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The role of tuberous sclerosis complex 1 in regulating innate immunity

Hongjie Pan1, Thomas F O'Brien, Ping Zhang

  • 1Department of Pediatrics--Allergy and Immunology, Duke University Medical Center, Durham, NC 27710, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|March 14, 2012
PubMed

Insights

Tuberous sclerosis complex 1 (TSC1) deficiency enhances Toll-like receptor (TLR) responses by activating mTORC1 and JNK1/2 pathways. This impairment in innate immunity also affects endotoxin tolerance, highlighting TSC1's regulatory role.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Mechanisms controlling Toll-like receptor (TLR)-induced responses, including endotoxin tolerance, are not fully understood.
  • Tuberous sclerosis complex 1 (TSC1) is a known tumor suppressor that inhibits the mammalian target of rapamycin (mTOR) pathway.

Purpose of the Study:

  • To investigate the role of TSC1 in regulating innate immune responses, particularly TLR-induced activation and endotoxin tolerance.
  • To elucidate the molecular pathways, specifically mTORC1 and JNK1/2, involved in TSC1-mediated regulation of innate immunity.

Main Methods:

  • Utilized macrophages with and without TSC1 deficiency.
  • Stimulated macrophages with various pathogen-associated molecular pattern (PAMP) ligands, including lipopolysaccharide (LPS).
  • Assessed activation of mTORC1, JNK1/2, and production of proinflammatory cytokines and nitric oxide (NO).
  • Employed chemical inhibitors and small hairpin RNA (shRNA) to modulate mTORC1 and JNK1/2 activity.
  • Evaluated endotoxin tolerance in vitro and in vivo.

Main Results:

  • TSC1 deficiency led to enhanced activation of mTORC1 and JNK1/2 in response to LPS.
  • TSC1-deficient macrophages exhibited elevated production of proinflammatory cytokines and NO upon stimulation with multiple TLR ligands.
  • Inhibition of mTORC1 and JNK1/2 reversed the enhanced TLR-induced responses in TSC1-deficient cells.
  • TSC1 deficiency also altered innate responses mediated by NOD and RIG-I/MDA-5.
  • Impaired induction of endotoxin tolerance was observed in TSC1-deficient models, linked to increased JNK1/2 activation.

Conclusions:

  • TSC1 acts as a negative regulator of innate immune responses, controlling TLR-induced activation through both mTORC1 and JNK1/2 pathways.
  • TSC1 deficiency compromises endotoxin tolerance, impacting the immune system's ability to dampen excessive inflammation.
  • These findings reveal a critical role for TSC1 in maintaining immune homeostasis and regulating innate immunity.

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