P25alpha/Tubulin polymerization promoting protein expression by myelinating oligodendrocytes of the developing rat brain.
P25alpha/tubulin polymerization promoting protein (TPPP) is a brain specific phosphoprotein that displays microtubule bundling activity. In the mature brain, p25alpha/TPPP distributes to oligodendrocytes and choroid plexus epithelium. We mapped the spatial and temporal distribution of p25alpha/TPPP in the developing rat brain. Having localized its expression to neuronal tissue by Western blot analyses, the distribution of p25alpha/TPPP to developing oligodendrocytes was confirmed using a specific antibody. In the pre-natal and post-natal brain, p25alpha/TPPP was localized to the perinuclear cytoplasm of myelinating oligodendrocytes from embryonic (E) day E20 as verified from cellular co-localization with 2',3'-cyclic nucleotide 3'-phosphodiesterase (CNP). Oligodendrocyte progenitor cells and pre-myelinating oligodendrocytes identified by the expression of NG2 proteoglycan and CD9, respectively, both failed to contain p25alpha/TPPP. In contrast, P25alpha/TPPP co-localized with beta(IV)-tubulin from post-natal (p) day P10 suggesting that p25alpha/TPPP plays an important role for tubulin-related transport in developing, myelinating oligodendrocytes.
Skjoerringe
Tina
T
Institute of Medical Anatomy, University of Copenhagen, Copenhagen, Denmark.
Lundvig
Ditte M S
DM
Jensen
Poul H
PH
Moos
Torben
T
D000818:Animals; D001921:Brain / Q000196:embryology / Q000502:physiology*; D047108:Embryonic Development; D006801:Humans; D009186:Myelin Sheath / Q000502:physiology*; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism*; D009836:Oligodendroglia / Q000502:physiology*; D051381:Rats; D017208:Rats, Wistar; D011994:Recombinant Proteins / Q000378:metabolism; D014404:Tubulin / Q000378:metabolism*
D009419:Nerve Tissue Proteins; D011994:Recombinant Proteins; C118136:TPPP protein, human; D014404:Tubulin