Christopher T. Ritchlin

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The receptor activator of nuclear factor-kappaB ligand (RANKL), its cognate receptor RANK, and its natural decoy receptor osteoprotegerin have been identified as the final effector molecules of osteoclastic bone resorption. This has provided an ideal target for therapeutic interventions in metabolic bone disease. As described in previous reviews in this(More)
OBJECTIVE To develop comprehensive recommendations for the treatment of the various clinical manifestations of psoriatic arthritis (PsA) based on evidence obtained from a systematic review of the literature and from consensus opinion. METHODS Formal literature reviews of treatment for the most significant discrete clinical manifestations of PsA (skin and(More)
BACKGROUND Many patients with psoriasis develop psoriatic arthritis, a chronic inflammatory disease that afflicts peripheral synovial, axial, and entheseal structures. The fully human monoclonal antibody ustekinumab is an efficacious treatment for moderate-to-severe plaque psoriasis. We did a randomised, placebo-controlled, phase 3 trial to assess the(More)
BACKGROUND Therapeutic targets have been defined for diseases like diabetes, hypertension or rheumatoid arthritis and adhering to them has improved outcomes. Such targets are just emerging for spondyloarthritis (SpA). OBJECTIVE To define the treatment target for SpA including ankylosing spondylitis and psoriatic arthritis (PsA) and develop recommendations(More)
Psoriatic arthritis (PsA) is a chronic and erosive form of arthritis of unknown cause. We aimed to characterize the PsA phenotype using gene expression profiling and comparing it with healthy control subjects and patients rheumatoid arthritis (RA). Peripheral blood cells (PBCs) of 19 patients with active PsA and 19 age- and sex-matched control subjects were(More)
Conditioned media obtained from fibroblasts cultured from rheumatoid and certain other inflammatory synovia were observed to stimulate [3H]thymidine incorporation in an indicator murine fibroblast line. Synovial fibroblasts derived from the joints of patients with osteoarthritis did not display this property. This effect persisted in culture for many weeks(More)
There is mounting evidence indicating that the synovial fibroblast is a direct effector of tissue injury and matrix remodeling in inflammatory synovitis. Through the elaboration of effector signals including cytokines and chemokines, mesenchymal cells stimulate or suppress inflammation via autocrine and paracrine mechanisms. Synovial fibroblasts are the(More)
OBJECTIVE To evaluate the long-term effectiveness and tolerability of adalimumab in the treatment of psoriatic arthritis (PsA). METHODS Patients with PsA who completed a 24-week, double-blind study of adalimumab versus placebo were eligible to enroll in an open-label extension study and receive adalimumab 40 mg subcutaneously every other week for up to an(More)
OBJECTIVE Assess ustekinumab efficacy (week 24/week 52) and safety (week 16/week 24/week 60) in patients with active psoriatic arthritis (PsA) despite treatment with conventional and/or biological anti-tumour necrosis factor (TNF) agents. METHODS In this phase 3, multicentre, placebo-controlled trial, 312 adults with active PsA were randomised (stratified(More)
INTRODUCTION Psoriatic arthritis (PsA) is a chronic inflammatory arthritis characterized by bone erosion mediated by osteoclasts (OC). Our previous studies showed an elevated frequency of OC precursors (OCP) in PsA patients. Here, we examined if OC arise from CD16-positive monocytes in PsA. METHODS Peripheral blood mononuclear cells (PBMC) or monocytes(More)