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The aging male hypothalamic-pituitary-gonadal axis: pulsatility and feedback
Johannes D Veldhuis1, Daniel M Keenan, Peter Y Liu
1Endocrine Research Unit, Department of Internal Medicine, Mayo Clinic College of Medicine, Mayo Clinic, 200 First Steet SW, Rochester, MN 55905, United States. veldhuis.johannes@mayo.edu
Aging impairs the male hypothalamic-pituitary-gonadal axis. This review uses mathematical models to analyze integrative adaptations in aging males, focusing on hormonal signaling dynamics.
Area of Science:
- Endocrinology
- Aging Research
- Systems Biology
Background:
- Aging is associated with gradual declines in the function of the hypothalamus, pituitary gland, and gonads.
- These endocrine functions are regulated by complex, time-delayed hormonal signals, including gonadotropin-releasing hormone (GnRH), luteinizing hormone (LH), and sex steroids (testosterone/estradiol).
- Understanding these age-related changes requires a systems-level approach to model the entire axis.
Purpose of the Study:
- To review integrative adaptations within the aging male hypothalamic-pituitary-gonadal (HPG) axis.
- To highlight the application of objective ensemble models in assessing these changes.
- To provide a framework for understanding the complex dynamics of hormonal regulation during male aging.
Main Methods:
- Review of recent scientific literature focusing on the aging male HPG axis.
- Analysis of studies employing ensemble modeling techniques.
- Integration of data from objective assessments of the HPG axis as a whole.
Main Results:
- Aging male HPG axis exhibits complex, integrated adaptive changes.
- Ensemble models provide a robust framework for assessing these dynamics.
- Hormonal signaling pathways (GnRH, LH, Te/E2) show altered time-delayed exchanges with age.
Conclusions:
- The aging male HPG axis undergoes significant integrative adaptations.
- Mathematical and ensemble modeling approaches are crucial for understanding these age-related endocrine shifts.
- Further research using these models can elucidate mechanisms of male aging and potential interventions.
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