serum levels of antigen specific IgM, IgG1, IgG2a, IgG2b and IgG3 were similar between the two groups of animals. DPP-IV null animals mounted an efficient germinal center reaction by day 10 after antigen stimulation that was comparable to wild type mice. Moreover, the antibodies produced by DPP-IV null animals after repeated antigenic challenge were affinity matured. Similar observations were made using wild type animals treated with a highly selective DPP-IV inhibitor during the entire course of the experiments. T cell recall responses to ovalbumin and MOG peptide, evaluated by measuring proliferation and IL-2 release from cells isolated from draining lymph nodes, were equivalent in DPP-IV null and wild type animals. Furthermore, mice treated with DPP-IV inhibitor had intact T-cell recall responses to MOG peptide. In addition, female DPP-IV null and wild type mice treated with DPP-IV inhibitor exhibited normal and robust in vivo cytotoxic T cell responses after challenge with cells expressing the male H-Y minor histocompatibility antigen. CONCLUSION These data indicate Selective inhibition of DPP-IV does not impair T dependent immune responses to antigenic challenge.
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Affiliation(s)
- Kalpit A Vora
- Department of Immunology, Rahway, New Jersey 07065, USA.
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42
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Kühlmann UC, Chwieralski CE, van den Brule S, Röcken C, Reinhold D, Welte T, Bühling F. Modulation of cytokine production and silica-induced lung fibrosis by inhibitors of aminopeptidase N and of dipeptidyl peptidase-IV-related proteases. Life Sci 2008; 84:1-11. [PMID: 18973761 DOI: 10.1016/j.lfs.2008.10.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2007] [Revised: 09/11/2008] [Accepted: 10/04/2008] [Indexed: 01/23/2023]
Abstract
AIMS Dipeptidyl peptidase IV (DP IV)-related proteases and aminopeptidase N (APN) are drug targets in various diseases. Here we investigated for the first time the effects of DP-IV-related protease inhibitors and APN inhibitors on chronic inflammatory lung diseases. MAIN METHODS A murine model of silica (SiO2)-induced lung fibrosis and in vitro cultures of human lung epithelial cells and monocytes have been used and the influence of silica-treatment and inhibitors on inflammation and fibrosis has been measured. KEY FINDINGS We found increased inflammation and secretion of the chemokines IL-6, MCP-1 and MIP-alpha 2 weeks after SiO2 application, and increased lung fibrosis after 3 months. Treatment with the APN inhibitor actinonin reduced chemokine secretion in the lung and bronchoalveolar lavage fluid, and in cell culture, and decreased the level of fibrosis after 3 months. Treatment with inhibitors of DP-IV-related proteases, or a combination of DP IV inhibitors and APN inhibitors, had no significant effect. We found no obvious side effects of long-term treatment with inhibitors of APN and DP IV. SIGNIFICANCE Overall, our findings show that actinonin, an inhibitor of aminopeptidase N, might modulate chemokine secretion in the lung and thus attenuate the development of lung fibrosis. Additional targeting of DP-IV-related proteases had no significant effect on these processes.
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Affiliation(s)
- Ulrike C Kühlmann
- Institute of Immunology, Otto-von-Guericke-University-Magdeburg, Leipziger-Str. 44, 39120 Magdeburg, Germany
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Ohnuma K, Dang NH, Morimoto C. Revisiting an old acquaintance: CD26 and its molecular mechanisms in T cell function. Trends Immunol 2008; 29:295-301. [PMID: 18456553 DOI: 10.1016/j.it.2008.02.010] [Citation(s) in RCA: 186] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2007] [Revised: 01/21/2008] [Accepted: 02/11/2008] [Indexed: 12/19/2022]
Abstract
The role of CD26 in human T cell biology is puzzling. Despite being extensively characterized, it has been called 'a moonlighting protein' since it has multifunctional effects, but a definitive native ligand has not been identified. We summarize the current knowledge on the molecular mechanisms of CD26-mediated T cell costimulation and immune regulation. Work identifying a ligand for CD26 and elucidating the proximal signaling events associated with CD26-mediated T cell costimulation is also described. Finally, we discuss the involvement of CD26 in various pathophysiologic states as well as its suitability as a potential therapeutic target in selected immune diseases.
