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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+Med+Sci
2016 ; 352
(3
): 296-301
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Urea Transporter B and MicroRNA-200c Differ in Kidney Outer Versus Inner Medulla
Following Dehydration
#MMPMID27650235
Wang J
; Wang XH
; Wang H
; Chen L
; Klein JD
; Sands JM
Am J Med Sci
2016[Sep]; 352
(3
): 296-301
PMID27650235
show ga
BACKGROUND: Urea transporters (UTs) are important in urine concentration and in
urea recycling, and UT-B has been implicated in both. In kidney, UT-B was
originally localized to outer medullary descending vasa recta, and more recently
detected in inner medullary descending vasa recta. Endogenously produced
microRNAs (miRs) bind to the 3'UTR of genes and generally inhibit their
translation, thus playing a pivotal role gene regulation. METHODS: Mice were
dehydrated for 24 hours then sacrificed. Inner and outer medullas were analyzed
by polymerase chain reaction (PCR) and quantitative PCR for miRNA expression and
analyzed by western blotting for protein abundance. RESULTS: MiRNA sequencing
analysis of mouse inner medullas showed a 40% increase in miRNA-200c in
dehydrated mice compared with controls. An in silico analysis of the targets for
miR-200c revealed that miRNA-200c could directly target the gene for UT-B. PCR
confirmed that miR-200c is up-regulated in the inner medullas of dehydrated mice
while western blot showed that UT-B protein abundance was down-regulated in the
same portion of the kidney. However, in the outer medulla, miR-200c was reduced
and UT-B protein was increased in dehydrated mice. CONCLUSIONS: This is the first
indication that UT-B protein and miR-200c may each be differentially regulated by
dehydration within the kidney outer and inner medulla. The inverse correlation
between the direction of change in miR-200c and UT-B protein abundance in both
the inner and outer medulla suggests that miR-200c may be associated with the
change in UT-B protein in these 2 portions of the kidney medulla.
|Animals
[MESH]
|Blotting, Western
[MESH]
|Dehydration/genetics/*metabolism
[MESH]
|Down-Regulation
[MESH]
|Gene Expression Regulation
[MESH]
|Kidney Medulla/*metabolism
[MESH]
|Male
[MESH]
|Membrane Transport Proteins/genetics/*metabolism
[MESH]