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2016 ; 6
(ä): 25955
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A novel podocyte gene, semaphorin 3G, protects glomerular podocyte from
lipopolysaccharide-induced inflammation
#MMPMID27180624
Ishibashi R
; Takemoto M
; Akimoto Y
; Ishikawa T
; He P
; Maezawa Y
; Sakamoto K
; Tsurutani Y
; Ide S
; Ide K
; Kawamura H
; Kobayashi K
; Tokuyama H
; Tryggvason K
; Betsholtz C
; Yokote K
Sci Rep
2016[May]; 6
(ä): 25955
PMID27180624
show ga
Kidney diseases including diabetic nephropathy have become huge medical problems,
although its precise mechanisms are still far from understood. In order to
increase our knowledge about the patho-physiology of kidney, we have previously
identified >300 kidney glomerulus-enriched transcripts through large-scale
sequencing and microarray profiling of the mouse glomerular transcriptome. One of
the glomerulus-specific transcripts identified was semaphorin 3G (Sema3G) which
belongs to the semaphorin family. The aim of this study was to analyze both the
in vivo and in vitro functions of Sema3G in the kidney. Sema3G was expressed in
glomerular podocytes. Although Sema3G knockout mice did not show obvious
glomerular defects, ultrastructural analyses revealed partially aberrant podocyte
foot processes structures. When these mice were injected with lipopolysaccharide
to induce acute inflammation or streptozotocin to induce diabetes, the lack of
Sema3G resulted in increased albuminuria. The lack of Sema3G in podocytes also
enhanced the expression of inflammatory cytokines including chemokine ligand 2
and interleukin 6. On the other hand, the presence of Sema3G attenuated their
expression through the inhibition of lipopolysaccharide-induced Toll like
receptor 4 signaling. Taken together, our results surmise that the Sema3G protein
is secreted by podocytes and protects podocytes from inflammatory kidney diseases
and diabetic nephropathy.