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Affiliation(s)
- Kei Ohnuma
- Division of Clinical Immunology, Advanced Clinical Research Center, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
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44
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Girardi ACC, Fukuda LE, Rossoni LV, Malnic G, Rebouças NA. Dipeptidyl peptidase IV inhibition downregulates Na+-H+exchanger NHE3 in rat renal proximal tubule. Am J Physiol Renal Physiol 2008; 294:F414-22. [DOI: 10.1152/ajprenal.00174.2007] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
In the microvillar microdomain of the kidney brush border, sodium hydrogen exchanger type 3 (NHE3) exists in physical complexes with the serine protease dipeptidyl peptidase IV (DPPIV). The purpose of this study was to explore the functional relationship between NHE3 and DPPIV in the intact proximal tubule in vivo. To this end, male Wistar rats were treated with an injection of the reversible DPPIV inhibitor Lys [Z(NO2)]-pyrrolidide (I40; 60 mg·kg−1·day−1ip) for 7 days. Rats injected with equal amounts of the noninhibitory compound Lys[Z(NO2)]-OH served as controls. Na+-H+exchange activity in isolated microvillar membrane vesicles was 45 ± 5% decreased in rats treated with I40. Membrane fractionation studies using isopycnic centrifugation revealed that I40 provoked redistribution of NHE3 along with a small fraction of DPPIV from the apical enriched microvillar membranes to the intermicrovillar microdomain of the brush border. I40 significantly increased urine output (67 ± 9%; P < 0.01), fractional sodium excretion (63 ± 7%; P < 0.01), as well as lithium clearance (81 ± 9%; P < 0.01), an index of end-proximal tubule delivery. Although not significant, a tendency toward decreased blood pressure and plasma pH/HCO3−was noted in I40-treated rats. These findings indicate that inhibition of DPPIV catalytic activity is associated with inhibition of NHE3-mediated NaHCO3reabsorption in rat renal proximal tubule. Inhibition of apical Na+-H+exchange is due to reduced abundance of NHE3 protein in the microvillar microdomain of the kidney brush border. Moreover, this study demonstrates a physiologically significant interaction between NHE3 and DPPIV in the intact proximal tubule in vivo.
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45
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Reinhold D, Biton A, Goihl A, Pieper S, Lendeckel U, Faust J, Neubert K, Bank U, Täger M, Ansorge S, Brocke S. Dual inhibition of dipeptidyl peptidase IV and aminopeptidase N suppresses inflammatory immune responses. Ann N Y Acad Sci 2007; 1110:402-9. [PMID: 17911455 DOI: 10.1196/annals.1423.042] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The ectopeptidases dipeptidyl peptidase IV (DP IV, CD26) and aminopeptidase N (APN, CD13) are known to regulate T cell activation. Since selective inhibitors of DP IV and APN suppress DNA synthesis and cytokine production of stimulated T cells in a TGF-beta1-dependent manner, we tested whether combined application of DP IV and APN inhibitors enhances this immunomodulatory effect. The results show that simultaneous application of DP IV and APN inhibitors significantly suppressed DNA synthesis in mitogen- or anti-CD3-stimulated human T cells in vitro when compared to the use of a single DP IV or APN inhibitor. Moreover, the combined action of DP IV and APN inhibitors markedly increased TGF-beta1 production associated with the observed immunosuppressive effects. In vivo, targeting both DP IV and APN led to a potent treatment of experimental autoimmune encephalomyelitis, an animal model of multiple sclerosis (MS). This review summarizes the evidence for the role of both enzymes in T cell activation in vitro and in vivo and provides a rationale for using combined and dual peptidase inhibitors to treat autoimmune diseases like MS.
