Functional screening for compounds that promote remyelination represents a major hurdle in the development of rational therapeutics for multiple sclerosis. Screening for remyelination is problematic, as myelination requires the presence of axons. Standard methods do not resolve cell-autonomous effects and are not suited for high-throughput formats. Here we describe a binary indicant for myelination using micropillar arrays (BIMA). Engineered with conical dimensions, micropillars permit resolution of the extent and length of membrane wrapping from a single two-dimensional image. Confocal imaging acquired from the base to the tip of the pillars allows for detection of concentric wrapping observed as 'rings' of myelin. The platform is formatted in 96-well plates, amenable to semiautomated random acquisition and automated detection and quantification. Upon screening 1,000 bioactive molecules, we identified a cluster of antimuscarinic compounds that enhance oligodendrocyte differentiation and remyelination. Our findings demonstrate a new high-throughput screening platform for potential regenerative therapeutics in multiple sclerosis.
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We thank the Multiple Sclerosis Research Group at the University of California, San Francisco (UCSF) for support, advice and insightful discussions. This work was supported by the US National Multiple Sclerosis Society Harry Weaver Neuroscience Scholar Award (JF 2142-A2/T), UCSF CTSI Catalyst Award for Innovation, gifts from friends of the Multiple Sclerosis Research Group at UCSF and the Joint Research Fund for Overseas Chinese Young Scholars (NSCF, 31228011). The rabbit monoclonal antibody to PDGFRα was a gift from W.B. Stallcup (Sanford Burnham Medical Research Institute).
The authors declare no competing financial interests.
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Mei, F., Fancy, S., Shen, YA. et al. Micropillar arrays as a high-throughput screening platform for therapeutics in multiple sclerosis. Nat Med 20, 954–960 (2014). https://doi.org/10.1038/nm.3618
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