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Minireview: Role of the Growth Hormone/Insulin-Like Growth Factor System in Mammalian Aging

Departments of Physiology and Internal Medicine, Southern Illinois University School of Medicine, Springfield, Illinois 62794

Address all correspondence and requests for reprints to: Andrzej Bartke, P.O. Box 19628, 801 North Rutledge, Room 4389, Springfield, Illinois 62794-9628 E-mail: abartke{at}siumed.edu.

The important role of IGF and insulin-related signaling pathways in the control of longevity of worms and insects is very well documented. In the mouse, several spontaneous or experimentally induced mutations that interfere with GH biosynthesis, GH actions, or sensitivity to IGF-I lead to extended longevity. Increases in the average life span in these mutants range from approximately 20–70% depending on the nature of the endocrine defect, gender, diet, and/or genetic background. Extended longevity of hypopituitary and GH-resistant mice appears to be due to multiple mechanisms including reduced insulin levels, enhanced insulin sensitivity, alterations in carbohydrate and lipid metabolism, reduced generation of reactive oxygen species, enhanced resistance to stress, reduced oxidative damage, and delayed onset of age-related disease. There is considerable evidence to suggest that the genetic and endocrine mechanisms that influence aging and longevity in mice may play a similar role in other mammalian species, including the human.

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