Greater disturbance of water and ion homeostasis in the periphery of experimental focal cerebral ischemia.
Differences in disturbed water and ion homeostasis in the periphery and the center of focal cerebral ischemia were investigated. Focal cerebral ischemia was induced by occlusion of the right common carotid artery in gerbils. Water and electrolyte content were determined using punched-out samples. In 2 h of ischemia, water content of the cerebral cortex was 79.0 +/- 0.3, 82.0 +/- 0.4, and 80.7 +/- 0.4% (means +/- SE) for the nonischemic region, the periphery, and the center of the ischemic region, respectively (significantly different). Na+ content was increased and K+ content was decreased most prominently in the periphery of the ischemic region. K+ depletion and exogenous Ca2+ accumulation in the peripheral region were visualized by K+ staining and 45Ca autoradiography, respectively. Thus, water and electrolyte changes in the periphery of ischemia were different from those in the center. Brain edema was developed initially in the marginal region of the focal cerebral ischemia.
D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D001345:Autoradiography; D001929:Brain Edema / Q000209:etiology / Q000378:metabolism*; D002118:Calcium / Q000378:metabolism*; D005260:Female; D005849:Gerbillinae; D006651:Histocytochemistry; D002546:Ischemic Attack, Transient / Q000150:complications / Q000378:metabolism*; D008297:Male; D009243:NAD / Q000378:metabolism; D011188:Potassium / Q000378:metabolism*; D014883:Water-Electrolyte Imbalance / Q000209:etiology / Q000378:metabolism*
D009243:NAD; D000255:Adenosine Triphosphate; D011188:Potassium; D002118:Calcium