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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Physiol+Cell+Physiol
2014 ; 306
(12
): C1167-75
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Jnk2 deletion disrupts intestinal mucosal homeostasis and maturation by
differentially modulating RNA-binding proteins HuR and CUGBP1
#MMPMID24740539
Chung HK
; Rao JN
; Zou T
; Liu L
; Xiao L
; Gu H
; Turner DJ
; Yang P
; Wang JY
Am J Physiol Cell Physiol
2014[Jun]; 306
(12
): C1167-75
PMID24740539
show ga
Homeostasis and maturation of the mammalian intestinal epithelium are preserved
through strict regulation of cell proliferation, apoptosis, and differentiation,
but the exact mechanism underlying this process remains largely unknown. c-Jun
NH2-terminal kinase 2 (JNK2) is highly expressed in the intestinal mucosa, and
its activation plays an important role in proliferation and also mediates
apoptosis in cultured intestinal epithelial cells (IECs). Here, we investigated
the in vivo function of JNK2 in the regulation of intestinal epithelial
homeostasis and maturation by using a targeted gene deletion approach. Targeted
deletion of the jnk2 gene increased cell proliferation within the crypts in the
small intestine and disrupted mucosal maturation as indicated by decreases in the
height of villi and the villus-to-crypt ratio. JNK2 deletion also decreased
susceptibility of the intestinal epithelium to apoptosis. JNK2-deficient
intestinal epithelium was associated with an increase in the level of the
RNA-binding protein HuR and with a decrease in the abundance of CUG-binding
protein 1 (CUGBP1). In studies in vitro, JNK2 silencing protected intestinal
epithelial cell-6 (IEC-6) cells against apoptosis and this protection was
prevented by inhibiting HuR. Ectopic overexpression of CUGBP1 repressed IEC-6
cell proliferation, whereas CUGBP1 silencing enhanced cell growth. These results
indicate that JNK2 is essential for maintenance of normal intestinal epithelial
homeostasis and maturation under biological conditions by differentially
modulating HuR and CUGBP1.