Previous studies have demonstrated depressive or hibernation-like roles of
phenothiazine neuroleptics [combined
chlorpromazine and
promethazine (C + P)] in brain activity. This
ischemic stroke study aimed to establish neuroprotection by reducing oxidative stress and improving brain metabolism with post-ischemic C + P administration. Sprague-Dawley rats were subjected to transient (2 or 4 h)
middle cerebral artery occlusion (MCAO) followed by 6 or 24 h reperfusion, or permanent (28 h) MCAO without reperfusion. At 2 h after
ischemia onset, rats received either an intraperitoneal (IP) injection of saline or two doses of C + P. Body temperatures,
brain infarct volumes, and neurological deficits were examined. Oxidative metabolism and stress were determined by levels of
ATP,
NADH, and
reactive oxygen species (ROS).
Protein kinase C-δ (PKC-δ) and Akt expression were determined by Western blotting. C + P administration induced a neuroprotection in both transient and permanent
ischemia models evidenced by significant reduction in
infarct volumes and neurological deficits post-
stroke. C + P induced a dose-dependent reduction in body temperature as early as 5 min post-
ischemia and lasted up to 12 h. However, reduction in body temperature either only slightly or did not enhance C + P-induced neuroprotection. C + P
therapy improved brain metabolism as determined by increased
ATP levels and
NADH activity, as well as decreased ROS production. These
therapeutic effects were associated with alterations in PKC-δ and Akt
protein expression. C + P treatments conferred neuroprotection in severe
stroke models by suppressing the damaging cascade of metabolic events, most likely independent of drug-
induced hypothermia. These findings further prove the clinical potential for C + P treatment and may direct us closer towards the development of an efficacious neuroprotective
therapy.