Striatal interneurons in dissociated cell culture

Area of Science:

• Neuroscience
• Developmental Neuroscience
• Cell Biology

Background:

• The striatum contains four major interneuron types: three GABAergic and one cholinergic.
• Dissociated striatal cell cultures typically lack the crucial giant aspiny cholinergic interneuron.
• Understanding striatal circuitry requires accurate representation of all interneuron populations.

Purpose of the Study:

• To establish a reliable method for culturing all major striatal interneuron types, including cholinergic interneurons.
• To investigate the developmental origins of striatal interneurons, particularly cholinergic ones.
• To create a model for studying striatal function and the role of cholinergic interneurons in vivo.

Main Methods:

• Combining dissociated striatal neurons from different embryonic ages (E14.5 and E18.5 in rats; E12.5 and E14.5 in mice).
• Culturing mixed-age striatal cells for 5 weeks in vitro.
• Characterizing interneuron populations using morphological and potentially molecular markers.

Main Results:

• Combining E14.5 and E18.5 rat striatal cells yielded surviving cholinergic interneurons and other types.
• Mouse cultures (E12.5/E14.5) contained all four major interneuron classes, but E14.5 alone had few cholinergic neurons.
• Later mouse dissection (E16.5) resulted in cultures lacking cholinergic interneurons, similar to rat cultures.

Conclusions:

• Mixing cells from different embryonic ages creates striatal cultures with more accurate interneuron proportions than traditional methods.
• Cholinergic interneurons originate from younger embryonic medial ganglionic eminence precursors.
• This method allows for parallel cultures of intact and cholinergic-depleted striatum to study cholinergic interneuron function.