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Ouassou H, Elhouda Daoudi N, Bouknana S, Abdnim R, Bnouham M. A Review of Antidiabetic Medicinal Plants as a Novel Source of Phosphodiesterase Inhibitors: Future Perspective of New Challenges Against Diabetes Mellitus. Med Chem 2024; 20:467-486. [PMID: 38265379 DOI: 10.2174/0115734064255060231116192839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 07/31/2023] [Accepted: 09/25/2023] [Indexed: 01/25/2024]
Abstract
Intracellular glucose concentration plays a crucial role in initiating the molecular secretory process of pancreatic β-cells through multiple messengers and signaling pathways. Cyclic nucleotides are key physiological regulators that modulate pathway interactions in β -cells. An increase of cyclic nucleotides is controled by hydrolysed phosphodiesterases (PDEs), which degrades cyclic nucleotides into inactive metabolites. Despite the undeniable therapeutic potential of PDE inhibitors, they are associated with several side effects. The treatment strategy for diabetes based on PDE inhibitors has been proposed for a long time. Hence, the world of natural antidiabetic medicinal plants represents an ideal source of phosphodiesterase inhibitors as a new strategy for developing novel agents to treat diabetes mellitus. This review highlights medicinal plants traditionally used in the treatment of diabetes mellitus that have been proven to have inhibitory effects on PDE activity. The contents of this review were sourced from electronic databases, including Science Direct, PubMed, Springer Link, Web of Science, Scopus, Wiley Online, Scifinder and Google Scholar. These databases were consulted to collect information without any limitation date. After comprehensive literature screening, this paper identified 27 medicinal plants that have been reported to exhibit anti-phosphodiesterase activities. The selection of these plants was based on their traditional uses in the treatment of diabetes mellitus. The review emphasizes the antiphosphodiesterase properties of 31 bioactive components derived from these plant extracts. Many phenolic compounds have been identified as PDE inhibitors: Brazilin, mesozygin, artonin I, chalcomaracin, norartocarpetin, moracin L, moracin M, moracin C, curcumin, gallic acid, caffeic acid, rutin, quercitrin, quercetin, catechin, kaempferol, chlorogenic acid, and ellagic acid. Moreover, smome lignans have reported as PDE inhibitors: (+)-Medioresinol di-O-β-d-glucopyranoside, (+)- Pinoresinol di-O-β-d-glucopyranoside, (+)-Pinoresinol-4-O-β-d-glucopyranosyl (1→6)-β-dglucopyranoside, Liriodendrin, (+)-Pinoresinol 4'-O-β-d-glucopyranoside, and forsythin. This review provides a promising starting point of medicinal plants, which could be further studied for the development of natural phosphodiesterase inhibitors to treat diabetes mellitus. Therefore, it is important to consider clinical studies for the identification of new targets for the treatment of diabetes.
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Affiliation(s)
- Hayat Ouassou
- Higher Institute of Nurses Professions and Health Techniques, Oujda 60000, Morocco
- Laboratory of Bioresources, Biotechnology, Ethnopharmacology and Health, Department of Biology, Faculty of Sciences, Mohammed First University, BP. 717, Oujda 60040, Morocco
| | - Nour Elhouda Daoudi
- Laboratory of Bioresources, Biotechnology, Ethnopharmacology and Health, Department of Biology, Faculty of Sciences, Mohammed First University, BP. 717, Oujda 60040, Morocco
| | - Saliha Bouknana
- Department of Biology, Faculty of Sciences, University Mohammed First, Boulevard Mohamed VI BP 717, Oujda 60040, Morocco
| | - Rhizlan Abdnim
- Laboratory of Bioresources, Biotechnology, Ethnopharmacology and Health, Department of Biology, Faculty of Sciences, Mohammed First University, BP. 717, Oujda 60040, Morocco
| | - Mohamed Bnouham
- Laboratory of Bioresources, Biotechnology, Ethnopharmacology and Health, Department of Biology, Faculty of Sciences, Mohammed First University, BP. 717, Oujda 60040, Morocco
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Elumalai S, Karunakaran U, Won KC, Chung SM, Moon JS. Perfluorooctane sulfonate-induced oxidative stress contributes to pancreatic β-cell apoptosis by inhibiting cyclic adenosine monophosphate pathway: Prevention by pentoxifylline. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 320:120959. [PMID: 36621715 DOI: 10.1016/j.envpol.2022.120959] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Revised: 12/18/2022] [Accepted: 12/26/2022] [Indexed: 06/17/2023]
Abstract
Endocrine-disrupting chemical perfluorooctane sulfonate (PFOS) acute exposure stimulates insulin secretion from pancreatic β-cells. However, chronic exposure to PFOS on pancreatic β-cells, its role in insulin secretion, and the underlying mechanisms have not been studied. We used rat insulinoma INS-1 and human 1.1b4 islet cells to investigate the chronic effects of PFOS on glucose-stimulated insulin secretion and toxicity implicated in the downregulation of β-cell functionality. Chronic exposure of INS-1 cells or human pancreatic 1.1b4 β-cells to PFOS stimulated the small G-protein RAC1-guanosine triphosphate-dependent nicotinamide adenine dinucleotide phosphate oxidase (NOX2/gp91phox) subunit expression and activation. Upregulated NOX2/gp91phox activation led to elevated reactive oxygen species (ROS) production with a decrease in the cyclic adenosine monophosphate/protein kinase A (cAMP/PKA) pathway in both cell types. Inhibition of cAMP/PKA signaling induces β-cell mitochondrial dysfunction and endoplasmic stress via the loss of PDX1-SERCA2B and glucose-stimulated insulin release. Inhibiting RAC1-NOX2/gp91phox activation or elevating cAMP by pentoxifylline, a Food and Drug Administration-approved phosphodiesterase inhibitor, significantly reduced PFOS-induced ROS production and restored insulin secretory function of pancreatic β-cells. Enhanced secretory function in pentoxifylline-treated cells was associated with increased stability of PDX1-SERCA2B protein levels. Intriguingly, inhibition of cAMP/PKA signaling impaired pentoxifylline-induced insulin secretion caused by the activation of ROS production and mitochondrial dysfunction. Overall, our findings show that PFOS has a new and first-ever direct chronic effect on pancreatic β-cell failure through increased RAC1-NOX2/gp91phox activation and pentoxifylline-induced cAMP/PKA signaling, which inhibits PFOS-mediated mitochondrial dysfunction.
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Affiliation(s)
- Suma Elumalai
- Innovative Center for Aging Research, Yeungnam University Medical Center, Daegu, Republic of Korea
| | - Udayakumar Karunakaran
- Innovative Center for Aging Research, Yeungnam University Medical Center, Daegu, Republic of Korea
| | - Kyu Chang Won
- Innovative Center for Aging Research, Yeungnam University Medical Center, Daegu, Republic of Korea; Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Republic of Korea
| | - Seung Min Chung
- Innovative Center for Aging Research, Yeungnam University Medical Center, Daegu, Republic of Korea; Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Republic of Korea
| | - Jun Sung Moon
- Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Republic of Korea.
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Yong M, Burns KE, de Zoysa J, Helsby NA. Intracellular activation of 4-hydroxycyclophosphamide into a DNA-alkylating agent in human leucocytes. Xenobiotica 2021; 51:1188-1198. [PMID: 34470569 DOI: 10.1080/00498254.2021.1975060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
1.The conversion of the cyclophosphamide intermediate metabolite 4-hydroxycyclophosphamide (4-OHCP) to the final cytotoxic metabolite phosphoramide mustard (PAM) is classically assumed to occur via chemical hydrolysis of the phospho-ester bond. Whilst it has been suggested previously that this reaction could be enzyme-catalysed, there was only indirect evidence for this (i.e. formation of the by-product acrolein).2. Using an assay to detect formation of DNA-alkylating adducts which block PCR amplification (QPCR-block assay), we have demonstrated that 4-OHCP can be activated by peripheral blood mononuclear cells (PBMC). The DNA-alkylating potency of 4-OHCP in PBMC increased >18-fold compared to the intrinsic reactivity of 4-OHCP for purified gDNA.3. We also found that immortalised T-cells (Jurkat) had a similar ability to activate 4-OHCP into a DNA alkylating agent, whereas there was no appreciable activation in epithelial derived (Caco-2) cells. This suggests the possibility of tissue-specific enzyme expression.4. Of the candidate enzymes tested only recombinant human cAMP-phosphodiesterase-PDE4B and snake-venom phosphodiesterase (PDE-I) could catalyse this activation into a DNA-alkylating agent.5. This enzymatic catalysis of the phospho-ester bond (P-O-C) is a hitherto unrecognised feature of this important immunomodulatory drug and should be investigated further.
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Affiliation(s)
- Minghan Yong
- The University of Auckland Faculty of Medical and Health Sciences, Molecular Medicine and Pathology, Auckland, New Zealand
| | - Kathryn Elisa Burns
- The University of Auckland Faculty of Medical and Health Sciences, Molecular Medicine and Pathology, Auckland, New Zealand
| | - Janak de Zoysa
- North Shore Hospital, Waitemata District Health Board, Auckland, New Zealand.,Faculty of Medical and Health Sciences, The University of Auckland School of Medicine, Auckland, New Zealand
| | - Nuala Ann Helsby
- The University of Auckland Faculty of Medical and Health Sciences, Molecular Medicine and Pathology, Auckland, New Zealand
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Kilanowska A, Ziółkowska A. Role of Phosphodiesterase in the Biology and Pathology of Diabetes. Int J Mol Sci 2020; 21:E8244. [PMID: 33153226 PMCID: PMC7662747 DOI: 10.3390/ijms21218244] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 10/27/2020] [Accepted: 10/28/2020] [Indexed: 12/12/2022] Open
Abstract
Glucose metabolism is the initiator of a large number of molecular secretory processes in β cells. Cyclic nucleotides as a second messenger are the main physiological regulators of these processes and are functionally divided into compartments in pancreatic cells. Their intracellular concentration is limited by hydrolysis led by one or more phosphodiesterase (PDE) isoenzymes. Literature data confirmed multiple expressions of PDEs subtypes, but the specific roles of each in pancreatic β-cell function, particularly in humans, are still unclear. Isoforms present in the pancreas are also found in various tissues of the body. Normoglycemia and its strict control are supported by the appropriate release of insulin from the pancreas and the action of insulin in peripheral tissues, including processes related to homeostasis, the regulation of which is based on the PDE- cyclic AMP (cAMP) signaling pathway. The challenge in developing a therapeutic solution based on GSIS (glucose-stimulated insulin secretion) enhancers targeted at PDEs is the selective inhibition of their activity only within β cells. Undeniably, PDEs inhibitors have therapeutic potential, but some of them are burdened with certain adverse effects. Therefore, the chance to use knowledge in this field for diabetes treatment has been postulated for a long time.
