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Severely reduced production of klotho in human chronic renal failure kidney
N Koh1, T Fujimori, S Nishiguchi
1Department of Pathology and Tumor Biology, Kyoto University Graduate School of Medicine, Konoe-cho, Yoshida, Sakyo-ku, Kyoto, 606-8501, Japan.
Abstract:
We recently identified a novel gene, termed klotho (kl) that is involved in the development of a syndrome in mice resembling human aging. A defect of the kl gene expression in mice leads to multiple disorders including arteriosclerosis, osteoporosis, ectopic calcification, and skin atrophy together with short life-span and infertility. Patients with chronic renal failure (CRF), develop multiple complications that are reminiscent of phenotypes observed in kl mutant mice. Furthermore, the kl gene is mainly expressed in kidney and brain. These evidences above suggest the possible involvement of Klotho function in the complications arising in CRF patients. To investigate the above possibility, we examined the kidneys of 10 clinically or histologically diagnosed CRF cases. The level of kl gene expression was measured by utilizing RNase protection assay. The expression of Klotho protein was assayed by utilizing Western blot analysis and by immunohistochemistry. The levels of kl mRNA expression were greatly reduced in all CRF kidneys. Moreover, the production of Klotho protein was also severely reduced in all CRF kidneys. These results suggest that the decrease in kl gene expression in CRF patients may underlie the deteriorating process of multiple complications in the CRF patients.
Insights
Reduced klotho gene expression in chronic renal failure (CRF) patients is linked to aging-like symptoms. This study found significantly lower klotho mRNA and protein levels in CRF kidneys, suggesting a role in disease progression.
Area of Science:
- Genetics and Molecular Biology
- Nephrology
- Aging Research
Background:
- The klotho (kl) gene is crucial for preventing aging-like syndromes in mice.
- Chronic renal failure (CRF) patients exhibit complications similar to klotho-deficient mice.
- Klotho is primarily expressed in the kidneys and brain.
Purpose of the Study:
- To investigate the potential role of Klotho in the pathogenesis of chronic renal failure complications.
- To examine klotho gene and protein expression levels in the kidneys of CRF patients.
Main Methods:
- Analysis of klotho gene expression using RNase protection assay.
- Assessment of Klotho protein levels via Western blot and immunohistochemistry.
- Examination of kidney tissues from 10 clinically or histologically diagnosed CRF cases.
Main Results:
- Significantly reduced klotho mRNA expression was observed in all CRF kidneys studied.
- Severely diminished Klotho protein production was detected in all CRF kidneys.
- These findings indicate a strong correlation between decreased klotho expression and CRF.
Conclusions:
- The decline in klotho gene expression in CRF patients may contribute to the development of multiple disease complications.
- Klotho deficiency is implicated in the pathophysiology of chronic renal failure.
- Further research into Klotho's role could reveal new therapeutic targets for CRF.