Chondroitinase activity can be transduced by a lentiviral vector in vitro and in vivo.

Abstract

The bacterial enzyme chondroitinase ABC (ChABC), which cleaves chondroitin sulfate glycosaminoglycan chains, can degrade inhibitory scar tissue formed following spinal cord injury, thereby promoting axonal growth and regeneration. However, delivering the active enzyme for prolonged periods presents practical limitations. To overcome these problems, we prepared a lentiviral vector (LV) encoding chondroitinase AC (Chase) together with the green fluorescent protein (GFP) reporter (Chase/LV) and demonstrated its expression and enzymatic activity in vitro and in vivo. Neural precursor cells infected with Chase/LV expressed the GFP reporter at levels that increased dramatically with time in culture. Enzymatic activity from the supernatant of the infected cells was demonstrated by dot blot assay using an antibody that recognizes the digested form of CSPG and was compared with the bacterial ChABC enzyme. Chick DRG cultures plated adjacent to the CSPG border and incubated with supernatant from Chase/LV-infected cells showed neurites growing into the CSPG area, a response similar to that after treatment with ChABC. In contrast, in control cultures, the neurites turned to avoid the inhibitory CSPG interface. Degradation of CSPG in these cultures was confirmed by specific CSPG antibodies. A single injection of Chase/LV into the spinal cord resulted in sustained secretion of the enzyme, whose activity was detected for 8 weeks by expression of GFP and evidence of the digested form of CSPG. This study demonstrates the efficacy of the Chase/LV vector and its potential as a therapeutic tool to reduce scar inhibition and promote axonal growth and repair following central nervous system injury.

• Authors: Ying Jin, Andrea Ketschek, Zhilong Jiang, George Smith, Itzhak Fischer
• Journal: Journal of neuroscience methods (J Neurosci Methods) Vol. 199 Issue 2 Pg. 208-13 (Aug 15 2011) ISSN: 1872-678X [Electronic] Netherlands
• PMID: 21600922 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2011 Elsevier B.V. All rights reserved.

Chemical References

• Chondroitin Lyases

Topics

• Animals
• Axons (enzymology, physiology)
• Cells, Cultured
• Chick Embryo
• Chondroitin Lyases (genetics, metabolism)
• Female
• Genetic Vectors (genetics, physiology)
• Lentivirus (genetics)
• Rats
• Rats, Inbred F344
• Rats, Sprague-Dawley
• Rats, Transgenic
• Transduction, Genetic (methods)