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Affiliation(s)
| | - Agnieszka Ziółkowska
- Department of Anatomy and Histology, Collegium Medicum, University of Zielona Gora, Zyty 28, 65-046 Zielona Gora, Poland;
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TNF-α inhibition decreases MMP-2 activity, reactive oxygen species formation and improves hypertensive vascular hypertrophy independent of its effects on blood pressure. Biochem Pharmacol 2020; 180:114121. [PMID: 32592722 DOI: 10.1016/j.bcp.2020.114121] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 05/28/2020] [Accepted: 06/22/2020] [Indexed: 02/07/2023]
Abstract
Systemic arterial hypertension is a public health problem associated with an increased risk of cardiovascular disease. Matrix metalloproteinases (MMP) are endopeptidases that participate in hypertension-induced cardiovascular remodeling, which may be activated by oxidative stress. Angiotensin II (Ang II), a potent hypertrophic and vasoconstrictor peptide, increases oxidative stress, MMP-2 activity and tumor necrosis factor (TNF-α) expression. In vitro studies have shown that TNF-α is essential for Ang II-induced MMP-2 expression. Thus, this study evaluated whetherTNF-α inhibition decreases the development of hypertension-induced vascular remodeling via reduction of MMP-2 activity and reactive oxygen species (ROS) formation. Two distinct pharmacological approaches were used in the present study: Pentoxifylline (PTX), a non-selective inhibitor of phosphodiesterases that exerts anti- inflammatory effects via inhibition of TNF-α, and Etanercept (ETN), a selective TNF-α inhibitor. 2-kidney and 1-Clip (2K1C). 2-kidney and 1-Clip (2K1C) and Sham rats were treated with Vehicle, PTX (50 mg/Kg and 100 mg/kg daily) or ETN (0.3 mg/Kg and 1 mg/kg; three times per week). Systolic blood pressure (SBP) was measured weekly by tail cuff plethysmography. Plasma TNF-α and IL-1β levels were evaluated by enzyme-linked immunosorbent assay (ELISA) technique. The vascular hypertrophy was examined in the aorta sections stained with hematoxylin/eosin. ROS in aortas was evaluated by dihydroethidium and chemiluminescence lucigenin assay. Aortic MMP-2 levels and activity were evaluated by gel zymography and in situ zymography, respectively. The 2K1C animals showed a progressive increase in SBP levels and was accompanied by significant vascular hypertrophy (p < 0.05 vs Sham). Treatment with PTX at higher doses decreased SBP and vascular remodeling in 2K1C animals (p < 0.05 vs 2K1C vehicle). Although the highest dose of ETN treatment did not reduce blood pressure, the vascular hypertrophy was significantly attenuated in 2K1C animals treated with ETN1 (p < 0.05). The increased cytokine levels and ROS formation were reversed by the highest doses of both PTX and ETN. The increase in MMP-2 levels and activity in 2K1C animals were reduced by PTX100 and ETN1 treatments (p < 0.05 vs vehicle 2K1C). Lower doses of PTX and ETN did not affect any of the evaluated parameters in this study, except for a small reduction in TNF-α levels. The findings of the present study suggest that PTX and ETN treatment exerts immunomodulatory effects, blunted excessive ROS formation, and decreased renovascular hypertension-induced MMP-2 up-regulation, leading to improvement ofvascular remodeling typically found in 2K1C hypertension. Therefore, strategies using anti-hypertensive drugs in combination with TNF alpha inhibitors could be an attractive therapeutic approach to tackle hypertension and its associated vascular remodeling.
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Phosphodiesterase-4B as a Therapeutic Target for Cognitive Impairment and Obesity-Related Metabolic Diseases. ADVANCES IN NEUROBIOLOGY 2017; 17:103-131. [DOI: 10.1007/978-3-319-58811-7_5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Hashemi J, Hashemi-Najafabadi S, Vasheghani-Farahani E. Synergistic effect of PEGylation and pentoxifylline addition on immunoprotection of pancreatic islets. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2016; 28:33-49. [PMID: 27683968 DOI: 10.1080/09205063.2016.1239952] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
In this study, a method is proposed to reduce immunological response of immune system against Langerhans islets by PEGylation of islets combined with adjuvant therapy. For this purpose, the best composition for a mixture of succinimidyl valeric acid activated mPEG (mPEG-SVA) with different molecular weights (MWs) and for a mixture of succinimidyl carbonate activated mPEG (mPEG-SC) with different MWs was determined separately. Then, the effect of pentoxifylline (PTX) as an adjuvant drug on immunological response against PEGylated islets at best mPEG composition was studied. The extent of mPEGs reaction, the amount of interlukin-2 (IL-2) and perforin secretion, and the viability of lymphocytes and islets in homo and co-cultures in the presence of PTX at different concentrations were considered for the in vitro evaluation of the proposed method. It was found, that a mixture of mPEG-SVA with MWs of 10 and 5 kDa at a composition of 75 and 25%, respectively, was the best formulation. Also, the addition of PTX drug to co-culture medium increased the protection of PEGylated islets against immune system and a concentration of 75 μg mL-1 of PTX was suitable for islet protection with no adverse effect on immune cells.
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Affiliation(s)
- Javad Hashemi
- a Biomedical Engineering Division, Faculty of Chemical Engineering , Tarbiat Modares University , Tehran , Iran
| | - Sameereh Hashemi-Najafabadi
- a Biomedical Engineering Division, Faculty of Chemical Engineering , Tarbiat Modares University , Tehran , Iran
| | - Ebrahim Vasheghani-Farahani
- a Biomedical Engineering Division, Faculty of Chemical Engineering , Tarbiat Modares University , Tehran , Iran
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Elliott AD, Ustione A, Piston DW. Somatostatin and insulin mediate glucose-inhibited glucagon secretion in the pancreatic α-cell by lowering cAMP. Am J Physiol Endocrinol Metab 2015; 308:E130-43. [PMID: 25406263 PMCID: PMC4297778 DOI: 10.1152/ajpendo.00344.2014] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The dysregulation of glucose-inhibited glucagon secretion from the pancreatic islet α-cell is a critical component of diabetes pathology and metabolic disease. We show a previously uncharacterized [Ca(2+)]i-independent mechanism of glucagon suppression in human and murine pancreatic islets whereby cAMP and PKA signaling are decreased. This decrease is driven by the combination of somatostatin, which inhibits adenylyl cyclase production of cAMP via the Gαi subunit of the SSTR2, and insulin, which acts via its receptor to activate phosphodiesterase 3B and degrade cytosolic cAMP. Our data indicate that both somatostatin and insulin signaling are required to suppress cAMP/PKA and glucagon secretion from both human and murine α-cells, and the combination of these two signaling mechanisms is sufficient to reduce glucagon secretion from isolated α-cells as well as islets. Thus, we conclude that somatostatin and insulin together are critical paracrine mediators of glucose-inhibited glucagon secretion and function by lowering cAMP/PKA signaling with increasing glucose.
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Affiliation(s)
- Amicia D Elliott
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, Tennessee
| | - Alessandro Ustione
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, Tennessee
| | - David W Piston
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, Tennessee
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Pugazhenthi U, Velmurugan K, Tran A, Mahaffey G, Pugazhenthi S. Anti-inflammatory action of exendin-4 in human islets is enhanced by phosphodiesterase inhibitors: potential therapeutic benefits in diabetic patients. Diabetologia 2010; 53:2357-68. [PMID: 20635178 DOI: 10.1007/s00125-010-1849-y] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2010] [Accepted: 06/14/2010] [Indexed: 12/16/2022]
Abstract
AIMS/HYPOTHESIS Exendin-4, a glucagon-like peptide-1 (GLP-1) analogue, is reported to have modest anti-inflammatory effects in addition to that of improving beta cell survival. We therefore sought to determine whether exendin-4 decreases expression of the gene encoding chemokine (C-X-C motif) ligand (CXCL)10, which plays a role in initiating insulitis in type 1 diabetes. METHODS The expression of CXCL10 in human islets was determined at the mRNA level by real-time RT-PCR analysis and at the protein level by western blotting. The level of CXCL10 in culture medium was measured by ELISA. Pathway-specific gene expression profiling was carried out to determine the expression of a panel of genes encoding chemokines and cytokines in human islets exposed to cytokines. RESULTS IFN-γ induced expression of CXCL10 through activation of signal transducer and activator of transcription-1 (STAT-1). A combination of cytokines (IL-1β, TNF-α and IFN-γ) showed strong synergy in the induction of numerous chemokines and cytokines through nuclear factor kappa B and STAT-1. Exendin-4 suppressed basal expression of several inflammatory mediators. In combination with phosphodiesterase inhibitors, exendin-4 also decreased IFN-γ-induced CXCL10 expression in human islets and in MIN6 cells (a mouse beta cell line), and its secretion into the culture medium. Exendin-4 action was mimicked by forskolin, an activator of adenylyl cyclase, and by dibutyryl cyclic AMP. Protein kinase A was not involved in mediating exendin-4 action on CXCL10. The mechanism of exendin-4's anti-inflammatory action involved decreases in STAT-1 levels. CONCLUSIONS/INTERPRETATION These findings suggest that the GLP-1-cyclic AMP pathway decreases islet inflammation in addition to its known effects on beta cell survival.
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Affiliation(s)
- U Pugazhenthi
- Department of Medicine, University of Colorado Denver, Mail Stop 8106, 12801 E 17th Ave, Aurora, CO 80045, USA
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Bielekova B, Richert N, Howard T, Packer AN, Blevins G, Ohayon J, McFarland HF, Stürzebecher CS, Martin R. Treatment with the phosphodiesterase type-4 inhibitor rolipram fails to inhibit blood--brain barrier disruption in multiple sclerosis. Mult Scler 2009; 15:1206-14. [PMID: 19776093 PMCID: PMC3085182 DOI: 10.1177/1352458509345903] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Rolipram, a prototypic phosphodiesterase-4 inhibitor, is highly effective in suppressing Th1 autoimmunity in multiple animal models, including experimental autoimmune encephalomyelitis. In addition, rolipram has been extensively studied as a potential neuroprotective agent. Based on its anti-inflammatory activity, we tested the efficacy of rolipram in suppressing inflammatory disease activity in multiple sclerosis in a proof-of-principle phase I/II open-label clinical trial. Enrolled MS patients were evaluated by monthly MRI and clinical examinations during 3 months (four MRIs) of pretreatment baseline and 8 months of rolipram therapy. The primary outcome was a change in contrast-enhanced lesions between baseline and the last 4 months of rolipram therapy. Previously defined biomarkers of rolipram-mediated immunomodulation were evaluated during the study. The trial was stopped prematurely because the drug was poorly tolerated and because of safety concerns: we observed an increase, rather than decrease, in the brain inflammatory activity measured by contrast-enhanced lesions on brain MRI. At the administered doses rolipram was active in vivo as documented by immunological assays. We conclude that the reasons underlying the discrepancy between the therapeutic efficacy of rolipram in experimental autoimmune encephalomyelitis versus multiple sclerosis are at present not clear.
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Affiliation(s)
- Bibiana Bielekova
- Neuroimmunology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892, USA
| | - Nancy Richert
- Neuroimmunology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892, USA
| | - Thomas Howard
- Neuroimmunology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892, USA
| | - Amy N. Packer
- Neuroimmunology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892, USA
| | - Gregg Blevins
- Neuroimmunology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892, USA
- Division of Neurology, University of Alberta, 9-101 CSB, Edmonton AB, T6G 2G3, Canada
| | - Joan Ohayon
- Neuroimmunology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892, USA
| | - Henry F. McFarland
- Neuroimmunology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892, USA
| | | | - Roland Martin
- Neuroimmunology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892, USA
- Institute of Neuroimmunology and Clinical MS Research, Center for Molecular Neurobiology Hamburg, University Medical Center Eppendorf, Falkenried 94, 20251 Hamburg, Germany
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Padmos RC, Schloot NC, Beyan H, Ruwhof C, Staal FJT, de Ridder D, Aanstoot HJ, Lam-Tse WK, de Wit H, de Herder C, Drexhage RC, Menart B, Leslie RD, Drexhage HA. Distinct monocyte gene-expression profiles in autoimmune diabetes. Diabetes 2008; 57:2768-73. [PMID: 18599519 PMCID: PMC2551688 DOI: 10.2337/db08-0496] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
OBJECTIVE There is evidence that monocytes of patients with type 1 diabetes show proinflammatory activation and disturbed migration/adhesion, but the evidence is inconsistent. Our hypothesis is that monocytes are distinctly activated/disturbed in different subforms of autoimmune diabetes. RESEARCH DESIGN AND METHODS We studied patterns of inflammatory gene expression in monocytes of patients with type 1 diabetes (juvenile onset, n = 30; adult onset, n = 30) and latent autoimmune diabetes of the adult (LADA) (n = 30) (controls subjects, n = 49; type 2 diabetic patients, n = 30) using quantitative PCR. We tested 25 selected genes: 12 genes detected in a prestudy via whole-genome analyses plus an additional 13 genes identified as part of a monocyte inflammatory signature previously reported. RESULTS We identified two distinct monocyte gene expression clusters in autoimmune diabetes. One cluster (comprising 12 proinflammatory cytokine/compound genes with a putative key gene PDE4B) was detected in 60% of LADA and 28% of adult-onset type 1 diabetic patients but in only 10% of juvenile-onset type 1 diabetic patients. A second cluster (comprising 10 chemotaxis, adhesion, motility, and metabolism genes) was detected in 43% of juvenile-onset type 1 diabetic and 33% of LADA patients but in only 9% of adult-onset type 1 diabetic patients. CONCLUSIONS Subgroups of type 1 diabetic patients show an abnormal monocyte gene expression with two profiles, supporting a concept of heterogeneity in the pathogenesis of autoimmune diabetes only partly overlapping with the presently known diagnostic categories.
