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Published on: June 21, 2015
Targeting the HIF-1α/PPARγ axis with curcumin carbon dots to combat uranium nephrotoxicity
Zhimin Jia1, Chang Wang2, Xiaowen Han1
1Department of Nuclear Medicine, NHC Key Laboratory of Nuclear Technology Medical Transformation, Sichuan Provincial Engineering Research Center of Nuclear Medical Equipment Translation and Application, Sichuan Clinical Research Center for Radiation and Therapy, Mianyang Central Hospital, Mianyang, 621000, China.
Researchers identified the HIF-1α/PPARγ axis as crucial in uranium-induced kidney injury, driving lipid changes. Curcumin-derived carbon dots (CCDs-210) effectively targeted this axis, mitigating damage and offering a potential therapeutic strategy for uranium nephrotoxicity.
Area of Science:
- Toxicology
- Nanomedicine
- Molecular Biology
Background:
- Uranium exposure causes kidney damage through complex mechanisms.
- Current therapeutic options for uranium nephrotoxicity are limited.
- Lipid reprogramming plays a significant role in uranium-induced renal injury.
Purpose of the Study:
- To elucidate the role of the HIF-1α/PPARγ axis in uranium nephrotoxicity.
- To investigate curcumin-derived carbon dots (CCDs-210) as a potential therapeutic agent.
- To establish a mechanistic link between the HIF-1α/PPARγ axis and renal lipid metabolism disruption.
Main Methods:
- Molecular docking, co-immunoprecipitation (Co-IP), ChIP-qPCR, and dual-luciferase reporter assays were used to confirm HIF-1α regulation of PPARγ.
- HIF-1α knockdown/knockout models and PPARγ modulators (GW9662, Rosi) validated the axis's role.
- Curcumin-derived carbon dots (CCDs) were synthesized and characterized; their cellular uptake and therapeutic effects were assessed in vitro and in vivo.
Main Results:
- HIF-1α was confirmed to directly regulate PPARγ expression, driving lipotoxicity in uranium-exposed kidney cells.
- CCDs-210 demonstrated excellent biocompatibility, efficient cellular uptake via active endocytosis, and ROS scavenging.
- In uranium-exposed cells and animal models, CCDs-210 suppressed the HIF-1α/PPARγ axis, reversed lipid dysregulation, reduced oxidative stress and inflammation, and improved renal function and histopathology.
Conclusions:
- The HIF-1α/PPARγ axis is a central mediator of uranium-induced nephrotoxicity.
- CCDs-210 represent a promising nanotherapeutic strategy for uranium kidney injury by targeting the HIF-1α/PPARγ axis.
- This study provides mechanistic insights and a translatable therapeutic approach for mitigating uranium-induced renal damage.
