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Cruwys S, Hein P, Humphries B, Black D. Drug discovery and development in idiopathic pulmonary fibrosis: challenges and opportunities. Drug Discov Today 2020; 25:2277-2283. [PMID: 33010480 DOI: 10.1016/j.drudis.2020.09.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 08/25/2020] [Accepted: 09/17/2020] [Indexed: 02/07/2023]
Abstract
The pharmacological and adverse effect profiles of the two approved therapies for IPF make the development of new therapies challenging. Considering the similarity of the characteristics of drug candidates to Standard of Care is important in defining positioning and development strategies for this disease.
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Affiliation(s)
- Simon Cruwys
- TherapeutAix UG, Juttastrasse 18, 52066, Aachen, Germany
| | - Peter Hein
- TherapeutAix UG, Juttastrasse 18, 52066, Aachen, Germany
| | - Bob Humphries
- TherapeutAix UG, Juttastrasse 18, 52066, Aachen, Germany
| | - Darcey Black
- TherapeutAix UG, Juttastrasse 18, 52066, Aachen, Germany.
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Rønnow SR, Dabbagh RQ, Genovese F, Nanthakumar CB, Barrett VJ, Good RB, Brockbank S, Cruwys S, Jessen H, Sorensen GL, Karsdal MA, Leeming DJ, Sand JMB. Prolonged Scar-in-a-Jar: an in vitro screening tool for anti-fibrotic therapies using biomarkers of extracellular matrix synthesis. Respir Res 2020; 21:108. [PMID: 32381012 PMCID: PMC7203825 DOI: 10.1186/s12931-020-01369-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2019] [Accepted: 04/22/2020] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND Idiopathic pulmonary fibrosis (IPF) is a rapidly progressing disease with challenging management. To find novel effective therapies, better preclinical models are needed for the screening of anti-fibrotic compounds. Activated fibroblasts drive fibrogenesis and are the main cells responsible for the accumulation of extracellular matrix (ECM). Here, a prolonged Scar-in-a-Jar assay was combined with clinically validated biochemical markers of ECM synthesis to evaluate ECM synthesis over time. To validate the model as a drug screening tool for novel anti-fibrotic compounds, two approved compounds for IPF, nintedanib and pirfenidone, and a compound in development, omipalisib, were tested. METHODS Primary human lung fibroblasts from healthy donors were cultured for 12 days in the presence of ficoll and were stimulated with TGF-β1 with or without treatment with an ALK5/TGF-β1 receptor kinase inhibitor (ALK5i), nintedanib, pirfenidone or the mTOR/PI3K inhibitor omipalisib (GSK2126458). Biomarkers of ECM synthesis were evaluated over time in cell supernatants using ELISAs to assess type I, III, IV, V and VI collagen formation (PRO-C1, PRO-C3, PRO-C4, PRO-C5, PRO-C6), fibronectin (FBN-C) deposition and α-smooth muscle actin (α-SMA) expression. RESULTS TGF-β1 induced synthesis of PRO-C1, PRO-C6 and FBN-C as compared with unstimulated fibroblasts at all timepoints, while PRO-C3 and α-SMA levels were not elevated until day 8. Elevated biomarkers were reduced by suppressing TGF-β1 signalling with ALK5i. Nintedanib and omipalisib were able to reduce all biomarkers induced by TGF-β1 in a concentration dependent manner, while pirfenidone had no effect on α-SMA. CONCLUSIONS TGF-β1 stimulated synthesis of type I, III and VI collagen, fibronectin and α-SMA but not type IV or V collagen. Synthesis was increased over time, although temporal profiles differed, and was modulated pharmacologically by ALK5i, nintedanib, pirfenidone and omipalisib. This prolonged 12-day Scar-in-a-Jar assay utilising biochemical markers of ECM synthesis provides a useful screening tool for novel anti-fibrotic compounds.
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Affiliation(s)
- Sarah Rank Rønnow
- Nordic Bioscience A/S, Herlev, Herlev Hovedgade 205-207, DK-2730, Herlev, Denmark
- Department of Cancer and Inflammation Research, Institute of Molecular Medicine, University of Southern Denmark, Odense, Denmark
| | - Rand Qais Dabbagh
- Nordic Bioscience A/S, Herlev, Herlev Hovedgade 205-207, DK-2730, Herlev, Denmark
| | - Federica Genovese
- Nordic Bioscience A/S, Herlev, Herlev Hovedgade 205-207, DK-2730, Herlev, Denmark
| | | | - Vikki J Barrett
- Department of Fibrosis DPU, Respiratory TA, GlaxoSmithKline, Stevenage, UK
| | - Robert B Good
- Department of Fibrosis DPU, Respiratory TA, GlaxoSmithKline, Stevenage, UK
| | - Sarah Brockbank
- Innovative Medicines Unit, Grünenthal Innovation, Aachen, Germany
- Present Address: Medicines Discovery Catapult, Alderley Edge, Cheshire, UK
| | - Simon Cruwys
- Innovative Medicines Unit, Grünenthal Innovation, Aachen, Germany
- Present Address: TherapeutAix AG, Aachen, Germany
| | - Henrik Jessen
- Nordic Bioscience A/S, Herlev, Herlev Hovedgade 205-207, DK-2730, Herlev, Denmark
| | - Grith Lykke Sorensen
- Department of Cancer and Inflammation Research, Institute of Molecular Medicine, University of Southern Denmark, Odense, Denmark
| | - Morten Asser Karsdal
- Nordic Bioscience A/S, Herlev, Herlev Hovedgade 205-207, DK-2730, Herlev, Denmark
| | - Diana Julie Leeming
- Nordic Bioscience A/S, Herlev, Herlev Hovedgade 205-207, DK-2730, Herlev, Denmark
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Daniels SJ, Leeming DJ, Detlefsen S, Bruun MF, Hjuler ST, Henriksen K, Hein P, Krag A, Karsdal MA, Nielsen MJ, Brockbank S, Cruwys S. Addition of trans fat and alcohol has divergent effects on atherogenic diet-induced liver injury in rodent models of steatohepatitis. Am J Physiol Gastrointest Liver Physiol 2020; 318:G410-G418. [PMID: 31905026 DOI: 10.1152/ajpgi.00066.2019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Nonalcoholic fatty liver disease (NAFLD) and alcoholic liver disease (ALD) are common causes of chronic liver disease. The overlap between ALD and NAFLD suggests the existence of metabolic steatohepatitis. Development of in vivo models that reflect various aspects of human steatohepatitis is essential for drug discovery. We aimed to characterize several models of steatohepatitis (SH) and to investigate whether the pathology could be modulated. Sprague-Dawley rats were fed a high-fat diet (HFD) for 9 wk, followed by either a high-fat, high-cholesterol and cholate diet (HFC) or a HFC diet containing 13% trans fat (HFC-TF). A subset received 15% ethanol-water twice a week for 12 wk. Serum triglycerides, cholesterol, LDL, HDL, aspartate aminotransferase (AST), alanine aminotransferase (ALT), and rodent NH2-terminal propeptide of type III collagen (rPRO-C3) were assessed. The liver was weighed and evaluated using modified Nonalcoholic Steatohepatitis Clinical Research Network histological score system criteria. All diets induced hepatomegaly, but only HFC-TF increased the size of visceral adipose tissue. Trans fat augmented HFC-induced dyslipidemia, and cholesterol was higher and HDL was lower in the HFC-TF groups. Alcohol lowered triglycerides in both dietary groups. HFC elevated ALT and AST, which were lowered by trans fat. All diets induced histological SH, addition of trans fat induced more steatosis but less inflammation. Inclusion of alcohol augmented the HFC-induced inflammation. All diets induced mild fibrosis. Inclusion of trans fat and alcohol significantly increased rPRO-C3. The addition of trans fat reduced the HFC-induced inflammation but augmented steatosis and dyslipidemia. Inclusion of alcohol induced a more inflammatory and fibrogenic phenotype.NEW & NOTEWORTHY Alcoholic liver disease and nonalcoholic liver disease share significant overlap, which suggests the existence of metabolic steatohepatitis. Trans fat has been implicated in steatohepatitis development. Here, we show that the addition of trans fat to an atherogenic diet results in a more steatotic but less inflammatory phenotype, whereas the addition of alcohol to an atherogenic diet augments the inflammatory and fibrogenic properties of the diet.
