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Published on: February 17, 2016
Effects of hexachlorophene on myelin marker enzymes in rat oligodendrocytes
1Cellular Toxicology, Pfizer Central Research, Groton, CT 06340, USA.
Abstract:
The antibacterial substance hexachlorophene (HCP) can affect myelin formation or integrity leading to intramyelinic oedema and vacuolation in the central nervous system through an unknown mechanism. These studies were conducted to investigate the direct, dose-dependent effects of HCP on myelin membrane markers in cultured oligodendrocytes (OLG) isolated from 4-7-day-old rat pups and cultured in vitro for up to 5 wk. 2-wk-old OLG cultures were exposed to 0, 0.24 or 0.74 mum HCP for 48 hr. At 48 hr and again at 5, 12 and 19 days after the end of dosing the myelin markers galactosylceramide (GalC), myelin basic protein (MBP), and 2',3'-cyclic nucleotide 3'-phosphohydrolase (CNPase) were quantified by ELISA or biochemical techniques. DNA was measured to estimate total cell mass and astrocyte contamination was determined by an ELISA procedure using anti-glial fibrillary acidic protein (GFAP) as the primary antibody. Because of the use of a selective culture medium, astrocyte contamination was initially low and continued to decrease from wk 2 to 4 as determined by GFAP binding. CNPase, GalC and MBP levels were similar in control and low-dose (0.24 mum HCP) cultures with a general increase in MBP and CNPase over time. Cultures exposed to 0.74 mum HCP showed a decline in GalC proportional to decreased DNA content with time, but levels of MBP and CNPase increased after dosing and were always greater than the corresponding levels in control or low-dose cultures. These studies suggest a direct, dose-related toxic effect of HCP accompanied by a stimulation of MBP and CNPase but not of GalC production in the membranes of the recovering OLG following removal of HCP.
Insights
Hexachlorophene (HCP) exposure in cultured oligodendrocytes (OLG) revealed dose-dependent effects on myelin markers. High HCP doses caused toxicity and altered myelin protein production, suggesting a direct impact on myelin integrity.
Area of Science:
- Neuroscience
- Toxicology
- Cell Biology
Background:
- Hexachlorophene (HCP) is an antibacterial agent known to cause central nervous system damage.
- The precise mechanism by which HCP affects myelin formation and integrity remains unclear.
- Oligodendrocytes (OLG) are crucial for myelin production and maintenance in the central nervous system.
Purpose of the Study:
- To investigate the direct, dose-dependent effects of HCP on myelin membrane markers in cultured oligodendrocytes.
- To determine the impact of HCP on specific myelin components like GalC, MBP, and CNPase.
Main Methods:
- Primary cultures of rat oligodendrocytes (OLG) were exposed to varying concentrations of HCP (0, 0.24, 0.74 µM).
- Myelin markers (GalC, MBP, CNPase) were quantified using ELISA and biochemical assays over several weeks post-exposure.
- Cell mass (DNA) and astrocyte contamination (GFAP) were monitored to ensure culture purity and interpret results.
Main Results:
- Low-dose HCP (0.24 µM) showed no significant impact on myelin markers compared to controls.
- High-dose HCP (0.74 µM) led to a decline in GalC levels, proportional to reduced cell mass.
- Elevated levels of MBP and CNPase were observed post-HCP exposure, suggesting a compensatory or altered production response.
Conclusions:
- Hexachlorophene exerts a direct, dose-related toxic effect on oligodendrocytes.
- HCP exposure alters the production of myelin proteins, stimulating MBP and CNPase while inhibiting GalC.
- These findings provide insights into the cellular mechanisms underlying HCP-induced neurotoxicity and myelin damage.
