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Reinisch W, Pradhan V, Ahmad S, Zhang Z, Gale JD. Alternative Endoscopy Reading Paradigms Determine Score Reliability and Effect Size in Ulcerative Colitis. J Crohns Colitis 2024; 18:82-90. [PMID: 37616127 PMCID: PMC10821708 DOI: 10.1093/ecco-jcc/jjad134] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Indexed: 08/25/2023]
Abstract
OBJECTIVE Central reading of endoscopy is advocated by regulatory agencies for clinical trials in ulcerative colitis [UC]. It is uncertain whether the local/site reader should be included in the reading paradigm. We explore whether using locally- and centrally-determined endoscopic Mayo subscores [eMS] provide a reliable final assessment and whether the paradigm used has an impact on effect size. METHODS eMS data from the TURANDOT [NCT01620255] study were used to retrospectively examine seven different reading paradigms (using the scores of local readers [LR], first central readers [CR1], second central readers [CR2], and various consensus reads [ConCR]) by assessing inter-rater reliabilities and their impact on the key study endpoint, endoscopic improvement. RESULTS More than 40% of eMS scores between two trained central readers were discordant. Central readers had wide variability in scorings at baseline (intraclass correlation coefficient [ICC] of 0.475 [0.339, 0.610] for CR1 vs CR2). Centrally-read scores had variable concordance with LR (LR vs CR1 ICC 0.682 [0.575, 0.788], and LR vs CR2 ICC 0.526 [0.399, 0.653]). Reading paradigms with LR and CR which included a consensus, enhanced ICC estimates to >0.8. At Week 12, without the consensus reads, the CR1 vs CR2 ICC estimates were 0.775 [0.710, 0.841], and with consensus reads the ICC estimates were >0.9. Consensus-based approaches were most favourable to detect a treatment difference. CONCLUSION The ICC between the eMS of two trained and experienced central readers is unexpectedly low, which reinforces that currently used central reading processes are still associated with several weaknesses.
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Affiliation(s)
- Walter Reinisch
- Department of Internal Medicine III, Division Gastroenterology & Hepatology, Medical University of Vienna, Vienna, Austria
| | - Vivek Pradhan
- Statistics, Global Biometry and Data Management, Pfizer Inc., 1 Portland St, Cambridge, MA 02139, USA
| | - Saira Ahmad
- Statistics and Programming, Quanticate, Hitchin, UK
| | - Zhen Zhang
- Statistics, Global Biometry and Data Management, Pfizer Inc., 1 Portland St, Cambridge, MA 02139, USA
| | - Jeremy D Gale
- Inflammation and Immunology Research Unit, Pfizer Inc., 1 Portland St, Cambridge, MA 02139, USA
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Martin DA, Telliez JB, Pleasic-Williams S, Zhang Y, Tierney B, Blatnik M, Gale JD, Banfield C, Zhou Y, Lejeune A, Zwillich SH, Stevens E, Tiwari N, Kieras E, Karanam A. Target Occupancy and Functional Inhibition of JAK3 and TEC Family Kinases by Ritlecitinib in Healthy Adults: An Open-Label, Phase 1 Study. J Clin Pharmacol 2024; 64:67-79. [PMID: 37691236 DOI: 10.1002/jcph.2347] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Accepted: 09/01/2023] [Indexed: 09/12/2023]
Abstract
Ritlecitinib is a small molecule in clinical development that covalently and irreversibly inhibits Janus kinase 3 (JAK3) and the TEC family of kinases (BTK, BMX, ITK, TXK, and TEC). This phase 1, open-label, parallel-group study assessed target occupancy and functional effects of ritlecitinib on JAK3 and TEC family kinases in healthy participants aged 18-60 years who received 50 or 200 mg single doses of ritlecitinib on day 1. Blood samples to assess ritlecitinib pharmacokinetics, target occupancy, and pharmacodynamics were collected over 48 hours. Target occupancy was assessed using mass spectroscopy. Functional inhibition of JAK3-dependent signaling was measured by the inhibition of the phosphorylation of its downstream target signal transducer and activator of transcription 5 (pSTAT5), following activation by interleukin 15 (IL-15). The functional inhibition of Bruton's tyrosine kinase (BTK)-dependent signaling was measured by the reduction in the upregulation of cluster of differentiation 69 (CD69), an early marker of B-cell activation, following treatment with anti-immunoglobulin D. Eight participants received one 50 mg ritlecitinib dose and 8 participants received one 200 mg dose. Ritlecitinib plasma exposure increased in an approximately dose-proportional manner from 50 to 200 mg. The maximal median JAK3 target occupancy was 72% for 50 mg and 64% for 200 mg. Ritlecitinib 50 mg had >94% maximal target occupancy of all TEC kinases, except BMX (87%), and 200 mg had >97% for all TEC kinases. For BTK and TEC, ritlecitinib maintained high target occupancy throughout a period of 48 hours. Ritlecitinib reduced pSTAT5 levels following IL-15- and BTK-dependent signaling in a dose-dependent manner. These target occupancy and functional assays demonstrate the dual inhibition of the JAK3- and BTK-dependent pathways by ritlecitinib. Further studies are needed to understand the contribution to clinical effects of inhibiting these pathways.
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Hassan-Zahraee M, Ye Z, Xi L, Dushin E, Lee J, Romatowski J, Leszczyszyn J, Danese S, Sandborn WJ, Banfield C, Gale JD, Peeva E, Longman RS, Hyde CL, Hung KE. Baseline serum and stool microbiome biomarkers predict clinical efficacy and tissue molecular response after ritlecitinib induction therapy in ulcerative colitis. J Crohns Colitis 2023:jjad213. [PMID: 38141256 DOI: 10.1093/ecco-jcc/jjad213] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Indexed: 12/25/2023]
Abstract
BACKGROUND AND AIMS Ritlecitinib, an oral JAK3/TEC family kinase inhibitor, was well- tolerated and efficacious in the phase 2b VIBRATO study in participants with moderate-to-severe ulcerative colitis (UC). The aim of this study was to identify baseline serum and microbiome markers that predict subsequent clinical efficacy and to develop noninvasive serum signatures as potential real-time noninvasive surrogates of clinical efficacy after ritlecitinib. METHODS Tissue and peripheral blood proteomics, transcriptomics, and fecal metagenomics were performed on samples before and after 8-week oral ritlecitinib induction therapy (20 mg, 70 mg, 200 mg, or placebo once daily, N=39, 41, 33, and 18, respectively). Linear mixed models were used to identify baseline and longitudinal protein markers associated with efficacy. The combined predictivity of these proteins was evaluated using a logistic model with permuted efficacy data. Differential expression of fecal metagenomic was used to differentiate responders and nonresponders. RESULTS Peripheral blood serum proteomics identified 4 baseline serum markers (LTA, CCL21, HLA-E, MEGF10) predictive of modified clinical remission (MR), endoscopic improvement (EI), histologic remission (HR), and integrative score of tissue molecular improvement. In responders, 37 serum proteins significantly changed at Week 8 compared with baseline (FDR<0.05); of these, changes in 4 (IL4R, TNFRSF4, SPINK4, and LAIR-1) predicted concurrent EI and HR responses. Fecal metagenomics analysis revealed baseline and treatment response signatures that correlated with EI, MR, and tissue molecular improvement. CONCLUSIONS Blood and microbiome biomarkers stratify endoscopic, histologic, and tissue molecular response to ritlecitinib, which may help guide future precision medicine approaches to UC treatment.
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Affiliation(s)
| | - Zhan Ye
- Pfizer Inc, Cambridge, MA, USA
| | - Li Xi
- Pfizer Inc, Cambridge, MA, USA
| | | | | | - Jacek Romatowski
- Provincial Complex Hospital, Gastroenterology, Bialystok, Poland
| | | | - Silvio Danese
- IRCCS Ospedale San Raffaele and University Vita-Salute San Raffaele, Milan, Italy
| | | | | | | | | | - Randy S Longman
- Weill Cornell Medicine, Division of Gastroenterology and Hepatology, New York, NY, USA
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Sandborn WJ, Danese S, Leszczyszyn J, Romatowski J, Altintas E, Peeva E, Hassan-Zahraee M, Vincent MS, Reddy PS, Banfield C, Salganik M, Banerjee A, Gale JD, Hung KE. Oral Ritlecitinib and Brepocitinib for Moderate-to-Severe Ulcerative Colitis: Results From a Randomized, Phase 2b Study. Clin Gastroenterol Hepatol 2023; 21:2616-2628.e7. [PMID: 36623678 DOI: 10.1016/j.cgh.2022.12.029] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 12/12/2022] [Accepted: 12/20/2022] [Indexed: 01/11/2023]
Abstract
BACKGROUND & AIMS The efficacy and safety of ritlecitinib (oral JAK3/TEC family kinase inhibitor) and brepocitinib (oral TYK2/JAK1 inhibitor) as induction therapy were assessed in patients with active, moderate-to-severe ulcerative colitis. METHODS This phase 2b, parallel-arm, double-blind umbrella study randomized patients with moderate-to-severe ulcerative colitis to receive 8-week induction therapy with ritlecitinib (20, 70, 200 mg), brepocitinib (10, 30, 60 mg), or placebo once daily. The primary endpoint was total Mayo Score (TMS) at week 8. RESULTS Of 319 randomized patients, 317 received ritlecitinib (n = 150), brepocitinib (n = 142), or placebo (n = 25). The placebo-adjusted mean TMSs (90% confidence interval) at week 8 were -2.0 (-3.2 to -0.9), -3.9 (-5.0 to -2.7), and -4.6 (-5.8 to -3.5) for ritlecitinib 20, 70, and 200 mg, respectively (P = .003, P < .001, P < .001), and -1.8 (-2.9 to -0.7), -2.3 (-3.4 to -1.1), and -3.2 (-4.3 to -2.1) for brepocitinib 10, 30, and 60 mg, respectively (P = .009, P = .001, P < .001). Estimates (90% confidence interval) for placebo-adjusted proportions of patients with modified clinical remission at week 8 were 13.7% (0.5%-24.2%), 32.7% (20.2%-45.3%), and 36.0% (23.6%-48.6%) for ritlecitinib 20, 70, and 200 mg, respectively, and 14.6% (1.9%-25.7%), 25.5% (11.0%-38.1%), and 25.5% (11.0%-38.1%) for brepocitinib 10, 30, and 60 mg, respectively. Adverse events were mostly mild, and there were no serious cases of herpes zoster infection. Infections were observed with brepocitinib (16.9% [12.5%-23.7%]), ritlecitinib (8.7% [5.2%-13.4%]), and placebo (4.0% [0.2%-17.6%]). One death due to myocardial infarction (ritlecitinib) and 1 thromboembolic event (brepocitinib) occurred; both were considered unrelated to study drug. CONCLUSIONS Ritlecitinib and brepocitinib induction therapies were more effective than placebo for the treatment of moderate-to-severe active ulcerative colitis, with an acceptable short-term safety profile. CLINICALTRIALS gov number: NCT02958865.
