WNT5A-RHOASignaling Is a Driver of Tumorigenesis and Represents a Therapeutically Actionable Vulnerability in Small Cell Lung Cancer

Kee Beom Kim, Dong Wook Kim, Youngchul Kim, Jun Tang, Nicole Kirk, Yongyu Gan, Bongjun Kim, Bingliang Fang, Jae Ll Park, Yi Zheng, Kwon Sik Park

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

WNT signaling represents an attractive target for cancer therapy due to its widespread oncogenic role. However, the molecular players involved in WNT signaling and the impact of their perturbation remain unknown for numerous recalcitrant cancers. Here, we characterize WNT pathway activity in small cell lung cancer (SCLC) and determine the functional role of WNT signaling using genetically engineered mouse models. b-Catenin, a master mediator of canonical WNT signaling, was dispensable for SCLC development, and its transcriptional program was largely silenced during tumor development. Conversely, WNT5A, a ligand for b-catenin- independent noncanonical WNT pathways, promoted neoplastic transformation and SCLC cell proliferation, whereas WNT5A deficiency inhibited SCLC development. Loss of p130 in SCLC cells induced expression of WNT5A, which selectively increased Rhoa transcription and activatedRHOAprotein to drive SCLC. Rhoa knockout suppressed SCLC development in vivo, and chemical perturbation of RHOA selectively inhibited SCLC cell proliferation. These findings suggest a novel requirement for theWNT5A-RHOA axis in SCLC, providing critical insights for the development of novel therapeutic strategies for this recalcitrant cancer. This study also sheds light on the heterogeneity ofWNT signaling in cancer and the molecular determinants of its cell-type specificity.

Original languageEnglish
Pages (from-to)4219-4233
Number of pages15
JournalCancer Research
Volume82
Issue number22
DOIs
StatePublished - 15 Nov 2022

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