Increase of Circulating Monocyte-Platelet Conjugates in Rheumatoid Arthritis Responders to IL-6 Blockage.

Platelets (PLT) bind to a significant percentage of circulating monocytes and this immunomodulatory interaction is increased in several inflammatory and autoimmune conditions. The therapeutic blockage of IL-6 with Tocilizumab (TCZ) alters PLT and the phenotype and function of monocytes in rheumatoid arthritis (RA). However, the relationship between monocyte−PLT conjugates (CD14+PLT+) and clinical and immunological variables and the regulation of this interaction by IL-6 blockage are still unknown. Here, we compared the presence of monocyte−PLT conjugates (CD14+PLT+) and membrane CD162 expression using flow cytometry, and, by ELISA, the markers of PLT activation (sCD62P and sCD40L) in healthy donors (HD) and patients with long-standing RA before TCZ (baseline). We found higher percentages and absolute counts of CD14+PLT+, and higher plasmatic levels of sCD62P and sCD40L but lower CD162 expression on monocytes from RA patients than those from HD. Additionally, the levels of CD14+PLT+ inversely correlated with inflammatory parameters. Interestingly, 95% of patients with lower percentages of CD14+PLT+ and only 63% of patients with higher percentages of CD14+PLT+ achieved a EULAR-defined response at four weeks (p = 0.036). After TCZ, the percentage of CD14+PLT+ increased in 92% of RA patients who achieved 12 w-remission (p < 0.001). Our results suggest that the binding of PLTs has a modulatory effect, accentuated by the increased binding of PLTs to monocytes in response to the therapeutic blockage of IL-6.

Estudio VARIAR: valoración de la eficacia y seguridad a corto plazo en artritis reumatoide del uso de RItuximab comparado con Antagonistas del factor de necrosis tumoral alfa en segunda línea terapéutica en pacientes con artritis reumatoide Refractarios a un primer antagonista del factor de necrosis tumoral alfa / VARIAR Study: assessment of short-term efficacy and safety of rituximab compared to an tumor necrosis factor alpha antagonists as second-line drug therapy in patients with rheumatoid arthritis refractory to a first tumor necrosis factor alpha antagonist

Objetivo. Evaluar la eficacia y la seguridad a corto plazo del tratamiento de pacientes con artritis reumatoide (AR) con rituximab (RTX) comparado con un anti-TNF (2TNF) tras retirada de un primer anti-TNF. Métodos. Estudio multicéntrico prospectivo, observacional, de práctica clínica de pacientes con AR grave refractaria a anti-TNF que recibieron RTX comparados con los que recibieron un 2TNF. Comparación de las variables de eficacia y respuesta EULAR buena/moderada a los 6 meses. Resultados. Ciento tres pacientes incluidos; 82 alcanzan seguimiento a 6 meses, 73,7% mujeres. Datos basales grupo RTX y 2TNF, respectivamente: 8,6 y 6,6 NAD, 8,8 y 7,5 NAI, 5,45 ± 1,28 y 5,18 ± 1,21 en DAS28 (p=0,048), 41 y 38,7mmHg de VSG, y 1,2 y 1,0 en HAQ. Mejoría en todos los parámetros en ambos grupos sin diferencias significativas (excepto mayor reducción de VSG con RTX). Ausencia de efectos adversos graves. Conclusiones. El uso de RTX en segunda línea de terapia biológica tras fallo a un primer anti-TNF en práctica clínica muestra mejoría en las variables de eficacia y funcionalidad a los 6 meses, sin presentar efectos adversos graves. Estos resultados no difieren de los observados tras el uso de un segundo anti-TNF en el mismo escenario clínico (AU)

Objective. to compare the short-term efficacy and safety of rituximab (RTX) therapy versus anti-TNF in rheumatoid arthritis (RA) patients after discontinuation of a first anti-TNF agent. Methods. prospective observational multicenter study in the clinical practice setting, involving patients with severe RA refractory to a first anti-TNF agent, who received either RTX or a second anti-TNF (2TNF), comparing the efficacy endpoints, EULAR response (Good/Moderate) and safety at 6 months. Results. 103 patients enrolled, 82 completed 6-month follow-up, 73.7% women. Baseline data for RTX and 2TNF groups, respectively: TJC, 8.6 and 6.6; SJC, 8.8 and 7.5; DAS28 score, 5.45 (±1.28) and 5.18 (±1.21) (p=0.048), ESR, 41 and 38.7mmHg; and HAQ, 1.2 and 1.0. Improvement was observed in all parameters, with no significant differences (except for a more marked reduction in ESR with RTX). There were no serious adverse events. Conclusions. RTX use as second-line therapy after anti-TNF failure led to improvements in the efficacy and functional variables at 6 months, with no serious adverse events. These results were comparable to those observed in patients who used a second anti-TNF agent in the same clinical scenario (AU)