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Preparation of Acute Human Hippocampal Slices for Electrophysiological Recordings
Published on: May 7, 2020
Aromatase expression in the normal and epileptic human hippocampus
Josue G Yague1, Iñigo Azcoitia, Javier DeFelipe
1Instituto Cajal, CSIC, Avenida Doctor Arce 37, E-28002 Madrid, Spain.
Brain Research
|October 10, 2009
Summary
Aromatase, an enzyme crucial for estrogen production, is widely found in human hippocampal neurons. This suggests local estrogen synthesis significantly impacts hippocampal function, even in cases of epilepsy and sclerosis.
Area of Science:
- Neuroscience
- Endocrinology
- Cell Biology
Background:
- Aromatase is essential for estrogen biosynthesis.
- Estrogen plays a role in neuronal plasticity within the hippocampus.
- Aromatase mRNA is present in the human hippocampus, but its cellular localization is unknown.
Purpose of the Study:
- To determine the cellular distribution of aromatase in the human hippocampus.
- To investigate if aromatase expression differs in normal versus epileptic and sclerotic hippocampi.
Main Methods:
- Immunohistochemistry was used to detect aromatase expression.
- The study examined tissue from normal, epileptic, and sclerotic human hippocampi.
- Aromatase localization was assessed in neurons and glial cells, including astrocytes.
Main Results:
- Aromatase was detected in CA1-CA3 pyramidal neurons, dentate gyrus granule cells, and specific interneurons (co-expressing calbindin, calretinin, or parvalbumin) in both normal and epileptic hippocampi.
- A small population of astrocytes showed aromatase immunoreactivity.
- Widespread neuronal expression was observed in normal and damaged hippocampal tissue.
Conclusions:
- Aromatase is broadly expressed in human hippocampal neurons.
- Local estrogen formation in the hippocampus is likely significant for its function.
- These findings are relevant to understanding hippocampal function in both health and disease states like epilepsy.
