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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 PLoS+One
2017 ; 12
(3
): e0168638
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Targeting gene expression to specific cells of kidney tubules in vivo, using
adenoviral promoter fragments
#MMPMID28253301
Watanabe S
; Ogasawara T
; Tamura Y
; Saito T
; Ikeda T
; Suzuki N
; Shimosawa T
; Shibata S
; Chung UI
; Nangaku M
; Uchida S
PLoS One
2017[]; 12
(3
): e0168638
PMID28253301
show ga
Although techniques for cell-specific gene expression via viral transfer have
advanced, many challenges (e.g., viral vector design, transduction of genes into
specific target cells) still remain. We investigated a novel, simple methodology
for using adenovirus transfer to target specific cells of the kidney tubules for
the expression of exogenous proteins. We selected genes encoding sodium-dependent
phosphate transporter type 2a (NPT2a) in the proximal tubule,
sodium-potassium-2-chloride cotransporter (NKCC2) in the thick ascending limb of
Henle (TALH), and aquaporin 2 (AQP2) in the collecting duct. The promoters of the
three genes were linked to a GFP-coding fragment, the final constructs were then
incorporated into an adenovirus vector, and this was then used to generate
gene-manipulated viruses. After flushing circulating blood, viruses were directly
injected into the renal arteries of rats and were allowed to site-specifically
expression in tubule cells, and rats were then euthanized to obtain kidney
tissues for immunohistochemistry. Double staining with adenovirus-derived EGFP
and endogenous proteins were examined to verify orthotopic expression, i.e.
"adenovirus driven NPT2a-EGFP and endogenous NHE3 protein", "adenovirus driven
NKCC2-EGFP and endogenous NKCC2 protein" and "adenovirus driven AQP2-EGFP and
endogenous AQP2 protein". Owing to a lack of finding good working anti-NPT2a
antibody, an antibody against a different protein (sodium-hydrogen exchanger 3 or
NHE3) that is also specifically expressed in the proximal tubule was used. Kidney
structures were well-preserved, and other organ tissues did not show EGFP
staining. Our gene transfer method is easier than using genetically engineered
animals, and it confers the advantage of allowing the manipulation of gene
transfer after birth. This is the first method to successfully target gene
expression to specific cells in the kidney tubules. This study may serve as the
first step for safe and effective gene therapy in the kidney tubule diseases.