[No authors listed]
Caenorhabditis elegans is a useful animal model to determine the underlying mechanism for the response to simulated microgravity. In this study, we employed C. elegans as an animal model to investigate the role of lipid metabolic sensors in regulating the response to simulated microgravity. Among the lipid metabolic sensors, simulated microgravity treatment could increase the expressions of sbp-1 and mdt-15. knockdown of sbp-1 or mdt-15 induced a susceptibility to toxicity of simulated microgravity, suggesting the alteration in SBP-1 and MDT-1 mediated a protective response to simulated microgravity. Tissue-specific activity analysis demonstrated that both MDT-15 and SBP-1 could act in the intestine to regulate the response to simulated microgravity. Genetic interaction analysis further indicated that intestinal MDT-15 acted upstream of SBP-1 to regulate the response to simulated microgravity. During the control of response to simulated microgravity, fatty acyl CoA desaturase FAT-6 was identified as the downstream target of intestinal SBP-1. Therefore, the identified signaling cascade of MDT-15-SBP-1-FAT-6 suggested the important function of lipid metabolic sensors in mediating a novel intestinal signaling pathway to regulate the response to simulated microgravity in nematodes.
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