Identification of a Free Non-tryptophan Fluorophore in Water-soluble Fraction of Human Brunescent Cataractous Lens Nucleus.

Abstract:

:Purpose: We previously reported that a unique free fluorophore (Fl-Glc), presumably a beta-glucoside, is particularly abundant in human brunescent cataractous lens nuclei. Our preliminary experiments indicated that incubation of low-molecular weight (MW) fraction of non-brunescent lens nuclei causes an increase in a particular fluorophore (Fl-X). This study was undertaken to compare the Fl-Glc with the Fl-X and subsequently to identify the Fl-X.Methods: Experiment (1) The purified Fl-X and its beta-glucosidase digest (aglycon) were compared with the Fl-Glc and its aglycon, respectively, by high-performance liquid chromatography (HPLC). Experiment (2) i) The Fl-X and its aglycon were analysed by liquid chromatography/mass spectrometry (LC/MS). ii) Authentic xanthurenic acid was analysed by HPLC and LC/MS.Results: Experiment (1) The retention times of the Fl-X and the Fl-Glc exactly coincided. The fluorescence peaks of both disappeared after beta-glucosidase treatment. Experiment (2) i) LC/MS results suggested that the MWs of the Fl-X and its aglycon were 367 and 205, respectively. ii) HPLC and LC/MS results for xanthurenic acid (MW = 205) were exactly the same as those for the aglycon of the Fl-X.Conclusions: The Fl-Glc and the Fl-X are identifical, and the Fl-X (= Fl-Glc) is a glucoside of xanthurenic acid.

journal_name

Jpn J Ophthalmol

authors

Ando K,Shirao E,Iwakuchi Y,Shirao Y,Inoue A

doi

10.1016/s0021-5155(00)00236-7

keywords:

subject

Has Abstract

pub_date

2000-09-01 00:00:00

pages

569

issue

5

eissn

0021-5155

issn

1613-2246

pii

S0021-5155(00)00236-7

journal_volume

44

pub_type

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