title: Post-natal changes of cyclin-dependent kinase 5 activator expression in the developing rat cerebellum.
abstract: cDNA of cyclin-dependent kinase 5 (Cdk5) was cloned based on its primary sequence homology to Cdc2 and Cdk2. Cdk5 requires the neuronal Cdk5 activators such as p35 or p39(nck5ai) (p39) for its activity. In this study, we examined post-natal changes in the p39 expression pattern during the development of the rat cerebellum. p39 began to express in somata and dendrites of Purkinje cells at post-natal day 3 (PD3). In particular, at PD12, parasagittal bands (stripes) with p39 immunoreactivity were weakly observed. At PD21, p39-immunoreactive stripes were developed when compared with the PD12 group. At this age stage, p39 immunoreactivity became weak in somata of Purkinje cells, not forming stripes. At PD28, a series of parasagittal bands were more distinct than those of the PD21 group, and p39 immunoreactivity disappeared in Purkinje cells, not forming p39 immunoreactive stripes. In the adults, p39 immunoreactivity in Purkinje cells was similar to that found in the PD28 group which showed that parasagittal bands were very narrow, and became progressively more slender. Therefore, we suggest that the post-natal changes of p39 expression in Purkinje cells in the cerebellum is an autonomous characteristic of Purkinje cells with a role of Cdk5 activators.
authors.affiliation: Department of Anatomy, College of Medicine, Konyang University, Nonsan, Chungnam 320-711, South Korea. ygjeong@konyang.ac.kr
authors.forename: Y G
authors.initials: YG
authors.lastname: Jeong
authors.forename: K Y
authors.initials: KY
authors.lastname: Lee
authors.forename: B C
authors.initials: BC
authors.lastname: Lee
authors.forename: N S
authors.initials: NS
authors.lastname: Lee
authors.forename: K Y
authors.initials: KY
authors.lastname: Lee
authors.forename: M H
authors.initials: MH
authors.lastname: Won
authors.forename: Y
authors.initials: Y
authors.lastname: Fukui
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D002531:Cerebellum / Q000201:enzymology / Q000378:metabolism*; D051360:Cyclin-Dependent Kinase 5; D018844:Cyclin-Dependent Kinases / Q000378:metabolism*; D009419:Nerve Tissue Proteins / Q000096:biosynthesis* / Q000378:metabolism; D011689:Purkinje Cells / Q000201:enzymology / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: C108298:Cdk5 activator p39; D009419:Nerve Tissue Proteins; D051360:Cyclin-Dependent Kinase 5; C495907:Cdk5 protein, rat; D018844:Cyclin-Dependent Kinases