Choline acetyltransferase activity in mouse cerebellar cultures

Area of Science:

• Neuroscience
• Molecular Biology

Background:

• Choline acetyltransferase (ChAT) is a marker for neuronal survival in mouse cerebellar cultures.
• Immunocytochemistry shows ChAT in cerebellar mossy fiber terminals, which are typically extracerebellar.

Purpose of the Study:

• To investigate the origin of ChAT activity in mouse cerebellar cultures.
• To determine if ChAT activity is intrinsic to cerebellar neurons or derived from extrinsic inputs.

Main Methods:

• Cultured mouse cerebellar explants with and without dorsal pontine tissue.
• Assayed acetylcholine synthesis and ChAT activity.
• Used (naphthylvinyl)pyridine to confirm ChAT specificity.

Main Results:

• Cultures with pons exhibited well-developed glomerular structures and mossy fiber rosettes.
• Cultures containing pons showed 20-60 times higher ChAT activity than those without.
• ChAT activity was confirmed using a specific inhibitor.

Conclusions:

• The choline acetyltransferase activity in cerebellar cultures originates from the incorporated pontine tissue.
• Mossy fibers, originating from the pons, are the likely source of ChAT in these cerebellar cultures.