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Updated: Aug 9, 2026
Whole-cell Patch-clamp Recordings from Morphologically- and Neurochemically-identified Hippocampal Interneurons
Published on: September 30, 2014
Parvalbumin in the human anterior cingulate cortex: morphological heterogeneity of inhibitory interneurons
Insights
Parvalbumin (PV) marks specific GABAergic interneurons in the human anterior cingulate cortex. This study maps PV-positive structures, revealing eight interneuron classes and their distribution, aiding research into brain disorders.
Area of Science:
- Neuroscience
- Cell Biology
- Neuroanatomy
Background:
- Parvalbumin (PV) is a calcium-binding protein.
- PV serves as a marker for a specific subset of GABAergic cortical interneurons.
- Understanding PV distribution is crucial for cortical circuitry research.
Purpose of the Study:
- To characterize the distribution and morphology of parvalbumin-immunoreactive (PV-IR) structures in the human anterior cingulate cortex (Brodmann's area 24).
- To classify PV-IR interneurons based on their morphology and laminar distribution.
- To establish a "PV immunoarchitecture" for future studies on neurodevelopmental and neurodegenerative disorders.
Main Methods:
- Indirect immunocytochemistry using an antibody against parvalbumin (PV).
- Analysis of serial sections of human anterior cingulate cortex (Brodmann's area 24).
- Morphological and laminar distribution analysis of PV-immunoreactive interneurons and neuropil.
Main Results:
- PV-positive structures exhibited layer- and cell type-specific distribution within area 24.
- Eight distinct classes of PV-immunoreactive interneurons were identified based on morphology and laminar patterns.
- PV immunoreactivity in the neuropil formed dense bands in layers III and Vb, with axon cartridges predominantly in layers V and VI.
Conclusions:
- The study established a detailed "PV immunoarchitecture" of the human anterior cingulate cortex.
- This detailed mapping provides a foundation for investigating PV's role in cortical circuitry.
- Changes in PV immunoreactivity may offer insights into neurodevelopmental and neurodegenerative conditions.
Abstract:
The calcium-binding protein parvalbumin (PV) is a marker for a certain subset of GABAergic cortical interneurons. In the present study, indirect immunocytochemistry with an antibody against PV was performed on serial sections of human anterior cingulate cortex (Brodmann's area 24), an important relay centre of the limbic system. PV-positive structures are distributed in a layer- and cell type-specific manner. Based on morphological features and laminar distribution pattern, PV-immunoreactive interneurons are subdivided into eight different classes. PV immunoreactivity within the neuropil comprises dendritic and axonal processes. Area 24 contains two densely immunolabelled neuropil bands in layers III and Vb. Axon cartridges are preferably located in layers V and VI. The results provide a "PV immunoarchitecture' as a basis for further studies of PV immunoreactivity under pathological conditions. PV is assumed to play a role in maintaining calcium homeostasis in nerve cells, and to modulate neuronal excitability and resistance to biochemical damage. On the other hand, PV immunoreactivity has recently been shown to undergo characteristic changes during different stages of brain maturation. Therefore, examination of PV-positive structures will provide new insights into cortical circuitry in neurodegenerative as well as neurodevelopmental disorders.
