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2018 ; 13
(5
): e0197356
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Constitutive metanephric mesenchyme-specific expression of interferon-gamma
causes renal dysplasia by regulating Sall1 expression
#MMPMID29771971
Yun K
; Hurwitz AA
; Perantoni AO
PLoS One
2018[]; 13
(5
): e0197356
PMID29771971
show ga
Transplacental viral and parasitic infections have been shown to initiate an
innate response in the mammalian embryo by increasing the expression of
pro-inflammatory cytokines such as interferon-gamma (Ifng). However, the
developmental consequences of an activated innate immunity and, in particular,
the effects of induction of Ifng expression independent of infection have been
largely overlooked. Here, we demonstrate in vivo that the conditional
overexpression of Ifng in metanephric mesenchymal (MM) progenitors results in
renal agenesis or hypoplasia. Cell death was observed in and around the MM region
of E10.5-11.5 mutants where Ifng was constitutively expressed during early kidney
development and resulted in a retardation of branching morphogenesis.
Furthermore, isolated mutant or normal Ifng-treated metanephroi replicated this
phenotype in culture, demonstrating the inherent nature of the aberrant
morphogenesis. The expression of renal progenitor marker Sall1 was significantly
decreased in the MM of mutant kidneys, suggesting that a reduction in Sall1 may
be the cause of cell death in the MM during early kidney development and that, in
turn, retards UB branching in the mutants. Therefore, the aberrant induction of
Ifng expression, as part of an innate immune response, may contribute to renal
agenesis or hypoplasia during early metanephric development by regulating the MM
progenitor population.