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Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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Another face of RIPK1.

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Receptor-interacting protein kinase-1 (RIPK1) regulates cell death pathways. New research reveals RIPK1 also inhibits autophagy by phosphorylating the transcription factor TFEB, impacting cellular regulation.

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Area of Science:

  • Cellular signaling pathways
  • Molecular biology
  • Cell death regulation

Background:

  • Receptor-interacting protein kinase-1 (RIPK1) is a key regulator of apoptosis and necroptosis.
  • Understanding RIPK1's diverse roles is crucial for deciphering cell fate decisions.

Purpose of the Study:

  • To investigate a novel function of RIPK1 in the regulation of autophagy.
  • To elucidate the mechanism by which RIPK1 influences autophagy.

Main Methods:

  • Investigated RIPK1's role in autophagy.
  • Examined the phosphorylation of transcription factor TFEB by RIPK1.
  • Utilized ERK signaling pathway analysis.

Main Results:

  • RIPK1 inhibits autophagy.
  • This inhibition occurs through ERK-mediated phosphorylation of TFEB.
  • Identified a new regulatory mechanism for autophagy.

Conclusions:

  • RIPK1 plays a previously unrecognized role in suppressing autophagy.
  • The RIPK1-ERK-TFEB axis represents a new regulatory pathway for autophagy.
  • This finding expands our understanding of RIPK1 signaling networks.