Abstract
Both growth hormone (GH) and insulin-like growth factor (IGF)-I have receptors in the brain, in particular in areas that are involved in cognitive function. Therefore, it has been hypothesized that GH deficiency can lead to cognitive dysfunction, and that somatropin replacement therapy may have beneficial effects on cognitive function in GH-deficient patients. In this review, an overview is given regarding the possible effects of decreased activity of the GH/IGF-I axis and somatropin therapy in GH deficiency in relation to cognitive function. The available data regarding cognitive function in GH-deficient patients are limited, but suggest that this condition can lead to specific cognitive changes, in particular attentional deficits and altered processing speed. The underlying mechanisms and the effects of somatropin treatment on cognitive function in GH deficiency are still unclear. Similar studies to those performed in patients with GH deficiency have been performed regarding the cognitive changes in elderly patients with relatively low GH and/or IGF-I levels. Large controlled studies regarding the effects and safety of somatropin treatment in healthy elderly patients have not been performed.
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