Abstract：
:High resolution immunogold cytochemistry was used to investigate the subcellular distribution of protein kinase C gamma and delta in Purkinje cells of the rat cerebellum. Postembedding incubation with an antibody raised to a peptide sequence near the C-terminus of protein kinase C gamma resulted in strong labelling along the dendrosomatic plasma membrane. A quantitative analysis indicated that this labelling reflected the existence of two pools of protein kinase C gamma; one membrane associated pool and one cytoplasmic pool located within 50 nm of the plasma membrane. The labelling along the plasma membrane showed a pronounced and abrupt increase when moving from the cell body into the axon initial segment. Gold particles signalling protein kinase C gamma were also enriched in putative Purkinje axon terminals in the dentate nucleus. The only organelle showing a consistent immunolabelling for protein kinase C gamma was the Golgi apparatus where the gold particles were restricted to the trans face. Protein kinase C gamma immunoreactivity also occurred in the Purkinje cell spines, with an enrichment in or near the postsynaptic density. Antibodies to protein kinase C delta produced a very different labelling pattern in the Purkinje cells. Most of the gold particles were associated with rough endoplasmic reticulum, particularly with those cisternae that were located close to the nucleus or in the nuclear indentations. No significant protein kinase C delta immunolabelling was detected at the plasma membrane or in Purkinje cell spines. The present data point to a highly specific compartmentation of the two major protein kinase C isozymes in Purkinje cells and suggest that these isozymes act on different substrates and hence have different regulatory functions within these neurons.
journal_name
Neurosciencejournal_title
Neuroscienceauthors
Cardell M,Landsend AS,Eidet J,Wieloch T,Blackstad TW,Ottersen OPdoi
10.1016/s0306-4522(97)00305-9subject
Has Abstractpub_date
1998-02-01 00:00:00pages
709-25issue
3eissn
0306-4522issn
1873-7544pii
S0306452297003059journal_volume
82pub_type
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