Analogs of the sea anemone potassium channel blocker ShK for the treatment of autoimmune diseases

Christine Beeton, Michael Pennington, Raymond Norton

Research output: Contribution to journalArticleResearchpeer-review

63 Citations (Scopus)

Abstract

CCR7- effector memory T (TEM) lymphocytes are involved in autoimmune diseases such as multiple sclerosis, type 1 diabetes mellitus and rheumatoid arthritis. These cells express Kv1.3 potassium channels that play a major role in their activation. Blocking these channels preferentially inhibits the activation of CCR7- TEM cells, with little or no effects on CCR7+ naive and central memory T cells. Blockers of lymphocyte Kv1.3 channels therefore show considerable potential as therapeutics for autoimmune diseases. ShK, a 35-residue polypeptide isolated from the Caribbean sea anemone Stichodactyla helianthus, blocks Kv1.3 channels at picomolar concentrations. Although ShK was effective in treating rats with delayed type hypersensitivity and a model of multiple sclerosis, it lacks selectivity for Kv1.3 channels over closely-related Kv1 channels. Extensive mutagenesis studies combined with elucidation of the structure of ShK led to models of ShK docked with the channel. This knowledge was valuable in the development of new ShK analogs with improved selectivity and increasing stability, which have proven efficacious in preventing and/or treating animal models of delayed type hypersensitivity, type 1 diabetes, rheumatoid arthritis, and multiple sclerosis without inducing generalized immunosuppression. They are currently undergoing further evaluation as potential immunomodulators for the treatment of autoimmune diseases.
Original languageEnglish
Pages (from-to)313 - 321
Number of pages9
JournalInflammation & Allergy - Drug Targets
Volume10
Issue number5
DOIs
Publication statusPublished - 2011

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