Collagenase: an experimental study of intervertebral disc dissolution.

Area of Science:

• Biochemistry
• Veterinary Medicine
• Enzymology

Background:

• The nucleus pulposus is a key component of intervertebral discs.
• Degenerative disc disease necessitates novel therapeutic approaches.
• Enzymatic dissolution offers a potential minimally invasive treatment strategy.

Purpose of the Study:

• To evaluate the efficacy of purified collagenase (Nucleolysin) for nucleus pulposus dissolution.
• To assess the local and systemic toxicity of Nucleolysin.
• To determine the safety margin for intrathecal administration.

Main Methods:

• Administration of purified collagenase (Nucleolysin) to nucleus pulposus in dogs and monkeys.
• Histopathological evaluation of surrounding tissues for toxicity.
• LD50 studies in mice and systemic toxicity studies in dogs.
• Antigenicity testing in guinea pigs.

Main Results:

• Consistent dissolution of the nucleus pulposus was observed.
• The enzyme showed safety in surrounding local tissues, except for intrathecal administration.
• A safety margin for intrathecal administration was indicated in monkeys.
• Satisfactory margins of safety were shown in systemic toxicity studies.
• No significant antigenicity was detected in guinea pigs.

Conclusions:

• Purified collagenase (Nucleolysin) is effective in dissolving nucleus pulposus.
• The enzyme exhibits a favorable safety profile for local and systemic administration.
• Further investigation into intrathecal administration safety is warranted.