MSC-EXs inhibits uranium nephrotoxicity by competitively binding key proteins and inhibiting ROS production

Area of Science:

• Toxicology
• Regenerative Medicine
• Nanomedicine

Background:

• Depleted Uranium (DU) exposure causes significant cellular damage, particularly in the kidneys, with no effective treatments available.
• Uranyl ions bind to blood proteins and enter cells, leading to organ damage and posing a clinical challenge.
• Current treatments for uranium poisoning are limited, necessitating the exploration of novel therapeutic strategies.

Purpose of the Study:

• To investigate the therapeutic potential of human umbilical cord-derived mesenchymal stem cell exosomes (MSC-EXs) against depleted uranium (DU) poisoning in a mouse model.
• To evaluate the efficacy of MSC-EXs in ameliorating renal damage, promoting uranium excretion, and reducing internal uranium retention.
• To elucidate the underlying mechanisms by which MSC-EXs exert their protective effects against DU toxicity.

Main Methods:

• Mice exposed to depleted uranium were treated with MSC-EXs.
• Renal damage, kidney and bone marrow morphology, and uranium excretion levels were assessed.
• Proteomic analysis was employed to investigate the molecular mechanisms of MSC-EXs, including protein binding and metabolic pathway modulation.
• Oxidative stress markers, including mitochondrial ROS production and lipid peroxidation, were measured.

Main Results:

• MSC-EXs significantly ameliorated renal damage and improved kidney and bone marrow morphology in DU-exposed mice.
• Treatment with MSC-EXs effectively promoted uranium excretion and reduced uranium retention within the body.
• Proteomic analysis revealed that MSC-EXs competitively bind to uranyl ions with proteins like transferrin, osteopontin, and albumin, reducing cellular deposition.
• MSC-EXs enhanced oxidative stress resistance by modulating glutathione, cysteine, and methionine metabolism, leading to reduced apoptosis and ferroptosis.

Conclusions:

• Human umbilical cord-derived MSC-EXs represent a novel and effective therapeutic strategy for depleted uranium poisoning.
• MSC-EXs demonstrate superior protective effects compared to MSCs and are comparable to sodium bicarbonate in managing DU toxicity.
• The study highlights the potential of MSC-EXs in reducing uranyl ion deposition, enhancing cellular resistance to oxidative stress, and promoting uranium excretion.