Neuroprotective effect of the surfactant poloxamer 188 in a model of intracranial hemorrhage in rats.

Abstract:

OBJECT:Neuronal injury remains a leading cause of morbidity in both neonates and adults with injuries induced by intracranial hemorrhage, ischemia-reperfusion, and excitotoxicity. To date, a number of neuroprotective strategies have been evaluated, but they have shown little benefit. Poloxamer 188 (P-188), a membrane-active triblock copolymer, has been studied extensively as a cell-membrane sealant. The authors used an animal model to study the neuroprotectant effects of P-188 administered by intracisternal (IC) injection after experimentally induced intraparenchymal hemorrhage. METHODS:Sprague-Dawley rats received an IC injection of either P-188 or vehicle (artificial cerebrospinal fluid) 10 minutes after striatal infusion of 50 microl of autologous blood. Animals from both treatment groups were killed either 2 or 7 days later. In a second experiment, after striatal blood infusion and early IC injection of either P-188 or vehicle, animals received daily IC injections of either P- 188 or vehicle for 5 days, and were killed 7 days after induction of the experimental hemorrhage. Striatal tissues were histologically analyzed for neuronal loss, and lesion volumes were determined. Lesion volumes in the animals that received a single dose of P-188 were significantly smaller (mean+/-standard deviation 18.3+/-4.3 mm(3), six rats; p = 0.04) than those in the control group (31.4+/-4.3 mm(3), seven rats) when measured 2 days postinjection; however, no difference in lesion volumes was present 7 days postinjection. Lesion volumes in the animals who received 5 days of daily P-188 injections were significantly smaller (1.50+/-0.58 mm(3), 10 rats; p = 0.04) than those in the corresponding control group (5.04+/-1.85 mm(3), eight rats) when measured at 7 days. CONCLUSIONS:A single dose of P- 188 protects against early neuronal loss after hemorrhage but has no effect on long-term hemorrhage-induced neuronal loss. However, repeated daily P-188 treatment appears to produce effective long-term neuronal protection.

journal_name

J Neurosurg

journal_title

Journal of neurosurgery

authors

Cadichon SB,Le Hoang M,Wright DA,Curry DJ,Kang U,Frim DM

doi

10.3171/ped.2007.106.1.36

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

36-40

issue

1 Suppl

eissn

0022-3085

issn

1933-0693

journal_volume

106

pub_type

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