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Updated: Aug 19, 2026
In Vitro Phagocytosis of Myelin Debris by Bone Marrow-Derived Macrophages
Published on: December 30, 2017
Determination of the sequential degradation of myelin proteins by macrophages
Annette van der Goes1, Wiebe Boorsma, Karin Hoekstra
1Department of Molecular Cell Biology and Immunology, VU University Medical Center, P.O. Box 7057, 1007 MB Amsterdam, The Netherlands.
Abstract:
Demonstration of different myelin proteins (myelin basic protein [MBP], proteolipid protein [PLP] and myelin oligodendrocyte glycoprotein [MOG]) is used as a tool to determine the stage of MS lesions in autopsy tissue. Since such tissue can never be obtained at well-defined stages of lesion formation, the time course of myelin degradation in MS lesions can only be estimated. In order to obtain a more precise indication on the sequence of events of myelin degradation in MS lesions, the breakdown of human myelin by human monocytes was studied in vitro. Human monocytes were fed with myelin; next cytocentrifuge preparations were made on several time points (day 0 until day 6). The cytospots were immunocytochemically stained with mono- and polyclonal antibodies directed against various myelin proteins (MOG, MBP, PLP). We found that MOG is degraded after 1 day, whereas PLP and MBP can be detected for a longer period, 2 and 3 days, respectively. The exact time frame of myelin degradation in our in vitro assay cannot be extrapolated to the MS lesion formation in vivo, but our data allow conclusions on the sequence of events as well as a rough indication of the time frame of myelin degradation by macrophages in MS lesions.
Insights
Myelin oligodendrocyte glycoprotein (MOG) degrades within one day, while myelin basic protein (MBP) and proteolipid protein (PLP) persist longer in vitro. This study reveals the sequence of myelin protein breakdown by monocytes in multiple sclerosis lesions.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Autopsy tissue limits understanding of multiple sclerosis (MS) lesion development.
- Myelin protein degradation timing in MS lesions remains unclear.
Purpose of the Study:
- To investigate the in vitro degradation sequence of myelin proteins by human monocytes.
- To provide a more precise timeline for myelin breakdown in MS lesions.
Main Methods:
- Human monocytes were incubated with human myelin.
- Cytospot preparations were analyzed immunocytochemically at multiple time points (0-6 days).
- Antibodies against myelin oligodendrocyte glycoprotein (MOG), myelin basic protein (MBP), and proteolipid protein (PLP) were used.
Main Results:
- Myelin oligodendrocyte glycoprotein (MOG) was degraded within 1 day.
- Proteolipid protein (PLP) and myelin basic protein (MBP) were detected for up to 2 and 3 days, respectively.
- A distinct sequence of myelin protein degradation was observed.
Conclusions:
- Monocyte-mediated myelin degradation in vitro follows a specific protein sequence.
- The findings offer insights into the timeline of myelin breakdown by macrophages in MS lesions.
- While not directly extrapolating to in vivo conditions, the study clarifies the sequence of myelin degradation events.
