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Secretion of a mammalian chondroitinase ABC aids glial integration at PNS/CNS boundaries

Research output: Contribution to journalArticle

Philippa Warren, Melissa Andrews, Marc Smith, Katalin Bartus, Elizabeth Bradbury, Joost Verhaagen, James Fawcett, Jessica Kwok

Original languageEnglish
Article number11262
JournalNature Scientific Reports
Volume10
Issue number1
Early online date9 Jul 2020
DOIs
Accepted/In press27 Jun 2020
E-pub ahead of print9 Jul 2020

King's Authors

Abstract

Schwann cell grafts support axonal growth following spinal cord injury, but a boundary forms between the implanted cells and host astrocytes. Axons are reluctant to exit the graft tissue in large part due to the surrounding inhibitory environment containing chondroitin sulphate proteoglycans (CSPGs). We use a lentiviral chondroitinase ABC, capable of being secreted from mammalian cells (mChABC), to examine the repercussions of CSPG digestion upon Schwann cell behaviour in vitro. We show that mChABC transduced Schwann cells robustly secrete substantial quantities of the enzyme causing large-scale CSPG digestion, facilitating the migration and adhesion of Schwann cells on inhibitory aggrecan and astrocytic substrates. Importantly, we show that secretion of the engineered enzyme can aid the intermingling of cells at the Schwann cell-astrocyte boundary, enabling growth of neurites over the putative graft/host interface. These data were echoed in vivo. This study demonstrates the profound effect of the enzyme on cellular motility, growth and migration. This provides a cellular mechanism for mChABC induced functional and behavioural recovery shown in in vivo studies. Importantly, we provide in vitro evidence that mChABC gene therapy is equally or more effective at producing these effects as a one-time application of commercially available ChABC.

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