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Affiliation(s)
- Samuel J Daniels
- Nordic Bioscience Biomarkers and Research, Herlev, Denmark.,Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
| | | | - Sönke Detlefsen
- Department of Pathology, Odense University Hospital, Odense, Denmark
| | - Maria F Bruun
- Department of Pathology, Odense University Hospital, Odense, Denmark
| | - Sara T Hjuler
- Nordic Bioscience Biomarkers and Research, Herlev, Denmark
| | - Kim Henriksen
- Nordic Bioscience Biomarkers and Research, Herlev, Denmark
| | - Peter Hein
- Innovative Medicines Unit, Grünenthal, Aachen, Germany
| | - Aleksander Krag
- Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
| | | | | | | | - Simon Cruwys
- Innovative Medicines Unit, Grünenthal, Aachen, Germany
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Daniels SJ, Leeming DJ, Detlefsen S, Bruun MF, Hjuler ST, Henriksen K, Hein P, Karsdal MA, Brockbank S, Cruwys S. Biochemical and histological characterisation of an experimental rodent model of non-alcoholic steatohepatitis – Effects of a peroxisome proliferator-activated receptor gamma (PPAR-γ) agonist and a glucagon-like peptide-1 analogue. Biomed Pharmacother 2019; 111:926-933. [DOI: 10.1016/j.biopha.2018.12.130] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 12/24/2018] [Accepted: 12/30/2018] [Indexed: 02/06/2023] Open
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Black D, Brockbank S, Cruwys S, Goldenstein K, Hein P, Humphries B. The future R&D landscape in non-alcoholic steatohepatitis (NASH). Drug Discov Today 2019; 24:560-566. [DOI: 10.1016/j.drudis.2018.09.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Revised: 09/06/2018] [Accepted: 09/27/2018] [Indexed: 12/25/2022]
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Hansen NUB, Karsdal MA, Brockbank S, Cruwys S, Rønnow S, Leeming DJ. Tissue turnover of collagen type I, III and elastin is elevated in the PCLS model of IPF and can be restored back to vehicle levels using a phosphodiesterase inhibitor. Respir Res 2016; 17:76. [PMID: 27411390 PMCID: PMC4942917 DOI: 10.1186/s12931-016-0394-8] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Accepted: 06/30/2016] [Indexed: 01/24/2023] Open
Abstract
BACKGROUND The aim of this study was to develop and validate a model for pulmonary fibrosis, using ex vivo tissue cultures of lungs from bleomycin treated animals, enabling the investigation of fibrosis remodeling using novel biomarkers for the detection of ECM protein fragments. The combination of in vivo and ex vivo models together with ECM remodeling markers may provide a translational tool for screening of potential treatments for IPF. METHODS Twenty female Sprague-Dawley rats, twelve weeks of age, were administrated either two doses of bleomycin (BLM) (n = 14) or saline (n = 6) I.T., two days apart. Ten rats were euthanized at day seven and the remaining ten rats at day fourteen, after the last dose. Precision-cut lung slices (PCLS) were made and cultured for 48 h. Ten female Sprague-Dawley rats, twelve weeks of age, were administrated either two doses of BLM (n = 7) or saline (n = 3) I.T., two days apart. The rats were euthanized fourteen days after the last dose. PCLS were made and cultured for 48 h in: medium, medium + 100 μM IBMX (PDE inhibitor), or medium + 10 μM GM6001 (MMP inhibitor). Turnover of type I collagen (P1NP, C1M), type III collagen (iP3NP, C3M) and elastin degradation (ELM7) was measured in the supernatant of the cultured PCLS. RESULTS P1NP, C1M, iP3NP, C3M and ELM7 were significantly increased in supernatants from BLM animals (P ≤ 0.05 - P ≤ 0.0001) when compared to controls. P1NP, C1M, iP3NP, C3M and ELM7 were significantly increased in supernatants from day seven BLM animals compared to day fourteen BLM animals (P ≤ 0.05 - P ≤ 0.0001). P1NP, C1M, iP3NP, C3M and ELM7 were significantly decreased when adding IBMX to the culture medium of fibrotic lung tissue (P ≤ 0.05 - P ≤ 0.0001). C1M, C3M and ELM7 were significantly decreased when adding GM6001 to the culture medium (P ≤ 0.05 - P ≤ 0.0001). Sirius Red and Orcein staining confirmed the presence of collagen and elastin deposition in the lungs of the animals receiving BLM. CONCLUSIONS The protein fingerprint technology allows the assessment of ECM remodeling markers in the BLM PCLS model. By combining in vivo, ex vivo models and the protein fingerprint technology in the fibrotic phase of the model, we believe the chance of translation from animal model to human is markedly increased.