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Affiliation(s)
- Roos C Padmos
- Department of Immunology, Erasmus MC, Rotterdam, the Netherlands
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Chiou YL, Shieh JJ, Lin CY. Blocking of Akt/NF-kappaB signaling by pentoxifylline inhibits platelet-derived growth factor-stimulated proliferation in Brown Norway rat airway smooth muscle cells. Pediatr Res 2006; 60:657-62. [PMID: 17065572 DOI: 10.1203/01.pdr.0000246105.56278.98] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The proliferation of airway smooth muscle cells (ASMC) can cause airway hyperresponsiveness (AHR). It has been reported that platelet-derived growth factor (PDGF) can stimulate the proliferation of ASMC through phosphatidylinositol 3-kinase (PI3 K) signaling pathway, which can activate Akt protein. Activated-Akt can activate downstream signal protein [p70S6 K, nuclear factor (NF)-kappaB, and extracellular signal regulated kinase (ERK)], increasing the cyclin D1 level and suppressing the transcription of p27Kip1 to enable cell cycle entry. This investigation demonstrated that pentoxifylline (PTX) inhibited the PDGF-stimulated proliferation of ASMC by suppressing activation of the Akt/NF-kappaB pathway. ASMC were treated with PTX for 48 h, which attenuated the PDGF-stimulated proliferation of ASMC. PTX and wortmannin, a PI3 K inhibitor, not only inhibited the PDGF-activated phosphorylation of Akt but also suppressed p70S6 K expression and IkappaBalpha degradation, inhibiting nuclear translocation and the DNA binding activity of NF-kappaB. However, PTX did not influence the phosphorylation of ERK1/2. The suppression of p70S6 K by rapamycin did not influence cyclin D1 expression in PDGF-stimulated cells. These data reveal that the down-regulation of the Akt/NF-kappaB signaling pathway by PTX inhibited the proliferation of ASMC. PTX may provide information on the pathogenesis of asthma.
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Affiliation(s)
- Ya-Ling Chiou
- Institute of Immunology and Microbiology, National Yang-Ming University, Taipei 112, Taiwan
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Sympathetic nervous system and neurotransmitters: their possible role in neuroimmunomodulation of multiple sclerosis and some other autoimmune diseases. Open Med (Wars) 2006. [DOI: 10.2478/s11536-006-0031-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractMultiple sclerosis is still a disease without a cure. Although intensive research efforts have led to the development of drugs that modify the activity of the disease, most of them have various side effects and are expensive. At the same time it is becoming apparent that some remedies usually used to treat somatic and psychic disorders also have immunomodulating properties, and may help manage multiple sclerosis and other autoimmune diseases. We describe here the role of the sympathetic nervous system in the neuro-immune interaction in multiple sclerosis and other immune diseases with increased cellular immunity as well as neurochemical disturbances that take place in these disorders.
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Wada Y, Lu R, Zhou D, Chu J, Przewloka T, Zhang S, Li L, Wu Y, Qin J, Balasubramanyam V, Barsoum J, Ono M. Selective abrogation of Th1 response by STA-5326, a potent IL-12/IL-23 inhibitor. Blood 2006; 109:1156-64. [PMID: 17053051 DOI: 10.1182/blood-2006-04-019398] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The interleukin-12 (IL-12) cytokine induces the differentiation of naive T cells to the T helper cell type 1 (Th1) phenotype and is integral to the pathogenesis of Th1-mediated immunologic disorders. A more recently discovered IL-12 family member, IL-23, shares the p40 protein subunit with IL-12 and plays a critical role in the generation of effector memory T cells and IL-17-producing T cells. We introduce a novel compound, STA-5326, that down-regulates both IL-12 p35 and IL-12/IL-23 p40 at the transcriptional level, and inhibits the production of both IL-12 and IL-23 cytokines. Oral administration of STA-5326 led to a suppression of the Th1 but not Th2 immune response in mice. In vivo studies using a CD4+CD45Rbhigh T-cell transfer severe combined immunodeficiency (SCID) mouse inflammatory bowel disease model demonstrated that oral administration of STA-5326 markedly reduced inflammatory histopathologic changes in the colon. A striking decrease in interferon-gamma (IFN-gamma) production was observed in ex vivo culture of lamina propria cells harvested from animals treated with STA-5326, indicating a down-regulation of the Th1 response by STA-5326. These results suggest that STA-5326 has potential for use in the treatment of Th1-related autoimmune or immunologic disorders. STA-5326 currently is being evaluated in phase 2 clinical trials in patients with Crohn disease and rheumatoid arthritis.
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Affiliation(s)
- Yumiko Wada
- Synta Pharmaceuticals Corp, Lexington, MA 02421, USA.
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15
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Goldfarb Y, Reinscheid RK, Kusnecov AW. Orphanin FQ/nociceptin interactions with the immune system in vivo: gene expression changes in lymphoid organs and regulation of the cytokine response to staphylococcal enterotoxin A. J Neuroimmunol 2006; 176:76-85. [PMID: 16762423 DOI: 10.1016/j.jneuroim.2006.04.008] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2006] [Revised: 04/04/2006] [Accepted: 04/10/2006] [Indexed: 11/25/2022]
Abstract
Orphanin FQ/nociceptin (OFQ/N) is a neuropeptide implicated in immunomodulation. Here, we show that endogenous and exogenous OFQ/N modulated the cytokine response to the bacterial superantigen staphylococcal enterotoxin A (SEA). Specifically, OFQ/N enhanced TNFalpha and IFNgamma transcripts in the spleen when injected prior to SEA challenge. Moreover, mice lacking the OFQ/N precursor gene showed diminished TNFalpha and IFNgamma mRNA induction in the spleen following SEA challenge. In addition, mRNA levels of ppOFQ/N and the OFQ/N receptor, NOP, were altered in thymus and spleen after SEA challenge. Overall, this suggests that the OFQ/N system can influence immune function and is itself influenced by immune stimuli.
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Affiliation(s)
- Yael Goldfarb
- Department of Psychology, Tel Aviv University, Tel Aviv, Israel
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16
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Dyke HJ, Montana JG. The therapeutic potential of PDE4 inhibitors. Expert Opin Investig Drugs 2005; 8:1301-25. [PMID: 15992151 DOI: 10.1517/13543784.8.9.1301] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Phosphodiesterase enzymes are responsible for the inactivation of cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP). Phosphodiesterase 4 (PDE4) is a cAMP specific phosphodiesterase expressed in inflammatory cells such as eosinophils. Inhibition of PDE4 results in an elevation of cAMP in these cells, which in turn downregulates the inflammatory response. The anti-inflammatory effects of PDE4 inhibitors have been well documented both in vitro and in vivo in a variety of animal models. The potential use of PDE4 inhibitors as anti-inflammatory agents for the treatment of asthma and other inflammatory disorders has received considerable attention from the pharmaceutical industry, but to date, there are no selective PDE4 inhibitors on the market. Early PDE4 inhibitors, typified by rolipram, suffered from dose-limiting side effects, including nausea and emesis, which severely restricted their therapeutic utility. Second generation compounds, including CDP840 and SB207499 (Ariflo), have been identified with reduced side effect liability. Recent evidence suggests a correlation between side effects and the ability of compounds to bind at the so-called high affinity rolipram binding site (HPDE), whilst beneficial effects appear to correlate with binding at the catalytic site. A number of companies are actively pursuing compounds which exhibit improved affinity for the catalytic site and reduced affinity for the HPDE, in the expectation that this will provide compounds with an improved therapeutic index.
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Affiliation(s)
- H J Dyke
- Celltech Chiroscience, Cambridge Science Park, Milton Road, Cambridge, CB4 4WE, UK
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17
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Yang Z, Chen M, Ellett JD, Carter JD, Brayman KL, Nadler JL. Inflammatory blockade improves human pancreatic islet function and viability. Am J Transplant 2005; 5:475-83. [PMID: 15707401 DOI: 10.1111/j.1600-6143.2005.00707.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The pathogenesis of pancreatic beta-cell death in diabetes mellitus is still under investigation. Inflammation is likely to be one of the factors responsible for beta-cell death during disease development. In this study, we have used a novel antiinflammatory compound, Lisofylline (LSF), to investigate the role of inflammatory blockade in protecting human pancreatic islets. LSF is a small synthetic molecule that reduces inflammatory cytokine production and action, improves beta-cell mitochondrial metabolism, and regulates immune activities. The present study has demonstrated that the treatment of human islets with LSF not only allows the retention of glucose responsiveness and insulin secretion in the presence of multiple proinflammatory cytokines, but also enhances basal insulin secretion of beta cells in vitro. LSF also significantly reduces islet apoptosis, protects beta cells from proinflammatory cytokine damage, and maintains cellular viability. In a mouse transplantation model, insulin independence could be reached in diabetic recipient mice by implantation of 30% fewer islets when LSF was used in islet culture compared to the control group. These results demonstrate that LSF profoundly enhances beta-cell function, and suggest the potential of using inflammatory blockade, such as LSF, to improve beta-cell function for islet transplantation.
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Affiliation(s)
- Zandong Yang
- Department of Internal Medicine, Division of Endocrinology, Metabolism, University of Virginia, Charlottesville, VA 22908, USA.
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18
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Furman B, Pyne N, Flatt P, O'Harte F. Targeting beta-cell cyclic 3'5' adenosine monophosphate for the development of novel drugs for treating type 2 diabetes mellitus. A review. J Pharm Pharmacol 2005; 56:1477-92. [PMID: 15563754 DOI: 10.1211/0022357044805] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Cyclic 3'5'AMP is an important physiological amplifier of glucose-induced insulin secretion by the pancreatic islet beta-cell, where it is formed by the activity of adenylyl cyclase, especially in response to the incretin hormones GLP-1 (glucagon-like peptide-1) and GIP (glucose-dependent insulinotropic peptide). These hormones are secreted from the small intestine during and following a meal, and are important in producing a full insulin secretory response to nutrient stimuli. Cyclic AMP influences many steps involved in glucose-induced insulin secretion and may be important in regulating pancreatic islet beta-cell differentiation, growth and survival. Cyclic AMP (cAMP) itself is rapidly degraded in the pancreatic islet beta-cell by cyclic nucleotide phosphodiesterase (PDE) enzymes. This review discusses the possibility of targeting cAMP mechanisms in the treatment of type 2 diabetes mellitus, in which insulin release in response to glucose is impaired. This could be achieved by the use of GLP-1 or GIP to elevate cAMP in the pancreatic islet beta-cell. However, these peptides are normally rapidly degraded by dipeptidyl peptidase IV (DPP IV). Thus longer-acting analogues of GLP-1 and GIP, resistant to enzymic degradation, and orally active inhibitors of DPP IV have also been developed, and these agents were found to improve metabolic control in experimentally diabetic animals and in patients with type 2 diabetes. The use of selective inhibitors of type 3 phosphodiesterase (PDE3B), which is probably the important pancreatic islet beta-cell PDE isoform, would require their targeting to the islet beta-cell, because inhibition of PDE3B in adipocytes and hepatocytes would induce insulin resistance.
