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Aberrant expression of transglutaminase 2 in pancreas and thymus of NOD mice underscores the importance of deamidation in neoantigen generation.

ABSTRACT: Post-translational modifications can lead to a break in immune tolerance in autoimmune diseases such as type 1 diabetes (T1D). Deamidation, the conversion of glutamine to glutamic acid by transglutaminase (TGM) enzymes, is a post-translational modification of interest, with deamidated peptides being reported as autoantigens in T1D. However, little is known about how Tgm2, the most ubiquitously expressed Tgm isoform, is regulated and how tolerance against deamidated peptides is lost. Here, we report on the aberrant expression and regulation of Tgm2, in the pancreas and thymus of NOD mice. We demonstrate that Tgm2 expression is induced by the inflammatory cytokines IL1β and IFNγ in a synergistic manner and that murine pancreatic islets of NOD mice have higher Tgm2 levels, while Tgm2 levels in thymic mTECs are reduced. We thus provide the first direct evidence to our knowledge that central tolerance establishment against deamidated peptides might be impaired due to lower Tgm2 expression in NOD mice, which together with the aberrantly high levels of deamidated peptides in NOD β-cells underscores the role of deamidation in amplifying T-cell reactivity.

INSTRUMENT(S): Q Exactive

ORGANISM(S): Mus Musculus (mouse)

SUBMITTER: Aisha Callebaut

LAB HEAD: Chantal Mathieu

PROVIDER: PXD034102 | Pride | 2022-07-21

REPOSITORIES: Pride

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			Action	DRS
	Bl6_10w_1.msf	Msf
	Bl6_10w_1.raw	Raw
	Bl6_10w_2.msf	Msf
	Bl6_10w_2.raw	Raw
	Bl6_10w_3.msf	Msf

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