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Widyawati T, Syahputra RA, Syarifah S, Sumantri IB. Analysis of Antidiabetic Activity of Squalene via In Silico and In Vivo Assay. Molecules 2023; 28:molecules28093783. [PMID: 37175192 PMCID: PMC10180456 DOI: 10.3390/molecules28093783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 04/10/2023] [Accepted: 04/20/2023] [Indexed: 05/15/2023] Open
Abstract
Squalene has been tested widely in pharmacological activity including anticancer, antiinflammatory, antioxidant, and antidiabetic properties. This study aims to examine antidiabetic activity of squalene in silico and in vivo models. In the in silico model, the PASS server was used to evaluate squalene antidiabetic properties. Meanwhile, the in vivo model was conducted on a Type 2 Diabetes Mellitus (T2DM) with the rats separated into three groups. These include squalene (160 mg/kgbw), metformin (45 mg/kgbw), and diabetic control (DC) (aquades 10 mL/kgbw) administered once daily for 14 days. Fasting Blood Glucose Level (FBGL), Dipeptidyl Peptidase IV (DPPIV), leptin, and Superoxide Dismutase (SOD) activity were measured to analysis antidiabetic and antioxidant activity. Additionally, the pancreas was analysed through histopathology to examine the islet cell. The results showed that in silico analysis supported squalene antidiabetic potential. In vivo experiment demonstrated that squalene decreased FBGL levels to 134.40 ± 16.95 mg/dL. The highest DPPIV level was in diabetic control- (61.26 ± 15.06 ng/mL), while squalene group showed the lowest level (44.09 ± 5.29 ng/mL). Both metformin and squalene groups showed minor pancreatic rupture on histopathology. Leptin levels were significantly higher (p < 0.05) in diabetic control group (15.39 ± 1.77 ng/mL) than both squalene- (13.86 ± 0.47 ng/mL) and metformin-treated groups (9.22 ± 0.84 ng/mL). SOD activity were higher in both squalene- and metformin-treated group, particularly 22.42 ± 0.27 U/mL and 22.81 ± 0.08 U/mL than in diabetic control (21.88 ± 0.97 U/mL). In conclusion, in silico and in vivo experiments provide evidence of squalene antidiabetic and antioxidant properties.
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Affiliation(s)
- Tri Widyawati
- Department of Pharmacology and Therapeutic, Faculty of Medicine, Universitas Sumatera Utara, Medan 20155, Sumatera Utara, Indonesia
| | - Rony Abdi Syahputra
- Department of Pharmacology, Faculty of Pharmacy, Universitas Sumatera Utara, Medan 20155, Sumatera Utara, Indonesia
| | - Siti Syarifah
- Department of Pharmacology and Therapeutic, Faculty of Medicine, Universitas Sumatera Utara, Medan 20155, Sumatera Utara, Indonesia
| | - Imam Bagus Sumantri
- Department of Pharmaceutical Biology, Faculty of Pharmacy, Universitas Sumatera Utara, Medan 20155, Sumatera Utara, Indonesia
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Barchetta I, Cimini FA, Dule S, Cavallo MG. Dipeptidyl Peptidase 4 (DPP4) as A Novel Adipokine: Role in Metabolism and Fat Homeostasis. Biomedicines 2022; 10:biomedicines10092306. [PMID: 36140405 PMCID: PMC9496088 DOI: 10.3390/biomedicines10092306] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 09/12/2022] [Accepted: 09/14/2022] [Indexed: 11/16/2022] Open
Abstract
Dipeptidyl peptidase 4 (DPP4) is a molecule implicated in the regulation of metabolic homeostasis and inflammatory processes, and it exerts its main action through its enzymatic activity. DPP4 represents the enzyme most involved in the catabolism of incretin hormones; thus, its activity impacts appetite, energy balance, and the fine regulation of glucose homeostasis. Indeed, DPP4 inhibitors represent a class of antidiabetic agents widely used for the treatment of Type 2 diabetes mellitus (T2DM). DPP4 also acts as an adipokine and is mainly secreted by the adipose tissue, mostly from mature adipocytes of the visceral compartment, where it exerts autocrine and paracrine activities. DPP4 can disrupt insulin signaling within the adipocyte and in other target cells and tissues, where it also favors the development of a proinflammatory environment. This is likely at the basis of the presence of elevated circulating DPP4 levels in several metabolic diseases. In this review, we summarize the most recent evidence of the role of the DPP4 as an adipokine-regulating glucose/insulin metabolism and fat homeostasis, with a particular focus on clinical outcomes associated with its increased secretion in the presence of adipose tissue accumulation and dysfunction.
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Huang J, Liu X, Wei Y, Li X, Gao S, Dong L, Rao X, Zhong J. Emerging Role of Dipeptidyl Peptidase-4 in Autoimmune Disease. Front Immunol 2022; 13:830863. [PMID: 35309368 PMCID: PMC8931313 DOI: 10.3389/fimmu.2022.830863] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 02/14/2022] [Indexed: 12/12/2022] Open
Abstract
Dipeptidyl-peptidase IV (DPP4), originally identified as an aminopeptidase in 1960s, is an ubiquitously expressed protease presented as either a membrane-bound or soluble form. DPP4 cleaves dipeptide off from the N-terminal of its substrates, altering the bioactivity of its substrates. Subsequent studies reveal that DPP4 is also involved in various cellular processes by directly binding to a number of ligands, including adenosine deaminase, CD45, fibronectin, plasminogen, and caveolin-1. In recent years, many novel functions of DPP4, such as promoting fibrosis and mediating virus entry, have been discovered. Due to its implication in fibrotic response and immunoregulation, increasing studies are focusing on the potential role of DPP4 in inflammatory disorders. As a moonlighting protein, DPP4 possesses multiple functions in different types of cells, including both enzymatic and non-enzymatic functions. However, most of the review articles on the role of DPP4 in autoimmune disease were focused on the association between DPP4 enzymatic inhibitors and the risk of autoimmune disease. An updated comprehensive summary of DPP4’s immunoregulatory actions including both enzymatic dependent and independent functions is needed. In this article, we will review the recent advances of DPP4 in immune regulation and autoimmune rheumatic disease.
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Affiliation(s)
- Jie Huang
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Xinxin Liu
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Yingying Wei
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Xinlu Li
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Shupei Gao
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Lingli Dong
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
- *Correspondence: Jixin Zhong, ; Xiaoquan Rao, ; Lingli Dong,
| | - Xiaoquan Rao
- Department of Cardiovascular Medicine, Tongji Hospital, Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
- *Correspondence: Jixin Zhong, ; Xiaoquan Rao, ; Lingli Dong,
| | - Jixin Zhong
- Department of Rheumatology and Immunology, Tongji Hospital, Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
- *Correspondence: Jixin Zhong, ; Xiaoquan Rao, ; Lingli Dong,
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Nahvi RJ, Tanelian A, Nwokafor C, Hollander CM, Peacock L, Sabban EL. Intranasal Neuropeptide Y as a Potential Therapeutic for Depressive Behavior in the Rodent Single Prolonged Stress Model in Females. Front Behav Neurosci 2021; 15:705579. [PMID: 34566592 PMCID: PMC8456029 DOI: 10.3389/fnbeh.2021.705579] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Accepted: 07/19/2021] [Indexed: 01/14/2023] Open
Abstract
The susceptibility to stress-elicited disorders is markedly influenced by sex. Women are twice as likely as men to develop posttraumatic stress disorder (PTSD), depression, anxiety disorders, and social impairments following exposure to traumatic stress. However, most of the studies in animal models examining putative therapeutics for stress-triggered impairments, including single prolonged stress (SPS), were performed predominantly with males. Previous studies in males demonstrated that intranasal neuropeptide Y (NPY) can provide therapeutic relief of many SPS-triggered behaviors, but is ineffective in females at the same dose. Thus, females may need a higher dose of exogenous NPY to attain a therapeutically significant concentration since the overwhelming majority of studies found that NPY levels in females in many brain regions are lower than in male rodents. Here, we examined SPS as an appropriate model to elicit many PTSD-associated symptoms in females and whether intranasal NPY at higher doses than with males is able to alter the development of SPS-triggered behavioral impairments. Sprague-Dawley female rats were exposed to SPS only, or in a separate cohort after SPS stressors were immediately infused intranasally with one of several doses of NPY, starting with 600 μg/rat—four times the dose effective in males. In the third cohort of animals, females were infused intranasally with either 600 μg NPY, omarigliptin [a dipeptidyl peptidase IV (DPP4) inhibitor], or both right after the SPS stressors. After 19 days they were tested on several behavioral tests. SPS elicited significant depressive/despair like behavior on the forced swim test (FST), anxiety behavior on the elevated plus maze (EPM), as well as impaired social interaction. On the FST, there was a dose-response effect of intranasal NPY, with 1,200 μg, but not 600 μg, preventing the development of the SPS-elicited depressive-like behavior. The omarigliptin and 600 μg NPY combined treatment, but neither alone, was also sufficient at preventing depressive-like behavior on the FST. The results demonstrate that: (1) SPS elicits several behavioral manifestations of PTSD in females; (2) early intervention with a high dose of intranasal NPY has therapeutic potential also for females; and (3) NPY cleavage by DPP4 may play a role in the higher dose requirement for females.
