Cerebellar plasma membrane proteins and their antisera.

Area of Science:

• Neuroscience
• Cell Biology
• Developmental Biology

Background:

• Cerebellar development involves complex changes in cell composition and membrane protein expression.
• Understanding these molecular changes is crucial for deciphering cerebellar function and neurological disorders.

Purpose of the Study:

• To isolate and characterize plasma membrane proteins from developing mouse cerebella.
• To identify cell-specific and developmentally regulated membrane proteins within the cerebellum.
• To correlate specific membrane proteins with distinct cerebellar cell types.

Main Methods:

• Isolation of plasma membranes using differential centrifugation, aqueous two-phase polymer fractionation, and density gradient centrifugation.
• Analysis of protein composition via SDS-polyacrylamide gel electrophoresis (SDS-PAGE).
• Cell-specific protein identification using isolated cell fractions, neurological mutants, cell surface labeling (iodination, galactose oxidase), and antibody-based staining (immunoperoxidase, immunofluorescence).

Main Results:

• Identified developmental changes in cerebellar membrane protein abundance, with notable increases in proteins of 400, 340, 270, 220, 54, 44, and 9.5 kDa, and the disappearance of a 66 kDa protein.
• Localized specific proteins to Purkinje cells (p400, p14.7, p130) and granule neurons (p220, p30).
• p220 and p130 were found to bind to dissociated and cultured cerebellar cells, with p220 showing specificity for granule neuron precursors.

Conclusions:

• Specific membrane proteins are differentially expressed during cerebellar development and are localized to distinct cell types.
• The identified proteins, particularly p400, p130, and p220, serve as potential markers for Purkinje cells and granule neurons.
• This research provides a molecular basis for understanding cerebellar cell differentiation and function.