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Aging Selectively Modulates Vitamin C Transporter Expression Patterns in the Kidney.
Katherine Forman1,2, Fernando Martínez1, Manuel Cifuentes3
1Centro de Microscopía Avanzada, CMA BIO BIO, Facultad de Ciencias Biológicas, Universidad de Concepción, Concepción, Chile.
Kidneys adapt to aging by increasing sodium-vitamin C cotransporter 1 (SVCT1) expression in proximal tubules, enhancing vitamin C reabsorption in older animals.
Area of Science:
- Nephrology
- Gerontology
- Cell Biology
Background:
- Vitamin C (ascorbic acid) is crucial for cellular function.
- Kidney reabsorbs vitamin C via sodium-vitamin C cotransporter 1 (SVCT1).
- Aging is associated with decreased vitamin C levels, but kidney's adaptive mechanisms remain unclear.
Purpose of the Study:
- Investigate age-related morphological changes in kidney tissue.
- Determine changes in vitamin C transporter expression during aging.
- Elucidate kidney's adaptive response to aging regarding vitamin C reabsorption.
Main Methods:
- Used senescence-accelerated mice (SAMP8) as an animal model.
- Performed histological analysis, 2-photon microscopy, and second harmonic generation.
- Employed laser microdissection, qRT-PCR, and immunohistochemistry to analyze gene and protein expression.
Main Results:
- Observed significant kidney morphological changes in aged mice, including periglomerular lymphocytic infiltrate and glomerular congestion.
- Identified dilation of intracellular spaces in the basolateral region of proximal tubule epithelial cells.
- Found increased SVCT1 expression in S3 (outer medulla) and S2 (cortex) proximal tubules, co-expressed with GLUT1, in aged mice.
Conclusions:
- Aging alters kidney morphology and vitamin C transporter expression.
- Renal SVCT1 over-expression enhances vitamin C reabsorption in aged animals.
- This adaptation may compensate for reduced endogenous vitamin C synthesis in aging.
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