Article: Donepezil, tacrine and alpha-phenyl-n-tert-butyl nitrone (PBN) inhibit choline transport by conditionally immortalized rat brain capillary endothelial cell lines (TR-BBB).
Archives of pharmacal research
2005 Volume 28, Issue 4, Page(s) 443–450
Abstract: ... hydrochloride, tacrine and alpha-phenyl-n-tert-butyl nitrone (PBN), respectively. These characteristics ... In the present study, we have characterized the choline transport system and examined the influence ... of various amine drugs on the choline transporter using a conditionally immortalized rat brain ...
Abstract | In the present study, we have characterized the choline transport system and examined the influence of various amine drugs on the choline transporter using a conditionally immortalized rat brain capillary endothelial cell line (TR-BBB) in vitro. The cell-to-medium (C/M) ratio of [3H]choline in TR-BBB cells increased time-dependently. The initial uptake rate of [3H]choline was concentration-dependent with a Michaelis-Menten value, Km, of 26.2 +/- 2.7 microM. The [3H]choline uptake into TR-BBB was Na+-independent, but was membrane potential-dependent. The [3H]choline uptake was susceptible to inhibition by hemicholinium-3, and tetraethylammonium (TEA), which are organic cation transporter substrates. Also, the uptake of [3H]choline was competitively inhibited with Ki values of 274 microM, 251 microM and 180 microM in the presence of donepezil hydrochloride, tacrine and alpha-phenyl-n-tert-butyl nitrone (PBN), respectively. These characteristics of choline transport are consistent with those of the organic cation transporter (OCT). OCT2 mRNA was expressed in TR-BBB cells, while the expression of OCT3 or choline transporter (CHT) was not detected. Accordingly, these results suggest that OCT2 is a candidate for choline transport at the BBB and may influence the BBB permeability of amine drugs. |
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MeSH term(s) | Animals ; Biological Transport/drug effects ; Blood-Brain Barrier/drug effects ; Blood-Brain Barrier/metabolism ; Brain/blood supply ; Brain/cytology ; Brain/metabolism ; Cell Line, Transformed ; Central Nervous System Agents/pharmacology ; Choline/metabolism ; Cyclic N-Oxides ; Donepezil ; Endothelial Cells/drug effects ; Endothelial Cells/metabolism ; Indans/pharmacology ; Models, Biological ; Nerve Tissue Proteins/biosynthesis ; Nitrogen Oxides/pharmacology ; Organic Cation Transport Proteins/biosynthesis ; Piperidines/pharmacology ; Plasma Membrane Neurotransmitter Transport Proteins ; Rats ; Symporters/biosynthesis ; Tacrine/pharmacology |
Chemical Substances | Central Nervous System Agents ; Cyclic N-Oxides ; Indans ; Nerve Tissue Proteins ; Nitrogen Oxides ; Organic Cation Transport Proteins ; Piperidines ; Plasma Membrane Neurotransmitter Transport Proteins ; Symporters ; Slc6a8 protein, rat (147652-48-0) ; phenyl-N-tert-butylnitrone (3I91332OPG) ; Tacrine (4VX7YNB537) ; Donepezil (8SSC91326P) ; Choline (N91BDP6H0X) |
Language | English |
Publishing date | 2005-05-11 |
Publishing country | Korea (South) |
Document type | Journal Article ; Research Support, Non-U.S. Gov't |
ZDB-ID | 447623-2 |
ISSN | 1976-3786 ; 0253-6269 |
ISSN (online) | 1976-3786 |
ISSN | 0253-6269 |
DOI | 10.1007/bf02977674 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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