NG2+/Olig2+ cells are the major cycle-related cell population of the adult human normal brain.
A persistent cycling cell population in the normal adult human brain is well established. Neural stem cells or neural progenitors have been identified in the subventricular zone and the dentate gyrus subgranular layer (SGL), two areas of persistent neurogenesis. Cycling cells in other human normal brain areas, however, remains to be established. Here, we determined the distribution and identity of these cells in the cortex, the white matter and the hippocampal formation of adult patients with and without chronic temporal lobe epilepsy using immunohistochemistry for the cell cycle markers Ki-67 (Mib-1) and minichromosome maintenance protein 2. Rare proliferative neuronal precursors expressing the neuronal antigen neuronal nuclei were restricted to the SGL. In contrast, the oligodendrocyte progenitor cell markers Olig2 and the surface antigen NG2 were expressed by the vast majority of cycling cells scattered throughout the cortex and white matter of both control and epileptic patients. Most of these cycling cells were in early G1 phase, and were significantly more numerous in epileptic than in non-epileptic patients. These results provide evidence for a persistent gliogenesis in the human cortex and white matter that is enhanced in an epileptic environment.
Geha
Sameh
S
Department of Neuropathology, Sainte-Anne Hospital, Paris, France.
Pallud
Johan
J
Junier
Marie-Pierre
MP
Devaux
Bertrand
B
Leonard
Nadine
N
Chassoux
Francine
F
Chneiweiss
Hervé
H
Daumas-Duport
Catherine
C
Varlet
Pascale
P
D000328:Adult; D053687:Adult Stem Cells / Q000502:physiology*; D000368:Aged; D000941:Antigens / Q000378:metabolism*; D051792:Basic Helix-Loop-Helix Proteins / Q000378:metabolism*; D001921:Brain / Q000502:physiology*; D002453:Cell Cycle / Q000502:physiology*; D018797:Cell Cycle Proteins / Q000378:metabolism; D002540:Cerebral Cortex / Q000502:physiology; D002908:Chronic Disease; D004833:Epilepsy, Temporal Lobe / Q000378:metabolism; D005260:Female; D006624:Hippocampus / Q000502:physiology; D006801:Humans; D019394:Ki-67 Antigen / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D064111:Minichromosome Maintenance Complex Component 2; D009413:Nerve Fibers, Myelinated / Q000502:physiology; D009419:Nerve Tissue Proteins / Q000378:metabolism*; D055495:Neurogenesis / Q000502:physiology; D009474:Neurons / Q000502:physiology; D009687:Nuclear Proteins / Q000378:metabolism; D000076104:Oligodendrocyte Transcription Factor 2; D009836:Oligodendroglia / Q000502:physiology*; D011509:Proteoglycans / Q000378:metabolism*; D055815:Young Adult; D000099216:Chondroitin Sulfate Proteoglycan 4
D000941:Antigens; D051792:Basic Helix-Loop-Helix Proteins; D018797:Cell Cycle Proteins; D019394:Ki-67 Antigen; D064111:Minichromosome Maintenance Complex Component 2; D009419:Nerve Tissue Proteins; D009687:Nuclear Proteins; D000076104:Oligodendrocyte Transcription Factor 2; D011509:Proteoglycans; D000099216:Chondroitin Sulfate Proteoglycan 4; C405708:OLIG2 protein, human; C084859:MCM2 protein, human