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Impact of Growth Hormone on Microglial and Astrocytic Function
Mariana R Tavares1, Frederick Wasinski2, Martin Metzger1
1Department of Physiology and Biophysics, Instituto de Ciencias Biomedicas, Universidade de Sao Paulo, Sao Paulo, SP 05508-000, Brazil.
Journal of Integrative Neuroscience
|February 29, 2024
Summary
Growth hormone (GH) impacts the central nervous system (CNS) by supporting neurons and glial cells. This review clarifies GH
Area of Science:
- Neuroendocrinology
- Glial cell biology
- Central nervous system (CNS) research
Background:
- Growth hormone (GH) plays critical roles in the CNS, including neuroprotection, neuroregeneration, and metabolic regulation.
- Differentiating the specific functions of GH and its downstream mediator, insulin-like growth factor-1 (IGF-1), presents a significant challenge due to their interconnected actions.
- While neuronal actions of GH/IGF-1 are well-studied, their roles in non-neuronal CNS cells, particularly glial cells, require further elucidation.
Purpose of the Study:
- To review and synthesize existing literature on the direct effects of GH on various glial cell types within the CNS.
- To distinguish the specific contributions of GH from those of IGF-1 in glial cell function.
- To highlight the importance of glial cells (microglia, astrocytes, oligodendrocytes, tanycytes) in CNS health and neuronal support.
Main Methods:
- Comprehensive literature search and review of studies investigating GH and IGF-1 interactions with CNS glial cells.
- Analysis of experimental data to identify direct GH effects versus indirect IGF-1-mediated effects.
- Synthesis of findings to provide a clear overview of GH's role in glial biology.
Main Results:
- GH exerts direct effects on glial cells, influencing their survival, proliferation, and function.
- Evidence suggests distinct roles for GH and IGF-1 in modulating glial cell responses.
- Glial cells are crucial for neuronal survival, differentiation, and proliferation, underscoring the significance of GH's impact on these cells.
Conclusions:
- GH has direct and significant roles in regulating glial cell functions within the CNS.
- Understanding these direct GH effects is essential for a comprehensive view of neuroendocrine regulation and CNS homeostasis.
- Further research is warranted to fully delineate the specific mechanisms by which GH influences glial cells and their contribution to overall brain health.
