Spinal cord injuries (SCI), for which there are limited effective treatments, result in enduring paralysis and hypoesthesia, in part because of the inhibitory microenvironment that develops and limits regeneration/sprouting, especially during chronic stages. Recently, we discovered that targeted enzymatic removal of the inhibitory chondroitin sulfate proteoglycan (CSPG) component of the extracellular and perineuronal net (PNN) matrix via Chondroitinase ABC (ChABC) rapidly restored robust respiratory function to the previously paralyzed hemi-diaphragm after remarkably long times post-injury (up to 1.5 years) following a cervical level 2 lateral hemi-transection. Importantly, ChABC treatment at cervical level 4 in this chronic model also elicited improvements in gross upper arm function. In the present study, we focused on arm and hand function, seeking to highlight and optimize crude as well as fine motor control of the forearm and digits at lengthy chronic stages post-injury. However, instead of using ChABC, we utilized a novel and more clinically relevant systemic combinatorial treatment strategy designed to simultaneously reduce and overcome inhibitory CSPGs. Following a 3-month upper cervical spinal hemi-lesion using adult female Sprague Dawley rats, we show that the combined treatment had a profound effect on functional recovery of the chronically paralyzed forelimb and paw, as well as on precision movements of the digits. The regenerative and immune system related events that we describe deepen our basic understanding of the crucial role of CSPG-mediated inhibition via the PTPσ receptor in constraining functional synaptic plasticity at lengthy time points following SCI, hopefully leading to clinically relevant translational benefits.

• Keywords
• CSPGs, axon regeneration, axon sprouting, perineuronal net, receptor PTPσ, spinal cord injury,
• MeSH
• Chondroitin ABC Lyase pharmacology   MeSH
• Chondroitin Sulfate Proteoglycans * pharmacology   MeSH
• Rats MeSH
• Spinal Cord MeSH
• Spinal Cord Injuries * MeSH
• Rats, Sprague-Dawley MeSH
• Forelimb MeSH
• Nerve Regeneration physiology   MeSH
• Receptor-Like Protein Tyrosine Phosphatases, Class 2 MeSH
• Animals MeSH
• Check Tag
• Rats MeSH
• Female MeSH
• Animals MeSH
• Publication type
• Journal Article MeSH
• Research Support, Non-U.S. Gov't MeSH
• Research Support, N.I.H., Extramural MeSH
• Names of Substances
• Chondroitin ABC Lyase MeSH
• Chondroitin Sulfate Proteoglycans * MeSH
• Receptor-Like Protein Tyrosine Phosphatases, Class 2 MeSH