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Affiliation(s)
- Niels Ulrik Brandt Hansen
- />Nordic Bioscience A/S, Herlev Hovedgade 205-207, 2730 Herlev, Denmark
- />University of Southern Denmark, SDU, Odense, Denmark
| | - Morten Asser Karsdal
- />Nordic Bioscience A/S, Herlev Hovedgade 205-207, 2730 Herlev, Denmark
- />University of Southern Denmark, SDU, Odense, Denmark
| | | | | | - Sarah Rønnow
- />Nordic Bioscience A/S, Herlev Hovedgade 205-207, 2730 Herlev, Denmark
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McInnes IB, Cruwys S, Bowers K, Braddock M. Targeting the P2X7 receptor in rheumatoid arthritis: biological rationale for P2X7 antagonism. Clin Exp Rheumatol 2014; 32:878-882. [PMID: 25288220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Accepted: 04/11/2014] [Indexed: 06/03/2023]
Abstract
OBJECTIVES This paper aims to explore the functional significance of the P2X7 receptor in preclinical models of rheumatoid arthritis. METHODS Preclinical studies in vivo were performed using the rat streptococcal cell wall (SCW) arthritis model. Ex vivo cultures of lipopolysaccharide (LPS)/benzoylbenzoyl adenosine triphosphate (BzATP)-stimulated human monocytes were generated to test the activities of a novel, highly specific inhibitor of human P2X7, AZD9056, on interleukin (IL)-1 and IL-18 release. RESULTS P2X7 receptor expression was detected in inflamed synovial tissue after onset of SCW-induced arthritis in rats. Inhibition of P2X7 therein led to reduced articular inflammation and erosive progression. No effect was noted on acute-phase responses. Ex vivo, AZD9056 inhibited IL-1 and IL-18 release to BzATP in LPS-primed human monocytes. CONCLUSIONS P2X7 receptor inhibition could represent a novel approach to the treatment of inflammatory arthritis. However, confirmatory clinical studies are warranted to further explore this possibility.
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Affiliation(s)
- Iain B McInnes
- Glasgow Biomedical Research Centre, University of Glasgow, UK.
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Finch DK, Midha A, Buchanan CL, Cochrane D, Craggs RI, Cruwys S, Grahames C, Kolbeck R, Lowe DC, Maltby J, Pattison DV, Vousden KA, Ward A, Sleeman MA, Mallinder PR. Identification of a potent anti-IL-15 antibody with opposing mechanisms of action in vitro and in vivo. Br J Pharmacol 2011; 162:480-90. [PMID: 20942844 DOI: 10.1111/j.1476-5381.2010.01061.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND AND PURPOSE Interleukin-15 (IL-15) is important in the activation and proliferation of lymphocytic cell populations and is implicated in inflammatory disease. We report the characterization of a novel monoclonal antibody DISC0280 which is specific for human IL-15. EXPERIMENTAL APPROACH DISC0280 was characterized in a direct binding assay of IL-15 with IL-15 receptor α (IL-15Rα) and by its ability to alter IL-15 mediated proliferation of a range of cell lines (cytotoxic T lymphocyte line-2, M-07e, KIT225). A pharmacodynamic model injecting male C57/BL6 mice with IL-15 or IL-15/IL-15Rα, with or without DISC0280, and assessing changes in lymphocytic cell populations and serum cytokines was utilized. KEY RESULTS DISC0280 inhibited the binding of IL-15 to IL-15Rα and also potently inhibits IL-15 dependent proliferation of cells expressing IL-15Rα, shared interleukin 2/ interleukin 15 receptor β chain (IL-15Rβ) and common gamma chain (γ(c) ). DISC0280 also inhibited the IL-15 dependent proliferation of M-07e cells that only express IL-15Rβ/γ(c) subunits. Human IL-15 injected into mice caused an increase in NK1.1(+) and CD3(+) cells in the spleen and peripheral blood and these effects were unexpectedly potentiated by giving DISC0280 with human IL-15. This increase in cells caused by DISC0280/IL-15 co-administration was greater than that observed when IL-15 was administered complexed with soluble IL-15Rα. CONCLUSIONS AND IMPLICATIONS The ability of DISC0280 to bind to the IL-15Rα-binding site on IL-15 allows trans-presentation of IL-15 by DISC0280 in vivo, similar to the trans-presentation by soluble IL-15Rα. DISC0280 may be therefore suitable as a clinical substitute for IL-15.