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Affiliation(s)
- Roxanna J Nahvi
- Department of Biochemistry and Molecular Biology, New York Medical College, Valhalla, NY, United States
| | - Arax Tanelian
- Department of Biochemistry and Molecular Biology, New York Medical College, Valhalla, NY, United States
| | - Chiso Nwokafor
- Department of Biochemistry and Molecular Biology, New York Medical College, Valhalla, NY, United States
| | - Callie M Hollander
- Department of Biochemistry and Molecular Biology, New York Medical College, Valhalla, NY, United States
| | - Lauren Peacock
- Department of Biochemistry and Molecular Biology, New York Medical College, Valhalla, NY, United States
| | - Esther L Sabban
- Department of Biochemistry and Molecular Biology, New York Medical College, Valhalla, NY, United States
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Alicic RZ, Cox EJ, Neumiller JJ, Tuttle KR. Incretin drugs in diabetic kidney disease: biological mechanisms and clinical evidence. Nat Rev Nephrol 2021; 17:227-244. [PMID: 33219281 DOI: 10.1038/s41581-020-00367-2] [Citation(s) in RCA: 84] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/16/2020] [Indexed: 01/30/2023]
Abstract
As the prevalence of diabetes continues to climb, the number of individuals living with diabetic complications will reach an unprecedented magnitude. The emergence of new glucose-lowering agents - sodium-glucose cotransporter 2 inhibitors and incretin therapies - has markedly changed the treatment landscape of type 2 diabetes mellitus. In addition to effectively lowering glucose, incretin drugs, which include glucagon-like peptide 1 receptor (GLP1R) agonists and dipeptidyl peptidase 4 (DPP4) inhibitors, can also reduce blood pressure, body weight, the risk of developing or worsening chronic kidney disease and/or atherosclerotic cardiovascular events, and the risk of death. Although kidney disease events have thus far been secondary outcomes in clinical trials, an ongoing phase III trial in patients with diabetic kidney disease will test the effect of a GLP1R agonist on a primary kidney disease outcome. Experimental data have identified the modulation of innate immunity and inflammation as plausible biological mechanisms underpinning the kidney-protective effects of incretin-based agents. These drugs block the mechanisms involved in the pathogenesis of kidney damage, including the activation of resident mononuclear phagocytes, tissue infiltration by non-resident inflammatory cells, and the production of pro-inflammatory cytokines and adhesion molecules. GLP1R agonists and DPP4 inhibitors might also attenuate oxidative stress, fibrosis and cellular apoptosis in the kidney.
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Affiliation(s)
- Radica Z Alicic
- Providence Medical Research Center, Providence Health Care, Spokane, WA, USA.,Department of Medicine, University of Washington School of Medicine, Spokane and Seattle, WA, USA
| | - Emily J Cox
- Providence Medical Research Center, Providence Health Care, Spokane, WA, USA
| | - Joshua J Neumiller
- Department of Pharmacotherapy, College of Pharmacy and Pharmaceutical Sciences, Washington State University, Spokane, WA, USA
| | - Katherine R Tuttle
- Providence Medical Research Center, Providence Health Care, Spokane, WA, USA. .,Nephrology Division, Kidney Research Institute and Institute of Translational Health Sciences, University of Washington, Spokane and Seattle, WA, USA.
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Schmid F, Mayer C, Büttner-Herold M, von Hörsten S, Amann K, Daniel C. CD161a-positive natural killer (NK) cells and α-smooth muscle actin-positive myofibroblasts were upregulated by extrarenal DPP4 in a rat model of acute renal rejection. Diabetes Res Clin Pract 2021; 173:108691. [PMID: 33549675 DOI: 10.1016/j.diabres.2021.108691] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 01/04/2021] [Accepted: 01/24/2021] [Indexed: 12/29/2022]
Abstract
AIMS Systemic inhibition of dipeptidyl peptidase 4 (DPP4) showed a protective effect in several transplant models. Here we assessed the specific role of extrarenal DPP4 in renal transplant rejection. METHODS Kidneys from wildtype (wt) F344 rats were either transplanted in wt Dark Agouti or congenic rats not expressing DPP4. The remaining, not transplanted donor kidney served as healthy controls. To investigate early inflammatory events rats were sacrificed 3 days after transplantation and kidneys were evaluated for inflammatory cells, capillary rarefaction, proliferation, apoptosis and myofibroblasts by immunohistochemistry. RESULTS Capillary ERG-1-positive endothelial cells were significantly more abundant in renal cortex when transplanted into DPP4 deficient compared to wt recipients. In contrast, TGF-ß and myofibroblasts were reduced by more than 25% in kidneys transplanted into DPP4 deficient compared to wt recipients. Numbers of CD161a-positive NK-cells were significantly lower in allografts in DPP4 deficient compared to wt recipients. Numbers of all other investigated immune cells were not affected by the lack of extrarenal DPP4. CONCLUSION In early transplant rejection extrarenal DPP4 is involved in the recruitment of NK-cells and early fibrosis. Beneficial effects were less pronounced than reported for systemic DPP4 inhibition, indicating that renal DPP4 is an important player in transplantation-mediated injury.
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Affiliation(s)
- Franziska Schmid
- Department of Nephropathology, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | - Christina Mayer
- Department of Nephropathology, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | - Maike Büttner-Herold
- Department of Nephropathology, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | - Stephan von Hörsten
- Department of Experimental Therapy, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | - Kerstin Amann
- Department of Nephropathology, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | - Christoph Daniel
- Department of Nephropathology, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany.
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Romacho T, Sell H, Indrakusuma I, Roehrborn D, Castañeda TR, Jelenik T, Markgraf D, Hartwig S, Weiss J, Al-Hasani H, Roden M, Eckel J. DPP4 deletion in adipose tissue improves hepatic insulin sensitivity in diet-induced obesity. Am J Physiol Endocrinol Metab 2020; 318:E590-E599. [PMID: 31891536 DOI: 10.1152/ajpendo.00323.2019] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Besides a therapeutic target for type 2 diabetes, dipeptidyl peptidase 4 (DPP4) is an adipokine potentially upregulated in human obesity. We aimed to explore the role of adipocyte-derived DPP4 in diet-induced obesity and insulin resistance with an adipose tissue-specific knockout (AT-DPP4-KO) mouse. Wild-type and AT-DPP4-KO mice were fed for 24 wk with a high fat diet (HFD) and characterized for body weight, glucose tolerance, insulin sensitivity by hyperinsulinemic-euglycemic clamp, and body composition and hepatic fat content. Image and molecular biology analysis of inflammation, as well as adipokine secretion, was performed in AT by immunohistochemistry, Western blot, real-time-PCR, and ELISA. Incretin levels were determined by Luminex kits. Under HFD, AT-DPP4-KO displayed markedly reduced circulating DPP4 concentrations, proving AT as a relevant source. Independently of glucose-stimulated incretin hormones, AT-DPP4-KO had improved glucose tolerance and hepatic insulin sensitivity. AT-DPP4-KO displayed smaller adipocytes and increased anti-inflammatory markers. IGF binding protein 3 (IGFBP3) levels were lower in AT and serum, whereas free IGF1 was increased. The absence of adipose DPP4 triggers beneficial AT remodeling with decreased production of IGFBP3 during HFD, likely contributing to the observed, improved hepatic insulin sensitivity.
