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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 대한약학회 Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea 제28권 제4호
- 발행연도
- 2005.1
- 수록면
- 443 - 450 (8page)
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초록· 키워드
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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 $[^3{H}]choline$ in TR-BBB cells increased time-dependently. The initial uptake rate of $[^3{H}]choline$ was concentration-dependent with a Michaelis-Menten value, $K_{m}$, of $26.2\pm2.7{\mu}M$. The $[^3{H}]choline$ uptake into TR-BBB was $Na^{+}-independent$, but was membrane potential-dependent. The $[^3{H}]choline$ uptake was susceptible to inhibition by hemicholinium-3, and tetraethy-lammonium (TEA), which are organic cation transporter substrates. Also, the uptake of $[^3{H}]choline$ was competitively inhibited with $K_{i}$ values of $274 {\mu}M, 251 {\mu}M and 180 {\mu}M$ 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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