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Spermidine Delays Eye Lens Opacification in vitro by Suppressing Transglutaminase-Catalyzed Crystallin Cross-Linking

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Abstract

A Ca2+-dependent TG activity, identified in the eye lens of several mammalian species, has long been implicated in cataract formation. The precise mechanism of the involvement of this enzyme in this process remains unclear. The purpose of this work was to investigate the modulatory effect of polyamines on TG activity during rabbit eye lens in vitro opacification. We observed, in an in vitro Ca2+-induced cataract model, a rapid decrease of the endogenous levels of SPD with the progression of opacification, paralleled by an increase of crystallin cross-linking by bis(γ-glutamyl)SPD. This pattern was reversed adding exogenous SPD to the incubation medium. Indeed, endogenous SPD levels were restored and cross-linking by bis(γ-glutamyl)SPD were drastically reduced. Surprisingly, under this experimental condition, the loss of transparency of lens was delayed. We found that exogenous SPD incubation led to a remarkable increase of mono(γ-glutamyl)SPD, likely responsible of the inhibition of cross-linking of lens crystallins and of the transparency persistence.

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Abbreviations

TG:

Transglutaminase

PUT:

Putrescine

SPD:

Spermidine

SPM:

Spermine

PBS:

Phosphate buffer saline

EGTA:

Ethylene glycol tetraacetic acid

TCA:

Trichloroacetic acid

PCA:

Perchloric acid

OPA:

Ortho-phtalaldehyde

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Correspondence to Simone Beninati.

Additional information

Dr. John E. Folk, one of the fathers of transglutaminase, passed away unexpectedly on 27 December 2010, as the result of an accident. The authors would like to dedicate this work to his memory.

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Lentini, A., Tabolacci, C., Mattioli, P. et al. Spermidine Delays Eye Lens Opacification in vitro by Suppressing Transglutaminase-Catalyzed Crystallin Cross-Linking. Protein J 30, 109–114 (2011). https://doi.org/10.1007/s10930-011-9311-7

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