Evaluating chronic urticaria patients for allergies, infections, or autoimmune disorders

Efficacy of the colchicine add-on therapy in patients with autoimmune chronic urticaria

Chronic urticaria is in some cases very difficult to treat, we aimed to evaluate the effect of colchicine on chronic urticaria management. Fifty-five euthyroid patients with chronic urticaria were examined based on UQL and UAS7 questionnaires. The overall UQL-Q score after 3 months has not any statistical difference between groups. The overall UQL-Q score changes between groups was not statistically different. However, the UQL-Q score significantly reduces during study period in each group. In conclusion, colchicine can manage the sign and symptoms of chronic urticaria, which improve the patients' quality of life.

Mast cell and autoimmune diseases

Mast cells are important in innate immune system. They have been appreciated as potent contributors to allergic reaction. However, increasing evidence implicates the important role of mast cells in autoimmune disease like rheumatoid arthritis and multiple sclerosis. Here we review the current stage of knowledge about mast cells in autoimmune diseases.

Chronic urticaria

Chronic urticaria (CU) is a disturbing allergic condition of the skin. Although frequently benign, it may sometimes be a red flag sign of a serious internal disease. A multitude of etiologies have been implicated in the causation of CU, including physical, infective, vasculitic, psychological and idiopathic. An autoimmune basis of most of the 'idiopathic' forms is now hypothesized. Histamine released from mast cells is the major effector in pathogenesis and it is clinically characterized by wheals that have a tendency to recur. Laboratory investigations aimed at a specific etiology are not always conclusive, though may be suggestive of an underlying condition. A clinical search for associated systemic disease is strongly advocated under appropriate circumstances. The mainstay of treatment remains H1 antihistaminics. These may be combined with complementary pharmacopeia in the form of H2 blockers, doxepin, nifedipine and leukotriene inhibitors. More radical therapy in the form of immunoglobulins, plasmapheresis and cyclophosphamide may be required for recalcitrant cases. Autologous transfusion and alternative remedies like acupuncture have prospects for future. A stepwise management results in favorable outcomes. An update on CU based on our experience with patients at a tertiary care centre is presented.

Prospects for vaccines for allergic and other immunologic skin disorders

The human skin hosts a variety of immune response-associated components that together form the skin immune system. Any abnormality in the functioning of the skin immune system leads to a variety of dermatologic complications, including dermatitis, psoriasis, and eczema. Exposure to antigens/allergens can lead to allergic skin disorders such as atopic dermatitis, urticaria, and allergic contact dermatitis. Recent investigations have provided new insights into the immunologic processes leading to the development of skin diseases. T cells play a central role in the activation and regulation of immune responses by recognizing antigen and inducing cytokine production. Despite advances in the understanding of the immunologic events leading to the development of skin diseases, no effective prevention measure exists. Current therapeutic treatments are based on either alleviating the symptoms or suppressing the immune system with immunosuppressive drugs. Allergen-specific immunotherapy is expected to induce specific T cells that abolish allergen-induced proliferation of T helper cells, as well as their cytokine production. Recent approaches using recombinant protein, polycytosine guanine oligonucleotides, and plasmid DNA for vaccination suggest the possibility of protection against these skin disorders. The involvement of T cells in psoriasis indicates that the development of a T-cell receptor peptide vaccine may be beneficial. Dendritic cell-based vaccines using tolerogenic dendritic cells that can induce T-cell tolerance have been shown to be useful in dealing with autoimmune disorders and allergic conditions. In the light of these developments, this article presents the current status and prospects of developing vaccines for allergic and other immunologic skin disorders.

Urticaria and angioedema: an overview

Persistent or frequent episodes of urticaria are difficult to evaluate and treat. The best test to identify most patients with a specific underlying cause (eg, physical trigger, allergen, systemic disease) likely is the taking of a careful and detailed history and performance of a physical examination by a specialist who is knowledgeable in urticarial disease. Further study of the pathogenesis and treatment of urticaria is crucial. Given the limited efficacy of presently approved antihistamine treatments and the significant side effects of steroids and cyclosporine, there is a pressing need to evaluate other anecdotally supported urticaria treatments in randomized, controlled trials.

Chronic urticaria and thyroid disease

Because the association of thyroid disease with pruritus and urticaria dates back more than 50 years, many investigators have commented on the possible link between autoimmune thyroid disease and chronic urticaria. This article summarizes an evolving body of literature linking these two conditions and discusses potential mechanisms as to how they concomitantly occur. Treatment options used to manage and control the urticaria are discussed with a focus on how the thyroid gland may have a role in the possible mechanism leading to chronic urticaria in this setting and how thyroid hormone may contribute to resolution of this condition.

Urticaria and urticarial vasculitis

Urticaria and urticarial vasculitis may be triggered by allergens, infection, autoimmunity and other immunological conditions. Careful evaluation, skin biopsy and specific laboratory tests can assist in diagnosis. The appropriate use of antihistamines, glucocorticoids, and other immunomodulators are discussed.