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Scott I, Midha A, Rashid U, Ball S, Walding A, Kerry P, Delaney S, Cruwys S. Correlation of gene and mediator expression with clinical endpoints in an acute interleukin-1beta-driven model of joint pathology. Osteoarthritis Cartilage 2009; 17:790-7. [PMID: 19010066 DOI: 10.1016/j.joca.2008.09.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2008] [Accepted: 09/30/2008] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Interleukin-1beta (IL-1beta) plays a key role in the pathogenesis of chronic joint diseases, including osteoarthritis (OA), and drives a cascade of inflammatory and destructive responses within the synovial joint. Animal models of arthritis support the role of IL-1beta in joint pathology, however, the molecular changes downstream of IL-1beta are poorly understood in vivo. This study aimed to evaluate the intra-articular (i.a.) injection of IL-1beta in the rat joint as an acute model of joint disease and associate gene and mediator expression with clinical endpoints and pathological changes. METHODS The effects of i.a. administration of a pathologically relevant dose of IL-1beta on joint swelling, mechanical hyperalgesia, histopathology, gene expression and biochemical changes were measured from 2 to 24h. RESULTS IL-1beta-induced joint swelling and mechanical hyperalgesia. Gene expression analysis of joint tissue and biochemical analysis of joint lavage fluid identified pro-inflammatory and destructive mediators induced by IL-1beta. Histopathology of joint tissues showed evidence of synovitis and connective tissue inflammation, but not cartilage destruction. However, biochemical analysis of glucosaminoglycan levels in joint lavage fluids indicated cartilage breakdown and might be a sensitive marker of cartilage pathology. CONCLUSIONS Intra-articular injection of IL-1beta is a reproducible acute model of joint pathology that is potentially useful to evaluate IL-1 pathway inhibitors. The correlation of molecular events with clinical and pathological changes in this model has enhanced the understanding of the role of IL-1beta in joint disease. Methods developed for gene expression analysis using multi-gene microfluidics cards and for biochemical analysis of joint lavage fluid might have utility for characterisation of other arthritis models and corresponding human disease.
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Affiliation(s)
- I Scott
- Department of Molecular Biology, AstraZeneca Charnwood, Loughborough, UK.
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Wilson E, Jackson S, Cruwys S, Kerry P. An evaluation of the immunohistochemistry benefits of boric acid antigen retrieval on rat decalcified joint tissues. J Immunol Methods 2007; 322:137-42. [PMID: 17362980 DOI: 10.1016/j.jim.2007.01.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2006] [Revised: 10/06/2006] [Accepted: 01/24/2007] [Indexed: 10/23/2022]
Abstract
This paper describes the evaluation and optimisation of boric acid antigen retrieval (AR) in rat joint tissue immunohistochemistry (IHC), with reference to two sample IHC targets, CD31 (PECAM-1) and Proliferating Cell Nuclear Antigen (PCNA). Sections of buffered formalin-fixed arthritic tibial/talus joints, decalcified with EDTA, EDTA/formalin or Surgipath(R) Decalcifier I(R), were subjected to one of a number of pre-treatments (none, 0.1% trypsin, 0.2 M acetic acid pH 7.0 or 0.2 M boric acid pH 7.0) and then immunostained for CD31 or PCNA. Of the pre-treatment AR regimens, boric acid gave the most consistent and specific immunostaining of both antigens in joints from the three different decalcification protocols. Satisfactory CD31 and PCNA staining was also achieved in EDTA decalcified joints with no pre-treatment. Likewise, PCNA could be demonstrated in Surgipath(R) decalcified tissue without pre-treatment, albeit at slightly lower staining intensity than achieved following boric acid. The remaining decalcification/pre-treatment conditions were unsatisfactory for IHC of the two antigens investigated because of lack of staining, non-specific staining or consistent loss of sections from the slides. Boric acid pre-treatment provides a valuable alternative low temperature AR method where conventional heat-mediated AR methods are normally required but cannot be used due to tissue type.
