RHBDL4-triggered downregulation of COPII adaptor protein TMED7 suppresses TLR4-mediated inflammatory signaling

Julia D. Knopf, Susanne S. Steigleder, Friederike Korn, Nathalie Kühnle, Marina Badenes, Marina Tauber, Sebastian J. Theobald, Jan Rybniker, Colin Adrain and Marius K. Lemberg ()
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Julia D. Knopf: Center for Molecular Biology of Heidelberg University (ZMBH)
Susanne S. Steigleder: Center for Molecular Biology of Heidelberg University (ZMBH)
Friederike Korn: Center for Molecular Biology of Heidelberg University (ZMBH)
Nathalie Kühnle: Center for Molecular Biology of Heidelberg University (ZMBH)
Marina Badenes: Instituto Gulbenkian de Ciência (IGC)
Marina Tauber: University of Cologne
Sebastian J. Theobald: University of Cologne
Jan Rybniker: University of Cologne
Colin Adrain: Instituto Gulbenkian de Ciência (IGC)
Marius K. Lemberg: Center for Molecular Biology of Heidelberg University (ZMBH)

Nature Communications, 2024, vol. 15, issue 1, 1-13

Abstract: Abstract The toll-like receptor 4 (TLR4) is a central regulator of innate immunity that primarily recognizes bacterial lipopolysaccharide cell wall constituents to trigger cytokine secretion. We identify the intramembrane protease RHBDL4 as a negative regulator of TLR4 signaling. We show that RHBDL4 triggers degradation of TLR4’s trafficking factor TMED7. This counteracts TLR4 transport to the cell surface. Notably, TLR4 activation mediates transcriptional upregulation of RHBDL4 thereby inducing a negative feedback loop to reduce TLR4 trafficking to the plasma membrane. This secretory cargo tuning mechanism prevents the over-activation of TLR4-dependent signaling in an in vitro Mycobacterium tuberculosis macrophage infection model and consequently alleviates septic shock in a mouse model. A hypomorphic RHBDL4 mutation linked to Kawasaki syndrome, an ill-defined inflammatory disorder in children, further supports the pathophysiological relevance of our findings. In this work, we identify an RHBDL4-mediated axis that acts as a rheostat to prevent over-activation of the TLR4 pathway.

Date: 2024
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DOI: 10.1038/s41467-024-45615-2

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