Interleukin-2 (IL-2) is a medication being studied for its potential to help manage chronic inflammatory diseases. In this trial, it is used in low doses to see if it can safely increase the number of regulatory T cells (Tregs) in the body. These Tregs are important because they help control the immune system and reduce inflammation. The trial is looking at how well this medication works in people with conditions like Pemphigus vulgaris, Mucous Membrane Pemphigoid, Polymyositis, Dermatomyositis, and Primary Sclerosing Cholangitis.

Mucous Membrane Pemphigoid – This is a chronic autoimmune disorder characterized by blistering lesions primarily affecting the mucous membranes, such as the mouth, eyes, and throat. The disease progresses with the formation of blisters that can lead to scarring, particularly in the eyes, potentially causing vision problems. The blisters are caused by the immune system mistakenly attacking the tissue that connects the outer layer of skin to the underlying layer.

Primary Sclerosing Cholangitis – This is a chronic liver disease characterized by inflammation and scarring of the bile ducts, which can lead to liver damage over time. The disease progresses as the bile ducts become narrowed and blocked, causing bile to accumulate in the liver, leading to liver cell damage. Symptoms may include fatigue, itching, and jaundice, but some individuals may remain asymptomatic for years.

Pemphigus Vulgaris – This is an autoimmune disorder that causes painful blisters and erosions on the skin and mucous membranes. The disease progresses as the immune system attacks the proteins that hold skin cells together, leading to the separation of skin layers and blister formation. Blisters can occur anywhere on the body but are most common in the mouth and on the skin.

Pemphigus Foliaceus – This is a milder form of pemphigus that primarily affects the skin, causing superficial blisters and crusty sores. The disease progresses as the immune system attacks the outermost layer of skin, leading to blistering and scaling. Unlike pemphigus vulgaris, it rarely affects the mucous membranes.

Polymyositis – This is an inflammatory muscle disease that causes muscle weakness, primarily affecting the muscles closest to the trunk of the body. The disease progresses with increasing muscle weakness, which can lead to difficulty in performing everyday activities such as climbing stairs or lifting objects. It is believed to be an autoimmune condition where the immune system attacks muscle tissue.

Dermatomyositis – This is an inflammatory disease marked by muscle weakness and a distinctive skin rash. The disease progresses with muscle weakness similar to polymyositis, but it also includes a rash that can appear on the face, knuckles, and other areas. The rash is often the first sign of the disease and can be accompanied by muscle pain and fatigue.