OLN-93 Cells

OLN-93 is a permanent oligodendroglial cell line derived from primary glial cultures of neonatal rat brain. The cell line originated from spontaneously transformed cells in mixed glial cultures and was characterized to maintain stable oligodendroglial properties over extended culture periods. OLN-93 cells proliferate continuously in the presence of serum, with a doubling time of approximately 16-18 hours, and retain key features of differentiated oligodendrocytes. Immunocytochemical and biochemical analyses demonstrate that these cells express major myelin-specific markers including galactocerebroside (GC), myelin basic protein (MBP), myelin-associated glycoprotein (MAG), proteolipid protein (PLP), and Wolfgram protein (WP). The expression of PLP and its alternatively spliced isoform DM20 has been confirmed at the mRNA level using RT-PCR.

Importantly, OLN-93 cells do not express the astrocytic markers vimentin and glial fibrillary acidic protein (GFAP), nor the oligodendrocyte precursor marker A2B5, indicating a differentiated, non-precursor phenotype. Morphologically, the cells exhibit a bipolar appearance under standard culture conditions and develop arborized processes when grown at low density or in low-serum environments, resembling immature or early postnatal oligodendrocytes. These characteristics make OLN-93 a valuable model for studying oligodendrocyte differentiation, myelin protein expression, and interactions with neurons or other glial cell types in vitro.

OLN-93 cells have also been genetically engineered to study neurodegenerative disease processes. For instance, when transfected to express human α-synuclein (including the A53T mutant) and tau protein, they serve as a model to investigate mechanisms of protein aggregation under stress. Upon exposure to oxidative and proteasomal stress, OLN-93 cells form thioflavin S-positive aggregates that co-localize with α-synuclein, tau, and αB-crystallin, resembling glial cytoplasmic inclusions seen in synucleinopathies such as multiple system atrophy. These stress-induced changes in protein solubility and aggregate composition underline OLN-93’s utility as a model system to explore proteostasis, chaperone biology, and the cellular responses of oligodendrocytes to pathological protein aggregation.