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Affiliation(s)
- Brian Furman
- Department of Physiology and Pharmacology, University of Strathclyde, Strathclyde Institute for Biomedical Sciences, Taylor Street, Glasgow G4 ONR, UK.
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19
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Sanz MJ, Cortijo J, Morcillo EJ. PDE4 inhibitors as new anti-inflammatory drugs: effects on cell trafficking and cell adhesion molecules expression. Pharmacol Ther 2005; 106:269-97. [PMID: 15922015 DOI: 10.1016/j.pharmthera.2004.12.001] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/15/2004] [Indexed: 01/15/2023]
Abstract
Phosphodiesterase 4 (PDE4) is a major cyclic AMP-hydrolyzing enzyme in inflammatory and immunomodulatory cells. The wide range of inflammatory mechanisms under control by PDE4 points to this isoenzyme as an attractive target for new anti-inflammatory drugs. Selective inhibitors of PDE4 have demonstrated a broad spectrum of anti-inflammatory activities including the inhibition of cellular trafficking and microvascular leakage, cytokine and chemokine release from inflammatory cells, reactive oxygen species production, and cell adhesion molecule expression in a variety of in vitro and in vivo experimental models. The initially detected side effects, mainly nausea and emesis, appear at least partially overcome by the 'second generation' PDE4 inhibitors, some of which like roflumilast and cilomilast are in the later stages of clinical development for treatment of chronic obstructive pulmonary disease. These new drugs may also offer opportunities for treatment of other inflammatory diseases.
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Affiliation(s)
- María Jesús Sanz
- Department of Pharmacology, Faculty of Medicine, University of Valencia, Avenida Blasco Ibáñez 15, E-46010 Valencia, Spain
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20
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Valente EGA, Vernet D, Ferrini MG, Qian A, Rajfer J, Gonzalez-Cadavid NF. L-arginine and phosphodiesterase (PDE) inhibitors counteract fibrosis in the Peyronie's fibrotic plaque and related fibroblast cultures. Nitric Oxide 2004; 9:229-44. [PMID: 14996430 DOI: 10.1016/j.niox.2003.12.002] [Citation(s) in RCA: 157] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2003] [Indexed: 10/26/2022]
Abstract
Inducible nitric oxide synthase (iNOS) is expressed in both the fibrotic plaque of Peyronie's disease (PD) in the human, and in the PD-like plaque elicited by injection of TGFbeta1 into the penile tunica albuginea (TA) of the rat. Long-term inhibition of iNOS activity, presumably by blocking nitric oxide (NO)- and cGMP-mediated effects triggered by iNOS expression, exacerbates tissue fibrosis through an increase in: (a) collagen synthesis, (b) levels of reactive oxygen species (ROS), and (c) the differentiation of fibroblasts into myofibroblasts. We have now investigated whether: (a) phosphodiesterase (PDE) isoforms, that regulate the interplay of cGMP and cAMP pathways, are expressed in both the human and rat TA; and (b) L-arginine, that stimulates NOS activity and hence NO synthesis, and PDE inhibitors, that increase the levels of cGMP and/or cAMP, can inhibit collagen synthesis and induce fibroblast/myofibroblast apoptosis, thus acting as antifibrotic agents. We have found by immunohistochemistry, RT/PCR, and Western blot that PDE5A-3 and PDE4A, B, and D variants are indeed expressed in human and rat normal TA and PD plaque tissue, as well as in their respective fibroblast cultures. As expected, in the PD fibroblast cultures, pentoxifylline (non-specific cAMP-PDE inhibitor) increased cAMP levels without affecting cGMP levels, whereas sildenafil (PDE5A inhibitor) raised cGMP levels. Both agents and L-arginine reduced the expression of collagen I (but not collagen III) and the myofibroblast marker, alpha-smooth muscle actin, as determined by immunocytochemistry and quantitative image analysis. These effects were mimicked by incubation with 8-Br-cGMP, which in addition increased apoptosis, as measured by TUNEL. When L-arginine (2.25 g/kg/day), pentoxifylline (10 mg/kg/day), or sildenafil (10 mg/kg/day) was given individually in the drinking water for 45 days to rats with a PD-like plaque induced by TGF beta1, each treatment resulted in a 80-95% reduction in both plaque size and in the collagen/fibroblast ratio, as determined by Masson trichrome staining. Both sildenafil and pentoxiphylline stimulated fibroblast apoptosis within the TA. Our results support the hypothesis that the increase in NO and/or cGMP/cAMP levels by long-term administration of nitrergic agents or inhibitors of PDE, may be effective in reversing the fibrosis of PD, and more speculatively, other fibrotic conditions.
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Affiliation(s)
- Eliane G A Valente
- Division of Urology, Research and Education Institute, Harbor-UCLA Medical Center, Torrance, CA, USA
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21
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Striffler JS, Nadler JL. Lisofylline, a novel anti-inflammatory agent, enhances glucose-stimulated insulin secretion in vivo and in vitro: studies in prediabetic and normal rats. Metabolism 2004; 53:290-6. [PMID: 15015139 DOI: 10.1016/j.metabol.2003.10.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
UNLABELLED Previous studies from this laboratory have shown that the novel anti-inflammatory agent, lisofylline (LSF), improves oral glucose tolerance in streptozotocin (STZ) diabetic rats. Subsequent studies suggested that the improved glucose tolerance could be the result of enhanced beta-cell functioning. The possibility that LSF enhancement of insulin release in these animals is the result of direct effects of this agent on a residual population of functionally normal beta cells was further evaluated in these studies. In vivo studies: 6- to 8-week-old male rats were administered STZ (35 mg/kg body weight) intravenously. After 10 days, LSF administration (25 mg/kg body weight, twice daily) was initiated in the treated group (n = 11) for comparison with the vehicle-injected controls (n = 10). Body weight, food intake, and serum glucose and insulin levels were monitored weekly. Glucose and insulin responses to an oral glucose bolus were measured at 4 to 5 weeks as an index of LSF effects on impaired glucose tolerance. Glucose areas under curve (AUC) during the 2-hour tolerance tests in the LSF-treated rats (n = 11) were 23,390 +/- 253 versus 29,390 +/- 1,006 mg/dL x min (P <.0001) in the vehicle-injected rats (n = 10). Improved glucose tolerance was associated with increases in blood insulin levels in the LSF-treated rats, AUC (+LSF) = 6,564 +/- 66 versus 5,127 +/- 633 microU/mL x min in the vehicle-injected STZ-rats (not significant [NS]). These observations suggested that the improved glucose tolerance is the result of direct effects of LSF on glucose-induced release of insulin. IN VITRO STUDIES the validity of this hypothesis was subsequently tested using isolated perfused pancreas preparations from normal rats. In this series of experiments, 12-week-old animals were used, and pancreases were perfused in situ using single-pass technique. Three levels of LSF were directly infused into individual pancreas preparations and included 20 (n = 5), 40 (n = 4), and 60 (n = 4) micromol/L. First (minutes 3 to 10) and second (minutes 13 to 35) phase glucose-stimulated (300 mg/dL) insulin response areas (AUC) for the 2 phases measured in the LSF-infused pancreases were compared with AUC in vehicle-infused pancreases (n = 4). At LSF concentrations of 20 and 40 micromol/L, total insulin released during the first phase of glucose stimulation was more than twice that of the controls (3,919 +/- 739 and 3,643 +/- 630 microU, respectively v 1,481 +/- 269 microU, P <.03). A total of 60 micromol/L LSF did not significantly enhance first phase glucose-induced insulin secretion. Second phase comparisons of total insulin released in the LSF-infused versus the controls showed differences of comparable magnitude (about 2-fold) with statistical significance (P <.03) observed at all 3 levels of LSF. These findings demonstrate that LSF enhances glucose-stimulated insulin release in vitro. Enhanced beta-cell functioning by LSF likely represents an important factor underlying improved glucose tolerance in vivo. In addition, the in vitro observations in normal rat pancreas indicate that the LSF effect is not limited to beta-cell dysfunction per se. These results support the conclusion that agents, such as LSF, may have therapeutic benefits in type 2 diabetes.
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Affiliation(s)
- John S Striffler
- Division of Endocrinology, Department of Medicine, University of Virginia, Charlottesville, VA 22908, USA
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22
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Yang Z, Chen M, Ellett JD, Fialkow LB, Carter JD, Nadler JL. The novel anti-inflammatory agent lisofylline prevents autoimmune diabetic recurrence after islet transplantation1. Transplantation 2004; 77:55-60. [PMID: 14724435 DOI: 10.1097/01.tp.0000104844.48064.81] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
BACKGROUND Pancreatic islet transplantation has become a promising treatment for type 1 diabetes. However, autoimmune reactivity destroys engrafted islets in type 1 diabetic recipients. The authors' previous studies demonstrated that a novel anti-inflammatory agent, lisofylline (LSF), suppressed autoimmune reactivity and protected nonobese diabetic (NOD) mice from diabetes. In this study, the authors investigated the potential of LSF in preventing autoimmune diabetes recurrence after islet transplantation. METHODS Spontaneously diabetic NOD mice received NOD severe combined immunodeficiency islet transplants and were treated with daily LSF injections at 50 mg/kg for 3 weeks. Blood glucose levels were monitored. Serum cytokine levels were measured at 1 and 3 weeks after engraftment. Nephrectomy of the islet-implanted kidney was performed in LSF-treated recipients. Histology of islet grafts was assessed at the end of the study. The effect of LSF on beta-cell function was studied in vitro. RESULTS Without immunosuppressants and insulin, the LSF-treated recipient mice maintained euglycemia significantly longer than the saline-treated recipients (mean, >65 days in the LSF-treated group vs. 6 days in saline controls; P=0.0004). Serum levels of interferon-gamma were markedly reduced in LSF-treated recipients at 1 and 3 weeks posttransplant. Diabetes recurred in the LSF-treated recipients after removing the islet-implanted kidneys. Immunohistochemistry showed retention of insulin-positive cells in the grafts of the LSF-treated recipients. LSF preserved beta-cell insulin secretory function in the presence of inflammatory cytokines in vitro. CONCLUSIONS This study demonstrates that autoimmune diabetes recurrence after islet transplantation could be prevented by treatment with LSF. LSF and its analogues may have the potential to prevent islet autoimmune destruction in clinical transplantation.
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Affiliation(s)
- Zandong Yang
- Division of Endocrinology and Metabolism, Department of Internal Medicine, University of Virginia, Charlottesville, VA 22908, USA.
