title: Transient lysosomal activation is essential for p75 nerve growth factor receptor expression in myelinated Schwann cells during Wallerian degeneration.
abstract: Myelinated Schwann cells in the peripheral nervous system express the p75 nerve growth factor receptor (p75NGFR) as a consequence of Schwann cell dedifferentiation during Wallerian degeneration. p75NGFR has been implicated in the remyelination of regenerating nerves. Although many studies have shown various mechanisms underlying Schwann cell dedifferentiation, the molecular mechanism contributing to the re-expression of p75NGFR in differentiated Schwann cells is largely unknown. In the present study, we found that lysosomes were transiently activated in Schwann cells after nerve injury and that the inhibition of lysosomal activation by chloroquine or lysosomal acidification inhibitors prevented p75NGFR expression at the mRNA transcriptional level in an ex vivo Wallerian degeneration model. Lysosomal acidification inhibitors suppressed demyelination, but not axonal degeneration, thereby suggesting that demyelination mediated by lysosomes may be an important signal for inducing p75NGFR expression. Tumor necrosis factor-α (TNF-α) has been suggested to be involved in regulating p75NGFR expression in Schwann cells. In this study, we found that removing TNF-α in vivo did not significantly suppress the induction of both lysosomes and p75NGFR. Thus, these findings suggest that lysosomal activation is tightly correlated with the induction of p75NGFR in demyelinating Schwann cells during Wallerian degeneration.
authors.affiliation: Department of Physiology, Mitochondria Hub Research Center, College of Medicine, Dong-A University, Busan, Korea.
authors.forename: Junyang
authors.initials: J
authors.lastname: Jung
authors.forename: Wenting
authors.initials: W
authors.lastname: Cai
authors.forename: So Young
authors.initials: SY
authors.lastname: Jang
authors.forename: Yoon Kyoung
authors.initials: YK
authors.lastname: Shin
authors.forename: Duk Joon
authors.initials: DJ
authors.lastname: Suh
authors.forename: Jong Kuk
authors.initials: JK
authors.lastname: Kim
authors.forename: Hwan Tae
authors.initials: HT
authors.lastname: Park