Jeanne-Marie Lefauconnier

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Studies of drug distribution to brain should be controlled for the experimental method used. Numerous methods have been employed to ascertain brain distribution and many of these approaches use anesthetic agents. The in situ rat brain perfusion method is one of the most sensitive and widely used methods for evaluating brain distribution profiles. There has(More)
Transport of a polyamine (PA), spermidine (SPMD) into rat brain at various early postischemic periods was studied. Rats underwent 20 min of four-vessel occlusion (4VO) followed by 5, 10, 30 and 60 min of recirculation (RC) periods with natural brain temperature. 3H-aminoisobutyricacid (AIB) and 14C-SPMD were utilised to search dual functions of the(More)
Lead levels in the nervous system of rats intoxicated for 8 months by lead acetate (0.2% in drinking water) varied according to the region: the lowest levels were observed in sciatic nerve and the highest in hippocampus and cerebral neocortex, while intermediate levels were observed in pons medulla, cerebellum, midbrain, hypothalamus and striatum.
Brain capillaries isolated from 2-month-old male and female Sprague-Dawley rats were used to study the transport of neutral amino acids. The uptake of alanine, leucine, and alpha-methylaminoisobutyric acid (MeAIB) was a linear function of time for the first minute of incubation. Based on these observations, an incubation time of 1 min was used to measure(More)
Taurine transport into six brain regions of equithesin-anesthetized rats was studied by the in situ brain perfusion technique. This technique gives both accurate measurements of cerebrovascular amino acid transport and allows complete control of the perfusate amino acid composition. Final wash procedure showed that taurine efflux occurred rapidly from(More)
Lipid synthesis and its regulation by serum lipoproteins at the microvascular blood-brain barrier were studied using primary cultures of microvascular endothelial cells from rat brain. These cells are capable of synthesizing all their lipids (neutral lipids, phospholipids, glycolipids) from the water-soluble compounds, glucose, acetate, acetoacetate and(More)
Classically, drug penetration through the blood-brain barrier depends on the lipid solubility of the substance, except for some highly lipophilic drugs, like colchicine and vinblastine, both substrates of P-glycoprotein, a drug efflux pump present at the luminal surface of the brain capillary endothelial cells. Colchicine and vinblastine uptake into the(More)
The content of polyunsaturated fatty acids, the activities of superoxide dismutase (SOD), glutathione peroxidase, glutathione reductase, and catalase, and the concentration of reduced glutathione were measured in cerebral microvessels isolated from rat brain. Polyunsaturated fatty acids, mainly arachidonic, linoleic, and docosahexaenoic acids, accounted for(More)
We report the application of multiple time regression analysis with the in situ brain perfusion technique to measure the rates of passage between blood and brain for [14C] L-proline, [14C] L-alanine, and [14C] alpha-aminoisobutyric acid (AIB) and their rapidly reversible volumes following perfusion of these amino acids from 10 to 60 seconds. We also report(More)