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Affiliation(s)
- Dirk Reinhold
- Institute of Immunology, Otto-von-Guericke-University Magdeburg, Leipziger Str. 44, 39120 Magdeburg, Germany.
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46
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Inhibitors of dipeptidyl peptidase IV-like activity mediate antifibrotic effects in normal and keloid-derived skin fibroblasts. J Invest Dermatol 2007; 128:855-66. [PMID: 17943180 DOI: 10.1038/sj.jid.5701104] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Suppression of collagen and matrix synthesis and inhibition of the fibrogenic cytokine transforming growth factor-beta(1) (TGF-beta(1)) is a major therapeutic goal in the treatment of fibrosis and keloids. Inhibitors of dipeptidyl peptidase IV (DP IV)-like activity affect cell growth and cytokine production and are currently under investigation for the treatment of metabolic, autoimmune and inflammatory diseases. We show here that the inhibitors of DP IV-like activity, Lys[Z(NO(2))]-thiazolidide and Lys[Z(NO(2))]-pyrrolidide, suppress proliferation in human skin fibroblasts and keloid-derived skin fibroblasts in vitro. They significantly decrease TGF-beta(1) expression and secretion of procollagen type I C-terminal peptide in supernatants of both cell types. Furthermore, they abrogate the TGF-beta(1)-induced stimulation of collagen synthesis, matrix deposition, and TGF-beta(1) and fibronectin expression. Both inhibitors lead to dephosphorylation of mitogen-activated protein kinases pp38 and pERK1/2, which are activated upon TGF-beta1 stimulation and have been implicated in fibrogenesis. In a mouse model of dermal fibrosis, induced by repetitive intracutaneous injections of TGF-beta(1), the profibrotic effect of TGF-beta(1) detected by dermal thickening, collagen I, and alpha-smooth muscle actin expression, is significantly suppressed in the presence of inhibitors. Inhibition of DP IV-like enzymatic activity may therefore represent a promising therapeutic approach for the treatment of fibrotic skin disorders and keloids.
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47
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Davoodi J, Kelly J, Gendron NH, MacKenzie AE. The Simpson-Golabi-Behmel syndrome causative glypican-3, binds to and inhibits the dipeptidyl peptidase activity of CD26. Proteomics 2007; 7:2300-10. [PMID: 17549790 DOI: 10.1002/pmic.200600654] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Simpson-Golabi-Behmel syndrome (SGBS) is an X-linked condition shown to be the result of deletions of the glypican-3 (GPC3) gene. GPC3 is a proteoglycan localized to the cell membrane via a glycosylphosphatidyl-inositol (GPI) anchor. To further elucidate the GPC3 function(s), we have screened various cell lines for proteins that interact with GPC3, resulting in the isolation of a 115 kDa protein, identified as CD26. The interaction occurred with both the glycosylated and unglycosylated forms of GPC3 and led to the inhibition of CD26 peptidase activity. Moreover, introduction of CD26 into Cos-1 cells was accompanied by the up-regulation of cell growth, while inclusion of recombinant GPC3 in the media reduced the growth of CD26 transfected Cos-1 cells, drastically. Furthermore, HepG2 C3A cells containing CD26 underwent apoptosis in the presence of recombinant GPC3 in both concentration and time-dependant manner. In light of the fact that inhibition of CD26 reduces the rate of cell proliferation, we propose that a number of physical findings observed in SGBS patients may be a consequence of a direct interaction of GPC3 with CD26. Furthermore, GPC3 without the GPI anchor is capable of inducing apoptosis indicating that neither the GPI anchor nor the membrane attachment is required for apoptosis induction.
