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2002 ; 245
(1
): 157-71
Nephropedia Template TP
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English Wikipedia
Deregulated expression of the homeobox gene Cux-1 in transgenic mice results in
downregulation of p27(kip1) expression during nephrogenesis, glomerular
abnormalities, and multiorgan hyperplasia
#MMPMID11969263
Ledford AW
; Brantley JG
; Kemeny G
; Foreman TL
; Quaggin SE
; Igarashi P
; Oberhaus SM
; Rodova M
; Calvet JP
; Vanden Heuvel GB
Dev Biol
2002[May]; 245
(1
): 157-71
PMID11969263
show ga
Cux-1 is a murine homeobox gene that is highly expressed in the developing kidney
with expression restricted to the nephrogenic zone. Cux-1 is highly expressed in
cyst epithelium of polycystic kidneys from C57BL/6J-cpk/cpk mice, but not in
kidneys isolated from age-matched phenotypically normal littermates. To further
elucidate the role of Cux-1 in renal development, we generated transgenic mice
expressing Cux-1 under the control of the CMV immediate early gene promoter. Mice
constitutively expressing Cux-1 developed multiorgan hyperplasia and
organomegaly, but not an overall increase in body size. Transgenic kidneys were
enlarged 50% by 6 weeks of age, with the increased growth primarily restricted to
the cortex. Proliferating cells were found in proximal and distal tubule
epithelium throughout the cortex, and the squamous epithelium that normally lines
Bowman's capsule was replaced with proximal tubule epithelium. However, the total
number of nephrons was not increased. In the developing kidneys of transgenic
mice, Cux-1 was ectopically expressed in more highly differentiated tubules and
glomeruli, and this was associated with reduced expression of the cyclin kinase
inhibitor, p27. Transient transfection experiments revealed that Cux-1 is an
inhibitor of p27 promoter activity. These results suggest that Cux-1 regulates
cell proliferation during early nephrogenesis by inhibiting expression of p27.