Loss of Smad4 promotes aggressive lung cancer metastasis by de-repression of PAK3 via miRNA regulation
Abstract SMAD4 is mutated in human lung cancer, but the underlying mechanism by which Smad4 loss-of-function (LOF) accelerates lung cancer metastasis is yet to be elucidated. Here, we generate a highly aggressive lung cancer mouse model bearing conditional Kras G12D , p53 fl/fl LOF and Smad4 fl/fl L...
Saved in:
Published in | Nature communications Vol. 12; no. 1; pp. 1 - 11 |
---|---|
Main Authors | , , , , , , , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
London
Nature Publishing Group
11.08.2021
Nature Publishing Group UK Nature Portfolio |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | Abstract
SMAD4 is mutated in human lung cancer, but the underlying mechanism by which Smad4 loss-of-function (LOF) accelerates lung cancer metastasis is yet to be elucidated. Here, we generate a highly aggressive lung cancer mouse model bearing conditional
Kras
G12D
,
p53
fl/fl
LOF and
Smad4
fl/fl
LOF mutations (SPK), showing a much higher incidence of tumor metastases than the
Kras
G12D
,
p53
fl/fl
(PK) mice. Molecularly, PAK3 is identified as a downstream effector of Smad4, mediating metastatic signal transduction via the PAK3-JNK-Jun pathway. Upregulation of PAK3 by Smad4 LOF in SPK mice is achieved by attenuating Smad4-dependent transcription of miR-495 and miR-543. These microRNAs (miRNAs) directly bind to the PAK3 3′UTR for blockade of PAK3 production, ultimately regulating lung cancer metastasis. An inverse correlation between Smad4 and PAK3 pathway components is observed in human lung cancer. Our study highlights the Smad4-PAK3 regulation as a point of potential therapy in metastatic lung cancer. |
---|---|
ISSN: | 2041-1723 2041-1723 |
DOI: | 10.1038/s41467-021-24898-9 |