Effect of statins as modulators of CD39+ tregs in patients with rheumatoid arthritis who were unsuccessfully treated with methotrexate

Hydroxychloroquine non-availability during COVID-19 pandemic and its relation to anxiety level and disease activity in rheumatoid arthritis and lupus patients: a cross-sectional study

Background

During COVID-19 disease era, there is an accelerated demand for hydroxychloroquine since it was suggested by some centers as potential therapy for COVID-19 which has led to diminished supplies for patients with rheumatic disease and which carried unexpected risk for disease flare particularly in patients with systemic lupus erythematosus and rheumatoid arthritis. The purpose of the work is to detect the effect of HCQ shortage in patients with RA and SLE on anxiety and disease activity.

Results

A total of 320 patients were divided into two groups: group 1—216RA patients with mean age 45.5 ± 9.59 years, disease duration 43.4 ± 25.6 months with female predominance (62.5%). Group 2—104 SLE patients with mean33.4 ± 7.9 age years, disease duration 52.1 ± 34.6 months with female predominance (85.6%). HCQ shortage occurred in 174 RA patients (80.5%) and 76 lupus patients (73.1%). Despite HCQ shortage, there were no significant change in disease activity of RA (using CDAI) and SLE (using SELENA) p = 0.063 and 0.064 respectively before and after HCQ shortage. Anxiety level was higher in patients who were exposed to HCQ shortage in both groups (SLE p 0.0058 and RA p 0.0044) when we compared them to those without HCQ shortage.

Conclusion

In most patients with RA and SLE, the COVID-19 pandemic resulted in a HCQ scarcity, with no effect on disease activity. Anxiety was found to be associated with HCQ shortage in both diseases.

Conversion of extracellular ATP into adenosine: a master switch in renal health and disease

ATP and its ultimate degradation product adenosine are potent extracellular signalling molecules that elicit a variety of pathophysiological functions in the kidney through the activation of P2 and P1 purinergic receptors, respectively. Extracellular purines can modulate immune responses, balancing inflammatory processes and immunosuppression; indeed, alterations in extracellular nucleotide and adenosine signalling determine outcomes of inflammation and healing processes. The functional activities of ectonucleotidases such as CD39 and CD73, which hydrolyse pro-inflammatory ATP to generate immunosuppressive adenosine, are therefore pivotal in acute inflammation. Protracted inflammation may result in aberrant adenosinergic signalling, which serves to sustain inflammasome activation and worsen fibrotic reactions. Alterations in the expression of ectonucleotidases on various immune cells, such as regulatory T cells and macrophages, as well as components of the renal vasculature, control purinergic receptor-mediated effects on target tissues within the kidney. The role of CD39 as a rheostat that can have an impact on purinergic signalling in both acute and chronic inflammation is increasingly supported by the literature, as detailed in this Review. Better understanding of these purinergic processes and development of novel drugs targeting these pathways could lead to effective therapies for the management of acute and chronic kidney disease.