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Involvement of the carrier-mediated process in the retina-to-blood transport of spermine at the inner blood-retinal barrier.

Abstract：

:The elimination of spermine, the end product of cellular polyamine, from the retina to the blood across the blood-retinal barrier (BRB) was investigated. The in vivo microdialysis study revealed that the elimination of [(3)H]spermine from vitreous humor after vitreous bolus injection was in a biexponential manner. The rate constant for the elimination of [(3)H]spermine during the terminal phase was estimated to be 1.67-fold greater than that of [(14)C]d-mannitol, a bulk flow marker, and the difference in the terminal elimination rate constant between [(3)H]spermine and [(14)C]d-mannitol was reduced in the presence of 50 mM spermine, suggesting a retina-to-blood transport system for [(3)H]spermine across the BRB. The retina-to-blood transport of [(3)H]spermine was also supported by a study of the retinal uptake index (RUI). The in vitro transport study with TR-iBRB2 cells, a model cell line of the inner BRB, revealed time-, concentration- and temperature-dependent transport of [(3)H]spermine, suggesting the involvement of carrier-mediated processes in spermine transport across the inner BRB. The in vitro study also suggested that the transport of spermine at the inner BRB is pH-, membrane potential- and Cl(-)-sensitive and Na(+)-insensitive, and these functional properties of spermine transport suggest only a minor contribution of spermine transporters, such as CCC9 (SLC12A8), the expression of which was suggested at the inner BRB. In the inhibition study, [(3)H]spermine transport was markedly inhibited by putrescine, spermidine, spermine and agmatine while substrates of a well-characterized organic cation transporter (OCTs/SLC22A) and a cationic amino acid transporter (CATs/SLC7A) had no effect, suggesting the involvement of unknown transporters in spermine elimination from the retina.

journal_name

Exp Eye Res

journal_title

Experimental eye research

authors

Kubo Y,Tomise A,Tsuchiyama A,Akanuma S,Hosoya K

doi

10.1016/j.exer.2014.05.002

subject

Has Abstract

pub_date

2014-07-01 00:00:00

pages

17-23

eissn

0014-4835

issn

1096-0007

pii

S0014-4835(14)00123-7

journal_volume

124

pub_type

杂志文章

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Involvement of the carrier-mediated process in the retina-to-blood transport of spermine at the inner blood-retinal barrier.