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Affiliation(s)
- Elaine Wilson
- Department of Pathology, AstraZeneca R&D Charnwood, Loughborough, Leicestershire, United Kingdom
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Campbell EA, Gentry C, Patel S, Kidd B, Cruwys S, Fox AJ, Urban L. Oral anti-hyperalgesic and anti-inflammatory activity of NK(1) receptor antagonists in models of inflammatory hyperalgesia of the guinea-pig. Pain 2000; 87:253-263. [PMID: 10963905 DOI: 10.1016/s0304-3959(00)00288-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The oral analgesic and anti-inflammatory activity of NK(1) antagonists with species preference for the human receptor were assessed in (1) the carrageenan-induced inflammatory hyperalgesia and (2) Freund's complete adjuvant (FCA)-induced extravasation in the knee joint models of the guinea-pig, respectively. Mechanical hyperalgesia was determined by measuring the withdrawal threshold to a noxious mechanical stimulus applied to the paw and thermal hyperalgesia as the withdrawal latency to a noxious thermal stimulus applied to the plantar surface. A concentration of 1.0% carrageenan (intraplantar) reduced mechanical thresholds from 124+/-5 to 63+/-3 g and thermal latencies from 19+/-0.4 to 4.7+/-0.9 s as determined 4 h after injection. The hyperalgesia persisted for over 24 h. The NK(1) receptor antagonists, SDZ NKT 343, RPR100893 and SR140333, reduced mechanical hyperalgesia by 68, 36 and 27% at a dose of 30 mg kg(-1) p.o., respectively. No further reduction was noted at higher doses (maximum 100 mg kg(-1) p.o.). The anti-hyperalgesic effect of SDZ NKT 343 and RPR100893 peaked at 3 h while SR140333 produced maximal reversal at 1 h after oral administration. D(30) values indicated significant differences between the potency of these compounds. SDZ NKT 343 was by far the most potent anti-hyperalgesic agent (D(30): 1.1 mg kg(-1)). The D(30) values for RPR100893 and SR140333 were estimated to be 17 and >100 mg kg(-1), respectively. In thermal hyperalgesia, SDZ NKT 343 produced a significantly weaker anti-hyperalgesic effect with a peak of 25% reversal. The D(30) value for SDZ NKT 343 was 3.89 mg kg(-1). For comparison, morphine inhibited the carrageenan-induced mechanical and thermal hyperalgesia with an ED(50) of 1.85 and 2.51 mg kg(-1) s.c., respectively. When tested up to 300 mg kg(-1) p.o., aspirin reduced carrageenan-induced mechanical and thermal hyperalgesia by 55.0 and 45.2%, respectively. In addition to the anti-hyperalgesic effects of NK(1) receptor antagonists, the effects of SDZ NKT 343 and RPR100893 on plasma protein extravasation were measured in the FCA-treated knee joint of the guinea-pig. SDZ NKT 343 reversed plasma protein extravasation 2 h after administration by 60% at the oral dose of 30 mg kg(-1). RPR100893 was significantly less effective with a maximum reversal of 30% at 100 mg kg(-1). In comparison, indomethacin produced a 50% reversal at a 10 mg kg(-1) dose. These experiments indicate that the carrageenan-induced hyperalgesia in the guinea-pig may be predictive of analgesic activity of NK(1) receptor antagonists in man. NK(1) receptor antagonists are active anti-hyperalgesic drugs in both mechanical and thermal hyperalgesia in the guinea-pig. In addition they inhibit plasma protein extravasation in the same species. The variability of in vivo potency and efficacy of the NK(1) receptor antagonists in the mechanical hyperalgesia model is difficult to interpret as all compounds are highly effective at blocking the NK(1) receptor in guinea-pig tissues. Amongst several possibilities, differences in pharmacokinetics may explain discrepancies.
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Affiliation(s)
- Elizabeth A Campbell
- Novartis Institute for Medical Sciences, 5 Gower Place, London WC1E 6BN, UK St. Bartholomew's School of Medicine, London, UK
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Abstract
In this study, capsaicin-induced secondary hyperalgesia was assessed as a marker of abnormal nociceptive processing in patients with fibromyalgia (FM). The area of mechanical secondary hyperalgesia induced by a standard solution of capsaicin placed on the volar forearm was measured in ten patients with FM and the results compared to those obtained in ten patients with rheumatoid arthritis (RA) and ten normal subjects. The area of secondary hyperalgesia was found to be substantially increased in both the FM and RA groups compared with controls. In the FM group the area of hyperalgesia correlated with the overall pain score and with the joint tenderness score. The results suggest that in FM there is enhanced sensitivity of nociceptive neurones at a spinal level, thereby supporting the concept of a generalised disturbance of pain modulation in this disorder.
