Aromatase as a Central Node in Astrocyte Health and Homeostasis

Area of Science:

• Neuroscience
• Endocrinology
• Astrocyte Biology

Background:

• Aromatase is crucial for estrogen synthesis, but its functions in astrocytes are underexplored.
• Astrocytes and brain estrogens are vital for neural health and disease modulation.
• Distinguishing astrocytic aromatase effects from other estradiol sources is challenging.

Purpose of the Study:

• To review evidence on aromatase modulating astrocytic functions.
• To identify knowledge gaps and research priorities.
• To explore the role of astrocytic aromatase in CNS homeostasis and repair.

Main Methods:

• Scoping review using the Population, Concept, Context (PCC) framework.
• Examination of primary research studies across species and experimental contexts.
• Synthesis of evidence on astrocytic aromatase activity and its downstream effects.

Main Results:

• Astrocytic aromatase is upregulated post-injury/stress, indicating a neuroprotective response.
• Aromatase modulates neuroinflammation by suppressing cytokines and gliosis.
• It enhances astrocytic metabolic resilience, particularly under oxidative stress, supporting neurons.
• Sex differences observed: females show higher expression and effects.
• Human studies are limited, hindering translational potential.

Conclusions:

• Astrocytic aromatase is a key regulator of CNS homeostasis and repair, especially in neurodegeneration.
• Its precise role needs further elucidation, distinct from neuronal/systemic estradiol.
• Therapeutic potential exists for modulating inflammation and enhancing brain resilience.
• Future research should prioritize sex-specific, human-based studies.