N-(3-oxo-acyl) homoserine lactone induced germ cell apoptosis and suppressed the over-activated RAS/MAPK tumorigenesis via mitochondrial-dependent ROS in C. elegans
Tóm tắt
As a quorum-sensing molecule for bacteria–bacteria communication, N-(3-oxododecanoyl)-homoserine lactone (C12) has been found to possess pro-apoptotic activities in various cell culture models. However, the detailed mechanism of how this important signaling molecule function in the cells of live animals still remains largely unclear. In this study, we systematically investigated the mechanism for C12-mediated apoptosis and studied its anti-tumor effect in Caenorhabditis elegans (C. elegans). Our data demonstrated that C12 increased C. elegans germ cell apoptosis, by triggering mitochondrial outer membrane permeabilization (MOMP) and elevating the reactive oxygen species (ROS) level. Importantly, C12-induced ROS increased the expression of genes critical for DNA damage response (hus-1, clk-2 and cep-1) and genes involved in p38 and JNK/MAPK signaling pathway (nsy-1, sek-1, pmk-1, mkk-4 and jnk-1). Furthermore, C12 failed to induce germ cell apoptosis in animals lacking the expression of each of those genes. Finally, in a C. elegans tumor-like symptom model, C12 significantly suppressed tumor growth through inhibiting the expression of RAS/MAPK pathway genes (let-23/EGFR, let-60/RAS, lin-45/RAF, mek-2/MEK and mpk-1/MAPK). Overall, our results indicate that DNA damage response and MAPK activation triggered by mitochondrial ROS play important roles in C12-induced apoptotic signaling in C. elegans, and RAS/MAPK suppression is involved in the tumor inhibition effect of C12. This study provides in vivo evidence that C12 is a potential candidate for cancer therapeutics by exerting its pro-apoptotic and anti-tumor effects via elevating mitochondria-dependent ROS production.
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