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1 Rainbow Center for Childhood PKD, Department of Pediatrics, Rainbow Babies and Children's Hospital and Case Western Reserve University, Cleveland; and 2 Department of Physiology and Biophysics, 3 Case Western Reserve University Cancer Center, Cleveland, Ohio, 44106
To study the pathophysiology of
autosomal recessive polycystic kidney disease (ARPKD), we sought
to develop conditionally immortalized control and cystic murine
collecting tubule (CT) cell lines. CT cells were isolated from
intercross breedings between BPK mice
(bpk+/
), a murine model of ARPKD,
and the Immorto mice
(H-2Kb-ts-A58+/+).
Second-generation outbred offspring (BPK × Immorto) homozygous for the BPK mutation (bpk
/
;
Im+/±; cystic
BPK/H-2Kb-ts-A58), were phenotypically
indistinguishable from inbred cystic BPK animals
(bpk
/
). Cystic
BPK/H-2Kb-ts-A58 mice developed biliary ductal
ectasia and massively enlarged kidneys, leading to renal failure and
death by postnatal day 24. Principal cells (PC) were
isolated from outbred cystic and noncystic BPK/H-2Kb-ts-A58 littermates at specific
developmental stages. Epithelial monolayers were under nonpermissive
conditions for markers of epithelial cell polarity and PC function.
Cystic and noncystic cells displayed several properties characteristic
of PCs in vivo, including amiloride-sensitive sodium transport and
aquaporin 2 expression. Cystic cells exhibited apical epidermal growth
factor receptor (EGFR) mislocalization but normal expression of ZO-1 and E-cadherin. Hence, these cell lines retain the requisite
characteristics of PCs, and cystic
BPK/H-2Kb-ts-A58 PCs retained the abnormal EGFR
membrane expression characteristic of ARPKD. These cell lines represent
important new reagents for studying the pathogenesis of ARPKD.
epidermal growth factor receptor, principal cells, cystic kidney
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