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23
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Pyne NJ, Furman BL. Cyclic nucleotide phosphodiesterases in pancreatic islets. Diabetologia 2003; 46:1179-89. [PMID: 12904862 DOI: 10.1007/s00125-003-1176-7] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2003] [Revised: 05/08/2003] [Indexed: 11/30/2022]
Abstract
Cyclic nucleotide phosphodiesterases (PDEs) comprise a family of enzymes (PDE1-PDE11) which hydrolyse cyclic AMP and cyclic GMP to their biologically inactive 5' derivatives. Cyclic AMP is an important physiological amplifier of glucose-induced insulin secretion. As PDEs are the only known mechanism for inactivating cyclic nucleotides, it is important to characterise the PDEs present in the pancreatic islet beta cells. Several studies have shown pancreatic islets or beta cells to contain PDE1C, PDE3B and PDE4, with some evidence for PDE10A. Most evidence suggests that PDE3B is the most important in relation to the regulation of insulin release, although PDE1C could have a role. PDE3-selective inhibitors augment glucose-induced insulin secretion. In contrast, activation of beta-cell PDE3B could mediate the inhibitory effect of IGF-1 and leptin on insulin secretion. In vivo, although PDE3 inhibitors augment glucose-induced insulin secretion, concomitant inhibition of PDE3B in liver and adipose tissue induce insulin resistance and PDE3 inhibitors do not induce hypoglycaemia. The development of PDE3 inhibitors as anti-diabetic agents would require differentiation between PDE3B in the beta cell and that in hepatocytes and adipocytes. Through their effects in regulating beta-cell cyclic nucleotide concentrations, PDEs could modulate beta-cell growth, differentiation and survival; some work has shown that selective inhibition of PDE4 prevents diabetes in NOD mice and that selective PDE3 inhibition blocks cytokine-induced nitric oxide production in islet cells. Further work is required to understand the mechanism of regulation and role of the various PDEs in islet-cell function and to validate them as targets for drugs to treat and prevent diabetes.
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Affiliation(s)
- N J Pyne
- Department of Physiology and Pharmacology, Strathclyde Institute for Biomedical Sciences, University of Strathclyde, Glasgow, Scotland
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24
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Heystek HC, Thierry AC, Soulard P, Moulon C. Phosphodiesterase 4 inhibitors reduce human dendritic cell inflammatory cytokine production and Th1-polarizing capacity. Int Immunol 2003; 15:827-35. [PMID: 12807821 DOI: 10.1093/intimm/dxg079] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Inhibitors of cAMP-specific phosphodiesterase (PDE) 4 have been shown to inhibit inflammatory mediator release and T cell proliferation, and are considered candidate therapies for T(h)1-mediated diseases. However, little is known about how PDE4 inhibitors influence dendritic cells (DC), the cells responsible for the priming of naive T(h) cells. Therefore, we investigated the PDE profile of monocyte-derived DC, and whether PDE4 inhibitors modulate DC cytokine production and T cell-polarizing capacity. We mainly found cAMP-specific PDE4 enzymatic activity in both immature and mature DC. In contrast to monocytes that mainly express PDE4B, we found that PDE4A is the predominant PDE4 subtype present in DC. Immature DC showed reduced ability to produce IL-12p70 and tumor necrosis factor (TNF)-alpha upon lipopolysaccharide or CD40 ligand (CD40L) stimulation in the presence of PDE4 inhibitors, whereas cytokine production upon CD40L stimulation of fully mature DC in the presence of PDE4 inhibitors was not affected. Exposure to PDE4 inhibitors for 2 days during DC maturation did not influence T cell-stimulatory capacity or acquisition of a mature phenotype, but increased the expression of the chemokine receptor CXCR4. Furthermore, DC matured in the presence of PDE4 inhibitors showed reduced capacity to produce IL-12p70 and TNF-alpha upon subsequent CD40L stimulation. Using these PDE4 inhibitor-matured DC to stimulate naive T cells resulted in a reduction of IFN-gamma-producing (T(h)1) cells. These findings indicate that PDE4 inhibitors can affect T cell responses by acting at the DC level and may increase our understanding of the therapeutic implication of PDE4 inhibitors for T(h)1-mediated disorders.
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Affiliation(s)
- Heleen C Heystek
- Pfizer Global Research and Development, Fresnes Laboratories, 94265 Fresnes, France
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25
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Lugnier C. Cyclic nucleotide phosphodiesterase families in intracellular signaling and diabetes. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2002; 498:253-61. [PMID: 11900376 DOI: 10.1007/978-1-4615-1321-6_32] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- C Lugnier
- Pharmacologie et Physico-Chimie des Interactions Moléculaires et Cellulaires, CNRS UMR 7034, Université Louis Pasteur de Strasbourg, Faculté de Pharmacie, Illkirch, France
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26
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Visser J, Groen H, Klatter F, Rozing J. Timing of pentoxifylline treatment determines its protective effect on diabetes development in the Bio Breeding rat. Eur J Pharmacol 2002; 445:133-40. [PMID: 12065204 DOI: 10.1016/s0014-2999(02)01625-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Diabetes-prone Bio Breeding (DP-BB) rats spontaneously develop diabetes between 60 and 120 days of age. Diabetes-resistant (DR)-BB rats can be induced to develop diabetes by poly(I:C) and anti-RT6. Here, we studied the effect of pentoxifylline, a potent anti-inflammatory agent, on diabetes development in both BB rat models of insulin-dependent diabetes mellitus and investigated whether these effects were related to differential modulation of tumour necrosis factor (TNF)-alpha and interleukin-10. When DP-BB rats received pentoxifylline from day 60 onwards, diabetes development was delayed and reduced. The other treatment protocols had no effect. In DR-BB rats, pentoxifylline treatment resulted only in a delay of diabetes development. In both BB rat models, in vivo pentoxifylline treatment potently suppressed TNF-alpha, but only moderately affected interleukin-10 production in vitro. These results show that timing of pentoxifylline treatment determines its protective effect on diabetes development in DP-BB rats. The observed pentoxifylline-induced increase of the interleukin-10/TNF-alpha ratio might be a mechanism for protection or delay of the diabetes development.
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Affiliation(s)
- Jeroen Visser
- Department of Cell Biology, Immunology Section, Faculty Medical Sciences, Groningen University, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands
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27
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Lazarczyk M, Grzela T, Korczak-Kowalska G, Józwiak J. Pentoxifylline inhibits perforin-dependent PBMC cytotoxic activity. Transplant Proc 2002; 34:1079-82. [PMID: 12072282 DOI: 10.1016/s0041-1345(02)02792-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- M Lazarczyk
- Department of Histology and Embryology, Center of Biostructure Research, Warsaw, Poland
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28
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Kaya TT, Koyluoglu G, Soydan AS, Arpacik M, Karadas B. Effects of nimesulide and pentoxifylline on decreased contractile responses in rat ileum with peritonitis. Eur J Pharmacol 2002; 442:147-53. [PMID: 12020692 DOI: 10.1016/s0014-2999(02)01509-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The aim of this study was to determine the effects of nimesulide and pentoxifylline on the contractile effects of KCl, carbachol and substance P in the longitudinal muscle of rat ileum during peritonitis. Peritonitis was induced in rat ileum by cecal ligation and puncture. Thirty rats were operated on to induce peritonitis, 10 of which received nimesulide (5 mg/kg, subcutaneously) and 10 of which received pentoxifylline (25 mg/kg, subcutaneously) before the operation; 10 other rats underwent a sham operation and acted as controls. Twenty-four hours after the operation, ileum segments were transferred to isolated organ baths and responses to KCl, carbachol and substance P were recorded. Emax values of KCl, carbachol and substance P were markedly lower (P<0.05), with no change in the pD2 values, in the peritonitis group than in the controls. Peritonitis-induced changes in the KCl, carbachol and substance P responses of ileum were significantly restored by nimesulide (P<0.05), but not by pentoxifylline. The improved contractile responses following nimesulide treatment indicate that products of cyclooxygenase-II may be, at least in part, responsible for the decreased contractile responses to KCl, carbachol and substance P in peritonitis.
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Affiliation(s)
- Tijen Temiz Kaya
- Department of Pharmacology, Faculty of Medicine, Cumhuriyet University, Sivas, Turkey
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29
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Mensah-Brown EPK, Stosic Grujicic S, Maksimovic D, Jasima A, Shahin A, Lukic ML. Downregulation of apoptosis in the target tissue prevents low-dose streptozotocin-induced autoimmune diabetes. Mol Immunol 2002; 38:941-6. [PMID: 12009572 DOI: 10.1016/s0161-5890(02)00021-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
3,7-dimethyl-1-(5-oxohexyl) xanthine, pentoxifylline (PTX) is shown to affect cytokine-induced apoptosis in several experimental models and clinical conditions. It had been also shown to prevent insulitis and hyperglycemia in non-obese diabetic (NOD) mice, and mice and rats susceptible to diabetes induction with multiple low-doses of streptozotocin (MLD-STZ). We therefore analysed the development of diabetes and apoptosis of pancreatic beta islet cells in CBA/mice after diabetes induction with MLD-STZ. We have evaluated the effect of PTX on the level of apoptosis in the islet at different time intervals after diabetes induction. Complementary histological and immunohistochemical studies and analyses of the expression of cytokines and nitric oxide have also been done. It was concluded that PTX significantly attenuated apoptosis of the beta-cells in the islet and suppressed the induction of diabetes. Our data are compatible with the notion that interferon-gamma (IFN-gamma)/tumor necrosis factor (TNF)/nitric oxide (NO)-induced apoptosis of beta-cells in experimental diabetes is attenuated by PTX.
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Affiliation(s)
- E P K Mensah-Brown
- Department of Medical Microbiology, Faculty of Medicine and Health Sciences, United Arab Emirates University, P.O. Box 17666, Al Ain, United Arab Emirates
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30
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Prud'homme GJ, Chang Y, Li X. Immunoinhibitory DNA vaccine protects against autoimmune diabetes through cDNA encoding a selective CTLA-4 (CD152) ligand. Hum Gene Ther 2002; 13:395-406. [PMID: 11860706 DOI: 10.1089/10430340252792521] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Cytotoxic T lymphocyte antigen 4 (CTLA-4 or CD152) is a strong negative regulator of T cell activity. Like CD28 (a positive regulator) it binds to B7-1 and B7-2, and there is no known natural selective ligand. Monoclonal antibodies to CTLA-4 generally have a masking effect, enhancing rather than suppressing responses. However, a single amino acid substitution in B7-1 (W88 > A; denoted B7-1wa) abrogates binding to CD28 but not to CTLA-4. We constructed plasmids encoding B7-1 or B7-1wa, as cell-surface or Ig fusion proteins. In a bound state, B7-1-Ig enhanced CD3-mediated T cell activation, but B7-1wa-Ig was inhibitory, as expected of a CTLA-4 ligand. To alter immunity in vivo, we inoculated mice intramuscularly (i.m.) with a carcinoembryonic antigen (CEA) plasmid. Gene transfer was amplified by electroporation. Co-injection of a B7-1wa (membrane-bound form) plasmid blocked induction of anti-CEA immunity, whereas a B7-1 plasmid was stimulatory. We studied this DNA covaccination method in nonobese diabetic (NOD) mice with autoimmune diabetes. Delivery of either preproinsulin I (PPIns) or B7-1wa cDNA alone did not suppress the autoimmune anti-insulin response of spleen cells. However, co-delivery of B7-1wa and PPIns cDNA abrogated reactivity to insulin and ameliorated disease. Interferon-gamma and interleukin-4 were both depressed, arguing against a Th2 bias. Reactivity to glutamic acid decarboxylase 65, another major islet autoantigen, was not altered and suppressor cells were not identified, suggesting induction of tolerance to insulin by either T cell anergy or deletion. Selective engagement of CTLA-4 through gene transfer represents a novel and powerful way to block autoimmunity specifically.
