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Updated: Oct 2, 2026
Immunohistochemistry and Multiple Labeling with Antibodies from the Same Host Species to Study Adult Hippocampal Neurogenesis
Published on: April 22, 2015
Cholinergic innervation and calretinin-immunoreactive neurones in the hippocampus during postnatal development of the
Beata Ludkiewicz1, Sławomir Wójcik, Edyta Spodnik
1Department of Anatomy and Neurobiology, Medical University of Gdańsk, ul. Debinki 1, 80-211 Gdańsk, Poland.
Insights
Cholinergic innervation of hippocampal calretinin cells in rats is sparse. This suggests that the cholinergic system may not be essential for the function of these specific calretinin-containing neurons.
Area of Science:
- Neuroscience
- Cell Biology
- Developmental Biology
Background:
- Calretinin-containing neurons are a distinct population within the hippocampus.
- Cholinergic systems play crucial roles in hippocampal function, including learning and memory.
- The precise interactions between cholinergic inputs and calretinin cells during development are not fully understood.
Purpose of the Study:
- To investigate the developmental and adult cholinergic innervation of calretinin-containing neurons in the rat hippocampus.
- To determine the extent of synaptic contact between cholinergic terminals and calretinin-positive cells.
Main Methods:
- Immunohistochemistry was used to co-localize vesicular acetylcholine transporter (VAChT) and calretinin.
- Rat brains at various postnatal ages (P0-P60) were analyzed.
- Confocal laser-scanning microscopy was employed for detailed imaging.
Main Results:
- Sparse synaptic contacts were observed between VAChT-immunoreactive terminals and calretinin-containing neurons.
- These contacts were present in both developing and adult rat hippocampi.
- The density of cholinergic innervation on calretinin cells was notably low.
Conclusions:
- Cholinergic innervation of hippocampal calretinin-containing neurons is limited.
- The cholinergic system is likely not the primary modulator of calretinin cell function.
- Other neuronal systems may exert a greater influence on calretinin-positive hippocampal neurons.
Abstract:
Immunohistochemical study of the cholinergic innervation of the hippocampal calretinin-containing cells was conducted on 28 rat brains of postnatal ages: P0, P4, P7, P14, P21, P30 and P60. Sections with double immunostaining for vesicular acetylcholine transporter (VAChT; the marker of cholinergic cells, fibres and terminals) and calretinin were analysed using confocal laser-scanning microscope. Obtained data demonstrate that during development as well as in adult species calretinin-containing neurones in the rat hippocampus form sparse synaptic contact with VAChT-ir terminals. It seems probable that cholinergic innervation is not crucial for the functioning of CR-ir cells--probably they remain under the greater influence of a system other than the cholinergic system.
