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2017 ; 28
(7
): 2093-2107
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Pals1 Haploinsufficiency Results in Proteinuria and Cyst Formation
#MMPMID28154200
Weide T
; Vollenbröker B
; Schulze U
; Djuric I
; Edeling M
; Bonse J
; Hochapfel F
; Panichkina O
; Wennmann DO
; George B
; Kim S
; Daniel C
; Seggewiß J
; Amann K
; Kriz W
; Krahn MP
; Pavenstädt H
J Am Soc Nephrol
2017[Jul]; 28
(7
): 2093-2107
PMID28154200
show ga
The nephron is the basic physiologic subunit of the mammalian kidney and is made
up of several apicobasally polarized epithelial cell types. The process of
apicobasal polarization in animal cells is controlled by the evolutionarily
conserved Crumbs (CRB), Partitioning-defective, and Scribble protein complexes.
Here, we investigated the role of protein associated with LIN-7 1 (Pals1, also
known as Mpp5), a core component of the apical membrane-determining CRB complex
in the nephron. Pals1 interacting proteins, including Crb3 and Wwtr1/Taz, have
been linked to renal cyst formation in mice before. Immunohistologic analysis
revealed Pals1 expression in renal tubular cells and podocytes of human kidneys.
Mice lacking one Pals1 allele (functionally haploid for Pals1) in nephrons
developed a fully penetrant phenotype, characterized by cyst formation and severe
defects in renal barrier function, which led to death within 6-8 weeks. In
Drosophila nephrocytes, deficiency of the Pals1 ortholog caused alterations in
slit-diaphragm-like structures. Additional studies in epithelial cell culture
models revealed that Pals1 functions as a dose-dependent upstream regulator of
the crosstalk between Hippo- and TGF-?-mediated signaling. Furthermore, Pals1
haploinsufficiency in mouse kidneys associated with the upregulation of Hippo
pathway target genes and marker genes of TGF-? signaling, including biomarkers of
renal diseases. These findings support a link between apical polarity proteins
and renal diseases, especially renal cyst diseases. Further investigation of the
Pals1-linked networks is required to decipher the mechanisms underlying the
pathogenesis of these diseases.