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Affiliation(s)
| | - Silvio Danese
- Gastroenterology and Endoscopy, IRCCS Ospedale San Raffaele and University Vita-Salute San Raffaele, Milan, Italy
| | | | - Jacek Romatowski
- Provincial Complex Hospital, Gastroenterology, Bialystok, Poland
| | | | - Elena Peeva
- Pfizer Global Research and Development, Cambridge, Massachusetts
| | | | | | | | | | - Mikhail Salganik
- Pfizer Inc, Early Clinical Development, Cambridge, Massachusetts
| | | | - Jeremy D Gale
- Pfizer Inc, Early Clinical Development, Cambridge, Massachusetts
| | - Kenneth E Hung
- Pfizer Inc, Early Clinical Development, Cambridge, Massachusetts
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Rosin DL, Hall JP, Zheng S, Huang L, Campos-Bilderback S, Sandoval R, Bree A, Beaumont K, Miller E, Larsen J, Hariri G, Kaila N, Encarnacion IM, Gale JD, van Elsas A, Molitoris BA, Okusa MD. Human Recombinant Alkaline Phosphatase (Ilofotase Alfa) Protects Against Kidney Ischemia-Reperfusion Injury in Mice and Rats Through Adenosine Receptors. Front Med (Lausanne) 2022; 9:931293. [PMID: 35966871 PMCID: PMC9366018 DOI: 10.3389/fmed.2022.931293] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 06/21/2022] [Indexed: 11/26/2022] Open
Abstract
Adenosine triphosphate (ATP) released from injured or dying cells is a potent pro-inflammatory "danger" signal. Alkaline phosphatase (AP), an endogenous enzyme that de-phosphorylates extracellular ATP, likely plays an anti-inflammatory role in immune responses. We hypothesized that ilofotase alfa, a human recombinant AP, protects kidneys from ischemia-reperfusion injury (IRI), a model of acute kidney injury (AKI), by metabolizing extracellular ATP to adenosine, which is known to activate adenosine receptors. Ilofotase alfa (iv) with or without ZM241,385 (sc), a selective adenosine A2A receptor (A2AR) antagonist, was administered 1 h before bilateral IRI in WT, A2AR KO (Adora2a-/- ) or CD73-/- mice. In additional studies recombinant alkaline phosphatase was given after IRI. In an AKI-on-chronic kidney disease (CKD) ischemic rat model, ilofotase alfa was given after the three instances of IRI and rats were followed for 56 days. Ilofotase alfa in a dose dependent manner decreased IRI in WT mice, an effect prevented by ZM241,385 and partially prevented in Adora2a-/- mice. Enzymatically inactive ilofotase alfa was not protective. Ilofotase alfa rescued CD73-/- mice, which lack a 5'-ectonucleotidase that dephosphorylates AMP to adenosine; ZM241,385 inhibited that protection. In both rats and mice ilofotase alfa ameliorated IRI when administered after injury, thus providing relevance for therapeutic dosing of ilofotase alfa following established AKI. In an AKI-on-CKD ischemic rat model, ilofotase alfa given after the third instance of IRI reduced injury. These results suggest that ilofotase alfa promotes production of adenosine from liberated ATP in injured kidney tissue, thereby amplifying endogenous mechanisms that can reverse tissue injury, in part through A2AR-and non-A2AR-dependent signaling pathways.
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Affiliation(s)
- Diane L. Rosin
- Department of Pharmacology, University of Virginia, Charlottesville, VA, United States,*Correspondence: Diane L. Rosin, , orcid.org/0000-0003-0187-5717
| | - J. Perry Hall
- Inflammation and Immunology Research Unit, Pfizer Inc., Cambridge, MA, United States
| | - Shuqiu Zheng
- Division of Nephrology, Center for Immunity, Inflammation and Regeneration, University of Virginia, Charlottesville, VA, United States
| | - Liping Huang
- Division of Nephrology, Center for Immunity, Inflammation and Regeneration, University of Virginia, Charlottesville, VA, United States
| | - Silvia Campos-Bilderback
- Division of Nephrology, Department of Medicine, Indiana University School of Medicine, Indiana Center for Biological Microscopy, Roudebush VA Medical Center, Indianapolis, IN, United States
| | - Ruben Sandoval
- Division of Nephrology, Department of Medicine, Indiana University School of Medicine, Indiana Center for Biological Microscopy, Roudebush VA Medical Center, Indianapolis, IN, United States
| | - Andrea Bree
- Inflammation and Immunology Research Unit, Pfizer Inc., Cambridge, MA, United States
| | - Kevin Beaumont
- BioMedicine Design, Pfizer Inc., Cambridge, MA, United States
| | - Emily Miller
- BioMedicine Design, Pfizer Inc., Groton, CT, United States
| | - Jennifer Larsen
- Early Clinical Development, Pfizer Inc., Groton, CT, United States
| | - Ghazal Hariri
- Drug Product Development, Pfizer Inc., Cambridge, MA, United States
| | - Neelu Kaila
- Medicinal Chemistry, Pfizer Inc., Cambridge, MA, United States
| | - Iain M. Encarnacion
- Division of Nephrology, Center for Immunity, Inflammation and Regeneration, University of Virginia, Charlottesville, VA, United States
| | - Jeremy D. Gale
- Inflammation and Immunology Research Unit, Pfizer Inc., Cambridge, MA, United States
| | | | - Bruce A. Molitoris
- Division of Nephrology, Department of Medicine, Indiana University School of Medicine, Indiana Center for Biological Microscopy, Roudebush VA Medical Center, Indianapolis, IN, United States
| | - Mark D. Okusa
- Division of Nephrology, Center for Immunity, Inflammation and Regeneration, University of Virginia, Charlottesville, VA, United States
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Tehlirian C, Singh RSP, Pradhan V, Roberts ES, Tarabar S, Peeva E, Vincent MS, Gale JD. Oral tyrosine kinase 2 inhibitor PF-06826647 demonstrates efficacy and an acceptable safety profile in participants with moderate-to-severe plaque psoriasis in a phase 2b, randomized, double-blind, placebo-controlled study. J Am Acad Dermatol 2022; 87:333-342. [DOI: 10.1016/j.jaad.2022.03.059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 03/25/2022] [Accepted: 03/29/2022] [Indexed: 10/18/2022]
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Papatheodoridi M, Hall AR, Rodríguez-Perálvarez M, Pieri G, Germani G, Gale JD, Burgess GC, Pinzani M, Dhillon AP, Tsochatzis EA. Histological sub-classification of cirrhosis using collagen proportionate area in patients with chronic hepatitis C. Liver Int 2021; 41:1608-1613. [PMID: 33894106 DOI: 10.1111/liv.14909] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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] [Received: 04/09/2021] [Revised: 04/12/2021] [Accepted: 04/13/2021] [Indexed: 12/22/2022]
Abstract
Collagen proportionate area (CPA, %) is used to quantify liver fibrosis. Here, we assessed CPA performance to sub-classify cirrhosis. CPA was measured in explanted livers from consecutively transplanted patients for hepatitis C virus-related cirrhosis. Model for end-stage liver disease (MELD), Child-Pugh score and decompensating events (ascites, variceal bleeding, non-obstructive jaundice and encephalopathy) were recorded at the time of liver transplant. Of the 154 patients, 24%, 12%, 35%, 24% and 5% had zero, one, two, three and four previous decompensating events. Patients with decompensation had significantly higher CPA than those without (25.1 ± 8.4 vs 15.8 ± 5.5, P < .001). Decompensation was independently associated with CPA, bilirubin and albumin or with CPA and MELD score. CPA did not differ between patients with one, two, three or four decompensating events (22.2 ± 6.3 vs 26.6 ± 8.9 vs 24.5 ± 7.7 vs 24.4 ± 10.9, P = .242). Overall, CPA correlates with the clinical severity of cirrhosis until the advent of decompensation but not with subsequent decompensating events.
