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Rheumatoid arthritis (RA) is a systemic autoimmune disease characterized by chronic inflammation of the joints and bone destruction. Because of systemic administration and poor targeting, traditional anti-rheumatic drugs have unsatisfactory treatment efficacy and strong side effects, including myelosuppression, liver or kidney function damage, and malignant tumors. Consequently, mesenchymal stem cells (MSCs)-involved therapy is proposed for RA therapy as a benefit of their immunosuppressive and tissue-repairing effects. This review summarizes the progress of MSCs-involved RA therapy through suppressing inflammation and promoting tissue regeneration and predicts their potential clinical application.

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BACKGROUND: Rheumatoid arthritis (RA) has unclear pathogenesis, but the molecules that feed its inflammatory state are known. Small interfering RNAs (siRNAs) are useful to identify molecular targets and evaluate the efficacy of specific drugs, and can themselves be used for therapeutic purposes. SOURCES OF DATA: A systematic search of different databases to March 2022 was performed to define the role of siRNAs in RA therapy. Twenty suitable studies were identified. AREAS OF AGREEMENT: Small interfering RNAs can be useful in the study of inflammatory processes in RA, and identify possible therapeutic targets and drug therapies. AREAS OF CONTROVERSY: Many genes and cytokines participate in the inflammatory process of RA and can be regulated with siRNA. However, it is difficult to determine whether the responses to siRNAs and other drugs studied in human cells in vitro are similar to the responses in vivo. GROWING POINTS: Inflammatory processes can be affected by the gene dysregulation of siRNAs on inflammatory cytokines. AREAS TIMELY FOR DEVELOPING RESEARCH: To date, it is not possible to determine whether the pharmacological response of siRNAs on cells in vitro would be similar to what takes place in vivo for the diseases studied so far.

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OBJECTIVE: This study was aimed to analyze the prescription pattern of disease modifying anti-rheumatic drug (DMARD) therapy in patients with rheumatoid arthritis (RA) in a tertiary care teaching hospital in Uttarakhand, India. METHODOLOGY: This cross-sectional study was conducted in 150 RA patients who were given DMARD therapy. Patient's demographic details, drugs prescribed with their dosage and administration routes and the usage of complementary and alternative medicine (CAM) therapy were recorded to study the prescription pattern. RESULTS: Overall, 4 DMARDs were prescribed in all the studied patients: Methotrexate (n = 150), hydroxychloroquine (n = 35), leflunomide (n = 5), and adalimumab (n = 1). Single DMARD therapy with methotrexate was prescribed to 110 (73.3%) followed by double therapy with methotrexate + hydroxychloroquine in 35 (23.3%), triple therapy (methotrexate + hydroxychloroquine + leflunomide) in 4 (2.7%) and triple therapy with biological DMARD (methotrexate + hydroxychloroquine + leflunomide + adalimumab) in 1 (0.7%) patient. Adjuvant therapy drugs included: Prednisolone (n = 150), folic acid (n = 150), naproxen (n = 150), calcium (n = 150), vitamin D (n = 150) and indomethacin (n = 40). Of the total, 61.4% patients also took complimentary alternative medicine (CAM) therapy. CONCLUSION: Our study concludes that the most commonly prescribed DMARDs in our setting, to patients of RA, in descending order of frequency were methotrexate, followed by hydroxychloroquine, leflunomide and lastly adalimumab. A total of five adjuvant medications were commonly prescribed to all patients. There was a high prevalence of self-medicated CAM therapy in the majority of these patients.

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Rheumatoid arthritis (RA) induces the destruction of cartilage and bone. Methotrexate (MTX) functions as an effective first-line drug to relieve RA in the clinic. However, patients treated with MTX often suffer from severe side effects mainly due to its off-target effects. Therefore, selective delivery of MTX to the affected joints may achieve upregulated efficacy and safety. The affected joints of RA feature hypoxic microenvironment and increased level of glutathione (GSH), resulting from synovial proliferation, lymphocyte infiltration, and neovascularization. In this study, a disulfide-cross-linked nanogel (NG) of methoxy poly(ethylene glycol)-poly(L-phenylalanine-co-L-cystine) (mPEG-P(LP-co-LC)) was synthesized as an intracellular delivery system of MTX. The loading nanogel NG/MTX exhibited apparent reduction-responsiveness and GSH-triggered release behavior of MTX. It also showed efficient internalization and high cytotoxicity toward activated macrophages. Moreover, NG/MTX possessed selective biodistribution in the inflammatory joints of collagen-induced arthritis mouse model. The clinical and histological scores of the mice after NG/MTX treatment were lower than those of the other groups, and the progress of collagen-induced arthritis was overall relieved. To conclude, the controlled delivery of MTX by smart polymer nanoparticles to the RA-affected joints may be a promising approach in the clinical therapy of RA.

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Rheumatoid arthritis (RA) is a chronic autoimmune disorder implicated in multiple joint affection and even disability. The activated macrophages perform a predominant role in onset and persistence of RA. Scavenger receptor (SR), one of several receptors overexpressed on the activated macrophages, is a specific biomarker for targeted therapy of numerous chronic inflammation diseases like RA. In this work, dextran sulfate-graft-methotrexate conjugate (DS-g-MTX) is synthesized and characterized, which exhibits excellent targetability to SR on the activated RAW 264.7 cells. Additionally, the enhanced accumulation and potent inflammatory inhibition are observed in the affected joint after intravenous injection of DS-g-MTX, compared to the treatment with dextran-graft-methotrexate (Dex-g-MTX), as is confirmed by the detection of histopathology and pro-inflammatory cytokines. Our work highlights DS-g-MTX as a potential therapeutic option for RA aiming the SR-expressed activated macrophages.

