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2017 ; 21
(11
): 2732-2747
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LncRNA MALAT1 is dysregulated in diabetic nephropathy and involved in high
glucose-induced podocyte injury via its interplay with ?-catenin
#MMPMID28444861
Hu M
; Wang R
; Li X
; Fan M
; Lin J
; Zhen J
; Chen L
; Lv Z
J Cell Mol Med
2017[Nov]; 21
(11
): 2732-2747
PMID28444861
show ga
Metastasis associated lung adenocarcinoma transcript 1(MALAT1) is a long
non-coding RNA, broadly expressed in mammalian tissues including kidney and
up-regulated in a variety of cancer cells. To date, its functions in podocytes
are largely unknown. ?-catenin is a key mediator in the canonical and
non-canonical Wnt signalling pathway; its aberrant expression promotes podocyte
malfunction and albuminuria, and contributes to kidney fibrosis. In this study,
we found that MALAT1 levels were increased in kidney cortices from C57BL/6 mice
with streptozocin (STZ)-induced diabetic nephropathy, and dynamically regulated
in cultured mouse podocytes stimulated with high glucose, which showed a trend
from rise to decline. The decline of MALAT1 levels was accompanied with ?-catenin
translocation to the nuclei and enhanced expression of serine/arginine splicing
factor 1 (SRSF1), a MALAT1 RNA-binding protein. Further we showed early
interference with MALAT1 siRNA partially restored podocytes function and
prohibited ?-catenin nuclear accumulation and SRSF1 overexpression. Intriguingly,
we showed that ?-catenin was involved in MALAT1 transcription by binding to the
promotor region of MALAT1; ?-catenin knock-down also decreased MALAT1 levels,
suggesting a novel feedback regulation between MALAT1 and ?-catenin. Notably,
?-catenin deletion had limited effects on SRSF1 expression, demonstrating
?-catenin might serve as a downstream signal of SRSF1. These findings provided
evidence for a pivotal role of MALAT1 in diabetic nephropathy and high
glucose-induced podocyte damage.