Neuroprotective properties of aptiganel HCL (Cerestat) following controlled cortical impact injury

Recent studies revealed a neuroprotective effect of the non-competitive NMDA Receptor Antagonist Aptiganel HCL (Cerestat CNS 1102) in focal cerebral ischemia. This study investigates the influence of Cerestat on contusion volume, post-traumatic brain edema and intracranial pressure (ICP) following Controlled Cortical Impact Injury (CCII). In rats (n = 54) CCII was applied to the left hemisphere using a pneumatic impactor. Cerestat (2 mg/kg i.v.) or vehicle was injected 15 min after injury Animals were sacrificed 24 hours later. Contusion volume was measured planimetrically (n = 18). Hemispheric swelling and water content were determined gravimetrically (n = 20). ICP, mean arterial blood pressure (MABP) and cerebral perfusion pressure (CPP) were monitored for 30 min before sacrifice (n = 16). Cerestat reduced contusion volume from 77.3 +/- 5.8 mm3 to 66.8 +/- 3.9 mm3 (p < 0.05). Hemispheric swelling was also diminished from 11.1 +/- 0.8% to 8.2 +/- 1.4% as soon was water content (Cerestat 82.30 +/- 0.18% vs. control: 82.78 +/- 0.12%, p < 0.05). ICP was decreased by treatment from 31.7 +/- 3.5 mm Hg to 26.3 +/- 2.2 mm Hg and CPP was significantly improved (82.1 +/- 4.4 mm Hg vs 57.7 +/- 4.8 mm Hg; p < 0.05) 24 hours after injury. Cerestat administration was associated with decrease contusion volume, less hemispheric swelling, a lower ICP and increased CPP.