title: Role of two efflux proteins, ABCB1 and ABCG2 in blood-brain barrier transport of bromocriptine in a murine model of MPTP-induced dopaminergic degeneration.
abstract: OBJECTIVE
  MPTP-induced dopaminergic degeneration is an experimental model commonly used to explore Parkinson's disease. Cerebral drug transport by ABC transporters in MPTP models has never been reported.
  
  
  METHODS
  We have investigated the transport of bromocriptine through the blood-brain barrier (BBB) in a MPTP model to understand the influence of the dopaminergic degeneration on ABCB1 and ABCG2.
  
  
  RESULTS
  We have shown that in MPTP treated mice, bromocriptine is widely distributed to brain (2.3-fold versus control, p less than 0.001) suggesting either disruption of BBB or alteration of active efflux of the drug. In situ brain perfusion of [14C]- sucrose and [3H]-inulin did not evidenced a BBB disruption. Studies of ABCB1 and ABCG2 activity showed that MPTP intoxication did not alter their functionality. Conversely, ABCG2 expression studied on brain capillaries from MPTP-treated mice was decreased (1.3-fold, p less than 0.05) and ABCB1 expression increased (1.43-fold, p less than 0.05) as an off-setting of brain transport.
  
  
  CONCLUSIONS
  These data demonstrate that MPTP intoxication does not alter the BBB permeability. However, bromocriptine brain distribution is increased in MPTP animals. Hence, MPTP may interact with another transport mechanism such as uptake and/or other efflux transporters. Inflammation and Parkinson's-like lesions induced by MPTP intoxication could lead to modification of drug pharmacokinetics and have clinical consequences, such as neurotoxicity.
authors.affiliation: Department of Clinical Pharmacy EA 2706, University Paris Sud XI, Chatenay-Malabry, France. sarahvautier@hotmail.com
authors.forename: Sarah
authors.initials: S
authors.lastname: Vautier
authors.forename: Aline
authors.initials: A
authors.lastname: Milane
authors.forename: Christine
authors.initials: C
authors.lastname: Fernandez
authors.forename: Helene
authors.initials: H
authors.lastname: Chacun
authors.forename: Lucette
authors.initials: L
authors.lastname: Lacomblez
authors.forename: Robert
authors.initials: R
authors.lastname: Farinotti
mesh_terms: D015632:1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine; D018435:ATP Binding Cassette Transporter, Subfamily B; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000070997:ATP Binding Cassette Transporter, Subfamily G, Member 2; D018528:ATP-Binding Cassette Transporters / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D000978:Antiparkinson Agents / Q000493:pharmacokinetics*; D001692:Biological Transport; D001812:Blood-Brain Barrier / Q000378:metabolism; D015153:Blotting, Western; D001921:Brain / Q000378:metabolism; D001971:Bromocriptine / Q000493:pharmacokinetics*; D004195:Disease Models, Animal; D005786:Gene Expression Regulation; D007274:Injections, Intraperitoneal; D020267:MPTP Poisoning / Q000503:physiopathology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D010300:Parkinson Disease / Q000188:drug therapy / Q000503:physiopathology; D014018:Tissue Distribution
chemical_list: D018435:ATP Binding Cassette Transporter, Subfamily B; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000070997:ATP Binding Cassette Transporter, Subfamily G, Member 2; D018528:ATP-Binding Cassette Transporters; C501412:Abcg2 protein, mouse; D000978:Antiparkinson Agents; D001971:Bromocriptine; D015632:1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine; C507084:Abcb1b protein, mouse