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Affiliation(s)
| | - Andrew R Hall
- Academic department of Histopathology, UCL, London, UK
| | | | - Giulia Pieri
- UCL Institute of Liver and Digestive Health, Royal Free Hospital, London, UK
| | - Giacomo Germani
- UCL Institute of Liver and Digestive Health, Royal Free Hospital, London, UK
| | - Jeremy D Gale
- Inflammation and Immunology Research Unit, Pfizer Inc., Cambridge, MA, USA
| | | | - Massimo Pinzani
- UCL Institute of Liver and Digestive Health, Royal Free Hospital, London, UK
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Tehlirian C, Peeva E, Kieras E, Scaramozza M, Roberts ES, Singh RSP, Pradhan V, Banerjee A, Garcet S, Xi L, Gale JD, Vincent MS, Krueger J. Safety, tolerability, efficacy, pharmacokinetics, and pharmacodynamics of the oral TYK2 inhibitor PF-06826647 in participants with plaque psoriasis: a phase 1, randomised, double-blind, placebo-controlled, parallel-group study. Lancet Rheumatol 2021; 3:e204-e213. [PMID: 38279383 DOI: 10.1016/s2665-9913(20)30397-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 11/10/2020] [Accepted: 11/11/2020] [Indexed: 10/22/2022]
Abstract
BACKGROUND Blockade of tyrosine kinase 2 (TYK2) signalling has previously shown therapeutic potential in the treatment of psoriasis. The primary objective of this study was to assess the safety and tolerability of the TYK2 inhibitor PF-06826647. METHODS This phase 1, randomised, double-blind, placebo-controlled, parallel-group study assessed once daily oral dosing of PF-06826647 in participants with plaque psoriasis, at a single clinical research site in the USA. Eligible participants (aged 18-65 years) had plaque psoriasis covering at least 15% of total body surface area and a psoriasis area and severity index (PASI) score of at least 12 at baseline. Participants received PF-06826647 (100 mg or 400 mg), or placebo once daily for 28 days. Using a computer-generated randomisation schedule with a block size of 3, participants were sequentially randomly assigned into two cohorts by the investigator; in the first cohort, participants were randomly assigned in a 2:1 ratio to receive either oral PF-06826647 400 mg or placebo once daily, whereas participants in the second cohort were randomly assigned in a 2:1 ratio to receive either oral PF-06826647 100 mg or placebo once daily. Site, investigator, Pfizer personnel, and participants, were masked to treatment. The primary endpoint was the safety of multiple-dose PF-06826647 in participants with plaque psoriasis. Secondary endpoints were the characterisation of the pharmacokinetics of multiple-dose PF-06826647 in plasma and the change in PASI score at day 28. Safety analysis was done in all participants who received at least one dose of study drug. Efficacy analysis was done in all participants who received at least one dose of randomised study drug, and had a baseline and at least one post-baseline measurement. This study is registered as a randomised, controlled trial with ClinicalTrials.gov, NCT03210961 and is completed. FINDINGS The trial was done between July 14, 2017, and Jan 25, 2019. Overall from 91 participants assessed, 40 participants with moderate-to-severe psoriasis were randomly assigned to treatment (placebo 14 [35%] of 40; PF-06826647 100 mg, 11 [28%] of 40; PF-06826647 400 mg, 15 [38%] of 40). Treatment-emergent adverse events (TEAEs) were reported in 12 (80%) of 15 participants in the PF-06826647 400 mg group, seven (50%) of 14 in the placebo group and five (45%) of 11 in the 100 mg group. All TEAEs were mild in severity, except one moderate TEAE of vomiting reported in the placebo group. There were no deaths, serious TEAEs, severe TEAEs, dose reductions, or temporary discontinuations. Compared with placebo, the change from baseline in PASI score at day 28 showed a significant reduction in least squares mean difference for the PF-06826647 400 mg group (-13·05; 90% CI -18·76 to -7·35; p=0·00077) but not for the PF-06826647 100 mg group (-3·49; -9·48 to 2·50; p=0·33). Both the area under the concentration-time curve over the dosing interval and the maximum concentration increased in a less than dose proportional manner with increasing dose from 100 mg to 400 mg PF-06826647. INTERPRETATION PF-06826647 showed significant improvement in disease activity within 4 weeks of dosing with an acceptable safety profile. PF-06826647 holds promise over conventional oral treatments for psoriasis that have shown limited efficacy or unfavourable safety profiles. FUNDING Pfizer.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - Li Xi
- Pfizer, Cambridge, MA, USA
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9
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Singh RSP, Pradhan V, Roberts ES, Scaramozza M, Kieras E, Gale JD, Peeva E, Vincent MS, Banerjee A, Fensome A, Dowty ME, Winkle P, Tehlirian C. Safety and Pharmacokinetics of the Oral TYK2 Inhibitor PF-06826647: A Phase I, Randomized, Double-Blind, Placebo-Controlled, Dose-Escalation Study. Clin Transl Sci 2021; 14:671-682. [PMID: 33290616 PMCID: PMC7993274 DOI: 10.1111/cts.12929] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 10/25/2020] [Indexed: 12/31/2022] Open
Abstract
Selective inhibition of tyrosine kinase 2 (TYK2) may offer therapeutic promise in inflammatory conditions, with its role in downstream pro-inflammatory cytokine signaling. In this first-in-human study, we evaluated the safety, tolerability, and pharmacokinetics (PK) of a novel TYK2 inhibitor, PF-06826647, in healthy participants. This phase I, randomized, double-blind, placebo-controlled, parallel-group study included two treatment periods (single ascending dose (SAD) and multiple ascending dose (MAD)) in healthy participants and a cohort of healthy Japanese participants receiving 400 mg q.d. or placebo in the MAD period (NCT03210961). Participants were randomly assigned to PF-06826647 or placebo (3:1). Participants received a single oral study drug dose of 3, 10, 30, 100, 200, 400, or 1,600 mg (SAD period), then 30, 100, 400, or 1,200 mg q.d. or 200 mg b.i.d. for 10 days (MAD period). Safety (adverse events (AEs), vital signs, and clinical laboratory parameters), tolerability, and PK were assessed. Overall, 69 participants were randomized to treatment, including six Japanese participants. No deaths, serious AEs, severe AEs, or AEs leading to dose reduction or temporary/permanent discontinuation were observed. All AEs were mild in severity. No clinically relevant laboratory abnormalities or changes in vital signs were detected. PF-06826647 was rapidly absorbed with a median time to maximum plasma concentration of 2 hours in a fasted state, with modest accumulation (< 1.5-fold) after multiple dosing and low urinary recovery. PF-06826647 was well-tolerated, with an acceptable safety profile for doses up to 1,200 mg q.d. for 10 days, supporting further testing in patients.
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Folkersen L, Gustafsson S, Wang Q, Hansen DH, Hedman ÅK, Schork A, Page K, Zhernakova DV, Wu Y, Peters J, Eriksson N, Bergen SE, Boutin TS, Bretherick AD, Enroth S, Kalnapenkis A, Gådin JR, Suur BE, Chen Y, Matic L, Gale JD, Lee J, Zhang W, Quazi A, Ala-Korpela M, Choi SH, Claringbould A, Danesh J, Davey Smith G, de Masi F, Elmståhl S, Engström G, Fauman E, Fernandez C, Franke L, Franks PW, Giedraitis V, Haley C, Hamsten A, Ingason A, Johansson Å, Joshi PK, Lind L, Lindgren CM, Lubitz S, Palmer T, Macdonald-Dunlop E, Magnusson M, Melander O, Michaelsson K, Morris AP, Mägi R, Nagle MW, Nilsson PM, Nilsson J, Orho-Melander M, Polasek O, Prins B, Pålsson E, Qi T, Sjögren M, Sundström J, Surendran P, Võsa U, Werge T, Wernersson R, Westra HJ, Yang J, Zhernakova A, Ärnlöv J, Fu J, Smith JG, Esko T, Hayward C, Gyllensten U, Landen M, Siegbahn A, Wilson JF, Wallentin L, Butterworth AS, Holmes MV, Ingelsson E, Mälarstig A. Genomic and drug target evaluation of 90 cardiovascular proteins in 30,931 individuals. Nat Metab 2020; 2:1135-1148. [PMID: 33067605 PMCID: PMC7611474 DOI: 10.1038/s42255-020-00287-2] [Citation(s) in RCA: 262] [Impact Index Per Article: 65.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Accepted: 09/02/2020] [Indexed: 02/02/2023]
Abstract
Circulating proteins are vital in human health and disease and are frequently used as biomarkers for clinical decision-making or as targets for pharmacological intervention. Here, we map and replicate protein quantitative trait loci (pQTL) for 90 cardiovascular proteins in over 30,000 individuals, resulting in 451 pQTLs for 85 proteins. For each protein, we further perform pathway mapping to obtain trans-pQTL gene and regulatory designations. We substantiate these regulatory findings with orthogonal evidence for trans-pQTLs using mouse knockdown experiments (ABCA1 and TRIB1) and clinical trial results (chemokine receptors CCR2 and CCR5), with consistent regulation. Finally, we evaluate known drug targets, and suggest new target candidates or repositioning opportunities using Mendelian randomization. This identifies 11 proteins with causal evidence of involvement in human disease that have not previously been targeted, including EGF, IL-16, PAPPA, SPON1, F3, ADM, CASP-8, CHI3L1, CXCL16, GDF15 and MMP-12. Taken together, these findings demonstrate the utility of large-scale mapping of the genetics of the proteome and provide a resource for future precision studies of circulating proteins in human health.
