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Melamine-induced urolithiasis in a Drosophila model
Wen-Chi Chen1, Wei-Yong Lin, Huey-Yi Chen
1Graduate Institute of Integrated Medicine, College of Chinese Medicine, China Medical University, Taichung, Taiwan.
Abstract:
Melamine-tainted food can induce renal stones in both humans and animals. We have previously reported a novel Drosophila model for the study of renal stone disease. In addition to hyperoxaluria-causing agents, we also tested herein the effect of melamine on crystal formation in Drosophila . The results indicate that administration of melamine alone caused crystal formation in a dose-dependent manner. The crystals also appeared after ingestion of melamine for 3 weeks in the Malpighian tubules of Drosophila when viewed with polarized light. Administration of potassium citrate (K citrate) was found to significantly ameliorate the melamine-induced reduction of lifespan. However, administration of K citrate failed to reduce the quantity of crystals. Because calcium oxalate is not the major crystal induced by melamine, the predominant components of melamine-induced crystals and the potential crystal inhibitors warrant further investigation.
Insights
Melamine causes dose-dependent crystal formation in Drosophila, leading to kidney stones. Potassium citrate extended lifespan but did not reduce crystal quantity, indicating further research is needed on crystal composition and inhibitors.
Area of Science:
- Toxicology
- Nephrology
- Genetics
Background:
- Melamine contamination in food is a public health concern, linked to renal stone formation in humans and animals.
- A novel Drosophila model for renal stone disease was previously established.
- The effect of melamine on crystal formation in this Drosophila model was investigated.
Purpose of the Study:
- To investigate the effect of melamine on crystal formation in the Drosophila model.
- To assess the efficacy of potassium citrate in mitigating melamine-induced renal pathology and lifespan reduction.
Main Methods:
- Drosophila melanogaster were administered varying doses of melamine.
- Crystal formation in Malpighian tubules was observed using polarized light microscopy after 3 weeks.
- The impact of potassium citrate administration on lifespan and crystal load was evaluated.
Main Results:
- Melamine administration induced crystal formation in a dose-dependent manner.
- Crystals were observed in the Malpighian tubules of Drosophila after 3 weeks of melamine ingestion.
- Potassium citrate significantly ameliorated the reduction in lifespan caused by melamine but did not reduce crystal quantity.
Conclusions:
- Melamine alone can induce crystal formation in the Drosophila model.
- Potassium citrate may offer a protective effect on lifespan against melamine toxicity.
- The composition of melamine-induced crystals differs from calcium oxalate, necessitating further investigation into their nature and potential inhibitors.