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Affiliation(s)
- Tania Romacho
- Paul-Langerhans-Group for Integrative Physiology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
- German Center for Diabetes Research (DZD), München-Neuherberg, Germany
- komIT Center of Competence for Innovative Diabetes Therapy, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Henrike Sell
- German Center for Diabetes Research (DZD), München-Neuherberg, Germany
- Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Ira Indrakusuma
- Paul-Langerhans-Group for Integrative Physiology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
- German Center for Diabetes Research (DZD), München-Neuherberg, Germany
| | - Diana Roehrborn
- Paul-Langerhans-Group for Integrative Physiology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
- German Center for Diabetes Research (DZD), München-Neuherberg, Germany
| | - Tamara R Castañeda
- German Center for Diabetes Research (DZD), München-Neuherberg, Germany
- Institute for Clinical Biochemistry and Pathobiochemistry, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Tomas Jelenik
- German Center for Diabetes Research (DZD), München-Neuherberg, Germany
- Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Daniel Markgraf
- German Center for Diabetes Research (DZD), München-Neuherberg, Germany
- Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Sonja Hartwig
- German Center for Diabetes Research (DZD), München-Neuherberg, Germany
- Institute for Clinical Biochemistry and Pathobiochemistry, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Jürgen Weiss
- German Center for Diabetes Research (DZD), München-Neuherberg, Germany
- Institute for Clinical Biochemistry and Pathobiochemistry, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Hadi Al-Hasani
- German Center for Diabetes Research (DZD), München-Neuherberg, Germany
- Institute for Clinical Biochemistry and Pathobiochemistry, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Michael Roden
- German Center for Diabetes Research (DZD), München-Neuherberg, Germany
- Institute for Clinical Diabetology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
- Division of Endocrinology and Diabetology, Medical Faculty, Heinrich-Heine University Düsseldorf, Düsseldorf, Germany
| | - Jürgen Eckel
- Paul-Langerhans-Group for Integrative Physiology, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
- German Center for Diabetes Research (DZD), München-Neuherberg, Germany
- komIT Center of Competence for Innovative Diabetes Therapy, German Diabetes Center, Leibniz Center for Diabetes Research, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
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Lin SR, Chang CH, Tsai MJ, Cheng H, Chen JC, Leong MK, Weng CF. The perceptions of natural compounds against dipeptidyl peptidase 4 in diabetes: from in silico to in vivo. Ther Adv Chronic Dis 2019; 10:2040622319875305. [PMID: 31555430 PMCID: PMC6753520 DOI: 10.1177/2040622319875305] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Accepted: 08/12/2019] [Indexed: 12/13/2022] Open
Abstract
Dipeptidyl peptidase IV (DPP-4), an incretin glucagon-like peptide-1 (GLP-1) degrading enzyme, contains two forms and it can exert various physiological functions particular in controlling blood glucose through the action of GLP-1. In diabetic use, the DPP-4 inhibitor can block the DDP-4 to attenuate GLP-1 degradation and prolong GLP-1 its action and sensitize insulin activity for the purpose of lowering blood glucose. Nonetheless the adverse effects of DPP-4 inhibitors severely hinder their clinical applications, and notably there is a clinical demand for novel DPP-4 inhibitors from various sources including chemical synthesis, herbs, and plants with fewer side effects. In this review, we highlight various strategies, namely computational biology (in silico), in vitro enzymatic and cell assays, and in vivo animal tests, for seeking natural DPP-4 inhibitors from botanic sources including herbs and plants. The pros and cons of all approaches for new inhibitor candidates or hits will be under discussion.
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Affiliation(s)
- Shian-Ren Lin
- Department of Life Science and Institute of
Biotechnology, National Dong Hwa University, Hualien
| | - Chia-Hsiang Chang
- Department of Life Science and Institute of
Biotechnology, National Dong Hwa University, Hualien
| | - May-Jwan Tsai
- Neural Regeneration Laboratory, Neurological
Institute, Taipei Veterans General Hospital, Beitou, Taipei
| | - Henrich Cheng
- Neural Regeneration Laboratory, Neurological
Institute, Taipei Veterans General Hospital, Beitou, Taipei
| | - Jian-Chyi Chen
- Department of Biotechnology, Southern Taiwan
University of Science and Technology, Yungkang, Tainan
| | - Max K. Leong
- Department of Chemistry, National Dong Hwa
University, No.1, Sec.2, Da-Hsueh Road, Shoufeng, Hualien, 97401,
Taiwan
| | - Ching-Feng Weng
- Department of Basic Medical Science, Center for
Transitional Medicine, Xiamen Medical College, Xiamen, 361023, China
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Golub Y, Schildbach EM, Touma C, Kratz O, Moll GH, von Hörsten S, Canneva F. Role of hypothalamus-pituitary-adrenal axis modulation in the stress-resilient phenotype of DPP4-deficient rats. Behav Brain Res 2019; 356:243-249. [DOI: 10.1016/j.bbr.2018.08.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Revised: 08/29/2018] [Accepted: 08/30/2018] [Indexed: 01/30/2023]
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10
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Zubkov EA, Zorkina YA, Orshanskaya EV, Khlebnikova NN, Krupina NA, Chekhonin VP. Changes in Gene Expression Profiles in Adult Rat Brain Structures after Neonatal Action of Dipeptidyl Peptidase-IV Inhibitors. Neuropsychobiology 2018; 76:89-99. [PMID: 29860255 DOI: 10.1159/000488367] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Accepted: 03/13/2018] [Indexed: 12/20/2022]
Abstract
BACKGROUND Previous studies have shown the development of emotional and motivational disorders, such as anxiety-depression-like disorders with increased aggression in adolescent and adult Wistar rats, occurs after neonatal exposure to the dipeptidyl peptidase-IV (DPP-IV, EC 3.4.14.5) inhibitors diprotin A and sitagliptin (postnatal days 5-18). METHODS In this study, using real-time PCR, we evaluated changes in the gene expression of serine protease DPP-IV and prolyl endopeptidase (PREP, EC 3.4.21.26; dpp4 and prep genes), monoamine oxidase А (maoA) and B (maoB), and serotonin transporter (SERT; sert) in the brain structures from 3-month-old rats after postnatal action of DPP-IV inhibitors diprotin A and sitagliptin. RESULTS Dpp4, sert, and maoB gene expression increased and maoA gene expression changed with a tendency to increase in the striatum of rats with neonatal sitagliptin action. The increase of maoA gene expression was also shown in the amygdala. An increase in prep gene expression was found in the striatum of rats with the neonatal action of diprotin A, and a decrease in maoB gene expression was observed in the amygdala. We detected a significant downward trend in sert gene expression in the frontal cortex and amygdala, as well as a tendency to increase in maoA gene expression in the hypothalamus. DISCUSSION These findings suggest that changes in the expression of the abovementioned genes are associated with the development of anxiety and depression, with increased aggression caused by the neonatal action of diprotin A and sitagliptin.
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Affiliation(s)
- Eugene A Zubkov
- Department of Fundamental and Applied Neurobiology, V.P. Serbsky National Medical Research Center of Psyсhiatry and Narcology, Moscow, Russian Federation
| | - Yana A Zorkina
- Department of Fundamental and Applied Neurobiology, V.P. Serbsky National Medical Research Center of Psyсhiatry and Narcology, Moscow, Russian Federation
| | - Elena V Orshanskaya
- The Institute of General Pathology and Pathophysiology, Moscow, Russian Federation
| | | | - Natalia A Krupina
- The Institute of General Pathology and Pathophysiology, Moscow, Russian Federation
| | - Vladimir P Chekhonin
- Department of Fundamental and Applied Neurobiology, V.P. Serbsky National Medical Research Center of Psyсhiatry and Narcology, Moscow, Russian Federation
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Emson C, Pham TH, Manetz S, Newbold P. Periostin and Dipeptidyl Peptidase-4: Potential Biomarkers of Interleukin 13 Pathway Activation in Asthma and Allergy. Immunol Allergy Clin North Am 2018; 38:611-628. [PMID: 30342583 DOI: 10.1016/j.iac.2018.06.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Periostin and dipeptidyl peptidase-4 (DPP-4) are proteins induced by type 2 cytokines interleukin (IL)-4 and IL-13 and show increased expression in asthma and diseases with type 2 inflammation, including atopic dermatitis and chronic rhinosinusitis. Both proteins can also be induced by other stimuli, such as profibrotic factors, which may confound their specificity as biomarkers of IL-13 pathway activation and type 2-driven disease. DPP-4 is important in glucose metabolism; therefore, serum concentrations may be confounded by the presence of concomitant metabolic disease. This review evaluates the potential of these biomarkers for anti-IL-13-directed therapy in asthma and diseases with type 2 inflammation.
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Affiliation(s)
- Claire Emson
- MedImmune, One MedImmune Way, Gaithersburg, MD 20878, USA.
| | | | - Scott Manetz
- MedImmune, One MedImmune Way, Gaithersburg, MD 20878, USA
| | - Paul Newbold
- MedImmune, One MedImmune Way, Gaithersburg, MD 20878, USA
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12
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Plank AC, Canneva F, Raber KA, Urbach YK, Dobner J, Puchades M, Bjaalie JG, Gillmann C, Bäuerle T, Riess O, Nguyen HHP, von Hörsten S. Early Alterations in Operant Performance and Prominent Huntingtin Aggregation in a Congenic F344 Rat Line of the Classical CAG n51trunc Model of Huntington Disease. Front Neurosci 2018; 12:11. [PMID: 29422836 PMCID: PMC5788972 DOI: 10.3389/fnins.2018.00011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Accepted: 01/08/2018] [Indexed: 11/17/2022] Open
Abstract
The transgenic rat model of Huntington disease expressing a fragment of mutant HTT (tgHD rat) has been thoroughly characterized and reproduces hallmark symptoms of human adult-onset HD. Pursuing the optimization of this model for evaluation of translational therapeutic approaches, the F344 inbred rat strain was considered as advantageous genetic background for the expression of the HD transgenic construct. In the present study, a novel congenic line of the SPRDtgHD transgenic model of HD, carrying 51 CAG repeats, was generated on the F344 rat genetic background. To assess the behavioral phenotype, classical assays investigating motor function, emotion, and sensorimotor gating were applied, along with automated screening of metabolic and activity parameters as well as operant conditioning tasks. The neuropathological phenotype was analyzed by immunohistochemistry and ex vivo magnetic resonance imaging. F344tgHD rats displayed markedly reduced anxiety-like behavior in the social interaction test and elevated impulsivity traits already at 3 months of age. Neuropathologically, reduced striatal volume and pronounced aggregation of mutant huntingtin in several brain regions were detected at later disease stage. In conclusion, the congenic F344tgHD model reproduces key aspects of the human HD phenotype, substantiating its value for translational therapeutic approaches.
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Affiliation(s)
- Anne-Christine Plank
- Experimental Therapy, Preclinical Experimental Center, University Clinics Erlangen, Erlangen, Germany
| | - Fabio Canneva
- Experimental Therapy, Preclinical Experimental Center, University Clinics Erlangen, Erlangen, Germany
| | - Kerstin A Raber
- Experimental Therapy, Preclinical Experimental Center, University Clinics Erlangen, Erlangen, Germany
| | - Yvonne K Urbach
- Experimental Therapy, Preclinical Experimental Center, University Clinics Erlangen, Erlangen, Germany
| | - Julia Dobner
- Experimental Therapy, Preclinical Experimental Center, University Clinics Erlangen, Erlangen, Germany
| | - Maja Puchades
- Neural Systems Laboratory, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
| | - Jan G Bjaalie
- Neural Systems Laboratory, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
| | - Clarissa Gillmann
- Preclinical Imaging Platform Erlangen, Institute of Radiology, University Clinics Erlangen, Erlangen, Germany
| | - Tobias Bäuerle
- Preclinical Imaging Platform Erlangen, Institute of Radiology, University Clinics Erlangen, Erlangen, Germany
| | - Olaf Riess
- Institute of Medical Genetics and Applied Genomics, University Clinics Tuebingen, Tuebingen, Germany
| | - Hoa H P Nguyen
- Institute of Medical Genetics and Applied Genomics, University Clinics Tuebingen, Tuebingen, Germany
| | - Stephan von Hörsten
- Experimental Therapy, Preclinical Experimental Center, University Clinics Erlangen, Erlangen, Germany
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13
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Wagner L, Kaestner F, Wolf R, Stiller H, Heiser U, Manhart S, Hoffmann T, Rahfeld JU, Demuth HU, Rothermundt M, von Hörsten S. Identifying neuropeptide Y (NPY) as the main stress-related substrate of dipeptidyl peptidase 4 (DPP4) in blood circulation. Neuropeptides 2016; 57:21-34. [PMID: 26988064 DOI: 10.1016/j.npep.2016.02.007] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Revised: 01/21/2016] [Accepted: 02/25/2016] [Indexed: 02/07/2023]
Abstract
BACKGROUND Dipeptidyl peptidase 4 (DPP4; EC 3.4.14.5; CD26) is a membrane-bound or shedded serine protease that hydrolyzes dipeptides from the N-terminus of peptides with either proline or alanine at the penultimate position. Substrates of DPP4 include several stress-related neuropeptides implicated in anxiety, depression and schizophrenia. A decline of DPP4-like activity has been reported in sera from depressed patient, but not fully characterized regarding DPP4-like enzymes, therapeutic interventions and protein. METHODS Sera from 16 melancholic- and 16 non-melancholic-depressed patients were evaluated for DPP4-like activities and the concentration of soluble DPP4 protein before and after treatment by anti-depressive therapies. Post-translational modification of DPP4-isoforms and degradation of NPY, Peptide YY (PYY), Galanin-like peptide (GALP), Orexin B (OrxB), OrxA, pituitary adenylate cyclase-activating polypeptide (PACAP) and substance P (SP) were studied in serum and in ex vivo human blood. N-terminal truncation of biotinylated NPY by endothelial membrane-bound DPP4 versus soluble DPP4 was determined in rat brain perfusates and spiked sera. RESULTS Lower DPP4 activities in depressed patients were reversed by anti-depressive treatment. In sera, DPP4 contributed to more than 90% of the overall DPP4-like activity and correlated with its protein concentration. NPY displayed equal degradation in serum and blood, and was equally truncated by serum and endothelial DPP4. In addition, GALP and rat OrxB were identified as novel substrates of DPP4. CONCLUSION NPY is the best DPP4-substrate in blood, being truncated by soluble and membrane DPP4, respectively. The decline of soluble DPP4 in acute depression could be reversed upon anti-depressive treatment. Peptidases from three functional compartments regulate the bioactivity of NPY in blood.
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Affiliation(s)
- Leona Wagner
- Deutschsprachige Selbsthilfegruppe für Alkaptonurie (DSAKU) e,V., Stuttgart, Germany; Probiodrug AG, Halle, Germany; Universitätsklinikum Erlangen, Department of Experimental Therapy, Erlangen, Germany.
| | - Florian Kaestner
- Department of Psychiatry, University of Münster, Münster, Germany
| | - Raik Wolf
- Center for Clinical Chemistry, Microbiology and Transfusion, Klinikum St. Georg gGmbH, Germany; Probiodrug AG, Halle, Germany
| | | | | | | | - Torsten Hoffmann
- Center for Clinical Chemistry, Microbiology and Transfusion, Klinikum St. Georg gGmbH, Germany
| | - Jens-Ulrich Rahfeld
- Fraunhofer-Institute for Cell Therapy and Immunology, Department of Drug Design and Target Validation, 06120 Halle, Germany
| | - Hans-Ulrich Demuth
- Fraunhofer-Institute for Cell Therapy and Immunology, Department of Drug Design and Target Validation, 06120 Halle, Germany
| | - Matthias Rothermundt
- Department of Psychiatry, University of Münster, Münster, Germany; St. Rochus-Hospital Telgte, 48291 Telgte, Germany
| | - Stephan von Hörsten
- Universitätsklinikum Erlangen, Department of Experimental Therapy, Erlangen, Germany.
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14
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Klemann C, Wagner L, Stephan M, von Hörsten S. Cut to the chase: a review of CD26/dipeptidyl peptidase-4's (DPP4) entanglement in the immune system. Clin Exp Immunol 2016; 185:1-21. [PMID: 26919392 DOI: 10.1111/cei.12781] [Citation(s) in RCA: 293] [Impact Index Per Article: 36.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 02/14/2016] [Accepted: 02/21/2016] [Indexed: 12/11/2022] Open
Abstract
CD26/DPP4 (dipeptidyl peptidase 4/DP4/DPPIV) is a surface T cell activation antigen and has been shown to have DPP4 enzymatic activity, cleaving-off amino-terminal dipeptides with either L-proline or L-alanine at the penultimate position. It plays a major role in glucose metabolism by N-terminal truncation and inactivation of the incretins glucagon-like peptide-1 (GLP) and gastric inhibitory protein (GIP). In 2006, DPP4 inhibitors have been introduced to clinics and have been demonstrated to efficiently enhance the endogenous insulin secretion via prolongation of the half-life of GLP-1 and GIP in patients. However, a large number of studies demonstrate clearly that CD26/DPP4 also plays an integral role in the immune system, particularly in T cell activation. Therefore, inhibition of DPP4 might represent a double-edged sword. Apart from the metabolic benefit, the associated immunological effects of long term DPP4 inhibition on regulatory processes such as T cell homeostasis, maturation and activation are not understood fully at this stage. The current data point to an important role for CD26/DPP4 in maintaining lymphocyte composition and function, T cell activation and co-stimulation, memory T cell generation and thymic emigration patterns during immune-senescence. In rodents, critical immune changes occur at baseline levels as well as after in-vitro and in-vivo challenge. In patients receiving DPP4 inhibitors, evidence of immunological side effects also became apparent. The scope of this review is to recapitulate the role of CD26/DPP4 in the immune system regarding its pharmacological inhibition and T cell-dependent immune regulation.