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MESH Headings
- Abatacept
- Animals
- Antigens, CD
- Antigens, Differentiation/genetics
- Antigens, Differentiation/immunology
- B7-1 Antigen/administration & dosage
- B7-1 Antigen/genetics
- CTLA-4 Antigen
- Cells, Cultured
- DNA, Complementary/administration & dosage
- DNA, Complementary/immunology
- Diabetes Mellitus, Type 1/immunology
- Diabetes Mellitus, Type 1/prevention & control
- Female
- Immunoconjugates
- Immunosuppression Therapy/methods
- Insulin/metabolism
- Ligands
- Lymphocyte Activation/genetics
- Lymphocyte Activation/immunology
- Mice
- Mice, Inbred C57BL
- Mice, Inbred NOD
- Spleen
- T-Lymphocytes/immunology
- Vaccines, DNA/administration & dosage
- Vaccines, DNA/immunology
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Affiliation(s)
- Gerald J Prud'homme
- The Department of Pathology, McGill University, Montreal, Qc, Canada H3A2B4.
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31
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Bach JF. Immunotherapy of type 1 diabetes: lessons for other autoimmune diseases. ARTHRITIS RESEARCH 2002; 4 Suppl 3:S3-15. [PMID: 12110118 PMCID: PMC3240130 DOI: 10.1186/ar554] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/23/2002] [Revised: 02/27/2002] [Accepted: 03/03/2002] [Indexed: 02/07/2023]
Abstract
The nonobese diabetic (NOD) mouse is a well-recognised animal model of spontaneous autoimmune insulin-dependent diabetes mellitus. The disease is T-cell mediated, involving both CD4 and CD8 cells. Its progress is controlled by a variety of regulatory T cells. An unprecedented number of immunological treatments have been assessed in this mouse strain. This chapter systematically reviews most of these therapeutic manoeuvres, discussing them in the context of their significance with regard to the underlying mechanisms and the potential clinical applications. The contrast between the surprisingly high rate of success found for a multitude of treatments (more than 160) administered early in the natural history of the disease and the few treatments active at a late stage is discussed in depth. Most of the concepts and strategies derived from this model apply to other autoimmune diseases, for which no such diversified data are available.
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32
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Reimund JM, Raboisson P, Pinna G, Lugnier C, Bourguignon JJ, Muller CD. Anti-TNF-alpha properties of new 9-benzyladenine derivatives with selective phosphodiesterase-4- inhibiting properties. Biochem Biophys Res Commun 2001; 288:427-34. [PMID: 11606060 DOI: 10.1006/bbrc.2001.5786] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In inflammatory cells, intracellular cAMP concentration is regulated by cyclic nucleotide phosphodiesterases 4. Therefore, PDE4 inhibition appears as a rational goal for treating acute or chronic inflammatory diseases. Selective PDE4 inhibitors have been developed, but due to unwanted side effects, search for new selective PDE4-inhibitors had to be pursued. Recently, Boichot et al. (J. Pharmacol. Exp. Ther. (2000) 292, 647-653) showed that 9-benzyladenine derivatives are selective PDE4 inhibitors. In vivo data in animals suggested that they may induce fewer side effects (emesis). We examined the effects of new 9-benzyladenines on TNF-alpha, interleukin (IL)-1beta, IL-6 and IL-8 production by lipopolysaccharide-activated peripheral blood mononuclear cells, and compared them to other PDEs inhibitors. Selected potent 9-benzyladenines, strongly inhibited TNF-alpha production. Interleukin-1beta, IL-6, and IL-8 production was not significantly affected. Our results suggest that some of these new adenines (i.e., NCS 675 and NCS 700), may be potential therapeutic candidates for the treatment of inflammatory diseases.
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Affiliation(s)
- J M Reimund
- Laboratoire de Pharmacologie et Physico-Chimie des Interactions Cellulaires et Moléculaires (UMR 7034 du CNRS), Université Louis Pasteur de Strasbourg, UFR de Sciences Pharmaceutiques, 74 route du Rhin, 67401 Illkirch Cedex, France
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33
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Fleming CM, He H, Ciota A, Perkins D, Finn PW. Administration of pentoxifylline during allergen sensitization dissociates pulmonary allergic inflammation from airway hyperresponsiveness. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2001; 167:1703-11. [PMID: 11466394 DOI: 10.4049/jimmunol.167.3.1703] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Asthma, a chronic inflammatory disease characterized by intermittent, reversible airflow obstruction and airway hyperresponsiveness (AHR), is classically characterized by an excess of Th2 cytokines (IL-13, IL-4) and depletion of Th1 cytokines (IFN-gamma, IL-12). Recent studies indicating an important role for Th1 immunity in the development of AHR with allergic inflammation suggest that Th1/Th2 balance may be important in determining the association of AHR with allergic inflammation. We hypothesized that administration of pentoxifylline (PTX), a phosphodiesterase inhibitor known to inhibit Th1 cytokine production, during allergen (OVA) sensitization and challenge would lead to attenuation of AHR in a murine model of allergic pulmonary inflammation. We found that PTX treatment led to attenuation of AHR when administered at the time of allergen sensitization without affecting other hallmarks of pulmonary allergic inflammation. Attenuation of AHR with PTX treatment was found in the presence of elevated bronchoalveolar lavage fluid levels of the Th2 cytokine IL-13 and decreased levels of the Th1 cytokine IFN-gamma. PTX treatment during allergen sensitization leads to a divergence of AHR and pulmonary inflammation following allergen challenge.
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Affiliation(s)
- C M Fleming
- Pulmonary and Critical Care Unit, Department of Medicine, Massachusetts General Hospital, Boston, MA 02114, USA
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34
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Beshay E, Prud'homme GJ. Inhibitors of phosphodiesterase isoforms III or IV suppress islet-cell nitric oxide production. J Transl Med 2001; 81:1109-17. [PMID: 11502862 DOI: 10.1038/labinvest.3780323] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
The general phosphodiesterase (PDE) inhibitor pentoxifylline (PTX), and the PDE type IV inhibitor rolipram (ROL), both increase intracellular cAMP levels and suppress inflammatory cytokine production by T cells and macrophages. We have previously shown that PTX and ROL protect from autoimmune diabetes in nonobese diabetic (NOD) mice. These drugs may mediate some of their anti-inflammatory effects by blocking nitric oxide (NO) production by macrophages. In this study, we investigated the effect of PDE inhibitors in blocking NO production by insulin-secreting NIT-1 insulinoma cells and mouse islet cells in vitro and in vivo. Insulinoma cells and islet cells produced NO when stimulated with a combination of inflammatory cytokines and lipopolysaccharide (LPS). We found that both PTX and ROL markedly suppressed this induced NO production. Islet cells express PDEs III and IV and, accordingly, the PDE III inhibitor cilostamide (CIL) also suppressed NO production, and a combination of ROL and CIL had a synergistic effect. This suppression appeared to be mediated, at least in part, by elevating cAMP level and was mimicked by other cAMP-elevating agents, ie, membrane-permeable cAMP analogs (dibutyryl cAMP and 8-bromo cAMP) and an adenylate cyclase stimulator (forskolin). PDE inhibitors suppressed the expression of inducible nitric oxide synthase (iNOS) mRNA. In vivo treatment with PTX or ROL prevented iNOS protein expression in the islets of NOD mice with cyclophosphamide-accelerated disease. Our findings suggest that PDE inhibitors can protect islets against autoimmunity.
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Affiliation(s)
- E Beshay
- Department of Pathology, McGill University, Montreal, Quebec, Canada
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35
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Laurat E, Poirier B, Tupin E, Caligiuri G, Hansson GK, Bariéty J, Nicoletti A. In vivo downregulation of T helper cell 1 immune responses reduces atherogenesis in apolipoprotein E-knockout mice. Circulation 2001; 104:197-202. [PMID: 11447086 DOI: 10.1161/01.cir.104.2.197] [Citation(s) in RCA: 185] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND A chronic immune response involving proinflammatory T helper cell 1 (Th1) lymphocyte activation occurs in the atherosclerotic lesion, but whether this activation is protective or deleterious remains unclear. Methods and Results-- We modulated the immune response of the atherosclerosis-prone apolipoprotein E-deficient (apoE(-/-)) mouse. Eight-week-old apoE(-/-) mice were treated daily with pentoxifylline (PTX), a known inhibitor of the Th1 differentiation pathway, or PBS (control) for 4 weeks or 12 weeks. Twelve-week PTX treatment reduced atherosclerotic lesion size by 60% (P<0.01). PTX-treated mice developed lesions that were limited to the degree of fatty streaks. In contrast, control mice developed mature fibrofatty atherosclerotic lesions. In parallel, the proportion of interferon (IFN)-gamma-producing Th1 splenic lymphocytes was significantly reduced by PTX, and lesion size was correlated to the proportion of IFN-gamma(+) T cells. In vitro addition of PTX to cultured spleen cells did not modify the production of IFN-gamma but increased the production of IL-10 by T cells, indicating that PTX does not suppress IFN-gamma production but rather blocks Th1 polarization while promoting Th2 polarization. CONCLUSIONS Thus, PTX protected mice from atherosclerosis by reducing the Th1 polarization of T helper lymphocytes. This study demonstrates that the Th1 immune response associated with atherosclerosis is deleterious and that a modulation of the Th1 differentiation pathway may provide a new pharmacological tool to treat this disease.
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Affiliation(s)
- E Laurat
- INSERM U430, Hôpital Broussais, Paris, France
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36
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Samardzic T, Jankovic V, Stosic-Grujicic S, Popadic D, Trajkovic V. Pentoxifylline inhibits the synthesis and IFN-gamma-inducing activity of IL-18. Clin Exp Immunol 2001; 124:274-81. [PMID: 11422205 PMCID: PMC1906051 DOI: 10.1046/j.1365-2249.2001.01546.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The effect of phosphodiesterase-inhibiting anti-inflammatory drug pentoxifylline (PTX) on LPS-induced IL-18 synthesis and IL-18-mediated IFN-gamma-induction were investigated. In a dose-dependent manner PTX inhibited production of IL-18 in LPS-treated cultures of murine spleen cells and bone marrow-derived macrophages. Similarly, PTX treatment significantly reduced blood IL-18 levels and expression of spleen IL-18 mRNA in LPS-challenged mice. The inhibitory effect of PTX was specific for IL-18, since LPS-induced IL-12 p40 release was not suppressed either in splenocyte cultures or blood of LPS-injected animals. Synergistic induction of IFN-gamma by combined IL-12/IL-18 treatment was also inhibited by PTX in vitro and in vivo. Experiments with IL-12 pretreatment of splenocytes, followed by IL-18 stimulation, revealed that PTX suppressed both IL-12 and IL-18 signals responsible for IFN-gamma induction. These results suggest that interference with IL-18 synthesis and IFN-gamma-inducing activity might contribute to anti-inflammatory actions of PTX.
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Affiliation(s)
- T Samardzic
- Institute for Biological Research Sinisa Stankovic, Belgrade, Yugoslavia
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37
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Beshay E, Croze F, Prud'homme GJ. The phosphodiesterase inhibitors pentoxifylline and rolipram suppress macrophage activation and nitric oxide production in vitro and in vivo. Clin Immunol 2001; 98:272-9. [PMID: 11161985 DOI: 10.1006/clim.2000.4964] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We studied the effects of the phosphodiesterase inhibitors pentoxifylline (PTX) and rolipram (ROL) on nitric oxide (NO) production by macrophages and correlated this with cellular cAMP levels. The RAW 264.7 cell line or mouse peritoneal macrophages were activated with lipopolysaccharide (LPS) and interferon gamma (IFN gamma), with or without ROL, PTX, cAMP analogues, or Forskolin. In vivo, peritoneal macrophages were stimulated with staphylococcal enterotoxin B with or without administration of ROL. Nitrite levels in culture and the total cellular cAMP levels were measured. ROL and PTX suppressed NO production of LPS/IFN gamma-stimulated macrophages. ROL (IC(50) = 68-74 microM) was about 40 times more potent than PTX (IC(50) = 2.4-2.9 mM). The suppression paralleled increased total cellular cAMP level (EC(50) = 68-72 microM) and was mimicked by other cAMP elevating agents. ROL and PTX suppressed inducible NO synthase at the mRNA level. The inhibition of NO production of macrophages by ROL or PTX could be beneficial in NO-mediated inflammatory and/or autoimmune disorders.
