Acetylation of Checkpoint suppressor 1 enhances its stability and promotes the progression of triple-negative breast cancer

Abstract

Checkpoint suppressor 1 (CHES1), a transcriptional regulator, had been dysregulated in many types of malignancies including breast cancer, and its expression level is strongly associated with progression and prognosis of patients. However, the underlying regulatory mechanisms of CHES1 expression in the breast cancer and the effects of post-translational modifications (PTMs) on its functional performance remain to be fully investigated. Herein, we found that CHES1 had a high abundance in triple-negative breast cancer (TNBC) and its expression was tightly associated with malignant phenotype and poor outcomes of patients. Furthermore, we confirmed that CHES1 was an acetylated protein and its dynamic modification was mediated by p300 and HDAC1, and CHES1 acetylation enhanced its stability via decreasing its ubiquitination and degradation, which resulted in the high abundance of CHES1 in TNBC. RNA-seq and functional study revealed that CHES1 facilitated the activation of oncogenic genes and pathways leading to proliferation and metastasis of TNBC. Taken together, this research established a novel regulatory role of acetylation on the stability and activity of CHES1. The results demonstrate the significance of CHES1 acetylation and underlying mechanisms in the progression of TNBC, offering new potential candidate for molecular-targeted therapy in breast cancer.

The Interplay of Acetylation and Ubiquitination Controls PRMT1 Homeostasis

“…This technological step forward enables the robust validation and mechanistic understanding of the impact of acetylation on protein half-life and opens new realms of exploration into the control of protein homeostasis. Notable examples, such as ACLY (Lin et al, 2013), exist where acetylation and ubiquitination are mutually exclusive at the same lysine (Choi et al, 2017; Perez-Oquendo et al, 2023; Xu et al, 2022; Yang et al, 2023; Zhang et al, 2023a). However, there are only scarce reports of lysine acetylation inducing ubiquitination (Jiang et al, 2011; Lai et al ., 2017; Van Nguyen et al, 2016).…”