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A question is raised about an increased risk of severe infection from the use of biological drugs in patients with rheumatoid arthritis. This systematic review of observational studies aimed at assessing the risk of severe infection associated with the use of anakinra, rituximab, and abatacept in patients with rheumatoid arthritis. The following databases were searched: PubMed, Science Direct, Scopus, Web of Knowledge, Scirus, Cochrane, Exerpta Medica Database, Scielo, and Lilacs up to July 2010. Severe infections were defined as those life-threatening ones in need of the use of parenteral antibiotics or of hospitalization. Longitudinal observational studies were selected without language restriction, involving adult patients diagnosed with rheumatoid arthritis and who used anakinra, rituximab, or abatacept. In four studies related to anakinra, 129 (5.1%) severe infections were related in 2896 patients, of which three died. With respect to rituximab, two studies reported 72 (5.9%) severe infections in 1224 patients, of which two died. Abatacept was evaluated in only one study in which 25 (2.4%) severe infections were reported in 1046 patients. The main site of infection for these three drugs was the respiratory tract. One possible explanation for the high frequency of severe infections associated with anakinra may be the longer follow-up time in the selected studies. The high frequency of severe infections associated with rituximab could be credited to the less strict inclusion criteria for the patients studied. Therefore, infection monitoring should be cautious in patients with rheumatoid arthritis in use of these three drugs.

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ABSTRACT A question is raised about an increased risk of severe infection from the use of biological drugs in patients with rheumatoid arthritis. This systematic review of observational studies aimed at assessing the risk of severe infection associated with the use of anakinra, rituximab, and abatacept in patients with rheumatoid arthritis. The following databases were searched: PubMed, Science Direct, Scopus, Web of Knowledge, Scirus, Cochrane, Exerpta Medica Database, Scielo, and Lilacs up to July 2010. Severe infections were defined as those life-threatening ones in need of the use of parenteral antibiotics or of hospitalization. Longitudinal observational studies were selected without language restriction, involving adult patients diagnosed with rheumatoid arthritis and who used anakinra, rituximab, or abatacept. In four studies related to anakinra, 129 (5.1%) severe infections were related in 2896 patients, of which three died. With respect to rituximab, two studies reported 72 (5.9%) severe infections in 1224 patients, of which two died. Abatacept was evaluated in only one study in which 25 (2.4%) severe infections were reported in 1046 patients. The main site of infection for these three drugs was the respiratory tract. One possible explanation for the high frequency of severe infections associated with anakinra may be the longer follow-up time in the selected studies. The high frequency of severe infections associated with rituximab could be credited to the less strict inclusion criteria for the patients studied. Therefore, infection monitoring should be cautious in patients with rheumatoid arthritis in use of these three drugs.

RESUMO Existe um questionamento sobre aumento do risco de infecções graves pelo uso de medicamentos biológicos por pacientes com artrite reumatoide. Esta revisão sistemática de estudos observacionais objetivou avaliar o risco de infecções graves associadas ao uso de anakinra, rituximab e abatacept em pacientes com artrite reumatoide. Foram pesquisadas as bases PubMed, Science Direct, Scopus, Web of Knowledge, Scirus, Cochrane, Exerpta Medica Database, Scielo e Lilacs até julho/2010. Infecções graves foram definidas como aquelas com de risco de vida, necessidade de antibióticos parenterais ou de hospitalização. Foram selecionados estudos observacionais longitudinais, sem restrição de idioma, que envolviam pacientes adultos com diagnóstico de artrite reumatoide que usaram anakinra, rituximab, abatacept. Em quatro estudos relacionados ao anakinra, foram relatadas 129 (5,1%) infecções graves em 2.896 pacientes, dos quais três evoluíram para óbito. Sobre o rituximab, dois estudos relataram 72 (5,9%) infecções graves em 1.224 pacientes, dos quais dois evoluíram para óbito. O abatacept foi avaliado em apenas um estudo, no qual foram relatadas 25 (2,4%) infecções graves em 1.046 pacientes. O principal sítio de infecção para os três medicamentos foi o trato respiratório. Uma possível explicação para a frequência elevada de infecções graves associadas ao anakinra pode ser o maior tempo de acompanhamento nos estudos selecionados. A frequência elevada de infecções graves associadas ao rituximab poderia ser creditada ao critério menos restrito de inclusão de pacientes. Portanto, deve ser cautelosa a monitoração de infecções nos pacientes com artrite reumatoide que usam esses três medicamentos.

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A new anti-tumor necrosis factor alpha (TNF-α) inhibitor with a novel mechanism of action has entered phase 3 trials in rheumatoid arthritis (RA). Certolizumab pegol (Cimzia(®)) is a humanized Fab' antibody fragment against TNF-α with a polyethylene glycol tail that prevents complement-dependent and antibody-dependent cell-mediated cytotoxicity or apoptosis. Four randomized clinical trials have been published so far. Reported results are similar to those published in previous studies with other TNF-α inhibitors, with ACR20, ACR50, and ACR70 responses of around 60%, 40%, and 20%, respectively, when combined with methotrexate and slightly lower when used as monotherapy. Safety was shown to be similar to that seen with TNF-α blockers and some cases of tuberculosis were seen in the trials, stressing the importance of a complete screening in these patients. Although we still need effectiveness and safety data in larger numbers of patients and longer follow-up, this new TNF inhibitor is a welcome addition to our current armamentarium for the treatment of RA.