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MESH Headings
- 8-Bromo Cyclic Adenosine Monophosphate/pharmacology
- Animals
- Autoimmune Diseases/drug therapy
- Autoimmune Diseases/genetics
- Autoimmune Diseases/immunology
- Bucladesine/pharmacology
- Cells, Cultured/drug effects
- Cells, Cultured/metabolism
- Colforsin/pharmacology
- Cyclic AMP/metabolism
- Diabetes Mellitus, Type 1/drug therapy
- Diabetes Mellitus, Type 1/genetics
- Diabetes Mellitus, Type 1/immunology
- Dibutyryl Cyclic GMP/pharmacology
- Disease Models, Animal
- Drug Evaluation, Preclinical
- Enterotoxins/pharmacology
- Enzyme Induction/drug effects
- Female
- Interferon-gamma/pharmacology
- Interleukin-12/pharmacology
- Lipopolysaccharides/pharmacology
- Macrophage Activation/drug effects
- Macrophages, Peritoneal/drug effects
- Macrophages, Peritoneal/metabolism
- Mice
- Mice, Inbred NOD
- Nitric Oxide/biosynthesis
- Nitric Oxide Synthase/biosynthesis
- Nitric Oxide Synthase/genetics
- Nitrites/analysis
- Pentoxifylline/pharmacology
- Phosphodiesterase Inhibitors/pharmacology
- RNA, Messenger/biosynthesis
- Recombinant Proteins/pharmacology
- Reverse Transcriptase Polymerase Chain Reaction
- Rolipram/pharmacology
- Tumor Necrosis Factor-alpha/pharmacology
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Affiliation(s)
- E Beshay
- The Department of Pathology, McGill University, 3775 University Street, Montreal, Quebec, H3A 2B4, Canada
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38
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Stosić-Grujicić S, Maksimović D, Badovinac V, Samardzić T, Trajković V, Lukić M, Mostarica Stojković M. Antidiabetogenic effect of pentoxifylline is associated with systemic and target tissue modulation of cytokines and nitric oxide production. J Autoimmun 2001; 16:47-58. [PMID: 11221996 DOI: 10.1006/jaut.2000.0456] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We have shown recently that xanthine derivative pentoxifylline (PTX) downregulates an inflammatory autoimmune process triggered in genetically susceptible Dark Agouti rats by multiple low doses of streptozotocin (MLD-SZ, 20 mg/kg/day ip for 5 days). We studied the cellular and molecular consequences of PTX treatment during MLD-SZ-induced diabetes with special emphasis on local vs. systemic production of inflammatory mediators. Administration of PTX (200 mg/kg/day for 10 days) during induction of the disease reduced clinical signs of diabetes and protected rats from development of destructive intrainsulitis. Pentoxifylline did not affect diabetogenic effect of single high dose of SZ (100 mg/kg SZ). Ex vivo analysis of the islets of Langerhans performed in early disease development revealed that PTX downregulates production of proinflammatory cytokines IFN-gamma and TNF, as well as inducible nitric oxide synthase (iNOS) expression and NO production. In addition, PTX treatment suppressed splenocyte autoreactivity, as well as the frequency of cells expressing IL-2R and MHC class II antigens. There was no evidence of any changes in proportion of ICAM-1 and LFA-1 expressing splenocytes in comparison to control MLD-SZ-treated animals. In contrast to suppressed intraislet production, high peripheral expression of both iNOS mRNA and NO was found in MLD-SZ rats treated with PTX. Taken together, the data indicate that the effect on both systemic and intra-islet production of NO, suppression of autoreactive cell activation and of local type 1 cytokine release may contribute to the therapeutic benefit achieved by PTX in the rat.
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Affiliation(s)
- S Stosić-Grujicić
- Institute for Biological Research 'Sinisa Stankovic', Belgrade, Yugoslavia.
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39
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Affiliation(s)
- M Conti
- Department of Gynecology and Obstetrics, Stanford University School of Medicine, California 94305-5317, USA
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40
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Dal Piaz V, Giovannoni MP. Phosphodiesterase 4 inhibitors, structurally unrelated to rolipram, as promising agents for the treatment of asthma and other pathologies. Eur J Med Chem 2000; 35:463-80. [PMID: 10889326 DOI: 10.1016/s0223-5234(00)00179-3] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
An increase of cyclic adenosine and guanosine monophosphate (cAMP and cGMP) level can be achieved by inhibition of phosphodiesterases (PDEs), which are the enzymes responsible for the conversion of these second messengers into the corresponding 5-monophosphate inactive counterparts. The high heterogeneity in PDE families and in their tissue distribution, as well as their different functional role, make these enzymes very attractive targets for medicinal chemists. The PDE 4 family is particularly abundant in immunocompetent cells, where an increase of cAMP leads to the inhibition of the synthesis and release of pro-inflammatory mediators, cytokines and active oxygen species. Moreover PDE 4 inhibitors are able to reduce bronchial smooth muscle tone in vitro and show bronchodilatory effects in vivo. Thus, the current therapy for asthma, which is based on a combination of beta(2) agonists and corticosteroids, could be replaced by treatment with PDE 4 inhibitors. This review mainly covers PDE 4 inhibitors structurally related to xanthines and Nitraquazone, which appear to be very attractive models for the synthesis of novel PDE 4 inhibitors potentially useful for the treatment of asthma, chronic pulmonary obstructive disease and some autoimmune diseases. These compounds could be devoid of the central side-effects (nausea, vomiting, headache) of the archetypal Rolipram, which hampered its development as a drug. The review also highlights the novel structural classes of PDE 4 inhibitors recently reported in the literature.
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Affiliation(s)
- V Dal Piaz
- Dipartimento di Scienze Farmaceutiche, Università di Firenze, Via G. Capponi 950121, Florence, Italy.
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41
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Souness JE, Aldous D, Sargent C. Immunosuppressive and anti-inflammatory effects of cyclic AMP phosphodiesterase (PDE) type 4 inhibitors. IMMUNOPHARMACOLOGY 2000; 47:127-62. [PMID: 10878287 DOI: 10.1016/s0162-3109(00)00185-5] [Citation(s) in RCA: 199] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- J E Souness
- Discovery Biology 1 (JA3-1), Aventis Pharma Ltd., Dagenham Research Centre, Rainham Road South, Dagenham, RM10 7XS, Essex, UK.
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42
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Barnette MS, Underwood DC. New phosphodiesterase inhibitors as therapeutics for the treatment of chronic lung disease. Curr Opin Pulm Med 2000; 6:164-9. [PMID: 10741778 DOI: 10.1097/00063198-200003000-00014] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Phosphodiesterase 4 (PDE4) is a member of the growing family cyclic AMP and cyclic GMP. Earliest described inhibitors of PDE4, such as rolipram, demonstrate marked anti-inflammatory and bronchodilatory effects in vitro and in vivo. The clinical utility of these earlier compounds was limited by their propensity to elicit gastrointestinal side effects. This has led to an extensive effort to identify novel PDE4 inhibitors that maintain the anti-inflammatory activity and bronchodilatory activity of rolipram but with a reduced potential to produce side effects. This article summarizes the evidence supporting the utility of selective PDE4 inhibitors in the treatment of asthma and chronic obstructive pulmonary disease, discusses the recent results obtained in clinical trials with second-generation inhibitors, and presents two approaches designed to identify additional novel selective PDE4 inhibitors.
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Affiliation(s)
- M S Barnette
- Department of Pulmonary Pharmacology, SmithKline Beecham Pharmaceuticals, King of Prussia, PA 19406-0939, USA
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43
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Solerte SB, Ceresini G, Ferrari E, Fioravanti M. Hemorheological changes and overproduction of cytokines from immune cells in mild to moderate dementia of the Alzheimer's type: adverse effects on cerebromicrovascular system. Neurobiol Aging 2000; 21:271-81. [PMID: 10867211 DOI: 10.1016/s0197-4580(00)00105-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An association between hemorheological alterations (i.e., whole-blood and plasma hyperviscosity, reduced erythrocyte deformability, increased red cell aggregation, hyperfibrinogenemia and increased acute-phase protein levels) and the mild stage of senile dementia of the Alzheimer's type (DAT) was suggested in the present study. In particular, hyperfibrinogenemia and the increase of erytrhocyte aggregation were correlated with the increased generation and release of TNF-alpha and IFN-gamma (spontaneous release and IL-2-modulated release) from natural killer (NK) lymphocytes (CD16+, CD56+, CD3- cells) of patients with DAT; whereas a normal cytokine release from NK cells was found in healthy old subjects and in patients with vascular dementia (VaD). The in vitro and in vivo administration of the hemorheologic drug pentoxifylline (PTX) significantly reduced spontaneous and IL-2-modulated cytokine overproduction from NK cells (in vitro effects with 500 U/ml and 1000 U/ml/NK cells) and improved all the hemorheological parameters. Taken together, these data suggest that disturbances of cerebrovascular flow and of hemorheology could be considered a negative component related to the pathogenesis and progression of DAT neurodegeneration. The association between hemorheological changes and alterations of TNF-alpha and IFN-gamma release from NK may indicate a potential immunorheologic mechanism associated with cerebrovascular damage in DAT and could suggest the use of vascular protective drugs as support of the main pharmacological and non-pharmacological therapy of AD.
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Affiliation(s)
- S B Solerte
- Department of Internal Medicine, Geriatrics and Gerontology Clinic, School of Geriatrics, University of Pavia, Ospedale S.Margherita, Piazza Borromeo 2, 27100, Pavia, Italy.
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44
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Barnette MS. Phosphodiesterase 4 (PDE4) inhibitors in asthma and chronic obstructive pulmonary disease (COPD). PROGRESS IN DRUG RESEARCH. FORTSCHRITTE DER ARZNEIMITTELFORSCHUNG. PROGRES DES RECHERCHES PHARMACEUTIQUES 2000; 53:193-229. [PMID: 10616299 DOI: 10.1007/978-3-0348-8735-9_5] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Phosphodiesterases (PDE) are a family of enzymes responsible for the metabolism of the intracellular second messengers cyclic AMP and cyclic GMP. PDE4 is a cyclic AMP specific PDE that is the major if not sole cyclic AMP metabolizing enzymes found in inflammatory and immune cells, and contributes significantly to cyclic AMP metabolism in smooth muscles. Based on its cellular and tissue distribution and the demonstration that selective inhibitors of this isozyme reduce bronchoconstriction in animals and suppress the activation of inflammatory cells, PDE4 has become an important molecular target for the development of novel therapies for asthma and COPD. This chapter will review the evidence demonstrating the ability of PDE4 inhibitors to modify airway obstruction, airway inflammation and airway remodelling and hyperreactivity, will present some preliminary findings obtained with theses compounds in clinical trials and and will discuss experimental approaches designed to identify novel compounds that maintain the beneficial activity of the initial selective PDE4 inhibitors but with a reduced tendency of elicit the gastrointestinal side effects observed with this class of compounds.
