The reaction of the subependymal layer of lateral brain ventricles to striatal ibotenic acid lesions in a long-term study.
The proliferative activity in the subependymal layer of lateral brain ventricles in adulthood is known. We were interested in the reaction of this layer to ibotenic acid lesions, which simulate neurodegenerative processes in Huntington's disease. Animals with a unilateral ibotenic acid lesion were compared with sham-lesioned animals and control animals with intact brains at 5 and 13 weeks after surgery. Five weeks after surgery, increased proliferation was found in most GFAP-positive astrocytes and to a lesser extent in CNPase-positive oligodendrocytes in comparison with controls. Interestingly, a slight increase in proliferation was found as well in the contralateral non-lesioned hemispheres. Moderate elevation of cell proliferation was found after induction of sham-lesions as well. The intensity of the reaction in the subependymal layer decreased in the following 8 weeks. Only a few scattered cells that originated from the subependymal layer had migrated over a short distance to adjacent brain tissue. We conclude that the reaction of the subependymal layer is (a) non-specific, as it is a response to any type of lesion, and (b) slowly decreases in time.
Mazurová
Yvona
Y
Department of Histology and Embryology, Charles University in Prague, Faculty of Medicine in Hradec Králové, Hradec Králové, Czech Republic. mazurova@lfhk.cuni.cz
Valousková
Vĕra
V
Osterreicher
Jan
J
D015087:2',3'-Cyclic-Nucleotide Phosphodiesterases / Q000032:analysis; D000818:Animals; D001253:Astrocytes / Q000737:chemistry / Q000187:drug effects / Q000473:pathology; D001973:Bromodeoxyuridine / Q000032:analysis; D004805:Ependyma / Q000737:chemistry / Q000187:drug effects* / Q000473:pathology; D018690:Excitatory Amino Acid Agonists / Q000633:toxicity*; D005904:Glial Fibrillary Acidic Protein / Q000032:analysis; D007051:Ibotenic Acid / Q000633:toxicity*; D007150:Immunohistochemistry; D019394:Ki-67 Antigen / Q000032:analysis; D020547:Lateral Ventricles / Q000737:chemistry / Q000187:drug effects* / Q000473:pathology; D009836:Oligodendroglia / Q000737:chemistry / Q000187:drug effects / Q000473:pathology; D018809:Proliferating Cell Nuclear Antigen / Q000032:analysis; D051381:Rats; D020318:Rats, Long-Evans
D018690:Excitatory Amino Acid Agonists; D005904:Glial Fibrillary Acidic Protein; D019394:Ki-67 Antigen; D018809:Proliferating Cell Nuclear Antigen; D007051:Ibotenic Acid; D015087:2',3'-Cyclic-Nucleotide Phosphodiesterases; D001973:Bromodeoxyuridine