Abstract：
:Protein kinase C (PKC) is a family of serine/threonine kinases comprised of 10 isoforms. Although commercial antibodies are available for all 10 isoforms, the specificity of these antibodies has been questioned. We have identified immunoblot conditions in which commercially purchased PKC antibodies are specific for their respective isoform. We then used these conditions to determine that PKC isoforms alpha, betaI, betaII, delta, epsilon, gamma, lambda, theta, and zeta are present in rat primary cultured cerebellar granule cells (CGCs) 6-14 days in vitro (DIV). This PKC profile is identical to that observed in cerebellar homogenates taken from 6-, 14- and 21-day-old rats. Western blot analysis indicated that the classical and the atypical PKC isoforms were more prevalent in the cytosolic subcellular fraction compared to the particulate fraction under basal conditions. Immunoreactivity for the novel isoforms tended to be higher in the particulate fraction under basal conditions. Phorbol 12-myristate 13-acetate (PMA) treatment resulted in translocated immunoreactivity from the cytosolic to the particulate fraction for all of the classical and novel PKC isoforms, but not for the atypical isoforms. However, the degree of translocation as well as the speed of translocation varied among the isoforms. The stability of the individual isoforms after PMA-induced activation also varied among the isoforms. Differences in these parameters were dependent upon culture batches and PKC isoform groups. We have identified experimental conditions in which reproducible results can be obtained with primary cultured CGCs in the study of PKC. We discuss possible solutions for problems encountered when utilizing primary cultured neurons to study PKC-mediated signal transduction.
journal_name
Brain Resjournal_title
Brain researchauthors
Popp RL,Velasquez O,Bland J,Hughes Pdoi
10.1016/j.brainres.2006.01.110subject
Has Abstractpub_date
2006-04-14 00:00:00pages
70-84issue
1eissn
0006-8993issn
1872-6240pii
S0006-8993(06)00309-Xjournal_volume
1083pub_type
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