Heikki Savolainen, Prof. Dept. of Occup. Safety & Hlth., POB 536, FIN-33101 Tampere, Finland
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Re: BBB in toxicology
heikki.savolainen{at}stm.fi Heikki Savolainen
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Dear Editor,
This investigation offers an excellent method to study
blood-brain barrier (BBB). The transporters can also malfunction. L-
lactate is an energy source for brain and therefore taken up by the
monocarboxylate transporter (MCT). However, the MCT does not differentiate
between D- and L-isomers. D-Lactate is only slowly metabolized so that it is
toxic even at modest concentrations.
The BBB can also be saturated at high doses of toxicants. Lead at
blood levels higher than 1 mg/l enters the cerebrospinal spaces more
readily (1) resembling that in infants and children with immature BBB
functions.
1 Savolainen H, Kilpiö J. Brain and blood lead in acute intoxication.
Scand j Work Environ Hlth 1977; 3: 104-7 |