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Renal Aging Resembles a Continuum Between Normal and Diseased Kidneys That Potentiates Inflammatory Response to
Su Woong Jung1, Dong Jin Kim1, Yang Gyun Kim1
1Division of Nephrology, Department of Internal Medicine, Kyung Hee University Hospital at Gangdong, Seoul, Republic of Korea.
Summary
Kidney aging shares molecular similarities with kidney disease, showing increased immune activation. Aging kidneys experience more severe damage when exposed to injury, suggesting aging kidneys exist on a continuum toward disease.
Area of Science:
- Nephrology
- Immunology
- Molecular Biology
Background:
- Renal aging causes structural and functional kidney decline, mimicking diseased kidneys.
- Understanding the molecular basis of renal aging is crucial for identifying interventions.
Purpose of the Study:
- To compare the molecular and functional changes in aging kidneys versus adenine-induced nephropathy.
- To investigate how aging affects kidney response to injury.
Main Methods:
- Whole-kidney RNA sequencing in aging mice and young mice with adenine-induced nephropathy.
- Comparison of functional and structural renal consequences in young and old mice under normal and adenine-fed conditions.
- Utilized C57BL/6 male mice for all experimental studies.
Main Results:
- Both aging and adenine-induced nephropathy showed increased immune system activation and inflammation.
- Adenine-induced nephropathy exhibited higher expression of genes related to cytokines, T-cell activation, and fibrosis.
- Aging kidneys demonstrated more severe tubular injury and fibrosis with a stronger inflammatory response when challenged with adenine.
- Aging kidneys showed decreased expression of genes related to transporter activity and metabolism compared to adenine-induced nephropathy.
Conclusions:
- Renal aging and kidney disease share overlapping molecular pathways, particularly immune system upregulation.
- Aging kidneys are more susceptible to injury, suggesting a continuum from normal to diseased states.
- Subclinical inflammation in aging kidneys may exacerbate damage from external stimuli.
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