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Affiliation(s)
- C Klemann
- Center of Pediatric Surgery, Hannover Medical School, Hannover.,Center of Chronic Immunodeficiency, University Medical Center Freiburg, University Medical Center Freiburg
| | - L Wagner
- Deutschsprachige Selbsthilfegruppe für Alkaptonurie (DSAKU) e.V.,Department for Experimental Therapy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - M Stephan
- Clinic for Psychosomatics and Psychotherapy, Hannover Medical School, Hannover
| | - S von Hörsten
- Department for Experimental Therapy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
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15
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Wagner L, Klemann C, Stephan M, von Hörsten S. Unravelling the immunological roles of dipeptidyl peptidase 4 (DPP4) activity and/or structure homologue (DASH) proteins. Clin Exp Immunol 2016; 184:265-83. [PMID: 26671446 DOI: 10.1111/cei.12757] [Citation(s) in RCA: 75] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 12/01/2015] [Accepted: 12/14/2015] [Indexed: 12/31/2022] Open
Abstract
Dipeptidyl peptidase (DPP) 4 (CD26, DPP4) is a multi-functional protein involved in T cell activation by co-stimulation via its association with adenosine deaminase (ADA), caveolin-1, CARMA-1, CD45, mannose-6-phosphate/insulin growth factor-II receptor (M6P/IGFII-R) and C-X-C motif receptor 4 (CXC-R4). The proline-specific dipeptidyl peptidase also modulates the bioactivity of several chemokines. However, a number of enzymes displaying either DPP4-like activities or representing structural homologues have been discovered in the past two decades and are referred to as DPP4 activity and/or structure homologue (DASH) proteins. Apart from DPP4, DASH proteins include fibroblast activation protein alpha (FAP), DPP8, DPP9, DPP4-like protein 1 (DPL1, DPP6, DPPX L, DPPX S), DPP4-like protein 2 (DPL2, DPP10) from the DPP4-gene family S9b and structurally unrelated enzyme DPP2, displaying DPP4-like activity. In contrast, DPP6 and DPP10 lack enzymatic DPP4-like activity. These DASH proteins play important roles in the immune system involving quiescence (DPP2), proliferation (DPP8/DPP9), antigen-presenting (DPP9), co-stimulation (DPP4), T cell activation (DPP4), signal transduction (DPP4, DPP8 and DPP9), differentiation (DPP4, DPP8) and tissue remodelling (DPP4, FAP). Thus, they are involved in many pathophysiological processes and have therefore been proposed for potential biomarkers or even drug targets in various cancers (DPP4 and FAP) and inflammatory diseases (DPP4, DPP8/DPP9). However, they also pose the challenge of drug selectivity concerning other DASH members for better efficacy and/or avoidance of unwanted side effects. Therefore, this review unravels the complex roles of DASH proteins in immunology.
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Affiliation(s)
- L Wagner
- Deutschsprachige Selbsthilfegruppe für Alkaptonurie (DSAKU) e.V, Stuttgart.,Department for Experimental Therapy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - C Klemann
- Centre of Paediatric Surgery.,Centre for Paediatrics and Adolescent Medicine
| | - M Stephan
- Clinic for Psychosomatics and Psychotherapy, Hannover Medical School, Hannover
| | - S von Hörsten
- Department for Experimental Therapy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
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16
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Krupina NA, Khlebnikova NN. Neonatal Exposure to the Dipeptidyl Peptidase-IV Inhibitors Diprotin A and Sitagliptin Induces Depression-Like Behavior, Anxiety, and Latent Aggression in Adolescent and Adult Rats. ACTA ACUST UNITED AC 2016. [DOI: 10.4236/jbbs.2016.64018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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17
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Wagner L, Wolf R, Zeitschel U, Rossner S, Petersén Å, Leavitt BR, Kästner F, Rothermundt M, Gärtner UT, Gündel D, Schlenzig D, Frerker N, Schade J, Manhart S, Rahfeld JU, Demuth HU, von Hörsten S. Proteolytic degradation of neuropeptide Y (NPY) from head to toe: Identification of novel NPY-cleaving peptidases and potential drug interactions in CNS and Periphery. J Neurochem 2015; 135:1019-37. [PMID: 26442809 DOI: 10.1111/jnc.13378] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Revised: 09/09/2015] [Accepted: 09/14/2015] [Indexed: 01/24/2023]
Abstract
The bioactivity of neuropeptide Y (NPY) is either N-terminally modulated with respect to receptor selectivity by dipeptidyl peptidase 4 (DP4)-like enzymes or proteolytic degraded by neprilysin or meprins, thereby abrogating signal transduction. However, neither the subcellular nor the compartmental differentiation of these regulatory mechanisms is fully understood. Using mass spectrometry, selective inhibitors and histochemistry, studies across various cell types, body fluids, and tissues revealed that most frequently DP4-like enzymes, aminopeptidases P, secreted meprin-A (Mep-A), and cathepsin D (CTSD) rapidly hydrolyze NPY, depending on the cell type and tissue under study. Novel degradation of NPY by cathepsins B, D, L, G, S, and tissue kallikrein could also be identified. The expression of DP4, CTSD, and Mep-A at the median eminence indicates that the bioactivity of NPY is regulated by peptidases at the interphase between the periphery and the CNS. Detailed ex vivo studies on human sera and CSF samples recognized CTSD as the major NPY-cleaving enzyme in the CSF, whereas an additional C-terminal truncation by angiotensin-converting enzyme could be detected in serum. The latter finding hints to potential drug interaction between antidiabetic DP4 inhibitors and anti-hypertensive angiotensin-converting enzyme inhibitors, while it ablates suspected hypertensive side effects of only antidiabetic DP4-inhibitors application. The bioactivity of neuropeptide Y (NPY) is either N-terminally modulated with respect to receptor selectivity by dipeptidyl peptidase 4 (DP4)-like enzymes or proteolytic degraded by neprilysin or meprins, thereby abrogating signal transduction. However, neither the subcellular nor the compartmental differentiation of these regulatory mechanisms is fully understood. Using mass spectrometry, selective inhibitors and histochemistry, studies across various cell types, body fluids, and tissues revealed that most frequently DP4-like enzymes, aminopeptidases P, secreted meprin-A (Mep-A), and cathepsin D (CTSD) rapidly hydrolyze NPY, depending on the cell type and tissue under study. Novel degradation of NPY by cathepsins B, D, L, G, S, and tissue kallikrein could also be identified. The expression of DP4, CTSD, and Mep-A at the median eminence indicates that the bioactivity of NPY is regulated by peptidases at the interphase between the periphery and the CNS. Detailed ex vivo studies on human sera and CSF samples recognized CTSD as the major NPY-cleaving enzyme in the CSF, whereas an additional C-terminal truncation by angiotensin-converting enzyme could be detected in serum. The latter finding hints to potential drug interaction between antidiabetic DP4 inhibitors and anti-hypertensive angiotensin-converting enzyme inhibitors, while it ablates suspected hypertensive side effects of only antidiabetic DP4-inhibitors application.
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Affiliation(s)
- Leona Wagner
- Deutschsprachige Selbsthilfegruppe für Alkaptonurie (DSAKU) e.V., Stuttgart, Germany.,Probiodrug AG, Halle, Germany.,Department of Experimental Therapy, Preclinical Experimental Center, Universitätsklinikum Erlangen, Erlangen, Germany
| | | | - Ulrike Zeitschel
- Paul-Flechsig-Institute for Brain Research, University of Leipzig, Leipzig, Germany
| | - Steffen Rossner
- Paul-Flechsig-Institute for Brain Research, University of Leipzig, Leipzig, Germany
| | - Åsa Petersén
- Translational Neuroendocrine Research Unit, Lund University, Lund, Sweden
| | - Blair R Leavitt
- Department of Medical Genetics, Centre for Molecular Medicine and Therapeutics, University of British Columbia and Children's and Women's Hospital, Vancouver, BC, Canada
| | - Florian Kästner
- Department of Psychiatry, University of Muenster, Muenster, Germany
| | - Matthias Rothermundt
- Department of Psychiatry, University of Muenster, Muenster, Germany.,St. Rochus-Hospital Telgte, Telgte, Germany
| | | | - Daniel Gündel
- Julius Bernstein Institute for Physiology, Martin Luther University of Halle-Wittenberg, Halle, Germany
| | - Dagmar Schlenzig
- Fraunhofer-Institute for Cell Therapy and Immunology, Department of Drug Design and Target Validation, Halle, Germany
| | - Nadine Frerker
- Department of Experimental Therapy, Preclinical Experimental Center, Universitätsklinikum Erlangen, Erlangen, Germany
| | - Jutta Schade
- Department of Experimental Therapy, Preclinical Experimental Center, Universitätsklinikum Erlangen, Erlangen, Germany
| | | | - Jens-Ulrich Rahfeld
- Fraunhofer-Institute for Cell Therapy and Immunology, Department of Drug Design and Target Validation, Halle, Germany
| | - Hans-Ulrich Demuth
- Fraunhofer-Institute for Cell Therapy and Immunology, Department of Drug Design and Target Validation, Halle, Germany
| | - Stephan von Hörsten
- Department of Experimental Therapy, Preclinical Experimental Center, Universitätsklinikum Erlangen, Erlangen, Germany
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18
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Spasov AA, Chepljaeva NI. [Potential of pharmacological modulation of level and activity incretins on diabetes mellitus type 2]. BIOMEDIT︠S︡INSKAI︠A︡ KHIMII︠A︡ 2015; 61:488-96. [PMID: 26350740 DOI: 10.18097/pbmc20156104488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This review summarizes data on the main approaches used for the search of biologically active compounds modulating the level and physiological activity of incretins. Currently two groups of drugs are used in clinical practice: they either replenish the deficit of incretins (glucagon-like peptide-1 receptor agonists) or inhibit the degradation processes (dipeptidyl peptidase 4 inhibitors). In addition, new groups of substances are actively searched. These include non-peptide agonists of glucagon-like peptide-1 receptors, agonists/antagonists of glucose-dependent insulinotropic peptide, the hybrid polypeptides based on glucagon-like peptide-1 and glucagon.