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MESH Headings
- Abnormalities, Multiple/genetics
- Abnormalities, Multiple/metabolism
- Abnormalities, Multiple/pathology
- Adenosine Deaminase/genetics
- Adenosine Deaminase/metabolism
- Animals
- Apoptosis/drug effects
- COS Cells
- Cell Line, Tumor
- Cell Proliferation/drug effects
- Chlorocebus aethiops
- Chromatography, Affinity
- Dipeptidyl Peptidase 4/genetics
- Dipeptidyl Peptidase 4/metabolism
- Electrophoresis, Polyacrylamide Gel
- Genetic Diseases, X-Linked/genetics
- Genetic Diseases, X-Linked/metabolism
- Genetic Diseases, X-Linked/pathology
- Gigantism/pathology
- Glycoproteins/genetics
- Glycoproteins/metabolism
- Glypicans/genetics
- Glypicans/metabolism
- Glypicans/pharmacology
- Humans
- Protein Binding
- Recombinant Proteins/chemistry
- Recombinant Proteins/isolation & purification
- Recombinant Proteins/metabolism
- Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
- Substance P/metabolism
- Syndrome
- Transfection
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Affiliation(s)
- Jamshid Davoodi
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran.
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48
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Preller V, Gerber A, Wrenger S, Togni M, Marguet D, Tadje J, Lendeckel U, Röcken C, Faust J, Neubert K, Schraven B, Martin R, Ansorge S, Brocke S, Reinhold D. TGF-beta1-mediated control of central nervous system inflammation and autoimmunity through the inhibitory receptor CD26. THE JOURNAL OF IMMUNOLOGY 2007; 178:4632-40. [PMID: 17372022 DOI: 10.4049/jimmunol.178.7.4632] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The T cell marker CD26/dipeptidyl peptidase (DP) IV is associated with an effector phenotype and markedly elevated in the human CNS disorder multiple sclerosis. However, little is known about the in vivo role of CD26/DP IV in health and disease, and the underlying mechanism of its function in CNS inflammation. To directly address the role of CD26/DP IV in vivo, we examined Th1 immune responses and susceptibility to experimental autoimmune encephalomyelitis in CD26(-/-) mice. We show that gene deletion of CD26 in mice leads to deregulation of Th1 immune responses. Although production of IFN-gamma and TNF-alpha by pathogenic T cells in response to myelin Ag was enhanced in CD26(-/-) mice, production of the immunosuppressive cytokine TGF-beta1 was diminished in vivo and in vitro. In contrast to the reduction in TGF-beta1 production, responsiveness to external TGF-beta1 was normal in T cells from CD26(-/-) mice, excluding alterations in TGF-beta1 sensitivity as a mechanism causing the loss of immune regulation. Natural ligands of CD26/DP IV induced TGF-beta1 production in T cells from wild-type mice. However, natural ligands of CD26/DP IV failed to elicit TGF-beta1 production in T cells from CD26(-/-) mice. The striking functional deregulation of Th1 immunity was also seen in vivo. Thus, clinical experimental autoimmune encephalomyelitis scores were significantly increased in CD26(-/-) mice immunized with peptide from myelin oligodendrocyte glycoprotein. These results identify CD26/DP IV as a nonredundant inhibitory receptor controlling T cell activation and Th1-mediated autoimmunity, and may have important therapeutic implications for the treatment of autoimmune CNS disease.