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Affiliation(s)
- Lasse Folkersen
- Department of Medicine, Karolinska Institute, Solna, Sweden
- Danish National Genome Center, Copenhagen, Denmark
- SCALLOP consortium
| | - Stefan Gustafsson
- SCALLOP consortium
- Department of Medical Sciences, Molecular Epidemiology and Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Qin Wang
- SCALLOP consortium
- Systems Epidemiology, Baker Heart and Diabetes Institute, Melbourne, Victoria, Australia
- Computational Medicine, Faculty of Medicine, University of Oulu and Biocenter Oulu, Oulu, Finland
| | | | - Åsa K Hedman
- Department of Medicine, Karolinska Institute, Solna, Sweden
- SCALLOP consortium
- Pfizer Worldwide Research, Development and Medical, Cambridge, MA, USA
| | - Andrew Schork
- SCALLOP consortium
- Institute of Biological Psychiatry, Mental Health Center Sct. Hans, Mental Health Services Capital Region, Roskilde, Denmark
- Neurogenomics Division, The Translational Genomics Research Institute (TGEN), Phoenix, AZ, USA
| | - Karen Page
- SCALLOP consortium
- Early Clinical Development, Pfizer Worldwide Research, Development and Medical, Cambridge, MA, USA
| | - Daria V Zhernakova
- SCALLOP consortium
- Department of Genetics, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
| | - Yang Wu
- SCALLOP consortium
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - James Peters
- SCALLOP consortium
- BHF Cardiovascular Epidemiology Unit, Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
- Health Data Research UK Cambridge, Wellcome Genome Campus and University of Cambridge, Cambridge, UK
- Department of Immunology and Inflammation, Faculty of Medicine, Imperial College London, London, UK
| | - Niclas Eriksson
- SCALLOP consortium
- Uppsala Clinical Research Center, Uppsala University, Uppsala, Sweden
| | - Sarah E Bergen
- SCALLOP consortium
- Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Stockholm, Sweden
| | - Thibaud S Boutin
- SCALLOP consortium
- MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Edinburgh, Scotland
| | - Andrew D Bretherick
- SCALLOP consortium
- MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Edinburgh, Scotland
| | - Stefan Enroth
- SCALLOP consortium
- Department of Immunology, Genetics, and Pathology, Biomedical Center, Science for Life Laboratory (SciLifeLab) Uppsala University, Uppsala, Sweden
| | - Anette Kalnapenkis
- SCALLOP consortium
- Estonian Genome Centre, Institute of Genomics, University of Tartu, Tartu, Estonia
- Institute of Molecular and Cell Biology, University of Tartu, Tartu, Estonia
| | - Jesper R Gådin
- Department of Medicine, Karolinska Institute, Solna, Sweden
- SCALLOP consortium
| | - Bianca E Suur
- SCALLOP consortium
- Department of Molecular Medicine and Surgery, Karolinska Institute, Solna, Sweden
| | - Yan Chen
- Department of Medicine, Karolinska Institute, Solna, Sweden
- SCALLOP consortium
| | - Ljubica Matic
- SCALLOP consortium
- Department of Molecular Medicine and Surgery, Karolinska Institute, Solna, Sweden
| | - Jeremy D Gale
- SCALLOP consortium
- Inflammation and Immunology Research Unit, Pfizer Worldwide Research, Development and Medical, Cambridge, MA, USA
| | - Julie Lee
- SCALLOP consortium
- Early Clinical Development, Pfizer Worldwide Research, Development and Medical, Cambridge, MA, USA
| | - Weidong Zhang
- SCALLOP consortium
- Pfizer Global Product Development, Cambridge, MA, USA
| | - Amira Quazi
- SCALLOP consortium
- Early Clinical Development, Pfizer Worldwide Research, Development and Medical, Cambridge, MA, USA
| | - Mika Ala-Korpela
- SCALLOP consortium
- Systems Epidemiology, Baker Heart and Diabetes Institute, Melbourne, Victoria, Australia
- Computational Medicine, Faculty of Medicine, University of Oulu and Biocenter Oulu, Oulu, Finland
- NMR Metabolomics Laboratory, School of Pharmacy, University of Eastern Finland, Kuopio, Finland
| | - Seung Hoan Choi
- SCALLOP consortium
- Program in Medical and Population Genetics, Broad Institute, Cambridge, MA, USA
| | - Annique Claringbould
- SCALLOP consortium
- Department of Genetics, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
| | - John Danesh
- SCALLOP consortium
- BHF Cardiovascular Epidemiology Unit, Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
- Health Data Research UK Cambridge, Wellcome Genome Campus and University of Cambridge, Cambridge, UK
- British Heart Foundation Centre of Research Excellence, University of Cambridge, Cambridge, UK
- National Institute for Health Research Blood and Transplant Research Unit in Donor Health and Genomics, University of Cambridge, Cambridge, UK
- National Institute for Health Research Cambridge Biomedical Research Centre, University of Cambridge and Cambridge University Hospitals, Cambridge, UK
- Department of Human Genetics, Wellcome Sanger Institute, Hinxton, UK
| | - George Davey Smith
- SCALLOP consortium
- MRC Integrative Epidemiology Unit, University of Bristol, Bristol, UK
| | | | - Sölve Elmståhl
- SCALLOP consortium
- Department of Clinical Sciences, Lund University, Skåne University Hospital, Malmö, Sweden
| | - Gunnar Engström
- SCALLOP consortium
- Department of Clinical Sciences, Lund University, Skåne University Hospital, Malmö, Sweden
| | - Eric Fauman
- SCALLOP consortium
- Internal Medicine Research Unit, Pfizer Worldwide Research, Development and Medical, Cambridge, MA, USA
| | - Celine Fernandez
- SCALLOP consortium
- Department of Clinical Sciences, Lund University, Skåne University Hospital, Malmö, Sweden
| | - Lude Franke
- SCALLOP consortium
- Department of Genetics, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
| | - Paul W Franks
- SCALLOP consortium
- Department of Clinical Sciences, Lund University Diabetes Center, Malmö, Sweden
| | - Vilmantas Giedraitis
- SCALLOP consortium
- Department of Public Health and Caring Sciences/Geriatrics, Uppsala University, Uppsala, Sweden
| | - Chris Haley
- SCALLOP consortium
- MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Edinburgh, Scotland
| | - Anders Hamsten
- Department of Medicine, Karolinska Institute, Solna, Sweden
- SCALLOP consortium
| | - Andres Ingason
- SCALLOP consortium
- Institute of Biological Psychiatry, Mental Health Center Sct. Hans, Mental Health Services Capital Region, Roskilde, Denmark
| | - Åsa Johansson
- SCALLOP consortium
- Department of Immunology, Genetics, and Pathology, Biomedical Center, Science for Life Laboratory (SciLifeLab) Uppsala University, Uppsala, Sweden
| | - Peter K Joshi
- SCALLOP consortium
- Centre for Global Health Research, Usher Institute for Population Health Sciences and Informatics, University of Edinburgh, Edinburgh, UK
| | - Lars Lind
- SCALLOP consortium
- Department of Medical Sciences, Uppsala University, Uppsala, Sweden
| | - Cecilia M Lindgren
- SCALLOP consortium
- Program in Medical and Population Genetics, Broad Institute, Cambridge, MA, USA
- Big Data Institute at the Li Ka Shing Centre for Health Information and Discovery, University of Oxford, Oxford, UK
- Wellcome Centre for Human Genetics, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Steven Lubitz
- SCALLOP consortium
- Program in Medical and Population Genetics, Broad Institute, Cambridge, MA, USA
- Cardiovascular Research Center, Massachusetts General Hospital, Boston, MA, USA
| | - Tom Palmer
- SCALLOP consortium
- Department of Mathematics and Statistics, University of Lancaster, Lancaster, UK
| | - Erin Macdonald-Dunlop
- SCALLOP consortium
- Centre for Global Health Research, Usher Institute for Population Health Sciences and Informatics, University of Edinburgh, Edinburgh, UK
| | - Martin Magnusson
- SCALLOP consortium
- Department of Cardiology, Skåne University Hospital Malmö, Malmö, Sweden
- Wallenberg Center for Molecular Medicine, Lund University, Lund, Sweden
- North-West University, Hypertension in Africa Research Team (HART), Potchefstroom, South Africa
| | - Olle Melander
- SCALLOP consortium
- Department of Clinical Sciences, Lund University, Skåne University Hospital, Malmö, Sweden
| | - Karl Michaelsson
- SCALLOP consortium
- Department of Surgical Sciences, Uppsala University, Uppsala, Sweden
| | - Andrew P Morris
- SCALLOP consortium
- Wellcome Centre for Human Genetics, Nuffield Department of Medicine, University of Oxford, Oxford, UK
- Centre for Genetics and Genomics Versus Arthritis, Centre for Musculoskeletal Research, Division of Musculoskeletal and Dermatological Sciences, University of Manchester, Manchester, UK
- Department of Biostatistics, University of Liverpool, Liverpool, UK
| | - Reedik Mägi
- SCALLOP consortium
- Estonian Genome Centre, Institute of Genomics, University of Tartu, Tartu, Estonia
| | - Michael W Nagle
- SCALLOP consortium
- Internal Medicine Research Unit, Pfizer Worldwide Research, Development and Medical, Cambridge, MA, USA
| | - Peter M Nilsson
- SCALLOP consortium
- Department of Clinical Sciences, Lund University, Skåne University Hospital, Malmö, Sweden
| | - Jan Nilsson
- SCALLOP consortium
- Department of Clinical Sciences, Lund University, Skåne University Hospital, Malmö, Sweden
| | - Marju Orho-Melander
- SCALLOP consortium
- Department of Clinical Sciences, Clinical Research Center, Lund University, Malmö, Sweden
| | - Ozren Polasek
- SCALLOP consortium
- Faculty of Medicine, University of Split, Split, Croatia
| | - Bram Prins
- SCALLOP consortium
- BHF Cardiovascular Epidemiology Unit, Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
- Health Data Research UK Cambridge, Wellcome Genome Campus and University of Cambridge, Cambridge, UK
| | - Erik Pålsson
- SCALLOP consortium
- Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden
| | - Ting Qi
- SCALLOP consortium
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Marketa Sjögren
- SCALLOP consortium
- Department of Clinical Sciences, Lund University, Skåne University Hospital, Malmö, Sweden
| | - Johan Sundström
- SCALLOP consortium
- Department of Medical Sciences, Clinical Epidemiology, Uppsala University, Uppsala, Sweden
- The George Institute for Global Health, University of New South Wales, Sydney, New South Wales, Australia
| | - Praveen Surendran
- SCALLOP consortium
- BHF Cardiovascular Epidemiology Unit, Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
- Health Data Research UK Cambridge, Wellcome Genome Campus and University of Cambridge, Cambridge, UK
- British Heart Foundation Centre of Research Excellence, University of Cambridge, Cambridge, UK
- Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
| | - Urmo Võsa
- SCALLOP consortium
- Estonian Genome Centre, Institute of Genomics, University of Tartu, Tartu, Estonia
| | - Thomas Werge
- SCALLOP consortium
- Institute of Biological Psychiatry, Mental Health Center Sct. Hans, Mental Health Services Capital Region, Roskilde, Denmark
| | | | - Harm-Jan Westra
- SCALLOP consortium
- Department of Genetics, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
| | - Jian Yang
- SCALLOP consortium
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
- Institute for Advanced Research, Wenzhou Medical University, Wenzhou, China
- School of Life Sciences, Westlake University, Hangzhou, Zhejiang, China
| | - Alexandra Zhernakova
- SCALLOP consortium
- Department of Genetics, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
| | - Johan Ärnlöv
- SCALLOP consortium
- Department of Neurobiology, Care Sciences and Society (NVS) Division of Family Medicine and Primary Care, Karolinska Institute, Solna, Sweden
| | - Jingyuan Fu
- SCALLOP consortium
- Department of Genetics, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
- Department of Paediatrics, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - J Gustav Smith
- SCALLOP consortium
- Wallenberg Center for Molecular Medicine, Lund University, Lund, Sweden
- Department of Cardiology, Clinical Sciences, Lund University and Skåne University Hospital, Lund, Sweden
| | - Tõnu Esko
- SCALLOP consortium
- Estonian Genome Centre, Institute of Genomics, University of Tartu, Tartu, Estonia
- Program in Medical and Population Genetics, Broad Institute, Cambridge, MA, USA
| | - Caroline Hayward
- SCALLOP consortium
- MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Edinburgh, Scotland
| | - Ulf Gyllensten
- SCALLOP consortium
- Department of Immunology, Genetics, and Pathology, Biomedical Center, Science for Life Laboratory (SciLifeLab) Uppsala University, Uppsala, Sweden
| | - Mikael Landen
- SCALLOP consortium
- Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden
| | - Agneta Siegbahn
- SCALLOP consortium
- Department of Medical Sciences, Clinical Chemistry, Uppsala University, Uppsala, Sweden
| | - James F Wilson
- SCALLOP consortium
- MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Edinburgh, Scotland
- Centre for Global Health Research, Usher Institute for Population Health Sciences and Informatics, University of Edinburgh, Edinburgh, UK
| | - Lars Wallentin
- SCALLOP consortium
- Department of Medical Sciences, Cardiology and Uppsala Clinical Research Center, Uppsala University, Uppsala, Sweden
| | - Adam S Butterworth
- SCALLOP consortium
- BHF Cardiovascular Epidemiology Unit, Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
- Health Data Research UK Cambridge, Wellcome Genome Campus and University of Cambridge, Cambridge, UK
- British Heart Foundation Centre of Research Excellence, University of Cambridge, Cambridge, UK
- National Institute for Health Research Blood and Transplant Research Unit in Donor Health and Genomics, University of Cambridge, Cambridge, UK
- National Institute for Health Research Cambridge Biomedical Research Centre, University of Cambridge and Cambridge University Hospitals, Cambridge, UK
| | - Michael V Holmes
- SCALLOP consortium
- Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), Nuffield Department of Population Health, University of Oxford, Oxford, UK
- Medical Research Council Population Health Research Unit at the University of Oxford, Oxford, UK
| | - Erik Ingelsson
- SCALLOP consortium
- Department of Medicine, Division of Cardiovascular Medicine, Falk Cardiovascular Research Center, Stanford University School of Medicine, Stanford, CA, USA
| | - Anders Mälarstig
- Department of Medicine, Karolinska Institute, Solna, Sweden.
- SCALLOP consortium, .
- Emerging Science & Innovation, Pfizer Worldwide Research, Development and Medical, Cambridge, MA, USA.
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11
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Porter AC, Aubrecht J, Birch C, Braun J, Cuff C, Dasgupta S, Gale JD, Hinton R, Hoffmann SC, Honig G, Linggi B, Schito M, Casteele NV, Sauer JM. Biomarkers of Crohn's Disease to Support the Development of New Therapeutic Interventions. Inflamm Bowel Dis 2020; 26:1498-1508. [PMID: 32840322 PMCID: PMC7500523 DOI: 10.1093/ibd/izaa215] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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] [Received: 06/03/2020] [Indexed: 12/18/2022]
Abstract
BACKGROUND Currently, 2 coprimary end points are used by health authorities to determine the effectiveness of therapeutic interventions in patients with Crohn's disease (CD): symptomatic remission (patient-reported outcome assessment) and endoscopic remission (ileocolonoscopy). However, there is lack of accepted biomarkers to facilitate regulatory decision-making in the development of novel therapeutics for the treatment of CD. METHODS With support from the Helmsley Charitable Trust, Critical Path Institute formed the Crohn's Disease Biomarkers preconsortium (CDBpC) with members from the pharmaceutical industry, academia, and nonprofit organizations to evaluate the CD biomarker landscape. Biomarkers were evaluated based on biological relevance, availability of biomarker assays, and clinical validation data. RESULTS The CDBpC identified the most critical need as pharmacodynamic/response biomarkers to monitor disease activity in response to therapeutic intervention. Fecal calprotectin (FC) and serum C-reactive protein (CRP) were identified as biomarkers ready for the regulatory qualification process. A number of exploratory biomarkers and potential panels of these biomarkers was also identified for additional development. Given the different factors involved in CD and disease progression, a combination of biomarkers, including inflammatory, tissue injury, genetic, and microbiome-associated biomarkers, will likely have the most utility. CONCLUSIONS The primary focus of the Inflammatory Bowel Disease Regulatory Science Consortium will be development of exploratory biomarkers and the qualification of FC and CRP for IBD. The Inflammatory Bowel Disease Regulatory Science Consortium, focused on tools to support IBD drug development, will operate in the precompetitive space to share data, biological samples for biomarker testing, and assay information for novel biomarkers.
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Affiliation(s)
| | | | | | | | | | | | - Jeremy D Gale
- Pfizer Worldwide, Research, Development and Medical, Cambridge, MA, USA
| | - Robert Hinton
- The David R Clare and Margaret C Clare Foundation, Morristown, NJ, USA
| | | | | | | | | | - Niels Vande Casteele
- Department of Medicine, University of California San Diego, CA, USA,Robarts Clinical Trials Inc., London, ON, Canada
| | - John-Michael Sauer
- Critical Path Institute, AZ, USA,Address correspondence to: John-Michael Sauer, Critical Path Institute, 1730 E. River Rd Suite 200, Tucson, Arizona 85718, USA. E-mail:
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12
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Silvestri A, Ataman E, Budi A, Stipp SLS, Gale JD, Raiteri P. Wetting Properties of the CO 2-Water-Calcite System via Molecular Simulations: Shape and Size Effects. Langmuir 2019; 35:16669-16678. [PMID: 31714788 DOI: 10.1021/acs.langmuir.9b02881] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Assessment of the risks and environmental impacts of carbon geosequestration requires knowledge about the wetting behavior of mineral surfaces in the presence of CO2 and the pore fluids. In this context, the interfacial tension (IFT) between CO2 and the aqueous fluid and the contact angle, θ, with the pore mineral surfaces are the two key parameters that control the capillary pressure in the pores of the candidate host rock. Knowledge of these two parameters and their dependence on the local conditions of pressure, temperature, and salinity is essential for the correct prediction of structural and residual trapping. We have performed classical molecular dynamics simulations to predict the CO2-water IFT and the CO2-water-calcite contact angle. The IFT results are consistent with previous simulations, where simple point charge water models have been shown to underestimate the water surface tension, thus affecting the simulated IFT values. When combined with the EPM2 CO2 model, the SPC/Fw water model indeed underestimates the IFT in the low-pressure region at all temperatures studied. On the other hand, at high pressure and low temperature, the IFT is overestimated by ∼5 mN/m. Literature data regarding the CO2/water/calcite contact angle on calcite are contradictory. Using our new set of force field parameters, we performed NVT simulations at 323 K and 20 MPa to calculate the contact angle of a water droplet on the calcite {10.4} surface in a CO2 atmosphere. We performed simulations for both spherical and cylindrical droplet configurations for different initial radii to study the size dependence of the water contact angle on calcite in the presence of CO2. Our results suggest that the contact angle of a cylindrical droplet, is independent of droplet size, for droplets with a radius of 50 Å or more. On the contrary, spherical droplets make a contact angle that is strongly influenced by their size. At the largest size explored in this study, both spherical and cylindrical droplets converge to the same contact angle, 38°, indicating that calcite is strongly wetted by water.
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Affiliation(s)
- A Silvestri
- Curtin Institute for Computation, The Institute for Geoscience Research (TIGeR), School of Molecular and Life Sciences , Curtin University , PO Box U1987, Perth , WA 6845 , Australia
| | - E Ataman
- Nano-Science Center, Department of Chemistry , University of Copenhagen , Universitetsparken 5 , København Ø DK-2100 , Denmark
| | - A Budi
- Institute for Frontier Materials , Deakin University , Geelong , VIC 3216 , Australia
| | - S L S Stipp
- Department of Physics , Technical University of Denmark , Fysikvej , DK-2800 Kongens Lyngby , Denmark
| | - J D Gale
- Curtin Institute for Computation, The Institute for Geoscience Research (TIGeR), School of Molecular and Life Sciences , Curtin University , PO Box U1987, Perth , WA 6845 , Australia
| | - P Raiteri
- Curtin Institute for Computation, The Institute for Geoscience Research (TIGeR), School of Molecular and Life Sciences , Curtin University , PO Box U1987, Perth , WA 6845 , Australia
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13
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Gale JD, Gilbert S, Blumenthal S, Elliott T, Pergola PE, Goteti K, Scheele W, Perros-Huguet C. Effect of PF-04634817, an Oral CCR2/5 Chemokine Receptor Antagonist, on Albuminuria in Adults with Overt Diabetic Nephropathy. Kidney Int Rep 2018; 3:1316-1327. [PMID: 30450458 PMCID: PMC6224665 DOI: 10.1016/j.ekir.2018.07.010] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 05/22/2018] [Accepted: 07/02/2018] [Indexed: 01/09/2023] Open
Abstract
Introduction Inflammatory cell recruitment, which is potentially mediated by the monocyte chemoattractant protein 1/C-C chemokine receptor type 2 (CCR2) system and by C-C chemokine receptor type 5 (CCR5) activity, may play a role in the development and progression of diabetic nephropathy. PF-04634817 is a dual chemokine CCR2/5 receptor antagonist that is being developed for the treatment of diabetic nephropathy. Methods We evaluated the efficacy of PF-04634817 compared with matching placebo for reduction of albuminuria after 12 weeks of treatment in subjects with type 2 diabetes who received standard of care (SOC; angiotensin-converting enzyme inhibitor or angiotensin receptor blocker therapy), in a randomized, double-blind, placebo-controlled, parallel-group phase 2 study. Results A total of 226 subjects who received SOC with baseline estimated glomerular filtration rates between 20 and 75 ml/min per 1.73 m2 and a baseline urinary albumin-to-creatinine ratio (UACR) of ≥300 mg/g were randomly assigned 3:1 to receive PF-04634817 (150 or 200 mg orally, once daily) or placebo. The primary analysis was Bayesian, with an informative prior for placebo response (equivalent to including an additional 80 subjects in the placebo arm). We observed a placebo-adjusted reduction in UACR of 8.2% (ratio 0.918; 95% credible interval: 0.75–1.09) at week 12 in the PF-04634817 arm. PF-04634817 appeared to be safe and well-tolerated. Conclusion Despite the good safety profile shown by PF-04634817, clinical development for this indication was discontinued in light of the modest efficacy observed.
