Full-Length and Fragmented Netrin-1 in Multiple Sclerosis Plaques Are Inhibitors of Oligodendrocyte Precursor Cell Migration

• Published in: The American journal of pathology Vol. 183; no. 3; pp. 673 - 680
• Main Authors: Bin, Jenea M, Rajasekharan, Sathyanath, Kuhlmann, Tanja, Hanes, Ilana, Marcal, Nathalie, Han, Dong, Rodrigues, Sonia P, Leong, Soo Yuen, Newcombe, Jia, Antel, Jack P, Kennedy, Timothy E
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.09.2013
• Subjects: Adult; Aged; Animals; Brain - metabolism; Brain - pathology; Cell Movement; Chickens; Child; Female; HEK293 Cells; Humans; Male; Middle Aged; Multiple Sclerosis - metabolism; Multiple Sclerosis - pathology; Nerve Growth Factors - chemistry; Nerve Growth Factors - metabolism; Netrin-1; Oligodendroglia - metabolism; Oligodendroglia - pathology; Pathology; Peptide Fragments - chemistry; Peptide Fragments - metabolism; Protein Structure, Tertiary; Rats; Rats, Sprague-Dawley; Stem Cells - metabolism; Stem Cells - pathology; Tumor Suppressor Proteins - chemistry; Tumor Suppressor Proteins - metabolism
• ISSN: 0002-9440; 1525-2191
• DOI: 10.1016/j.ajpath.2013.06.004

Oligodendrocytes exhibit a limited capacity to remyelinate in multiple sclerosis. Factors present in multiple sclerosis lesions are thought to inhibit oligodendrocyte precursor cell migration, limiting their recruitment to axons requiring remyelination; however, few inhibitors have been identified. A candidate inhibitor is netrin-1, a secreted protein that repels migrating oligodendrocyte precursor cells during neural development and is expressed by myelinating oligodendrocytes in the mature rodent central nervous system. Herein, we examined the distribution of netrin-1 in adult human white matter and multiple sclerosis lesions. We detected full-length netrin-1 protein and shorter netrin-1 fragments in samples of normal white matter and of multiple sclerosis lesions from adult human brain. We demonstrate that peptides corresponding to amino terminal domains VI and V of netrin-1 repel migrating oligodendrocyte precursor cells, but lack the chemoattractant activity of full-length netrin-1. Furthermore, recombinant domains VI-V of netrin-1 disrupt the chemoattractant activity of full-length netrin-1, consistent with a competitive mechanism of action. These findings indicate that full-length and fragmented forms of netrin-1, found in multiple sclerosis lesions, have the capacity to inhibit oligodendrocyte precursor migration, identifying netrin-1 as a potential target for therapies that promote remyelination.