Abstract
Epidemiological studies have highlighted the need for tight control of growth hormone (GH) and insulin-like growth factor I (IGF-I) in patients with acromegaly. Studies highlighting the events involved in GH receptor signaling have allowed the development of a pegylated GH receptor antagonist (pegvisomant) for use in humans, which has been designed to outcompete GH for the GH receptor, but which contains a position 120 amino acid substitution that prevents recruitment of a second GH receptor. This process of receptor dimerisation is crucial for signal transduction and IGF-I generation. Clinical trials of pegvisomant suggest it is the most effective treatment for acromegaly to date, as this therapy is capable of normalising serum IGF-I in up to 97% of patients when doses of 40 mg per day are used. This paper reviews the development of pegvisomant and the clinical experience in patients with acromegaly to date.
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