Changes of local cerebral blood flow concomitant to lead-exposure in adult rabbits.
Lead is considered a pathogenic factor of atherosclerosis and arterial hypertension, which are main risk factors of cerebrovascular disease. The brain microvasculature preferentially accumulates lead and its function is sensitive to its toxic effect. Influence of inorganic lead-exposure (20 mg/kg-I group, 40 mg/kg II group) for 10 days on local cerebral blood flow (lCBF) in hypothalamus (HYP) and cerebral cortex (CTX) of rabbits was studied by means of the hydrogen clearance method. Corresponding results were compared to sham operated group (III group). During lead-exposure lCBF was reduced in both investigated regions. The reduction of lCBF in HYP was reduced in both investigated regions. The reduction of lCBF in HYP was 12.9% (P < 0.05) in I and 19.9% (P < 0.001) in II group; corresponding changes in CTX were -16.9% (statistically non-significant -N) in I and 1.4% (NS) in II group. Present finding suggest that inorganic lead induces cerebral microvascular dysfunction with following changes in lCBF. These alteration have a biphasic character Although these disturbances reveal a tendency towards normalization, it is possible to presume that higher concentrations of ingested lead cause more severe injury to endothelium of brain microvasculature.
Linnamägi
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U
Department of Neurology and Neurosurgery, University of Tartu, Estonia.
Kaasik
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AE
D000818:Animals; D002545:Brain Ischemia / Q000209:etiology / Q000503:physiopathology; D002540:Cerebral Cortex / Q000098:blood supply* / Q000503:physiopathology; D007031:Hypothalamus / Q000098:blood supply* / Q000503:physiopathology; D007855:Lead Poisoning / Q000150:complications; D011817:Rabbits; D012039:Regional Blood Flow