Protein extravasation and cellular uptake after high-dose human-albumin treatment of transient focal cerebral ischemia in rats.

Treatment with human albumin administered intravenously in the immediate post-ischemic period following a 2-h period of transient focal cerebral ischemia leads to a reduction of cortical infarction in rat. Immunohistochemistry with antibodies to rat immunoglobulins (IgG), rat albumin and (exogenous) human albumin was used to study blood-brain barrier changes. The degree of IgG extravasation was not changed by human-albumin treatment. Diffuse signals and uptake into necrotic neurons was seen in cortex of saline animals. In animals treated with human albumin, cortical neurons with preserved structural features had taken up human albumin. Treatment with human albumin may provide direct neuronal protection.