NDFIP1 limits cellular TAZ accumulation via exosomal sorting to inhibit NSCLC proliferation.

Yirui Cheng; Xin LU; Fan LI; Zhuo Chen; Yanshuang Zhang; Qing Han; Qingyu Zeng; Tingyu WU; Ziming LI; Shun LU; Cecilia Williams; Weiliang Xia

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NDFIP1 limits cellular TAZ accumulation via exosomal sorting to inhibit NSCLC proliferation.

Author: Yirui CHENG ¹ ; Xin LU ¹ ; Fan LI ¹ ; Zhuo CHEN ¹ ; Yanshuang ZHANG ¹ ; Qing HAN ¹ ; Qingyu ZENG ² ; Tingyu WU ¹ ; Ziming LI ³ ; Shun LU ³ ; Cecilia WILLIAMS ⁴ ; Weiliang XIA ¹
Author Information

1. State Key Laboratory of Oncogenes and Related Genes, Ren Ji Hospital, School of Medicine and School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, China.
2. Shanghai Skin Disease Hospital, Tongji University School of Medicine, Shanghai 200092, China.
3. Shanghai Lung Cancer Center, Shanghai Chest Hospital, Shanghai Jiao Tong University, Shanghai 200030, China.
4. Department of Protein Science, KTH Royal Institute of Technology, Science for Life Laboratory, Solna 170 70, Sweden.
Publication Type:Research Support, Non-U.S. Gov't
Keywords: NDFIP1; NSCLC; TAZ; cargo sorting; exosome
MeSH: Humans; Carcinoma, Non-Small-Cell Lung/metabolism*; Carrier Proteins/metabolism*; Cell Line; Cell Proliferation; Exosomes/metabolism*; Lung Neoplasms/genetics*; Membrane Proteins/metabolism*; Transcriptional Coactivator with PDZ-Binding Motif Proteins/metabolism*
From: Protein & Cell 2023;14(2):123-136
CountryChina
Language:English
Abstract: NDFIP1 has been previously reported as a tumor suppressor in multiple solid tumors, but the function of NDFIP1 in NSCLC and the underlying mechanism are still unknown. Besides, the WW domain containing proteins can be recognized by NDFIP1, resulted in the loading of the target proteins into exosomes. However, whether WW domain-containing transcription regulator 1 (WWTR1, also known as TAZ) can be packaged into exosomes by NDFIP1 and if so, whether the release of this oncogenic protein via exosomes has an effect on tumor development has not been investigated to any extent. Here, we first found that NDFIP1 was low expressed in NSCLC samples and cell lines, which is associated with shorter OS. Then, we confirmed the interaction between TAZ and NDFIP1, and the existence of TAZ in exosomes, which requires NDFIP1. Critically, knockout of NDFIP1 led to TAZ accumulation with no change in its mRNA level and degradation rate. And the cellular TAZ level could be altered by exosome secretion. Furthermore, NDFIP1 inhibited proliferation in vitro and in vivo, and silencing TAZ eliminated the increase of proliferation caused by NDFIP1 knockout. Moreover, TAZ was negatively correlated with NDFIP1 in subcutaneous xenograft model and clinical samples, and the serum exosomal TAZ level was lower in NSCLC patients. In summary, our data uncover a new tumor suppressor, NDFIP1 in NSCLC, and a new exosome-related regulatory mechanism of TAZ.