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Open Access Research article

Preclinical characterization of DEKAVIL (F8-IL10), a novel clinical-stage immunocytokine which inhibits the progression of collagen-induced arthritis

Kathrin Schwager1, Manuela Kaspar1, Frank Bootz12, Roberto Marcolongo3, Erberto Paresce4, Dario Neri2* and Eveline Trachsel1

Author Affiliations

1 Philochem AG, c/o ETH Zurich, Institute of Pharmaceutical Sciences, Wolfgang-Pauli-Strasse 10 HCI E520, CH-8093 Zurich, Switzerland

2 Institute of Pharmaceutical Sciences, ETH Zürich, Wolfgang-Pauli-Strasse 10, CH-8093 Zurich, Switzerland

3 Centro Interdipartimentale Studio Biochimico-Clinico Patologie Osteoarticolari, Via Doninzetti 7, University of Siena, 53100 Siena, Italy

4 Department of Rheumatology, Instituto Ortopedico Gaetano Pini, via Pini 9, 20122 Milan, Italy

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Arthritis Research & Therapy 2009, 11:R142  doi:10.1186/ar2814


See related editorial by van de Loo and van den Berg, http://arthritis-research.com/content/11/6/132

Published: 25 September 2009

Abstract

Introduction

In this article, we present a comparative immunohistochemical evaluation of four clinical-stage antibodies (L19, F16, G11 and F8) directed against splice isoforms of fibronectin and of tenascin-C for their ability to stain synovial tissue alterations in rheumatoid arthritis patients. Furthermore we have evaluated the therapeutic potential of the most promising antibody, F8, fused to the anti-inflammatory cytokine interleukin (IL) 10.

Methods

F8-IL10 was produced and purified to homogeneity in CHO cells and shown to comprise biological active antibody and cytokine moieties by binding assays on recombinant antigen and by MC/9 cell proliferation assays. We have also characterized the ability of F8-IL10 to inhibit arthritis progression in the collagen-induced arthritis mouse model.

Results

The human antibody F8, specific to the extra-domain A of fibronectin, exhibited the strongest and most homogenous staining pattern in synovial biopsies and was thus selected for the development of a fully human fusion protein with IL10 (F8-IL10, also named DEKAVIL). Following radioiodination, F8-IL10 was able to selectively target arthritic lesions and tumor neo-vascular structures in mice, as evidenced by autoradiographic analysis and quantitative biodistribution studies. The subcutaneous administration route led to equivalent targeting results when compared with intravenous administration and was thus selected for the clinical development of the product. F8-IL10 potently inhibited progression of established arthritis in the collagen-induced mouse model when tested alone and in combination with methotrexate. In preparation for clinical trials in patients with rheumatoid arthritis, F8-IL10 was studied in rodents and in cynomolgus monkeys, revealing an excellent safety profile at doses tenfold higher than the planned starting dose for clinical phase I trials.

Conclusions

Following the encouraging preclinical results presented in this paper, clinical trials with F8-IL10 will now elucidate the therapeutic potential of this product and whether the targeted delivery of IL10 potentiates the anti-arthritic action of the cytokine in rheumatoid arthritis patients.