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Affiliation(s)
- V Morris
- Bone and Joint Research Unit, St Bartholomew's and Royal London Hospital School of Medicine, UK
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Malcangio M, Garrett NE, Cruwys S, Tomlinson DR. Nerve growth factor- and neurotrophin-3-induced changes in nociceptive threshold and the release of substance P from the rat isolated spinal cord. J Neurosci 1997; 17:8459-67. [PMID: 9334418 PMCID: PMC6573754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Acute superfusion of nerve growth factor (NGF; 1-100 ng/ml) through a naive rat spinal cord preparation did not alter basal or electrically evoked release of substance P-like immunoreactivity (SP-LI). In contrast, neurotrophin-3 (NT-3; 1-100 ng/ml), although not modifying SP-LI basal outflow, dose-dependently inhibited the electrically evoked, but not capsaicin (10 nM)-induced, release of the peptide. This NT-3 (10 ng/ml)-induced inhibition persisted even in the presence of 100 ng/ml NGF in the perfusion fluid and was still significant when the evoked release of SP-LI was enhanced by a prolonged in vivo treatment with NGF. Co-superfusion with naloxone (0.1 microM), but not CGP 36742 (100 microM), a GABAB antagonist, prevented NT-3 (10 ng/ml) inhibition of SP-LI release. Basal and electrically evoked release of SP-LI from the rat spinal cord in vitro was not modified 24 hr after single systemic injection of either NGF (1 mg/kg) or NT-3 (10 mg/kg). At these time intervals from administration, NGF had induced thermal and mechanical hyperalgesia in the rat hindpaw, and NT-3 had induced mechanical, but not thermal, hypoalgesia. NT-3 administered six times over a 2 week period (at 1 mg/kg) did not alter thermal threshold but significantly reduced electrically evoked release of SP-LI from the spinal cord. An identical treatment regimen with 1 mg/kg NGF induced a significant increase in evoked release of SP-LI. However, this was not associated with a significant hyperalgesia. Although finding that NGF-induced hyperalgesia does not clearly correlate with changes in the release of SP-LI in the spinal cord, this study shows that NT-3 is an inhibitor of SP-LI release and suggests that this mechanism may be responsible for NT-3-induced antinociception.
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Affiliation(s)
- M Malcangio
- Department of Pharmacology, St. Bartholomew's and the Royal London School of Medicine and Dentistry, Queen Mary and Westfield College, London E1 4NS, United Kingdom
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Kidd B, Cruwys S, Mapp P, Blake D. Authors' reply. Ann Rheum Dis 1993. [DOI: 10.1136/ard.52.7.552-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Affiliation(s)
- B L Kidd
- Inflammation Group, London Hospital Medical College, United Kingdom
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Pettipher R, Edwards J, Cruwys S, Jessup E, Beesley J, Henderson B. Pathogenesis of antigen-induced arthritis in mice deficient in neutrophil elastase and cathepsin G. Am J Pathol 1990; 137:1077-82. [PMID: 2240159 PMCID: PMC1877666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The contribution of neutrophil-derived elastase and cathepsin G to joint pathology has been examined in immune arthritis in the mouse. Neutrophils from beige mice are genetically deficient in lysosomal elastase and cathepsin G, but have normal levels of the acid hydrolases, beta-glucuronidase, and N-acetyl-beta-glucosaminidase. The development of antigen-induced arthritis in normal mice has been compared with that in beige mice. The pattern of synovitis (both leukocyte accumulation and plasma leakage) were indistinguishable in normal and beige mice. Cartilage proteoglycan depletion was quantified by measuring the decrease in safranin O staining intensity, and this, too, was unaltered in mice lacking elastase and cathepsin G. These results suggest that neutrophil elastase and cathepsin G do not contribute to these aspects of joint pathology in antigen-induced arthritis in the mouse.
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Affiliation(s)
- R Pettipher
- Department of Pharmacology, Wellcome Research Laboratories, Beckenham, Kent, United Kingdom
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Abstract
Keratocytes from the bovine cornea secrete a factor(s) that stimulates the proliferation of corneal epithelial cells. The novel finding of this study is that this stimulation was only achieved if the epithelial cells were already proliferating. Cells which had stopped growing could not be stimulated to re-enter the growth cycle. This stimulation was not reciprocal; the growth of keratocytes was not stimulated by factor(s) secreted by the epithelium, whereas epithelial factors were able to stimulate the proliferation of thermocytes. The importance of these non-reciprocal growth responses to corneal wound healing and immune response is discussed.
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Affiliation(s)
- T J Jacob
- Department of Pharmacology, St. George's Hospital Medical School, London
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