COMMD10

COMMD10 is a scaffold/regulatory protein that modulates NF-κB signaling, endosomal trafficking, inflammasome activity, and HIF1α stability across diverse cell types. COMMD10 binds the NF-κB subunit p65 and prevents its nuclear translocation, thereby suppressing NF-κB-driven transcription; this function is negatively regulated by FMNL2, which targets COMMD10 for ubiquitin–proteasome degradation (PMID:28817833). In hepatocellular carcinoma cells, COMMD10 physically associates with HIF1α to inhibit its ubiquitin-mediated degradation and nuclear entry, and loss of COMMD10 upregulates HIF1α-driven ceruloplasmin and SLC7A11 transcription, suppressing ferroptosis and promoting radioresistance (PMID:35101526). In myeloid cells, COMMD10 restrains caspase-1/caspase-11 inflammasome activation in Ly6Cʰⁱ monocytes, promotes TFEB-dependent phagolysosomal biogenesis through the CCC complex in macrophages, and is essential for the homeostatic survival of tissue-resident Kupffer cells (PMID:30487795, PMID:30959277, PMID:34788631).

1. 2017 High

   The first mechanistic link between COMMD10 and a signaling pathway was established: COMMD10 directly binds p65 and blocks its nuclear translocation, suppressing NF-κB activity, while FMNL2 negatively regulates this axis by driving COMMD10 ubiquitination and proteasomal degradation.

   Evidence Co-IP, GST pull-down, in vitro ubiquitination assay, dual-luciferase reporter, and nuclear fractionation in colorectal cancer cells

   PMID:28817833

   Open questions at the time

   • The E3 ubiquitin ligase recruited by FMNL2 to ubiquitinate COMMD10 was not identified
   • Whether other COMMD family members compensate for COMMD10 loss in NF-κB regulation is unknown
   • Physiological relevance outside CRC cells was not tested
2. 2018 Medium

   COMMD10 was placed at the intersection of endosomal trafficking and ion channel regulation: it positively regulates ENaC surface abundance by counteracting Nedd4-2-mediated ubiquitination and supporting transferrin endocytosis/recycling, and it restrains caspase-1/caspase-11 inflammasome activation in myeloid Ly6Cʰⁱ monocytes to maintain intestinal barrier integrity.

   Evidence Stable shRNA knockdown with Ussing chamber electrophysiology and transferrin recycling in epithelial cells; myeloid-specific conditional KO mice with caspase activity assays and DSS colitis model

   PMID:29997525 PMID:30487795

   Open questions at the time

   • Direct physical interaction between COMMD10 and Nedd4-2 was not demonstrated
   • The molecular mechanism by which COMMD10 suppresses caspase-1/caspase-11 activation was not defined
   • Whether ENaC regulation and inflammasome restraint share a common COMMD10-dependent trafficking mechanism is unknown
3. 2019 Medium

   COMMD10 was linked to the CCC complex and lysosomal biogenesis: in macrophages, COMMD10 deficiency impairs TFEB activation and reduces expression of CCC complex components, leading to defective phagolysosome maturation and impaired bacterial clearance.

   Evidence COMMD10-deficient macrophage and Kupffer cell models with TFEB activity assays, lysosomal markers, and S. aureus clearance

   PMID:30959277

   Open questions at the time

   • Whether COMMD10 directly activates TFEB or acts indirectly through CCC-dependent endosomal signaling is unresolved
   • Biochemical reconstitution of the COMMD10–CCC interaction has not been performed
   • Contribution of individual CCC subunits to the phenotype was not dissected
4. 2021 Medium

   The in vivo requirement for COMMD10 in tissue-resident macrophage homeostasis was established: its loss leads to Kupffer cell depletion, continuous monocyte replacement, aberrant inflammasome activation, and diminished type I interferon responses after liver injury.

   Evidence Conditional KO mice, flow cytometry, acetaminophen liver injury model, transcriptional profiling of monocyte differentiation

   PMID:34788631

   Open questions at the time

   • The upstream signal that maintains COMMD10 expression in tissue-resident macrophages is unknown
   • Whether the KC survival defect is cell-intrinsic or secondary to inflammasome hyperactivation was not fully resolved
   • Relevance to tissue-resident macrophages outside the liver was only partially explored
5. 2022 High

   A second major signaling axis was uncovered: COMMD10 physically associates with HIF1α, inhibits its ubiquitin-mediated degradation and nuclear translocation, and thereby controls HIF1α-driven transcription of ceruloplasmin and SLC7A11 to regulate ferroptosis and radioresistance in hepatocellular carcinoma.

   Evidence Co-IP, ubiquitination assay, glutathione/lipid peroxidation/Fe²⁺ assays, lentiviral overexpression/knockdown, in vivo mouse radiation models

   PMID:35101526

   Open questions at the time

   • How copper accumulation mechanistically counteracts the COMMD10–HIF1α interaction is not defined at the structural level
   • Whether COMMD10 regulation of HIF1α extends to non-malignant hypoxic tissues is untested
   • The E3 ligase whose activity COMMD10 opposes on HIF1α was not identified
6. 2023 Medium

   A developmental requirement was revealed: homozygous COMMD10 knockout causes embryonic lethality at E8.5 with severely reduced neural crest transcription factors including Sox10, establishing COMMD10 as essential for neural plate and neural crest development.

   Evidence Commd10 knockout mouse model with transcriptome analysis of E8.5 embryos

   PMID:36976102

   Open questions at the time

   • The signaling pathway through which COMMD10 controls neural crest gene expression is unknown
   • Whether the embryonic lethality is caused specifically by neural crest failure or broader developmental arrest is unclear
   • Cell-autonomous versus non-cell-autonomous roles in neural crest progenitors were not distinguished

• Structural and biochemical details of COMMD10's integration into the CCC complex, the identity of E3 ligases it opposes on HIF1α and ENaC pathways, and the mechanism linking COMMD10 to neural crest transcription factor expression remain unresolved.
• No crystal or cryo-EM structure of COMMD10 alone or in complex
• The direct enzymatic or adaptor mechanism by which COMMD10 opposes ubiquitination of its targets has not been reconstituted
• Integration of the NF-κB, HIF1α, inflammasome, and trafficking functions into a unified molecular model is lacking