Growth hormone and aging

Area of Science:

• Gerontology
• Endocrinology
• Neuroscience

Background:

• Elderly individuals commonly experience vascular and central nervous system (CNS) degenerative changes, leading to significant morbidity and mortality.
• Factors like lipid pattern modifications and menopause contribute to these age-related alterations.
• Vascular homeostasis relies on the endothelium's production of vasoactive factors, which can be affected by aging and hormonal changes.

Purpose of the Study:

• To investigate the effects of growth hormone (GH) on vascular and CNS functions in aged rats.
• To clarify the role of physiological GH deficiency in age-related functional decline.
• To evaluate GH's impact on endothelial function, neuronal populations, and neurotransmitter levels in vivo.

Main Methods:

• A study using aged Wistar rats was conducted to assess GH's effects under chronic in vivo conditions.
• Vascular responses to vasoactive substances were evaluated in aortic rings.
• Neuronal counts in the hippocampus and neurotransmitter levels in cerebral areas were measured and compared between young, old, and GH-treated old rats.

Main Results:

• Aged rats exhibited increased aortic media thickness and reduced vasodilator response to isoprenaline compared to young rats.
• GH treatment partially restored vasodilator response and decreased aortic media thickness in aged rats.
• GH administration significantly increased hippocampal neuronal populations and normalized neurotransmitter levels (glutamine, arginine, aspartate, citrulline) in aged rats.

Conclusions:

• Physiological GH deficiency in the elderly may contribute to vascular and cerebral dysfunction.
• GH treatment demonstrated beneficial effects on vascular endothelium function and CNS integrity in aged rats.
• GH therapy holds potential for mitigating age-related vascular and neurodegenerative changes.