학술논문
MYC-driven synthesis of Siglec ligands is a glycoimmune checkpoint
Document Type
Academic Journal
Author
Smith, Benjamin A.H.; Deutzmann, Anja; Correa, Kristina M.; Delaveris, Corleone S.; Dhanasekaran, Renumathy; Dove, Christopher G.; Sullivan, Delaney K.; Wisnovsky, Simon; Stark, Jessica C.; Pluvinage, John V.; Swaminathan, Srividya; Riley, Nicholas M.; Rajan, Anand; Majeti, Ravindra; Felsher, Dean W.; Bertozzi, Carolyn R.
Source
Proceedings of the National Academy of Sciences of the United States. March 14, 2023, Vol. 120 Issue 11, p1o, 12 p.
Subject
Language
English
ISSN
0027-8424
Abstract
The Siglecs (sialic acid-binding immunoglobulin-like lectins) are glycoimmune checkpoint receptors that suppress immune cell activation upon engagement of cognate sialoglycan ligands. The cellular drivers underlying Siglec ligand production on cancer cells are poorly understood. We find the MYC oncogene causally regulates Siglec ligand production to enable tumor immune evasion. A combination of glycomics and RNA-sequencing of mouse tumors revealed the MYC oncogene controls expression of the sialyltransferase St6galnac4 and induces a glycan known as disialyl-T. Using in vivo models and primary human leukemias, we find that disialyl-T functions as a 'don't eat me' signal by engaging macrophage Siglec-E in mice or the human ortholog Siglec-7, thereby preventing cancer cell clearance. Combined high expression of MYC and ST6GALNAC4 identifies patients with high-risk cancers and reduced tumor myeloid infiltration. MYC therefore regulates glycosylation to enable tumor immune evasion. We conclude that disialyl-T is a glycoimmune checkpoint ligand. Thus, disialyl-T is a candidate for antibody-based checkpoint blockade, and the disialyl-T synthase ST6GALNAC4 is a potential enzyme target for small molecule-mediated immune therapy. glycosylation | MYC | oncogene | Siglec