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      Fresolimumab treatment decreases biomarkers and improves clinical symptoms in systemic sclerosis patients

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          Abstract

          TGF-β has potent profibrotic activity in vitro and has long been implicated in systemic sclerosis (SSc), as expression of TGF-β-regulated genes is increased in the skin and lungs of patients with SSc. Therefore, inhibition of TGF-β may benefit these patients.

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          NADPH Oxidase-4 Mediates Myofibroblast Activation and Fibrogenic Responses to Lung Injury

          Louise Hecker, Ragini Vittal, Tamara Jones … (2009)
          The NADPH oxidase (NOX) family of enzymes, which catalyze the reduction of O2 to form reactive oxygen species (ROS), have increased in number during eukaryotic evolution1,2. Seven isoforms of the NOX gene family have been identified in mammals; however, specific roles of NOX enzymes in mammalian physiology and pathophysiology have not been fully elucidated3,4. The best established physiological role of NOX enzymes is in host defense against pathogen invasion in diverse species, including plants5,6. The prototypical member of this family, NOX2 (gp91 phox ), is expressed in phagocytic cells and mediates microbicidal activities7,8. Here, we report a role for the NOX4 isoform in tissue repair functions of myofibroblasts and fibrogenesis. Transforming growth factor-β1 (TGF-β1) induces NOX4 expression in lung mesenchymal cells by a SMAD3-dependent mechanism. NOX4-dependent generation of hydrogen peroxide (H2O2) is required for TGF-β1-induced myofibroblast differentiation, extracellular matrix (ECM) production, and contractility. NOX4 is upregulated in lungs of mice subjected to non-infectious injury and in human idiopathic pulmonary fibrosis (IPF). Genetic or pharmacologic targeting of NOX4 abrogates fibrogenesis in two different murine models of lung injury. These studies support a novel function for NOX4 in tissue fibrogenesis and provide proof-of-concept for therapeutic targeting of NOX4 in recalcitrant fibrotic disorders.
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            Phase I Study of GC1008 (Fresolimumab): A Human Anti-Transforming Growth Factor-Beta (TGFβ) Monoclonal Antibody in Patients with Advanced Malignant Melanoma or Renal Cell Carcinoma

            John C. Morris, Antoinette Tan, Thomas Olencki … (2014)
            Background In advanced cancers, transforming growth factor-beta (TGFβ) promotes tumor growth and metastases and suppresses host antitumor immunity. GC1008 is a human anti-TGFβ monoclonal antibody that neutralizes all isoforms of TGFβ. Here, the safety and activity of GC1008 was evaluated in patients with advanced malignant melanoma and renal cell carcinoma. Methods In this multi-center phase I trial, cohorts of patients with previously treated malignant melanoma or renal cell carcinoma received intravenous GC1008 at 0.1, 0.3, 1, 3, 10, or 15 mg/kg on days 0, 28, 42, and 56. Patients achieving at least stable disease were eligible to receive Extended Treatment consisting of 4 doses of GC1008 every 2 weeks for up to 2 additional courses. Pharmacokinetic and exploratory biomarker assessments were performed. Results Twenty-nine patients, 28 with malignant melanoma and 1 with renal cell carcinoma, were enrolled and treated, 22 in the dose-escalation part and 7 in a safety cohort expansion. No dose-limiting toxicity was observed, and the maximum dose, 15 mg/kg, was determined to be safe. The development of reversible cutaneous keratoacanthomas/squamous-cell carcinomas (4 patients) and hyperkeratosis was the major adverse event observed. One malignant melanoma patient achieved a partial response, and six had stable disease with a median progression-free survival of 24 weeks for these 7 patients (range, 16.4–44.4 weeks). Conclusions GC1008 had no dose-limiting toxicity up to 15 mg/kg. In patients with advanced malignant melanoma and renal cell carcinoma, multiple doses of GC1008 demonstrated acceptable safety and preliminary evidence of antitumor activity, warranting further studies of single agent and combination treatments. Trial Registration Clinicaltrials.gov NCT00356460
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              A phase 1, single-dose study of fresolimumab, an anti-TGF-β antibody, in treatment-resistant primary focal segmental glomerulosclerosis

              Howard Trachtman, Fernando Fervenza, Debbie S. Gipson … (2011)
              Primary focal segmental glomerulosclerosis (FSGS) is a disease with poor prognosis and high unmet therapeutic need. Here, we evaluated the safety and pharmacokinetics of single-dose infusions of fresolimumab, a human monoclonal antibody that inactivates all forms of transforming growth factor-β (TGF-β), in a phase I open-label, dose-ranging study. Patients with biopsy-confirmed, treatment-resistant, primary FSGS with a minimum estimated glomerular filtration rate (eGFR) of 25 ml/min per 1.73 m2, and a urine protein to creatinine ratio over 1.8 mg/mg were eligible. All 16 patients completed the study in which each received one of four single-dose levels of fresolimumab (up to 4 mg/kg) and was followed for 112 days. Fresolimumab was well tolerated with pustular rash the only adverse event in two patients. One patient was diagnosed with a histologically confirmed primitive neuroectodermal tumor 2 years after fresolimumab treatment. Consistent with treatment-resistant FSGS, there was a slight decline in eGFR (median decline baseline to final of 5.85 ml/min per 1.73 m2). Proteinuria fluctuated during the study with the median decline from baseline to final in urine protein to creatinine ratio of 1.2 mg/mg with all three Black patients having a mean decline of 3.6 mg/mg. The half-life of fresolimumab was ∼14 days, and the mean dose-normalized Cmax and area under the curve were independent of dose. Thus, single-dose fresolimumab was well tolerated in patients with primary resistant FSGS. Additional evaluation in a larger dose-ranging study is necessary.
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                Author and article information

                Journal
                Title: Journal of Clinical Investigation
                Abbreviated Title: J. Clin. Invest.
                Publisher: American Society for Clinical Investigation
                ISSN (Print): 0021-9738
                Publication date Created: July 1 2015
                Publication date (Electronic): June 22 2015
                Publication date (Print): July 1 2015
                Volume: 125
                Issue: 7
                Pages: 2795-2807
                Article
                DOI: 10.1172/JCI77958
                PubMed ID: 26098215
                SO-VID: 4237c5c3-66ae-4018-9a7e-9c6951638105
                Copyright © © 2015
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