Manganese-based superoxide dismutase mimics modify both acute and long-term outcome severity in a Drosophila melanogaster model of classic galactosemia.

Published

Journal Article

AIMS: The goal of this study was to use two manganese (Mn)-based superoxide dismutase (SOD) mimics to test the hypothesis that reactive oxygen species contribute to both acute and long-term outcomes in a galactose-1P uridylyltransferase (GALT)-null Drosophila melanogaster model of classic galactosemia. RESULTS: We tested the impact of each of two Mn porphyrin SOD mimics, MnTnBuOE-2-PyP(5+), and MnTE-2-PyP(5+), (i) on survival of GALT-null Drosophila larvae reared in the presence versus absence of dietary galactose and (ii) on the severity of a long-term movement defect in GALT-null adult flies. Both SOD mimics conferred a significant survival benefit to GALT-null larvae exposed to galactose but not to controls or to GALT-null larvae reared in the absence of galactose. One mimic, MnTE-2-PyP(5+), also largely rescued a galactose-independent long-term movement defect otherwise seen in adult GALT-null flies. The survival benefit of both SOD mimics occurred despite continued accumulation of elevated galactose-1P in the treated animals, and studies of thiolated proteins demonstrated that in both the presence and absence of dietary galactose MnTE-2-PyP(5+) largely prevented the elevated protein oxidative damage otherwise seen in GALT-null animals relative to controls. INNOVATION AND CONCLUSIONS: Our results confirm oxidative stress as a mediator of acute galactose sensitivity in GALT-null Drosophila larvae and demonstrate for the first time that oxidative stress may also contribute to galactose-independent adult outcomes in GALT deficiency. Finally, our results demonstrate for the first time that both MnTnBuOE-2-PyP(5+) and MnTE-2-PyP(5+) are bioavailable and effective when administered through an oral route in a D. melanogaster model of classic galactosemia.

Full Text

Duke Authors

Cited Authors

  • Jumbo-Lucioni, PP; Ryan, EL; Hopson, ML; Bishop, HM; Weitner, T; Tovmasyan, A; Spasojevic, I; Batinic-Haberle, I; Liang, Y; Jones, DP; Fridovich-Keil, JL

Published Date

  • May 20, 2014

Published In

Volume / Issue

  • 20 / 15

Start / End Page

  • 2361 - 2371

PubMed ID

  • 23758052

Pubmed Central ID

  • 23758052

Electronic International Standard Serial Number (EISSN)

  • 1557-7716

Digital Object Identifier (DOI)

  • 10.1089/ars.2012.5122

Language

  • eng

Conference Location

  • United States