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Affiliation(s)
- Jeremy D Gale
- Inflammation and Immunology Research Unit, Pfizer Inc, Cambridge, Massachusetts, USA
| | - Steven Gilbert
- Early Clinical Development, Pfizer Inc, Cambridge, Massachusetts, USA
| | - Samuel Blumenthal
- Department of Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin, USA
| | - Tom Elliott
- BC Diabetes, Vancouver, British Columbia, Canada
| | | | - Kosalaram Goteti
- Early Clinical Development, Pfizer Inc, Cambridge, Massachusetts, USA
| | - Wim Scheele
- Clinical Development and Operations, Pfizer Inc, Cambridge, Massachusetts, USA
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14
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Gale JD, Berger B, Gilbert S, Popa S, Sultan MB, Schachar RA, Girgenti D, Perros-Huguet C. A CCR2/5 Inhibitor, PF-04634817, Is Inferior to Monthly Ranibizumab in the Treatment of Diabetic Macular Edema. ACTA ACUST UNITED AC 2018; 59:2659-2669. [DOI: 10.1167/iovs.17-22731] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- Jeremy D. Gale
- Inflammation and Immunology Research Unit, Pfizer, Inc., Cambridge, Massachusetts, United States
| | - Brian Berger
- Retina Research Center, Austin, Texas, United States
| | - Steven Gilbert
- Early Clinical Development, Pfizer, Inc., Cambridge, Massachusetts, United States
| | - Serghei Popa
- Department of Rheumatology and Nephrology, State University of Medicine and Pharmacy, N. Testemitanu, Chisinau, Moldova
| | - Marla B. Sultan
- Global Product Development, Pfizer, Inc., New York, New York, United States
| | - Ronald A. Schachar
- Clinical Affairs, Pfizer Essential Health, Pfizer, Inc., San Diego, California, United States
| | - Douglas Girgenti
- Global Product Development, Pfizer, Inc., New York, New York, United States
| | - Christelle Perros-Huguet
- Inflammation and Immunology Research Unit, Pfizer, Inc., Cambridge, Massachusetts, United States
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15
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Walley RJ, Smith CL, Gale JD, Woodward P. Advantages of a wholly Bayesian approach to assessing efficacy in early drug development: a case study. Pharm Stat 2015; 14:205-15. [PMID: 25865949 DOI: 10.1002/pst.1675] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2014] [Revised: 11/12/2014] [Accepted: 02/17/2015] [Indexed: 01/21/2023]
Abstract
This paper illustrates how the design and statistical analysis of the primary endpoint of a proof-of-concept study can be formulated within a Bayesian framework and is motivated by and illustrated with a Pfizer case study in chronic kidney disease. It is shown how decision criteria for success can be formulated, and how the study design can be assessed in relation to these, both using the traditional approach of probability of success conditional on the true treatment difference and also using Bayesian assurance and pre-posterior probabilities. The case study illustrates how an informative prior on placebo response can have a dramatic effect in reducing sample size, saving time and resource, and we argue that in some cases, it can be considered unethical not to include relevant literature data in this way.
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Affiliation(s)
| | - Claire L Smith
- Eli Lilly and Company Limited, Erl Wood Manor, Windlesham, GU20 6PH, UK
| | | | - Phil Woodward
- Pfizer, Neusentis, The Portway Building, Granta Park, Cambridge, CB21 6GS, UK
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Gale JD, Houghton LA. Alpha 2 Delta (α(2)δ) Ligands, Gabapentin and Pregabalin: What is the Evidence for Potential Use of These Ligands in Irritable Bowel Syndrome. Front Pharmacol 2011; 2:28. [PMID: 21713059 PMCID: PMC3114047 DOI: 10.3389/fphar.2011.00028] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2011] [Accepted: 05/29/2011] [Indexed: 12/12/2022] Open
Abstract
Irritable bowel syndrome (IBS) is a complex disorder that is characterized by abdominal pain and altered bowel habit, and often associates with other gastrointestinal symptoms such as feelings of incomplete bowel movement and abdominal bloating, and extra-intestinal symptoms such as headache, dyspareunia, heartburn, muscle pain, and back pain. It also frequently coexists with conditions that may also involve central sensitization processes, such as fibromyalgia, irritable bladder disorder, and chronic cough. This review examines the evidence to date on gabapentin and pregabalin which may support further and continued research and development of the α2δ ligands in disorders characterized by visceral hypersensitivity, such as IBS. The distribution of the α2δ subunit of the voltage-gated calcium channel, possible mechanisms of action, pre-clinical data which supports an effect on motor–sensory mechanisms and clinical evidence that points to potential benefits in patients with IBS will be discussed.
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Affiliation(s)
- Jeremy D Gale
- Clinical Research, Pfizer Global Research and Development Sandwich, UK
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17
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Ohashi-Doi K, Gale JD, Kurebayashi Y. Pregabalin inhibits accelerated defecation and decreased colonic nociceptive threshold in sensitized rats. Eur J Pharmacol 2010; 643:107-12. [DOI: 10.1016/j.ejphar.2010.06.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2009] [Revised: 05/19/2010] [Accepted: 06/07/2010] [Indexed: 01/14/2023]
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Ferens DM, Yin L, Ohashi-Doi K, Habgood M, Bron R, Brock JA, Gale JD, Furness JB. Evidence for functional ghrelin receptors on parasympathetic preganglionic neurons of micturition control pathways in the rat. Clin Exp Pharmacol Physiol 2010; 37:926-32. [DOI: 10.1111/j.1440-1681.2010.05409.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Ohashi-Doi K, Himaki D, Nagao K, Kawai M, Gale JD, Furness JB, Kurebayashi Y. A selective, high affinity 5-HT 2B receptor antagonist inhibits visceral hypersensitivity in rats. Neurogastroenterol Motil 2010; 22:e69-76. [PMID: 19740115 DOI: 10.1111/j.1365-2982.2009.01395.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [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] [Indexed: 02/04/2023]
Abstract
BACKGROUND RS-127445 is a selective, high affinity 5-HT(2B)receptor antagonist. We investigated whether 5-HT(2B)receptor antagonists can reduce colonic visceral hypersensitivity caused by restraint stress or by proximal colonic inflammation. METHODS Visceral hypersensitivity was induced in rats by either restraint stress or injection of 2, 4, 6-trinitrobenzene sulfonic acid (TNBS) into the proximal colon. Restraint stress produced a significant increase in numbers of abdominal contractions evoked by colorectal distension (CRD), measured as a quantitative index of visceral nociception in rats. Seven days after TNBS injection, the pain threshold to CRD at the non-inflamed distal colon, that was determined as the minimum pressure required to evoke abdominal cramp, was significantly decreased. The effect of RS-127445 on visceral hypersensitivity was assessed in either naïve or TNBS-treated rats. KEY RESULTS Oral administration of a selective, high affinity 5-HT(2B)receptor antagonist, RS-127445, significantly inhibited visceral hypersensitivity provoked by restraint stress (35 to 74% inhibition at 1 to 10 mg kg(-1)). Oral RS-127445 produced a significant suppression of TNBS-induced visceral hypersensitivity (15 to 62% inhibition at 3 to 30 mg kg(-1)), although it was without significant effect on the visceral nociceptive threshold of naïve rats. RS-127445 (1 to 30 mg kg(-1), p.o.) also dose-dependently reduced the restraint stress-induced defecation in naïve and TNBS-treated rats. CONCLUSIONS & INFERENCES These results suggest that 5-HT(2B)receptors are involved in signaling from the colon in rats in which there is visceral hypersensitivity and that a selective 5-HT(2B)receptor antagonist could have therapeutic potential for the treatment of gut disorders characterized by visceral hypersensitivity.
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Affiliation(s)
- K Ohashi-Doi
- Discovery Research, Nagoya Laboratories, Pfizer Global Research and Development, Aichi, Japan.
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20
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Artacho E, Anglada E, Diéguez O, Gale JD, García A, Junquera J, Martin RM, Ordejón P, Pruneda JM, Sánchez-Portal D, Soler JM. The SIESTA method; developments and applicability. J Phys Condens Matter 2008; 20:064208. [PMID: 21693870 DOI: 10.1088/0953-8984/20/6/064208] [Citation(s) in RCA: 183] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Recent developments in and around the SIESTA method of first-principles simulation of condensed matter are described and reviewed, with emphasis on (i) the applicability of the method for large and varied systems, (ii) efficient basis sets for the standards of accuracy of density-functional methods, (iii) new implementations, and (iv) extensions beyond ground-state calculations.
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Affiliation(s)
- Emilio Artacho
- Department of Chemistry, University of California, Berkeley, CA 94720, USA. Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK
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21
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Artacho E, Anglada E, Diéguez O, Gale JD, García A, Junquera J, Martin RM, Ordejón P, Pruneda JM, Sánchez-Portal D, Soler JM. The SIESTA method; developments and applicability. J Phys Condens Matter 2008; 20:064208. [PMID: 21693870 DOI: 10.1088/0953-8984/14/11/302] [Citation(s) in RCA: 2767] [Impact Index Per Article: 172.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Recent developments in and around the SIESTA method of first-principles simulation of condensed matter are described and reviewed, with emphasis on (i) the applicability of the method for large and varied systems, (ii) efficient basis sets for the standards of accuracy of density-functional methods, (iii) new implementations, and (iv) extensions beyond ground-state calculations.
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Affiliation(s)
- Emilio Artacho
- Department of Chemistry, University of California, Berkeley, CA 94720, USA. Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK
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22
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Houghton LA, Fell C, Whorwell PJ, Jones I, Sudworth DP, Gale JD. Effect of a second-generation alpha2delta ligand (pregabalin) on visceral sensation in hypersensitive patients with irritable bowel syndrome. Gut 2007; 56:1218-25. [PMID: 17446306 PMCID: PMC1954959 DOI: 10.1136/gut.2006.110858] [Citation(s) in RCA: 161] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2006] [Revised: 04/03/2007] [Accepted: 04/11/2007] [Indexed: 12/24/2022]
Abstract
BACKGROUND Visceral hypersensitivity is an important pathophysiological factor in irritable bowel syndrome (IBS). Pre-clinical studies suggest that the alpha(2)delta ligand pregabalin reduces both visceral allodynia and hyperalgesia, but is inactive on basal sensitivity. AIM To assess the effect of pregabalin on the perception of rectal distension in hypersensitive IBS patients. METHODS Twenty-six patients with Rome-II-defined IBS (aged 18-46 years, 7 male) were included in a randomized, double-blind, placebo-controlled, parallel-group study in which they received either 3 weeks oral pregabalin (titrated: 50 mg tid days 1-3, 100 mg tid days 4-7, 150 mg tid days 8-11; fixed 200 mg tid days 12-21 +/-4) or placebo control. Rectal sensitivity was assessed using a barostat technique, in which sensory thresholds were determined using the ascending method of limits, followed by tracking both before and after treatment. Only patients with a pain threshold of RESULTS Pregabalin significantly increased the sensory thresholds from baseline for first sensation (p = 0.045), desire to defecate (p = 0.008) and pain (p = 0.048) compared with placebo control. In addition, pregabalin significantly increased rectal compliance (p<0.0001), although this appeared to be unrelated to the changes in sensitivity. Despite the occurrence of mild dizziness and somnolence, pregabalin was generally well tolerated. CONCLUSIONS Pregabalin increased distension sensory thresholds to normal levels in IBS patients with rectal hypersensitivity. A concomitant increase in rectal compliance appeared to be unrelated to the reduction in sensitivity. These data suggest that alpha(2)delta ligands are worthy of further investigation in the treatment of visceral pain disorders, including IBS.
