Youthful systemic milieu alleviates renal ischemia-reperfusion injury in elderly mice

Area of Science:

• Gerontology
• Nephrology
• Regenerative Medicine

Background:

• Acute kidney injury (AKI) is prevalent and challenging to manage in the elderly.
• Renal ischemia-reperfusion injury (IRI) is a significant cause of AKI.
• The potential of a young systemic environment to mitigate age-related organ decline, specifically renal IRI, remains unexplored.

Purpose of the Study:

• To investigate whether a youthful systemic environment can reduce renal IRI in elderly individuals.
• To explore the underlying mechanisms, including oxidative stress, inflammation, apoptosis, and autophagy.

Main Methods:

• Establishment of a parabiosis model connecting young (12-week-old) and old (24-month-old) mice.
• Induction of bilateral renal IRI in old mice within the parabiosis setup.
• Assessment of renal histology, function, oxidative stress, inflammation, apoptosis, and autophagy at 24 hours post-IRI.

Main Results:

• Old mice with IRI exhibited significant renal damage, impaired function, increased oxidative stress, inflammation, and apoptosis, with no change in autophagy.
• Old-old parabiosis did not alter IRI-induced damage but improved renal function.
• Young-old parabiosis significantly reduced renal injury, improved function, decreased oxidative stress, inflammation, and apoptosis, while increasing autophagy compared to old-old parabiosis.

Conclusions:

• A youthful systemic milieu can ameliorate renal IRI in elderly mice.
• This protective effect is mediated by reduced oxidative stress, inflammation, and apoptosis, alongside enhanced autophagy.
• The findings suggest novel therapeutic strategies for preventing and treating AKI in the elderly.