Abstract
Background
The intrauterine adverse environment during nephrogenesis reduces the nephron number, probably associates with impaired ureteric bud (UB) branching.
Methods
The kidneys in C57/BL6 mice were irradiated with a single dose of 10 gray (10 Gy) as adverse environment on postnatal day 3 (irradiated PND3 kidneys) after UB branching ceased. The renal functions and pathological findings of irradiated PND3 kidneys were compared with those of non-irradiated control and 10 Gy irradiation on PND14 (irradiated PND14 kidney) from 1 to 18 months.
Results
The number and density of glomeruli in irradiated PND3 kidneys were reduced by 1 month with renal dysfunction at 6 months. The morphologically incomplete glomeruli with insufficient capillaries were involuted by 1 month in the superficial cortex. Reduced tubular numbers and developmental disability with shortening renal tubules occurred in irradiated PND3 kidneys with impaired urine concentration at 6 months. Hypertrophy of glomeruli developed, and occasional sclerotic glomeruli appeared in the juxtamedullary cortex with hypertension and albuminuria at 12 to 18 months.
Conclusions
The reduced number of nephrons with shortening renal tubules occurred with impaired renal functions in a postnatal adverse environment after cessation of UB branching, and glomerular hypertrophy with occasional glomerulosclerosis developed accompanied with hypertension and albuminuria in the adulthood.
Impact
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The reduced number of nephrons with shortening renal tubules occurred with impaired renal functions in a postnatal adverse environment after cessation of ureteric bud branching.
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The reduced number of glomeruli were associated with not only the impaired formation of glomeruli but also involution of morphologically small incomplete glomeruli after an adverse environment. The insufficiently developed nephrons were characterized by the shortening renal tubules with impaired urine concentration. In addition, glomerular hypertrophy and occasional glomerulosclerosis developed with hypertension and albuminuria in adulthood.
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The present study can help to understand the risk of alternations of premature nephrons in preterm neonates.
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Acknowledgements
We express special thanks to Mr. Takashi Arai, Ms. Kyoko Wakamatsu, Ms. Arimi Ishikawa, Ms. Naomi Kuwahara, and Ms. Haruna Shimizu for expert technical assistance.
Funding
This work was supported by the Japan Society for the Promotion of Science Grant-in-Aid for Scientific Research (KAKENHI) [grant number 20K08620 (A.S.)].
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Masako Tagawa., A.M., Y.T., and A.S. designed the research. Mika Terasaki and A.S. directed the study. Masako Tagawa, Mika Terasaki, A.M., E.T., Y.K., S.K., Y.T., and A.S. performed the experiments and analyzed the data and pathology. Masako Tagawa, Mika Terasaki, A.M., and E.T. drafted the manuscript. S.K., Y.T., and A.S. approved the final version of the manuscript. A.S. acquired the research funding. All authors discussed the results and commented on the manuscript.
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Tagawa, M., Terasaki, M., Mii, A. et al. The reduced number of nephrons with shortening renal tubules in mouse postnatal adverse environment. Pediatr Res 93, 1873–1882 (2023). https://doi.org/10.1038/s41390-022-02332-0
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DOI: https://doi.org/10.1038/s41390-022-02332-0