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Affiliation(s)
- L A Houghton
- Neurogastroenterology Unit, Academic Division of Medicine and Surgery, University of Manchester, Wythenshawe Hospital, Southmoor Road, Wythenshawe, Manchester M23 9LT, UK.
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Gale JD, O’Neill BT, Humphrey JM. Tachykinin NK1receptor antagonists for the control of chemotherapy-induced nausea and vomiting. Expert Opin Ther Pat 2005. [DOI: 10.1517/13543776.11.12.1837] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Banner KH, Cattaneo C, Le Net JL, Popovic A, Collins D, Gale JD. Macroscopic, microscopic and biochemical characterisation of spontaneous colitis in a transgenic mouse, deficient in the multiple drug resistance 1a gene. Br J Pharmacol 2004; 143:590-8. [PMID: 15466445 PMCID: PMC1575434 DOI: 10.1038/sj.bjp.0705982] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2004] [Revised: 08/16/2004] [Accepted: 08/23/2004] [Indexed: 01/01/2023] Open
Abstract
1 A novel animal model of spontaneous colonic inflammation, the multiple drug-resistant (mdr1) a(-/-) mouse, was identified by Panwala and colleagues in 1998. The aim of our study was to further characterise this model, specifically by measuring cytokines that have been implicated in inflammatory bowel disease (IBD) (IL-8 and IFN-gamma) in the colon/rectum of mdr1a(-/-) mice, and by determining the sensitivity of these, together with the macroscopic, microscopic and disease signs of colitis, to dexamethasone (0.05, 0.3 and 2 mg kg(-1) subcutaneously (s.c.) daily for 7 days). 2 All mdr1a(-/-) mice had microscopic evidence of inflammation in the caecum and colon/rectum, while control mice with the same genetic background did not. Significant increases in colon/rectum and caecal weights and also in cytokine levels (both IFN-gamma and IL-8) in homogenised colon/rectum were observed in mdr1a(-/-) mice compared to mdr1a(+/+) mice. 3 Dexamethasone reduced the increases in tissue weights and also microscopic grading of colitis severity, but had no effect on IFN-gamma or IL-8. 4 This study supports the similarity of the gastrointestinal inflammation present in mdr1a(-/-) mice to that of human IBD, in particular Crohn's disease. This has been demonstrated at the macroscopic and microscopic levels, and was supported further by elevations in colonic levels of IFN-gamma and IL-8 and the disease signs observed. The incidence of colitis was much higher than previously reported, with all mice having microscopic evidence of colitis. The limited variance between animals in the parameters measured suggests that this model is reproducible.
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Affiliation(s)
- Katharine H Banner
- Pfizer Global Research and Development, Discovery Biology, Sandwich, Kent, UK.
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25
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Foster AS, Gal AY, Gale JD, Lee YJ, Nieminen RM, Shluger AL. Interaction of silicon dangling bonds with insulating surfaces. Phys Rev Lett 2004; 92:036101. [PMID: 14753889 DOI: 10.1103/physrevlett.92.036101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2003] [Indexed: 05/24/2023]
Abstract
We use first principles density functional theory calculations to study the interaction of a model dangling bond silicon tip with the surfaces of CaF2, Al2O3, TiO2, and MgO. In each case the strongest interaction is with the highest anions in the surface. We show that this is due to the onset of chemical bonding with the surface anions, which can be controlled by an electric field across the system. Combining our results and previous studies on semiconductor surfaces suggests that using dangling bond Si tips can provide immediate identification of surface species in atomically resolved noncontact atomic force microscopy and facilitate selective measurements of short-range interactions with surface sites.
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Affiliation(s)
- A S Foster
- Laboratory of Physics, Helsinki University of Technology, P.O. Box 1100, 02015, Finland
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26
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Ogden MI, Rohl AL, Gale JD. An ab initio study of the influence of crystal packing on the host-guest interactions of calix[4]arene crystal structures. Chem Commun (Camb) 2001:1626-7. [PMID: 12240414 DOI: 10.1039/b104193m] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the first quantum mechanical calculations of p-tert-butylcalix[4]arene inclusion complexes in the crystalline state with geometrical aspects demonstrating good agreement with experiment, while comparison of the configurations calculated for an isolated complex and in the crystal, illustrate that crystal packing forces contribute to the observed structure of the host-guest assembly.
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Affiliation(s)
- M I Ogden
- School of Applied Chemistry, Curtin University of Technology, GPO Box U1987, Perth, 6845, Australia.
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27
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Abstract
We present a theoretical study of the formation of the first intermediate, dimethyl ether, in the methanol to gasoline conversion within the framework of an ab initio molecular dynamics approach. The study is performed under conditions that closely resemble the reaction conditions in the zeolite catalyst including the full topology of the framework. The use of the method of thermodynamic integration allows us to extract the free-energy profile along the reaction coordinate. We find that the entropic contribution qualitatively alters the free-energy profile relative to the total energy profile. Different transition states are found from the internal and free energy profiles. The entropy contribution varies significantly along the reaction coordinate and is responsible for stabilizing the products and for lowering the energy barrier. The hugely inhomogeneous variation of the entropy can be understood in terms of elementary processes that take place during the chemical reaction. Our simulations provide new insights into the complex nature of this chemical reaction.
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Affiliation(s)
- M Hytha
- National Center for High Performance Computing, Hsinchu, Taiwan
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Ferrari ES, Roberts KJ, Thomson GB, Gale JD, Catlow CR. Interatomic potential parameters for potassium tetrachlorozincate and their application to modelling its phase transformations. Acta Crystallogr A 2001; 57:264-71. [PMID: 11326111 DOI: 10.1107/s0108767300017955] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2000] [Accepted: 11/20/2000] [Indexed: 11/10/2022] Open
Abstract
An empirical fitting procedure is applied to derive interatomic potential parameters for a model phase transition system, namely potassium tetrachlorozincate (K(2)ZnCl(4)). The derived potential is found to reliably model the known crystallographic structure for the ferroelectric and paraelectric phases of this compound. Potential transferability is demonstrated by applying the parameters derived to the optimization of the known molecular structure for a similar inorganic system (rubidium tetrachlorozincate).
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Affiliation(s)
- E S Ferrari
- Centre for Molecular and Interface Engineering, Department of Mechanical and Chemical Engineering, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, Scotland
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29
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Gardner CJ, Armour DR, Beattie DT, Gale JD, Hawcock AB, Kilpatrick GJ, Twissell DJ, Ward P. GR205171: a novel antagonist with high affinity for the tachykinin NK1 receptor, and potent broad-spectrum anti-emetic activity. Regul Pept 1996; 65:45-53. [PMID: 8876035 DOI: 10.1016/0167-0115(96)00071-7] [Citation(s) in RCA: 110] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
It has been demonstrated recently that antagonists of the tachykinin NK1 receptor, specifically CP-99,994 and GR203040, possess anti-emetic activity in a range of species. To optimise this activity, a series of analogues based around the structure of GR203040 have been synthesised and their affinity at the human tachykinin NK1 receptor determined. In addition, the potency of these analogues to inhibit emesis induced in the ferret by whole-body X-irradiation has been examined. A range of substitution at the C-1 position of the tetrazole moiety in GR203040 were explored in vitro and in vivo. The trifluoromethyl compound, GR205171, was the most potent antagonist with regard to the ability to inhibit emesis induced by X-irradiation. This compound was demonstrated to have a broad spectrum of anti-emetic activity, inhibiting emesis in the ferret induced by cisplatin, cyclophosphamide, morphine, ipecacuanha and copper sulphate. Furthermore, emesis was also inhibited in the house-musk shrew, Suncus murinus, when induced by either motion or cisplatin, and in the dog when induced by ipecacuanha. GR205171 has the most potent anti-emetic activity of any tachykinin NK1 receptor antagonist described to date. The compound is orally active in the ferret and dog, long-lasting, and warrants further investigation as a potential broad-spectrum anti-emetic agent.
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Affiliation(s)
- C J Gardner
- Glaxo Wellcome Research and Development, Medicines Research Centre, Stevenage, UK
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Bountra C, Gale JD, Gardner CJ, Jordan CC, Kilpatrick GJ, Twissell DJ, Ward P. Towards understanding the aetiology and pathophysiology of the emetic reflex: novel approaches to antiemetic drugs. Oncology 1996; 53 Suppl 1:102-9. [PMID: 8692545 DOI: 10.1159/000227649] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [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: 02/01/2023]
Abstract
The introduction of 5-HT3 antagonists, such as ondansetron, as antiemetic agents has transformed the management of patients receiving chemotherapy or radiation therapy. Studies in animal models with NK1 antagonists suggest that these represent a new class of antiemetic agents having a broader spectrum of activity than 5-HT3 antagonists. Compounds of this class may prove to be more effective in man against delayed emesis induced by cisplatin, post-operative nausea and vomiting and motion sickness. Thus, they have the potential to complement 5-HT3 antagonists and so provide a further advance in the management of nausea and vomiting.