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Affiliation(s)
- A A Spasov
- Volgograd State Medical University, Volgograd, Russia
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19
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Abstract
Dipeptidyl-peptidase 4 (DPP4) is a glycoprotein of 110 kDa, which is ubiquitously expressed on the surface of a variety of cells. This exopeptidase selectively cleaves N-terminal dipeptides from a variety of substrates, including cytokines, growth factors, neuropeptides, and the incretin hormones. Expression of DPP4 is substantially dysregulated in a variety of disease states including inflammation, cancer, obesity, and diabetes. Since the incretin hormones, glucagon-like peptide-1 and glucose-dependent insulinotropic polypeptide (GIP), are major regulators of post-prandial insulin secretion, inhibition of DPP4 by the gliptin family of drugs has gained considerable interest for the therapy of type 2 diabetic patients. In this review, we summarize the current knowledge on the DPP4–incretin axis and evaluate most recent findings on DPP4 inhibitors. Furthermore, DPP4 as a type II transmembrane protein is also known to be cleaved from the cell membrane involving different metalloproteases in a cell-type-specific manner. Circulating, soluble DPP4 has been identified as a new adipokine, which exerts both para- and endocrine effects. Recently, a novel receptor for soluble DPP4 has been identified, and data are accumulating that the adipokine-related effects of DPP4 may play an important role in the pathogenesis of cardiovascular disease. Importantly, circulating DPP4 is augmented in obese and type 2 diabetic subjects, and it may represent a molecular link between obesity and vascular dysfunction. A critical evaluation of the impact of circulating DPP4 is presented, and the potential role of DPP4 inhibition at this level is also discussed.
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Affiliation(s)
- Diana Röhrborn
- Paul-Langerhans-Group for Integrative Physiology, German Diabetes Center , Düsseldorf , Germany
| | - Nina Wronkowitz
- Paul-Langerhans-Group for Integrative Physiology, German Diabetes Center , Düsseldorf , Germany
| | - Juergen Eckel
- Paul-Langerhans-Group for Integrative Physiology, German Diabetes Center , Düsseldorf , Germany
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20
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Canneva F, Golub Y, Distler J, Dobner J, Meyer S, von Hörsten S. DPP4-deficient congenic rats display blunted stress, improved fear extinction and increased central NPY. Psychoneuroendocrinology 2015; 53:195-206. [PMID: 25635612 DOI: 10.1016/j.psyneuen.2015.01.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Revised: 01/09/2015] [Accepted: 01/09/2015] [Indexed: 12/31/2022]
Abstract
BACKGROUND Inhibitors of dipeptidyl peptidase 4 (DPP4, CD26) are used for the treatment of type 2 diabetic patients and better glucose tolerance has been confirmed in functionally DPP4-deficient congenic rats (DPP4mut), along with immunological alterations and, interestingly, a stress-resilient phenotype. All these findings are in agreement with the "moonlighting" properties of DPP4, whose proteolytic action is responsible for the inactivation of a number of regulatory peptides including, but not limited to, neuropeptide Y (NPY). Among all candidate substrates, DPP4 displays highest affinity for NPY, an endogenous anxiolytic neurotransmitter that is suggested as a candidate biomarker in post-traumatic stress disorder (PTSD) and depression. METHODS AND RESULTS Central and peripheral NPY levels were measured by ELISA in DPP4mut and DAwt rats revealing a significantly higher concentration of the peptide in the CSF of DPP4mut animals. This finding positively correlated with the blunted stress phenotype measured on an analgesia-meter. Additionally, when a classical fear-conditioning paradigm was investigated, short-term fear extinction was significantly potentiated in DPP4mut rats as compared to wt controls. CONCLUSIONS Our findings indicate a positive correlation between reduced stress-responsiveness and increased central NPY, in DPP4mut rats. Most interestingly, the behavioral phenotype extends to facilitation of fear extinction. These observations raise further interest in DPP4-modulating drugs for the potential effect on NPY metabolism, as a therapeutic tool for psychiatric conditions such as anxiety disorders and PTSD.
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Affiliation(s)
- Fabio Canneva
- Department of Experimental Therapy, Präklinisches Experimentelles Tierzentrum, Univerisitätsklinikum Erlangen, 91054 Erlangen, Germany.
| | - Yulia Golub
- Department of Child and Adolescent Mental Health, University Clinic of Erlangen, 91054 Erlangen, Germany
| | - Joerg Distler
- Department of Experimental Therapy, Präklinisches Experimentelles Tierzentrum, Univerisitätsklinikum Erlangen, 91054 Erlangen, Germany
| | - Julia Dobner
- Department of Experimental Therapy, Präklinisches Experimentelles Tierzentrum, Univerisitätsklinikum Erlangen, 91054 Erlangen, Germany
| | - Sandra Meyer
- Department of Experimental Therapy, Präklinisches Experimentelles Tierzentrum, Univerisitätsklinikum Erlangen, 91054 Erlangen, Germany
| | - Stephan von Hörsten
- Department of Experimental Therapy, Präklinisches Experimentelles Tierzentrum, Univerisitätsklinikum Erlangen, 91054 Erlangen, Germany
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21
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Effects of dipeptidyl peptidase IV inhibitor sitagliptin on immunological parameters of lymphocytes in intact animals and animals with experimental autoimmune process. Bull Exp Biol Med 2014; 158:66-9. [PMID: 25408522 DOI: 10.1007/s10517-014-2693-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2013] [Indexed: 10/24/2022]
Abstract
The effects of dipeptidyl peptidase IV inhibitor sitagliptin on immunological parameters were studied in animals with experimental autoimmune process. The effects of the drug administered in preventive (before manifestation of autoimmune processes) and therapeutic (after manifestation of autoimmune process) modes were studied.
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22
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Liu L, Omar B, Marchetti P, Ahrén B. Dipeptidyl peptidase-4 (DPP-4): Localization and activity in human and rodent islets. Biochem Biophys Res Commun 2014; 453:398-404. [PMID: 25268763 DOI: 10.1016/j.bbrc.2014.09.096] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2014] [Accepted: 09/22/2014] [Indexed: 01/26/2023]
Abstract
Dipeptidyl peptidase 4 (DPP-4) was recently found to be expressed in human and mouse islets with different expression patterns. However, whether species-dependent expression pattern is a generalized phenomenon and whether islet DPP-4 activity is regulated are not known. This study was conducted to investigate DPP-4 localization in several different species, and to examine the impact of glucose, incretin hormones, and insulin on islet DPP-4 activity. It was shown by immuofluorescent staining that there were two distinct species-specific expression patterns of islet DPP-4. The enzyme was expressed exclusively in α-cells in human and pig islets, but primarily in β-cells in mouse and rat islets. INS-1 832/13 cells also expressed DPP-4, and inhibition of DPP-4 enhanced insulin secretion in the presence of glucagon-like peptide-1 (GLP-1) in the cells. DPP-4 activity was remarkably robust when cultured with high glucose, incretin hormones, and insulin in mouse and human islets as well as INS-1 832/13 cells and islet DPP-4 activity and expression pattern was not altered in double incretin receptor knockout mice, compared to wild type mice. We conclude that islet DPP-4 is species-specifically expressed in α-cell and β-cell dominant patterns in several species and both patterns remained robust in enzyme activity during short-term metabolic challenge.
