Development of a simple, rapid, and robust intrathecal catheterization method in the rat

Area of Science:

• Neuroscience
• Pharmacology
• Surgical Techniques

Background:

• The blood brain barrier (BBB) restricts the delivery of large, charged molecules like antisense oligonucleotides (ASOs) to the central nervous system (CNS).
• Developing effective CNS therapeutics is hindered by the BBB's impermeability to many potential drug candidates.
• Direct administration into the CNS is a strategy to overcome BBB limitations for molecules like ASOs.

Purpose of the Study:

• To develop a rapid, simple, and robust method for intrathecal catheterization in rats.
• To facilitate the pre-clinical testing of antisense oligonucleotides (ASOs) as potential CNS therapeutics.
• To provide a reliable technique for circumventing the blood brain barrier (BBB) for drug delivery studies.

Main Methods:

• A lumbar approach for intrathecal catheterization in rats was developed using readily available materials.
• The technique employs 23-gauge needles, 19-gauge guide cannulas, and PE-10 catheters, with the catheter placed in the cauda equina space.
• This method minimizes spinal cord compression, unlike cisterna magna approaches.

Main Results:

• The method achieves over 90% success rate for catheterization.
• Up to 100 rats can be catheterized and administered test substances within a 6-hour period.
• This technique has enabled the pre-clinical testing of hundreds of ASOs for CNS indications.

Conclusions:

• The developed intrathecal catheterization method is effective, efficient, and easily learned.
• It provides a valuable tool for the pre-clinical assessment of ASOs and other non-BBB penetrant molecules as CNS therapeutics.
• This technique significantly advances the study of potential treatments for CNS diseases and injuries.