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Affiliation(s)
- C Bountra
- Division of Biology, Glaxo Research and Development Ltd., Ware, Herts., UK
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Abstract
Cisapride and metoclopramide are used clinically in the treatment of gastro-oesophageal reflux disease and also in a variety of motility disorders of the gastrointestinal tract. Their prokinetic effect is thought to be due to the augmentation of acetylcholine release from the myenteric plexus, an effect likely to be mediated through the stimulation of 5-HT4 receptors. The role of 5-HT4 receptors in the control of intestinal motility in man and animals is not clear, therefore we have investigated their role in the control of small intestinal transit in the rat. Radioactive microspheres were administered into the proximal duodenum of fasted conscious rats through an indwelling cannula. The extent of small intestinal transit was examined by determining the distribution of the microspheres within the intestine. Following i.p. injection small intestinal transit was inhibited (78%) by atropine (3 mg/kg), suggesting the presence of a basal cholinergic influence. Furthermore, in the presence of p-amino clonidine intestinal transit was stimulated (126%) by bethanechol (3 mg/kg). The 5-HT4 receptor agonists cisapride (1.0 mg/kg) and zacopride (1.0 mg/kg) failed to increase small intestinal transit. The 5-HT4 receptor selective antagonist GR125487 (1 mg/kg) was also without effect. These data suggest that 5-HT4 receptors are not involved in the control of small intestinal transit in the fasted conscious rat.
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Affiliation(s)
- N M Clayton
- Glaxo Research and Development Ltd, Ware, Herts, UK
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Gardner CJ, Twissell DJ, Dale TJ, Gale JD, Jordan CC, Kilpatrick GJ, Bountra C, Ward P. The broad-spectrum anti-emetic activity of the novel non-peptide tachykinin NK1 receptor antagonist GR203040. Br J Pharmacol 1995; 116:3158-63. [PMID: 8719790 PMCID: PMC1909155 DOI: 10.1111/j.1476-5381.1995.tb15118.x] [Citation(s) in RCA: 98] [Impact Index Per Article: 3.4] [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: 02/01/2023] Open
Abstract
1. Following our earlier observations that the tachykinin NK1 receptor antagonist CP-99,994 is an effective anti-emetic in ferrets, we have examined the anti-emetic effects of a more potent and novel NK1 receptor antagonist, GR203040, against various emetic stimuli in the ferret, dog and house musk shrew (Suncus murinus). 2. In ferrets, GR203040 (0.1 mg kg-1 s.c. or i.v.) is effective against emesis induced by radiation, cisplatin, cyclophosphamide, copper sulphate, ipecacuanha or morphine. 3. In animals in which emesis had been established with cisplatin, GR203040 (1 mg kg-1 s.c.) was fully effective as an interventional treatment. No further emesis was seen in animals treated with GR203040 whilst saline-treated animals continued to vomit. 4. GR203040 (0.1 mg kg-1 s.c.) retains anti-emetic efficacy in the ferret, even when given as a 6 h pretreatment, indicating that this compound has a long duration of action. The compound is also effective orally at the same dose, when given as a 90 min pretreatment. 5. GR203040 (0.1 mg kg-1 i.v.) is fully effective against ipecacuanha-induced emesis in the dog. 6. GR203040 is effective against motion- and cisplatin-induced emesis in Suncus murinus. These effects were seen at doses an order of magnitude greater than those shown to be effective against cisplatin in the ferret. 7. In conclusion, GR203040 is a novel anti-emetic agent, and the broad spectrum of anti-emetic activity, together with activity observed in three species, suggests that this compound is worthy of clinical investigation.
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Affiliation(s)
- C J Gardner
- Glaxo Research & Development Ltd., Glaxo Medicines Research Centre, Stevenage, Herts
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Abstract
In this brief review, we present the evidence for the regulation of the mesolimbic dopamine system by 5-HT3 and 5-HT4 receptors. A range of studies show good evidence that 5-HT3 receptor antagonists reduce raised mesolimbic dopamine activity by blocking 5-HT3 receptors in terminal parts of the mesolimbic dopamine system. Few studies have been conducted on the effects of 5-HT4 receptors on dopamine systems. However, it is clear that 5-HT4 receptors are present in relatively high density in areas of the brain that contain dopamine and preliminary studies show that 5-HT4 receptors may regulate the release of this transmitter.
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Affiliation(s)
- G J Kilpatrick
- Department of PRPN, Hoffman La Roche, Basel, Switzerland
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Abstract
In the latter part of the 20th century, significant advances have been made in the understanding of the emetic reflex. As a result, there have been major improvements in the treatment of vomiting, particularly that associated with chemo- and radiotherapeutic treatments for neoplastic disease. The 5-HT3 receptor antagonists (ondansetron and granisetron) have been demonstrated to be of benefit in treating the profound emesis observed during cancer treatment. This observation, together with results from pharmacologic and physiologic investigations in both animals and humans, have identified 5-hydroxy-tryptamine (5-HT or serotonin) to be of fundamental importance in the pathogenesis of emesis. 5-HT appears to be released by radiation and chemotherapeutic agents from enterochromaffin cells within the wall of the intestine, and possibly from neurons within the brainstem. Stimulation of 5-HT3 receptors, located centrally in the dorsal medulla of the brainstem and peripherally on vagal afferent terminals in the gastrointestinal tract, appears to play a pivotal role in eliciting emesis. The interaction of 5-HT with non-5-HT3 receptors, particularly 5-HT1A and 5-HT4 receptors, may be important in the emetic reflex. The development of agents that interact with these receptors may offer alternative approaches to the treatment of nausea and vomiting.
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Affiliation(s)
- J D Gale
- Department of Pharmacology, Glaxo Research and Development Ltd., Stevenage, England
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Abstract
1. The 5-HT4 receptor has only recently been identified but has yet to be cloned. This paper describes the pharmacology of a potent and selective 5-HT4 receptor antagonist, GR113808, which will be useful in the further characterization of this receptor. 2. On the guinea-pig ascending colon, GR113808 (1 nM-0.1 microM) behaved as an antagonist of 5-hydroxytryptamine (5-HT)-induced contraction, producing rightward displacements of the concentration-effect curve to 5-HT and a concentration-related depression of the maximum effect. However, the compound had no effect on cholecystokinin (CCK-8)-induced contraction in concentrations up to 1 microM. 3. In the guinea-pig colon preparation, onset and offset of the antagonism by GR113808 of 5-HT-induced contraction was examined. Incubation of the tissues for either 15 min, 30 min or 60 min produced similar rightward displacements of the concentration-effect curves to 5-HT, with no increase in the degree of depression of the maxima with increasing time of incubation. Experiments examining offset of antagonism (0.01 microM) demonstrated that washout for 30 min was required to reverse fully the effects of the antagonist. 4. Potency estimates in the colon for GR113808 were made by determining approximate pA2 values (30 min) using the Gaddum equation. The values obtained were 9.2, 9.7 and 9.2 when tested against the agonists 5-HT, 5-methoxytryptamine and R,S-zacopride respectively. 5. On the carbachol-contracted tunica muscularis mucosae preparation of the rat thoracic oesophagus, GR113808 behaved as an antagonist of 5-HT-induced relaxation, producing no reduction in maximum response. Analysis of these data yielded a pA2 of 9.3. GR1 13808 also antagonised the relaxant effects of 5-methoxytryptamine (pA2 = 9.0) and R,S-zacopride (pA2 = 9.4). The compound had no effect on isoprenaline-induced relaxation of the carbachol-contracted oesophagus at a concentration of 1 MicroM.6. In tests of selectivity, GR113808 had only low affinity for 5-HT3 receptors (pKi = 6.0) and had no functional activity at either 5-HT2 or 5-HT1-like receptors on vascular smooth muscle preparations. In a range of binding assays, GRi 13808 was shown to have no appreciable affinity for any other receptor type investigated.7. In the anaesthetized piglet, GRI13808 was a potent antagonist of 5-methoxytryptamine-induced tachycardia (mean DRo = 97.2 microg kg-1 h-1). The compound was ineffective against isoprenaline-induced tachycardia.8. The present results are discussed in comparison with those for existing antagonists at the 5-HT4receptor. The results of this study indicate that GRI13808 will be a valuable antagonist for studying 5-HT4 receptor mechanisms in vitro and in vivo and validate its use as a radioligand for determining 5-HT4 receptor distribution.
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Affiliation(s)
- J D Gale
- Department of Gastrointestinal Pharmacology, Glaxo Group Research Ltd., Ware, Hertfordshire
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Gale JD, Alberts JC, Cowen T. A quantitative study of changes in old age of 5-hydroxytryptamine-like immunoreactivity in perivascular nerves of the rabbit. J Auton Nerv Syst 1989; 28:51-60. [PMID: 2685087 DOI: 10.1016/0165-1838(89)90007-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Quantitative immunohistochemical techniques were applied to whole mount stretch preparations of the femoral, saphenous and cerebral blood vessels of rabbits from before birth to old age (greater than 3 years) in order to study the effects of ageing processes on 5-hydroxytryptamine(5-HT)-like immunoreactive perivascular nerve plexuses. Immunostained perivascular nerve fibres first appeared at 30 days in utero in all the vessels studied with the exception of the saphenous vein where nerves appeared at one day after birth. Perinatal and early postnatal development showed a general increase in nerve density in all the vessels, which continued up to adulthood (6 months) in all vessels except the femoral artery and then showed a general and often statistically significant decline in old age. Comparison of these results with those of noradrenergic perivascular innervation showed by 5-HT tended to appear later in perinatal development and was more widely reduced in old age than noradrenaline.
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Affiliation(s)
- J D Gale
- Department of Anatomy, Royal Free Hospital School of Medicine, London, U.K
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Abstract
5-Hydroxytryptamine-like immunoreactive nerve plexuses were demonstrated by indirect immunofluorescence histochemistry in whole-mount preparations and cryostat sections of blood vessels from the mesenteric vasculature of the adult rat. The major veins showed a density of innervation greater than that of the accompanying arteries. Removal of the coeliac-superior mesenteric ganglion complex resulted in almost total loss of 5-hydroxytryptamine-like immunoreactive nerves from superior mesenteric blood vessels. The results of crush lesions applied to distal vessels of the superior mesentery indicate that there were no 5-hydroxytryptamine-like immunoreactive nerve fibres extending from the enteric nervous system to these vessels. The administration of 6-hydroxydopamine resulted in a large reduction in the noradrenergic innervation, accompanied by a similar fall in the number of 5-hydroxytryptamine-like immunoreactive nerve fibres. It is suggested that the cell bodies of the 5-hydroxytryptamine-like immunoreactive nerve fibres demonstrated in the superior mesenteric vasculature are located within the sympathetic ganglia which supply the noradrenergic innervation to the same region and that the 5-hydroxytryptamine-like immunoreactivity may be co-localized with noradrenaline within sympathetic nerve fibres.
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Affiliation(s)
- J D Gale
- Department of Anatomy, Royal Free Hospital School of Medicine, London, U.K
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