Nakazawa T, Yamaguchi Y, Fukunaga Y, Tamura K. A possible critical dosing period of p-cumylphenol for development of cystic kidneys in rat neonates.
J Toxicol Pathol 2022;
35:123-127. [PMID:
35221506 PMCID:
PMC8828611 DOI:
10.1293/tox.2021-0010]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 08/30/2021] [Indexed: 11/19/2022] Open
Abstract
In accordance with a previous report on cystic kidneys induced in rat neonates when
dosed with p-cumylphenol (PCP) for 18 days from postnatal day (PND) 4, 3 rat neonates were
dosed with PCP once a day for 14 days, either from PND 14, 21, 28, 35, or 42 as W2, W3,
W4, W5, and W6 groups, respectively, to investigate whether dosing periods in different
PNDs influenced the development of cystic renal tubules. The lesion was striking in the W2
group and at a lesser magnitude in the W3 group, whereas either kidney was unaffected when
dosing was initiated beyond PND 28. These findings, together with the results from the
previous study, suggested that PND 14-28 is a critical dosing period for PCP to develop
cystic kidneys in rat neonates. The lining epithelium of the cystic tubules was
immunohistochemically positive for AQP2. This finding and the anatomical location
indicated that the cystic tubules were of collecting duct origin. Either obstruction,
fluid accumulation, or reparative hyperplasia of the lining epithelium was unlikely to be
involved in the formation of cystic tubules lined with a monolayer of cuboidal or columnar
epithelium with a high nuclear density. Thus, the follow-up investigation on PCP suggested
a critical dosing period of PND 14-28 in rat neonates for the development of cystic
dilation of renal collecting ducts. This study further supports that additive hyperplasia
of the lining epithelium is a fundamental basis of this unique lesion.
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