OSP-Immunofluorescent remyelinating oligodendrocytes in the brainstem of toxically-demyelinated Wistar rats.
Central nervous system (CNS) remyelination following toxically-induced demyelination is a well known process. Oligodendrocytes constitute the bulk of the myelinating cells in the brain whereas Schwann cells overwhelm oligodendrocytes numbers in spinal cord remyelination. Despite the common knowledge of these facts, we still do not know completely the origin of both remyelinating cells. The present study investigated the participation of mature oligodendrocytes in remyelination after ethidium-bromide (EB) induced demyelination in the brainstem of normal and cyclosporin A-immunosuppressed Wistar rats. Thirty adult female rats were divided into three experimental groups. In group 1 the rats received a single intracisternal injection of 10 microL of 0.1% ethidium bromide (EB) in 0.9% saline (n=10); in group 2 the rats received the EB injection while immunosuppressed with cyclosporin A (n=10); in group 3 the rats received a single 10 microL injection of 0.9% saline while treated with cyclosporin A. The rats were killed at 15, 21 and 31 days after injection. Within the EB lesions, from 15 days onward many cells within the periphery of the lesions stained positive for OSP (oligodendrocyte specific protein) a marker for mature oligodendrocytes and myelin. This cell marking signals that, at least, part of the process of repairing the myelin sheaths is carried out by mature cells of the oligodendrocyte lineage.
Sallis
Eliza Simone Viégas
ES
PPPGMV da Universidade Federal de Santa Maria RS, Brazil.
Mazzanti
Cinthia Melazzo
CM
Mazzanti
Alexandre
A
Pereira
Luis Antonio Violin
LA
Arroteia
Kélen Fabíola
KF
Fustigatto
Rafael
R
Pelizzari
Charles
C
Rodrigues
Aline
A
Graça
Dominguita Lühers
DL
D000818:Animals; D001933:Brain Stem / Q000166:cytology* / Q000187:drug effects; D057167:Claudins; D016572:Cyclosporine / Q000494:pharmacology; D003711:Demyelinating Diseases / Q000139:chemically induced / Q000473:pathology*; D004195:Disease Models, Animal; D004996:Ethidium; D005260:Female; D005455:Fluorescent Antibody Technique; D007166:Immunosuppressive Agents / Q000494:pharmacology; D009186:Myelin Sheath / Q000187:drug effects / Q000502:physiology; D009419:Nerve Tissue Proteins / Q000276:immunology; D009836:Oligodendroglia / Q000166:cytology* / Q000187:drug effects / Q000502:physiology; D051381:Rats; D017208:Rats, Wistar
D057167:Claudins; C492353:Cldn11 protein, rat; D007166:Immunosuppressive Agents; D009419:Nerve Tissue Proteins; D016572:Cyclosporine; D004996:Ethidium