The Role Of Neutrophil Proteases As Global Regulators Of Il-1 Family Cytokine Activity In Skin Disorders

Summary

Participation Requirements

Description

Neutrophils, the 'first responder' cells of the immune system are recruited rapidly to sites of infection or inflammation. Neutrophil granule proteases, cathepsin G, elastase and proteinase-3, are thought to function as anti-microbial effectors, cooperatively working to kill microorganisms during in...

Neutrophils, the 'first responder' cells of the immune system are recruited rapidly to sites of infection or inflammation. Neutrophil granule proteases, cathepsin G, elastase and proteinase-3, are thought to function as anti-microbial effectors, cooperatively working to kill microorganisms during infection. However, evidence also suggests that these enzymes play an important role in the coordination and escalation of inflammatory reactions, but how this is achieved has remained obscure. IL-1 family cytokines are important initiators of inflammation but require processing by enzymes for activation. The IL-1 cytokine family is made up of 11 members, but this study will focus on the processing and activation of 7 of these pro-inflammatory cytokines (IL-1a, IL-1b, IL-18, IL-33, IL-36a, IL-36b and IL-36g). Members of the extended IL-1 family are found at high levels in barrier surfaces such as the skin, and thought to play a role in conditions such as psoriasis, atopic dermatitis/eczema and ichthyosis. Psoriasis particularly is associated with massive neutrophil influx. This study aims to investigate the physiological relevance of neutrophil proteases in the activation of IL-1 family cytokines in skin disorders. The investigators plan to study the contribution of neutrophil proteases to inflammation in normal skin versus lesions from areas of skin affected by the conditions described above. The investigators are interested in measuring the levels of active neutrophil proteases in normal healthy skin versus skin lesions from affected sites compared to non-lesional, unaffected skin. The investigators also are interested to see if levels of neutrophil proteases found in lesions from affected skin sites are able to process and activate IL-1 family cytokines and contribute to inflammation in this way. The investigators plan to include up to 80 participants; 20 healthy volunteers, 20 participants who will have a diagnosis of psoriasis, 20 participants who have a diagnosis of atopic dermatitis and 20 patients who have a diagnosis of ichthyosis with active lesions on their arms. Skin samples from normal versus lesional and non-lesional, unaffected skin will be taken by tape stripping method.

Tracking Information