Comparison of the dark and light-induced toxicity of thio and seleno analogues of the thiopyrylium dye AA1.

Abstract:

:2,6-Bis(4-anilino)-4-(4-N,N-dimethylanilino)thiopyrylium chloride (AA1) and -selenopyrylium chloride (AA1-Se) and 2,6-bis(4-anilino)-4-(4-N-morpholinophenyl)thiopyrylium chloride (1) and -selenopyrylium chloride (2) were prepared via the addition of 4-N,N-dimethylanilino magnesium bromide and 4-N-morpholinophenyl magnesium bromide to chalcogenopyranones 3 followed by treatment with HCl gas then water. Cellular uptake of these dyes varied from 12+/-3fmol/cell for AA1 to 150+/-40 fmol/cell for AA1-Se. upon exposure to 5 x 10(-5) M solutions of the dyes for 3 h. Exposure of cell cultures to 1.8 J/cm2) of 360-750-nm light following incubation with 1 x 10(-6) M of either AA1, 1, or 2 for 24h resulted in no significant additional phototoxicity while AA1-Se showed a significant (p < 0.05) reduction in cell viability from 81% to 46%. Thiopyrylium dyes AA1 and 1 showed significant dark toxicity relative to selenopyrylium dyes AA1-Se and 2, respectively. AA1 was the only one of the four dyes to show inhibition of whole-cell mitochondrial cytochrome c oxidase activity in the dark. Irradiation of whole cells or mitochondrial suspensions treated with AA1, AA1-Se, or 2 gave inhibition of mitochondrial cytochrome c oxidase activity. Studies of JC-1-efflux indicated that all four cationic dyes accelerated the loss of JC-1 from the mitochondria, which suggests that all four dyes target the mitochondria.

journal_name

Bioorg Med Chem

authors

Detty MR,Gibson SL,Hilf R

doi

10.1016/j.bmc.2004.03.025

subject

Has Abstract

pub_date

2004-05-15 00:00:00

pages

2589-96

issue

10

eissn

0968-0896

issn

1464-3391

pii

S096808960400210X

journal_volume

12

pub_type

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