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Affiliation(s)
- Liehua Liu
- The First Affiliated Hospital of Sun Yat-sen University, Guangzhou 510080, China; Department of Clinical Sciences, Lund, Medicine, Lund University, SE22184 Lund, Sweden
| | - Bilal Omar
- Department of Clinical Sciences, Lund, Medicine, Lund University, SE22184 Lund, Sweden
| | - Piero Marchetti
- Department of Clinical and Experimental Medicine, Islet Cell Laboratory, University of Pisa, 56126 Pisa, Italy
| | - Bo Ahrén
- Department of Clinical Sciences, Lund, Medicine, Lund University, SE22184 Lund, Sweden.
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23
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Tasic T, Stephan M, von Hörsten S, Pabst R, Schmiedl A. Differential OVA-induced pulmonary inflammation and unspecific reaction in Dark Agouti (DA) rats contingent on CD26/DPPIV deficiency. Immunobiology 2014; 219:888-900. [PMID: 25108564 DOI: 10.1016/j.imbio.2014.07.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Revised: 06/20/2014] [Accepted: 07/15/2014] [Indexed: 12/17/2022]
Abstract
Many disease models have shown that, within the species rat, different strains are differentially susceptible to asthma-induced inflammation depending on the genetic background. Likewise, CD26/DPPIV-deficiency in asthmatic F344 rats has been shown to result in a less pronounced inflammation and in increased Treg cell influx into the lung compared to wild-types. The aim of the present study was to investigate whether the genetic background of the animals interferes with CD26/DPPIV-deficiency in a model of allergic-like inflammation, or whether the deficiency per se is the predominant regulator of the inflammation. Therefore, we hypothesised that CD26/DPPIV-deficient Dark Agouti (DA) rats also exhibit a less pronounced ovalbumin (OVA)-induced inflammation compared to wild-types. After sensitisation with OVA, Al(OH)3 and heat-killed Bordetella pertussis bacilli, animals were challenged three times with 5% aerosolized OVA at intervals of 24h, i.e., on three consecutive days. 24h after the third challenge, animals were sacrificed and examined. In both wild-type and CD26/DPPIV-deficient rat groups, asthma induction led to (1) lung inflammation, (2) significantly increased eosinophil infiltration in the BALF, (3) significantly increased IgE serum levels, (4) a significant increase of inflammatory cytokines, (5) a significant increase of different T cell populations in the lungs and in their draining lymph nodes, as well as to (6) a significantly higher number of all T lymphocyte subtypes in the blood. Thus, the degree of the OVA-induced Th2-driven pulmonary inflammation was similarly pronounced in both wild-type and CD26/DPPIV-deficient DA rats.
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Affiliation(s)
- Tihana Tasic
- Institute of Functional and Applied Anatomy, Hannover Medical School, Germany
| | - Michael Stephan
- Clinic for Psychosomatics and Psychotherapy, Hannover Medical School, Germany
| | - Stephan von Hörsten
- Department for Experimental Therapy, Franz-Penzoldt-Center, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
| | - Reinhard Pabst
- Institute of Immunomorphology, Hannover Medical School, Germany
| | - Andreas Schmiedl
- Institute of Functional and Applied Anatomy, Hannover Medical School, Germany.
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Urbach YK, Raber KA, Canneva F, Plank AC, Andreasson T, Ponten H, Kullingsjö J, Nguyen HP, Riess O, von Hörsten S. Automated phenotyping and advanced data mining exemplified in rats transgenic for Huntington's disease. J Neurosci Methods 2014; 234:38-53. [PMID: 25020253 DOI: 10.1016/j.jneumeth.2014.06.017] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Revised: 06/13/2014] [Accepted: 06/16/2014] [Indexed: 02/05/2023]
Abstract
BACKGROUND The need for improving throughput, validity, and reliability in the behavioral characterization of rodents may benefit from integrating automated intra-home-cage-screening systems allowing the simultaneous detection of multiple behavioral and physiological parameters in parallel. NEW METHOD To test this hypothesis, transgenic Huntington's disease (tgHD) rats were repeatedly screened within phenotyping home-cages (PhenoMaster and IntelliCage for rats), where spontaneous activity, feeding, drinking, temperature, and metabolic performance were continuously measured. Cognition and emotionality were evaluated within the same environment by means of operant learning procedures and refined analysis of the behavioral display under conditions of novelty. This investigator-independent approach was further correlated with behavioral display of the animals in classical behavioral assays. Multivariate analysis (MVA) including Principle Component Analysis (PCA) and Partial Least Squares Discriminant Analysis (PLS-DA) was used to explore correlation patterns of variables within and across the two genotypes. RESULTS The automated systems traced previously undetected aspects in the phenotype of tgHD rats (circadian activity, energy metabolism, rearing), and out of those spontaneous free rearing correlated with individual performance in the accelerod test. PCA revealed a segregation by genotype in juvenile tgHD rats that differed from adult animals, being further resolved by PLS-DA detecting "temperature" (juvenile) and "rearing" (adult) as phenotypic key variables in the tgHD model. CONCLUSIONS Intra-home-cage phenotyping in combination with MVA, is capable of characterizing a complex phenotype by detecting novel physiological and behavioral markers with high sensitivity and standardization using fewer human resources. A broader application of automated systems for large-scale screening is encouraged.
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Affiliation(s)
- Yvonne K Urbach
- Experimental Therapy, Preclinical Experimental Center, Universitätsklinikum Erlangen, 91054 Erlangen, Germany
| | - Kerstin A Raber
- Experimental Therapy, Preclinical Experimental Center, Universitätsklinikum Erlangen, 91054 Erlangen, Germany
| | - Fabio Canneva
- Experimental Therapy, Preclinical Experimental Center, Universitätsklinikum Erlangen, 91054 Erlangen, Germany
| | - Anne-C Plank
- Experimental Therapy, Preclinical Experimental Center, Universitätsklinikum Erlangen, 91054 Erlangen, Germany
| | - Theresa Andreasson
- NeuroSearch Sweden AB, Arvid Wallgrens Backe 20, 41346 Gothenburg, Sweden
| | - Henrik Ponten
- NeuroSearch Sweden AB, Arvid Wallgrens Backe 20, 41346 Gothenburg, Sweden
| | - Johan Kullingsjö
- NeuroSearch Sweden AB, Arvid Wallgrens Backe 20, 41346 Gothenburg, Sweden
| | - Huu Phuc Nguyen
- Department of Medical Genetics, University of Tübingen, 72076 Tübingen, Germany
| | - Olaf Riess
- Department of Medical Genetics, University of Tübingen, 72076 Tübingen, Germany
| | - Stephan von Hörsten
- Experimental Therapy, Preclinical Experimental Center, Universitätsklinikum Erlangen, 91054 Erlangen, Germany.
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Wang Z, Grigo C, Steinbeck J, von Hörsten S, Amann K, Daniel C. Soluble DPP4 originates in part from bone marrow cells and not from the kidney. Peptides 2014; 57:109-17. [PMID: 24874705 DOI: 10.1016/j.peptides.2014.05.006] [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: 12/04/2013] [Revised: 05/15/2014] [Accepted: 05/15/2014] [Indexed: 12/12/2022]
Abstract
Dipeptidyl peptidase 4 (DPP4) is known to inactivate incretins as well as important chemokines and neuropeptides. DPP4 is expressed as a transmembrane protein but also occurs as a soluble enzyme circulating in the blood. However, the origin of the soluble DPP4 (sDPP4) is still unknown. In this study, DPP4 activity was quantified in plasma and extracted from different rat organs. Then, in order to see if the kidney or the bone marrow was the source of sDPP4, kidney or bone marrow transplantation was performed between wildtype (wt) Dark Agouti (DA) and DPP4 deficient congenic rats (n=6-9). Kidney was verified to have the highest DPP4 activity, followed by spleen and lung. In the following three weeks after successful kidney transplantation only transient trace plasma DPP4 activity was detected in DPP4 deficient rats receiving wt kidneys. In addition, DPP4 activity was not diminished in DA wt rats receiving DPP4 deficient kidneys. Both findings indicated that sDPP4 did not originate from the kidney. In contrast, 43±14% (compared to wt) sDPP4 activity was detected in the plasma of DPP4 deficient DA rats that were reconstituted with wt bone marrow cells. Not only leukocyte but also macrophage subpopulations express DPP4 in bone marrow as well as in blood as assessed by flow cytometry. Thus, bone marrow derived cells but not the kidney represent at least one source of sDPP4. And leukocyte or macrophage subpopulations could be potential candidates.
