CNS Clinical Research is a Vast and Growing Segment

A recent report by PhRMA on US pharmaceutical research companies that were developing new medicines to treat debilitating neurological disorders documented that there were over 500 new compounds in the research pipelines.  Neurological disorders such as Alzheimer’s, epilepsy, multiple sclerosis, Parkinson’s, and stroke were the targets for the many research programs.

The medicines in development (either in human clinical trials or at the Food and Drug Administration awaiting approval) included:

  • 171 medicines for pain
  • 82 medicines for Alzheimer’s disease
  • 58 medicines for brain tumors
  • 46 medicines for multiple sclerosis
  • 30 medicines for Parkinson’s disease
  • 29 medicines for migraine
  • 26 medicines for epilepsy
  • 23 medicines for stroke

Other medicines in development targeted brain injuries, Huntington’s disease, ALS, spinal cord injury, myasthenia gravis, juvenile cerebral palsy, and restless legs syndrome.  The majority of the promising new drugs in development work by new and complex mechanisms which require demonstration (“proof of concept”) that the drug will behave in humans the same as it did during the experiments in animals.

Since treatment of many on these neurological disorders requires that the drug penetrates the Central Nervous System (brain and spinal cord) in order to be effective, early clinical trials may require that Cerebral Spinal Fluid (CSF) is sampled.  This delicate procedure is needed in order to demonstrate that the drug crosses the blood-brain-barrier or that specific chemical constituents of the CSF (biomarkers) are modified as the dose of the new drug is increased.

WCCT Global has many years of experience in the collection of CSF as a unique study or during the first-in-man single or multiple dose studies.  WCCT Global has carried out trials where only one or two lumbar punctures with single CSF sampling were required, as well as trials that required up to 48 hours of serial CSF collection at multiple time points.  We work with board-certified anesthesiologists and provide highly trained nursing and medical support throughout the entire study.  Sample processing, storage and shipment for analysis can be tailored to the unique requirements of each biomarker and are conducted in a strict GCP environment.

WCCT Global’s on-site treatment room provides a spacious, sterile environment for these critical study procedures, thereby sparing patients and clients the unnecessary scheduling difficulties of a hospital setting.  Should a sponsor or particular study protocol require it, WCCT’s anesthesiologists can place the intrathecal catheters utilizing fluoroscopy. During the catherization period and approximately 24 hrs post catheter removal, subjects are required to lie down with limited movement. An example of appropriate activities during this time would include using the restroom and sitting up to eat. This restriction in movement helps to reduce the incidence of spinal headaches and also helps to maintain good catheter placement.

Reasons for Cerebral Spinal Fluid Sampling

  • Proof of CNS penetration
  • CSF PK assessment
  • CSF Biomarker evaluation
  • Blood/CSF Drug/Biomarker PK/PD modeling

WCCT Global has worked closely with sponsors and our IRBs to ensure that subject safety and comfort is paramount and therefore has been able to successfully recruit a variety of volunteers for these trials.  WCCT has recruited healthy young volunteers, healthy elderly volunteers, and healthy Japanese volunteers into a number of trials requiring CSF sampling.

The PK/PD relationship (plasma and CSF) of Arbaclofen, the R-enantiomer of the GABAb agonist, baclofen, has been evaluated at WCCT Global.  It was determined that the SCF penetration of the r-enantiomer (Arbaclofen) of baclofen at clinically relevant plasma concentrations was not associated with sedation.  The ability to document CSF penetration of the active enantiomer and the absence of sedation is a very strong indication that Arbaclofen will not cause sedation during routine use in patients.

Keywords: Description:
clinical development  In drug development, pre-clinical development, also named preclinical studies and nonclinical studies, is a stage of research that begins before clinical trials (testing in humans) can begin, and during which important feasibility, iterative testing and drug safety data is collected.
alzheimer s disease Alzheimer’s disease (AD), also known as Alzheimer disease, or just Alzheimer’s, accounts for 60% to 70% of cases ofdementia.[1][2] It is a chronic neurodegenerative disease that usually starts slowly and gets worse over time.[1][2] The most common early symptom is difficulty in remembering recent events (short-term memory loss).[1] As the disease advances, symptoms can include problems with language, disorientation (including easily getting lost), mood swings, loss of motivation, not managing self care, and behavioural issues.[1][2] As a person’s condition declines, they often withdraw from family and society.
capillary endothelial cell Endothelium is a type of epithelium that lines the interior surface of blood vessels and lymphatic vessels,[1] forming an interface between circulating blood or lymph in the lumen and the rest of the vessel wall. It is a thin layer of simple squamous cells calledendothelial cells.
blood brain barrier  The blood–brain barrier (BBB) is a highly selective permeability barrier that separates the circulating blood from the brainextracellular fluid (BECF) in the central nervous system (CNS). The blood–brain barrier is formed by brain endothelial cells, which are connected by tight junctions with an extremely high electrical resistivity of at least 0.1 Ω⋅m.[1] The blood–brain barrier allows the passage of water, some gases, and lipid-soluble molecules by passive diffusion, as well as the selective transport of molecules such as glucose and amino acids that are crucial to neural function. On the other hand, the blood–brain barrier may prevent the entry of lipophilic, potential neurotoxins by way of an active transport mechanism mediated by P-glycoprotein.
peripheral nervous system  The peripheral nervous system (PNS) is the part of the nervous system that consists of the nerves and ganglia on the outside of the brain and spinal cord.[1] The main function of the PNS is to connect the central nervous system (CNS) to the limbs and organs, essentially serving as a communication relay going back and forth between the brain and the extremities.[2] Unlike the CNS, the PNS is not protected by the bone of spine and skull, or by the blood–brain barrier, which leaves it exposed to toxins and mechanical injuries.