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Affiliation(s)
- M S Barnette
- SmithKline Beecham Pharmaceuticals, King of Prussia, PA 19406-0939, USA
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45
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Coon ME, Diegel M, Leshinsky N, Klaus SJ. Selective Pharmacologic Inhibition of Murine and Human IL-12-Dependent Th1 Differentiation and IL-12 Signaling. THE JOURNAL OF IMMUNOLOGY 1999. [DOI: 10.4049/jimmunol.163.12.6567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
We have previously shown that lisofylline (LSF) inhibits murine Th1-mediated disease in vivo by blocking IL-12-induced differentiation of Th1 cells. The cellular and molecular mechanisms underlying this inhibition were further explored by testing LSF in several IL-12-responsive model systems in vitro. IL-12-dependent Th1 differentiation was abrogated by LSF and yielded effector T cells that were deficient in proinflammatory cytokine secretion, including IFN-γ, IL-2, and TNF-α. The diminished Th1 phenotype resulted from both a lower frequency of IL-12-derived Th1 clones and a reduced capacity of individual clones to secrete IFN-γ due to lower levels of IFN-γ mRNA. The arrest in Th1 development resulted from a blockade of IL-12 signaling that preceded the Th0 to Th1 transition. Thus, LSF blocked IL-12-enhanced IFN-γ production in anti-CD3-stimulated T cells and prevented IL-12-mediated repression of the transcription factor GATA-3. Lisofylline also inhibited IL-12-induced increases in STAT4 tyrosine phosphorylation, but did not block TCR signaling or inhibit acquisition of IL-12 responsiveness. These findings were extended to show that LSF also inhibits IL-12-dependent responses in human T cells. LSF, which has one asymmetric chiral center, was selectively inhibitory for IL-12 signaling compared with its S-enantiomer (1501-S) and the oxidized side chain analog, pentoxifylline. The results suggest that LSF may be useful as a modulator of Th1-mediated disease in humans.
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Affiliation(s)
- Michael E. Coon
- Immunology Program, Cell Therapeutics, Inc., Seattle, WA 98119
| | - Michael Diegel
- Immunology Program, Cell Therapeutics, Inc., Seattle, WA 98119
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Bardelle C, Smales C, Ito M, Nomoto K, Wong EY, Kato H, Saeki T, Staddon JM. Phosphodiesterase 4 conformers: preparation of recombinant enzymes and assay for inhibitors. Anal Biochem 1999; 275:148-55. [PMID: 10552898 DOI: 10.1006/abio.1999.4321] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Cyclic nucleotides are key regulators of many cellular processes. Their immediate action is terminated through the activity of phosphodiesterases, a diverse family of enzymes. This diversity has given rise to drug discovery opportunities, and assay technology is therefore of key importance. Inhibitors of the cyclic-AMP-specific phosphodiesterases (the PDE4 family) are drug candidates for a variety of inflammatory disorders. However, PDE4 inhibitors, besides their immunomodulatory effects, also cause side effects including nausea and emesis. Recently, it has been suggested that PDE4 exists in two different conformations with respect to inhibition by the prototypical compound rolipram. Inhibition of the low-affinity conformer is thought to give rise to anti-inflammatory effects, and inhibition of the high-affinity conformer to side effects. Therefore, a selective inhibitor of the low-affinity conformer may have clinical utility. Methods are described to prepare recombinant forms of PDE4B that allow screening for compounds that could preferentially inhibit the low-affinity conformer. Furthermore, conditions for an efficient, scintillation proximity, microtiter plate-based assay are described, providing a considerable advance over previous assays in terms of throughput and automatability.
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Affiliation(s)
- C Bardelle
- Eisai London Research Laboratories Ltd, Bernard Katz Building, University College London, Gower Street, London, WC1E 6BT, United Kingdom
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Ekholm D, Mulloy JC, Gao G, Degerman E, Franchini G, Manganiello VC. Cyclic nucleotide phosphodiesterases (PDE) 3 and 4 in normal, malignant, and HTLV-I transformed human lymphocytes. Biochem Pharmacol 1999; 58:935-50. [PMID: 10509746 DOI: 10.1016/s0006-2952(99)00188-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Intracellular cyclic AMP, determined in part by cyclic nucleotide phosphodiesterases (PDEs), regulates proliferation and immune functions in lymphoid cells. Total PDE, PDE3, and PDE4 activities were measured in phytohemagglutinin (PHA)-activated peripheral blood mononuclear cells (PBMC-PHA), normal natural killer (NK) cells, Jurkat and Kit225-K6 leukemic T-cells, T-cell lines transformed with human T-lymphotropic virus (HTLV)-I (a retrovirus that causes adult T-cell leukemia/lymphoma) and HTLV-II (a nonpathogenic retrovirus), normal B-cells, and B-cells transformed with Epstein-Barr virus (EBV). All cells exhibited PDE3 and PDE4 activities but in different proportions. In EBV-transformed B cells, PDE4 was much higher than PDE3. HTLV-I+ T-cells differed significantly from other T-lymphocyte-derived cells in also having a higher proportion of PDE4 activities, which apparently were not related to selective induction of any one PDE4 mRNA (judged by reverse transcription-polymerase chain reaction) or expression of the HTLV-I regulatory protein Tax. In MJ cells (an HTLV-I+ T-cell line), Jurkat cells, and PBMC-PHA cells, the tyrosine kinase inhibitor herbimycin A strongly inhibited PDE activity. Growth of MJ cells was inhibited by herbimycin A and a protein kinase C (PKC) inhibitor, and was arrested in G1 by rolipram, a specific PDE4 inhibitor. Proliferation of several HTLV-I+ T-cell lines, PBMC-PHA, and Jurkat cells was inhibited differentially by forskolin (which activates adenylyl cyclase), the selective PDE inhibitors cilostamide and rolipram, and the nonselective PDE inhibitors pentoxifylline and isobutyl methylxanthine. These results suggest that PDE4 isoforms may be functionally up-regulated in HTLV-I+ T-cells and may contribute to the virus-induced proliferation, and that PDEs could be therapeutic targets in immune/inflammatory and neoplastic diseases.
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MESH Headings
- 3',5'-Cyclic-AMP Phosphodiesterases/antagonists & inhibitors
- 3',5'-Cyclic-AMP Phosphodiesterases/genetics
- 3',5'-Cyclic-AMP Phosphodiesterases/metabolism
- Adult
- B-Lymphocytes/enzymology
- Benzoquinones
- Cell Division/drug effects
- Cell Line, Transformed/enzymology
- Cell Transformation, Viral
- Colforsin/pharmacology
- Cyclic Nucleotide Phosphodiesterases, Type 3
- Cyclic Nucleotide Phosphodiesterases, Type 4
- Enzyme Inhibitors/pharmacology
- Gene Products, tax/biosynthesis
- Gene Products, tax/metabolism
- Human T-lymphotropic virus 1/physiology
- Humans
- Interleukin-2/metabolism
- Jurkat Cells/enzymology
- Killer Cells, Natural/enzymology
- Lactams, Macrocyclic
- Leukocytes, Mononuclear/enzymology
- Lymphocytes/enzymology
- Lymphocytes/virology
- Protein Kinase Inhibitors
- Quinones/pharmacology
- RNA, Messenger/metabolism
- Reverse Transcriptase Polymerase Chain Reaction
- Rifabutin/analogs & derivatives
- T-Lymphocytes/enzymology
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Affiliation(s)
- D Ekholm
- Pulmonary-Critical Care Medicine Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892-1434, USA
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Suzumura A, Ito A, Yoshikawa M, Sawada M. Ibudilast suppresses TNFalpha production by glial cells functioning mainly as type III phosphodiesterase inhibitor in the CNS. Brain Res 1999; 837:203-12. [PMID: 10434004 DOI: 10.1016/s0006-8993(99)01666-2] [Citation(s) in RCA: 93] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Tumor necrosis factor alpha (TNFalpha) is considered to play a critical role in the development of various pathological processes in the central nervous system (CNS), such as neuronal degeneration, demyelination and HIV-related pathology. In order to search for the agents which suppress TNFalpha production in the CNS for future treatment of these pathological conditions, we examined the effects of ibudilast on TNFalpha production by murine microglia and astrocytes. Some actions of ibudilast are reportedly mediated by inhibition of type IV phosphodiesterase (PDE). Type IV PDE inhibitor has been shown to be the most effective for experimental autoimmune inflammatory demyelination. Therefore, we also determined the subtype of PDE inhibited by ibudilast. Ibudilast significantly and selectively suppressed TNFalpha production by microglia in a dose-dependent manner, without affecting their viability. The inhibition assay indicated that ibudilast is a rather selective inhibitor for type III PDE purified from brain, heart and kidney with moderate inhibitory activity against types I, II and IV PDEs from various tissues. Although it required 10 microM or higher concentrations to effectively suppress TNFalpha production in vitro, the combination of ibudilast with other subtypes of PDE inhibitors synergistically suppressed TNFalpha and nitric oxide production by microglia at 1 microM, a similar concentration that could be obtained in vivo at usual therapeutic dose. Thus, ibudilast, when used in a combination with other PDE inhibitors, will be useful for future strategies to treat intractable neurological diseases in which TNFalpha may play a causative role.
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Affiliation(s)
- A Suzumura
- Department of Neurology, Nara Medical University, Shijo-cho, Kashihara, Nara 634-0813, Japan.
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Abstract
Preclinical and clinical studies of phosphodiesterase 4 inhibitors have shown that these agents may find utility in a wide range of inflammatory disorders, including asthma, chronic obstructive pulmonary disease, atopic dermatitis, rheumatoid arthritis, multiple sclerosis and various neurological disorders. The future of this class of drugs will depend upon the ability to demonstrate a reasonable safety margin against emesis and other typical phosphodieserase (PDE4) side effects, as well as in identification of the inflammatory disorder(s) most relevant to PDE4 inhibition.
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Affiliation(s)
- A M Doherty
- Institut de Recherche Jouveinal/Parke-Davis, 3-9 Rue de la Loge, BP 100, 94265, FRESNES CEDEX, France.
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Santamaria LF, Torres R, Giménez-Arnau AM, Giménez-Camarasa JM, Ryder H, Palacios JM, Beleta J. Rolipram inhibits staphylococcal enterotoxin B-mediated induction of the human skin-homing receptor on T lymphocytes. J Invest Dermatol 1999; 113:82-6. [PMID: 10417623 DOI: 10.1046/j.1523-1747.1999.00639.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The cutaneous lymphocyte-associated antigen defines T lymphocytes with cutaneous tropism under inflammatory conditions. Bacterial infections participate in cutaneous inflammations, such as atopic dermatitis or psoriasis. Bacterial superantigens, such as staphylococcal enterotoxin B, can activate peripheral blood mononuclear cells to induce effector T cells bearing the T cell skin homing receptor cutaneous lymphocyte-associated antigen via enhancement of interleukin-12 production. We have identified and characterized the anti-inflammatory effects of different phosphodiesterase inhibitors on this system. Our data indicate that the selective type 4 phosphodiesterase inhibitor rolipram inhibits the Staphylococcal enterotoxin B-mediated generation of cutaneous lymphocyte-associated antigen positive CD3+ cells from peripheral blood mononuclear cells by reducing interleukin-12 production in a concentration-dependent manner. Conversely, type 3 phosphodiesterase or type 5 phosphodiesterase selective inhibitors were not effective. The rolipram inhibitory effect was on interleukin-12 production, as exogenously added interleukin-12 could revert rolipram suppression. These results suggest that selective type 4 phosphodiesterase inhibition may have beneficial effects on T cell mediated skin inflammatory processes characterized by the presence of bacterial infections, that are thought to exacerbate ongoing skin inflammation.
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Affiliation(s)
- L F Santamaria
- Almirall Prodesfarma S.A. Research Center, Barcelona, Spain
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