Regulation of inflammatory signaling by the ST6Gal-I sialyltransferase.

ABSTRACT: The ST6Gal-I sialyltransferase, an enzyme that adds α2-6-linked sialic acids to N-glycosylated proteins, regulates multiple immunological processes. However, the contribution of receptor sialylation to inflammatory signaling has been under-investigated. In the current study, we uncovered a role for ST6Gal-I in promoting sustained signaling through two prominent inflammatory pathways, NFκB and JAK/STAT. Using the U937 monocytic cell model, we determined that knockdown (KD) of ST6Gal-I expression had no effect on the rapid activation of NFκB by TNF (≤ 30 min), whereas long-term TNF-induced NFκB activation (2-6 hr) was diminished in ST6Gal-I-KD cells. These data align with prior work in epithelial cells showing that α2-6 sialylation of TNFR1 prolongs TNF-dependent NFκB activation. Similar to

SUBMITTER: Holdbrooks AT 

PROVIDER: S-EPMC7652342 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature