Phenotype

Enzyme

Glycolysis

Macrophage

Biology

Gene

Warburg effect

PKM2

Kinase

Chemistry

In vitro

Immunology

Inflammation

Pyruvate kinase

Tetramer

Cell biology

Biochemistry

International Journal of Biological Sciences

Emerging evidence suggests that metabolic adaptation is a vital hallmark and prerequisite for macrophage phenotype transition.Pyruvate kinase M2 (PKM2) is an essential molecular determinant of metabolic adaptions in pro-inflammatory macrophages.Post-translational modifications play a central role in the regulation of PKM2.However, doubt remains on whether lactylation in PKM2 exists and how lactylation modulates the function of PKM2.For the first time, our study reports that lactate inhibits the Warburg effect by activating PKM2, promoting the transition of pro-inflammatory macrophages towards a reparative phenotype.We identify PKM2 as a lactylation substrate and confirm that lactylation occurs mainly at the K62 site.We find that lactate increases the lactylation level of PKM2, which inhibits its tetramer-to-dimer transition, promoting its pyruvate kinase activity and reducing nuclear distribution.In short, our study reports a novel post-translational modification type in PKM2 and clarifies its potential role in regulating inflammatory metabolic adaptation in pro-inflammatory macrophages.

Lactylation of PKM2 Suppresses Inflammatory Metabolic Adaptation in Pro-inflammatory Macrophages