Normal intrathecal leukocyte cell number and composition do not decrease the incidence of post-lumbar puncture...

Area of Science:

• Neuroimmunology
• Gastroenterology
• Pharmacology

Background:

• The exact cause of post-lumbar puncture headache (PLPH) remains unknown.
• Cerebrospinal fluid (CSF) cells may play a role in repairing dural CSF leaks.
• Crohn's disease patients often have altered immune profiles and may be susceptible to PLPH.

Purpose of the Study:

• To examine the impact of PF-00547659, an anti-MAdCAM-1 antibody, on central nervous system (CNS) immune cells in patients with Crohn's disease.
• To determine if modulating CSF immune cell populations affects the incidence of PLPH.

Main Methods:

• An 8-week induction therapy with high-dose PF-00547659 was administered to patients with active Crohn's disease.
• CSF samples were analyzed for leukocyte counts and lymphocyte subsets (CD3+, CD4+, CD8+ T cells) before and after therapy.
• PLPH incidence was recorded after lumbar punctures performed under two protocols.

Main Results:

• The incidence of PLPH was 35% after the first lumbar puncture and 26% after the second.
• PF-00547659 therapy resulted in a minor, non-significant increase in overall CSF leukocytes and specific lymphocyte subsets.
• The composition of lymphocytes in the CSF remained unchanged by the anti-MAdCAM-1 treatment.

Conclusions:

• Modulating CSF leukocyte numbers and composition with PF-00547659 did not alter the incidence of PLPH.
• These findings suggest that normal intrathecal leukocyte levels and composition are insufficient to prevent PLPH.
• Further research is needed to elucidate the pathogenesis of PLPH and identify potential preventative strategies.