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2016 ; 6
(ä): 26792
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Preserved Nephrogenesis Following Partial Nephrectomy in Early Neonates
#MMPMID27244673
Kirita Y
; Kami D
; Ishida R
; Adachi T
; Tamagaki K
; Matoba S
; Kusaba T
; Gojo S
Sci Rep
2016[May]; 6
(ä): 26792
PMID27244673
show ga
Reconstitution of total nephron segments after resection in the adult kidney has
not been achieved; however, whether the neonatal kidney can maintain the capacity
for neo-nephrogenesis after resection is unknown. We performed partial resection
of the kidney in neonatal rats on postnatal days 1 (P1x kidney) and 4 (P4x
kidney) and examined morphological changes and relevant factors. The P1x kidney
bulged into the newly formed cortex from the wound edge, while nephrogenesis
failure was prominent in the P4x kidney. Twenty-eight days post-resection, the
glomerular number, cortex area, and collecting duct were preserved in the P1x
kidney, whereas these parameters were markedly decreased in the P4x kidney.
During normal development, Six2 expression and Six2+ nephron progenitor cells in
the cap mesenchyme both rapidly disappear after birth. However, time course
analysis for the P1x kidney showed that Six2 expression and Six2+ cells were well
preserved in the tissue surrounding the resected area even 2 days after
resection. In conclusion, our results indicate that kidneys in early neonate rats
retain the capability for neo-nephrogenesis after resection; however, this
ability is lost soon after birth, which may be attributed to a declining amount
of Six2+ cells.