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biochemie@vetmed.fu-berlin.de
Monocytes, a type of leukocytes, are key players in immune responses, transitioning to macrophages at infection sites. Differentiation, which is crucial for macrophage survival and resistance to apoptosis, is a tightly regulated process. Based on our earlier findings implicating the 5′-fragment of tRNAHisGUG (5′-HisGUG) in macrophage biology, we specifically focused on these fragments to investigate its regulation during monocyte-to-macrophage differentiation and its role in macrophage survival. We performed small RNA sequencing during monocyte-to-macrophage differentiation using THP-1 cells and identified 5′-HisGUG as a prominently regulated tDR. Notably, transfection of 5′-HisGUG in macrophages decreased survival under apoptotic stress. We propose that 5′-HisGUG can also act as an obstructive RNA (oRNA), and its reduction is critical for macrophage survival under stress.