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MESH Headings
- Animals
- Autoimmunity/genetics
- Autoimmunity/immunology
- Central Nervous System/enzymology
- Central Nervous System/immunology
- Cytokines/metabolism
- Dipeptidyl Peptidase 4/genetics
- Dipeptidyl Peptidase 4/metabolism
- Dipeptidyl Peptidase 4/physiology
- Down-Regulation
- Encephalomyelitis, Autoimmune, Experimental/enzymology
- Encephalomyelitis, Autoimmune, Experimental/genetics
- Encephalomyelitis, Autoimmune, Experimental/immunology
- Ligands
- Lymphocyte Activation
- Mice
- Mice, Mutant Strains
- Receptors, Antigen, T-Cell/genetics
- Receptors, Antigen, T-Cell/metabolism
- Receptors, Antigen, T-Cell/physiology
- Sequence Deletion
- Th1 Cells/immunology
- Transforming Growth Factor beta1/genetics
- Transforming Growth Factor beta1/metabolism
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Affiliation(s)
- Vera Preller
- Institute of Immunology, Otto-von-Guericke-University Magdeburg, Leipziger Strasse 44, 39120 Magdeburg, Germany
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Lun SWM, Wong CK, Ko FWS, Hui DSC, Lam CWK. Increased expression of plasma and CD4+ T lymphocyte costimulatory molecule CD26 in adult patients with allergic asthma. J Clin Immunol 2007; 27:430-7. [PMID: 17525828 DOI: 10.1007/s10875-007-9093-z] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2006] [Accepted: 03/15/2007] [Indexed: 12/16/2022]
Abstract
CD26, which is a costimulatory molecule and peptidase, is responsible for the degradation of interferon (IFN)-gamma-induced chemokines. To elucidate the immunopathological role of CD26 in allergic asthma, we investigated plasma soluble CD26 (sCD26) concentration and its cell surface expression on lymphocytes, monocytes, CD4+ T helper, CD8+ T suppressor plus cytotoxic T, invariant natural killer T (iNKT), and CD19+ B lymphocytes in allergic asthmatic patients. Plasma sCD26 was significantly elevated in asthmatic patients regardless of inhaled corticosteroid treatment (all P < 0.05). Cell surface expression of CD26 was significantly up-regulated on lymphocytes, especially on CD4+ and iNKT lymphocytes (all P < 0.05), but not on other cell types. Significant positive correlations were found between sCD26 and the percentage of eosinophils, Th2-related chemokines CCL5 and CCL22, and costimulatory molecule sCTLA-4 (all P < 0.05). In conclusion, the aberrant expression of CD26 may contribute to the inflammatory process and Th2 predominance in the immunopathogenesis of allergic asthma.
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Affiliation(s)
- Samantha W M Lun
- Department of Chemical Pathology, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong
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Thielitz A, Reinhold D, Vetter R, Bank U, Helmuth M, Hartig R, Wrenger S, Wiswedel I, Lendeckel U, Kähne T, Neubert K, Faust J, Zouboulis CC, Ansorge S, Gollnick H. Inhibitors of Dipeptidyl Peptidase IV and Aminopeptidase N Target Major Pathogenetic Steps in Acne Initiation. J Invest Dermatol 2007; 127:1042-51. [PMID: 16778789 DOI: 10.1038/sj.jid.5700439] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Acne is a chronic disease hallmarked by sebaceous hyperplasia, follicular hyperkeratosis, and inflammation. Parallel targeting of these factors is required to treat acne effectively. Inhibitors of dipeptidyl peptidase IV (DP IV) and aminopeptidase N (APN) show strong anti-inflammatory effects on immune cells and therapeutic efficacy in autoimmune disorders. Our investigation focused on the expression and functional relevance of these ectopeptidases in three cell types which exhibit an altered phenotype in early acne lesions. We showed for the first time expression of DP IV and APN on human sebocytes. In the SZ95 sebocyte cell line, the DP IV inhibitors Lys[Z(NO2)]-thiazolidide and Lys[Z(NO2)]-pyrrolidide and the APN inhibitors actinonin and bestatin suppressed proliferation, enhanced terminal differentiation, and slightly decreased total neutral lipid production. The anti-inflammatory and differentiation-restoring cytokine IL-1 receptor antagonist was significantly upregulated in SZ95 sebocytes and the HaCaT keratinocyte cell line in the presence of inhibitors. Furthermore, the inhibitors suppressed proliferation and IL-2 production of Propionibacterium acnes-stimulated T cells ex vivo and enhanced the expression of the immunosuppressive cytokine transforming growth factor-beta1. Our data provide first evidence for a functional role of DP IV and APN in the sebaceous gland apparatus and for their inhibitors, used alone or in combination, as completely new substances possibly affecting acne pathogenesis in a therapeutic manner.
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Affiliation(s)
- Anja Thielitz
- Department of Dermatology and Venereology, Otto-von-Guericke University Magdeburg, Magdeburg, Germany.
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