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Affiliation(s)
- Zhendi Wang
- Department of Nephrology and Hypertension, University of Erlangen-Nürnberg, Loschgestr. 8, 91054 Erlangen, Germany; Department of Urologic Surgery, Union Hospital, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan 430022, PR China.
| | - Christina Grigo
- Division of Nephropathology, University of Erlangen-Nürnberg, Krankenhausstr. 8-10, 91054 Erlangen, Germany.
| | - Julia Steinbeck
- Division of Nephropathology, University of Erlangen-Nürnberg, Krankenhausstr. 8-10, 91054 Erlangen, Germany.
| | - Stephan von Hörsten
- Department for Experimental Therapy, Friedrich-Alexander Universität Erlangen-Nürnberg, Palmsanlage 5, 91054 Erlangen, Germany.
| | - Kerstin Amann
- Division of Nephropathology, University of Erlangen-Nürnberg, Krankenhausstr. 8-10, 91054 Erlangen, Germany.
| | - Christoph Daniel
- Division of Nephropathology, University of Erlangen-Nürnberg, Krankenhausstr. 8-10, 91054 Erlangen, Germany.
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Hupa KL, Schmiedl A, Pabst R, Von Hörsten S, Stephan M. Maternal Deprivation Decelerates Postnatal Morphological Lung Development of F344 Rats. Anat Rec (Hoboken) 2013; 297:317-26. [DOI: 10.1002/ar.22848] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Accepted: 11/07/2013] [Indexed: 01/02/2023]
Affiliation(s)
- Katharina Luise Hupa
- Institute of Functional and Applied Anatomy; Hannover Medical School; Hannover Germany
| | - Andreas Schmiedl
- Institute of Functional and Applied Anatomy; Hannover Medical School; Hannover Germany
| | - Reinhard Pabst
- Institute of Immunomorphology; Hannover Medical School; Hannover Germany
| | - Stephan Von Hörsten
- Department for Experimental Therapy; Franz-Penzoldt-Center, Friedrich-Alexander-University Erlangen-Nürnberg; Erlangen Germany
| | - Michael Stephan
- Clinic for Psychosomatics and Psychotherapy; Hannover Medical School; Hannover Germany
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Effect of Prolyl Endopeptidase Inhibitor Benzyloxycarbonyl-Methionyl-2(S)-Cyanopyrrolidine on Activity of Proline-Specific Peptidases in Brain Structures of Rats with Experimental MPTP-Induced Depressive Syndrome. Bull Exp Biol Med 2013; 155:711-4. [DOI: 10.1007/s10517-013-2233-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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28
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Herlihy SE, Pilling D, Maharjan AS, Gomer RH. Dipeptidyl peptidase IV is a human and murine neutrophil chemorepellent. THE JOURNAL OF IMMUNOLOGY 2013; 190:6468-77. [PMID: 23677473 DOI: 10.4049/jimmunol.1202583] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
In Dictyostelium discoideum, AprA is a secreted protein that inhibits proliferation and causes chemorepulsion of Dictyostelium cells, yet AprA has little sequence similarity to any human proteins. We found that a predicted structure of AprA has similarity to human dipeptidyl peptidase IV (DPPIV). DPPIV is a serine protease present in extracellular fluids that cleaves peptides with a proline or alanine in the second position. In Insall chambers, DPPIV gradients below, similar to, and above the human serum DPPIV concentration cause movement of human neutrophils away from the higher concentration of DPPIV. A 1% DPPIV concentration difference between the front and back of the cell is sufficient to cause chemorepulsion. Neutrophil speed and viability are unaffected by DPPIV. DPPIV inhibitors block DPPIV-mediated chemorepulsion. In a murine model of acute respiratory distress syndrome, aspirated bleomycin induces a significant increase in the number of neutrophils in the lungs after 3 d. Oropharyngeal aspiration of DPPIV inhibits the bleomycin-induced accumulation of mouse neutrophils. These results indicate that DPPIV functions as a chemorepellent of human and mouse neutrophils, and they suggest new mechanisms to inhibit neutrophil accumulation in acute respiratory distress syndrome.
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Affiliation(s)
- Sarah E Herlihy
- Department of Biology, Texas A&M University, College Station, TX 77843, USA
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29
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Schosser A, Gaysina D, Cohen-Woods S, Domenici E, Perry J, Tozzi F, Korszun A, Gunasinghe C, Gray J, Jones L, Binder EB, Holsboer F, Craddock N, Owen MJ, Craig IW, Farmer AE, Muglia P, McGuffin P. A follow-up case-control association study of tractable (druggable) genes in recurrent major depression. Am J Med Genet B Neuropsychiatr Genet 2011; 156B:640-50. [PMID: 21630437 DOI: 10.1002/ajmg.b.31204] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2010] [Accepted: 04/25/2011] [Indexed: 12/20/2022]
Abstract
The High-Throughput Disease-specific target Identification Program (HiTDIP) aimed to study case-control association samples for 18 common diseases. Here we present the results of a follow-up case-control association study of HiTDIP in major depressive disorder (MDD). The HiTDIP in MDD was conducted in a sample of 974 cases of recurrent MDD of white German origin collected at the Max-Planck Institute (MP-GSK) and 968 ethnically matched controls screened for lifetime absence of depression. Six genes were identified as of interest for a follow-up, based on the strength of the association and based on the interest as potential candidate target for developing new treatment for depression: Solute Carrier Family 4 Member 10 (SLC4A10), Dipeptidyl Peptidase IV (DPP4), Dopamine Receptor D3 (DRD3), Zinc Finger Protein 80 (ZNF80), Nitric Oxide Synthase 2A (NOS2A) and Peroxisome Proliferator-Activated Receptor-Gamma, Coactivator 1, Alpha (PPARGC1A). Within the current study, we attempted to follow-up these findings in a sample from the UK, the Depression Case Control (DeCC) sample consisting of 1,196 cases and 842 screened controls, phenotyped using exactly the same methods as the MP-GSK sample. Performing Cochran-Mantel-Haenzel statistics to test for genotypic and/or allelic differences between the DeCC and MP-GSK samples, we found no significant differences, thus being able to combine the two samples for association testing. In the combined sample of 2,170 MDD cases and 1,810 controls, there were positive findings in the Nitric Oxide Synthase 2A (NOS2A) gene both using single SNP analysis and haplotype analysis.
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Affiliation(s)
- A Schosser
- MRC SGDP Centre, Institute of Psychiatry, King's College London, De Crespigny Park, UK.
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Tasic T, Bäumer W, Schmiedl A, Schwichtenhövel F, Pabst R, Raap U, von Hörsten S, Stephan M. Dipeptidyl peptidase IV (DPP4) deficiency increases Th1-driven allergic contact dermatitis. Clin Exp Allergy 2011; 41:1098-107. [PMID: 21672052 DOI: 10.1111/j.1365-2222.2011.03778.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND CD26 or dipeptidyl peptidase IV (DPP4) is known to be involved in several immunological processes and has recently been reported to play a crucial role in the allergic responses of the lungs. OBJECTIVES To explore the impact of DPP4 on the allergic response of the skin. METHODS Skin biopsies from patients suffering from atopic dermatitis (AD) and healthy controls were investigated for the expression of CD26/DPP4. Furthermore, the functional impact of CD26 was investigated in two models of contact hypersensitivity using CD26/DPP4-deficient and wild-type rats. Dinitrochlorobenzene (DNCB) was used to induce a T helper type 1 (Th1)-dominated inflammation and toluene-2,3-diisocyanate for a Th2-pronounced inflammation. The inflammatory responses were determined by histological quantification, flow cytometry [fluorescence-activated cell sorting (FACS)], and an enzyme-linked immunosorbant assay (ELISA). RESULTS CD26/DPP4-expression was up-regulated in the lesional skin biopsies of patients compared with healthy controls as well as in both models of contact hypersensitivity. However, in the more Th2-driven model, a reduced inflammatory skin response was found in CD26/DPP4-deficient rats, analogous to the effects observed recently in a rat model of asthma. In partial contrast, there was an aggravation of local skin inflammation in CD26/DPP4-deficient rats under conditions of Th1-like skin inflammation. CONCLUSION AND CLINICAL RELEVANCE The up-regulation of CD26 in atopic dermatitis represents a new finding, which has also been seen in other inflammatory skin diseases. However, tissue expression of CD26/DPP4 in immunological skin response can either be beneficial or aggravating, depending on a possible Th1/Th2 shift. This might have consequences for humans suffering from diabetes mellitus treated by DPP4 inhibitors, who have eczematous skin diseases as a co-morbidity.
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Affiliation(s)
- T Tasic
- Institute of Functional and Applied Anatomy, Hannover Medical School, Hannover, Germany
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