Regulation of RIPK1 Phosphorylation: Implications for Inflammation, Cell Death, and Therapeutic Interventions

Jingchun Du1, Zhigao Wang2

  • 1Department of Clinical Immunology, Kingmed School of Laboratory Medicine, Guangzhou Medical University, Guangzhou 510182, China.

Biomedicines
|July 27, 2024
PubMed

Insights

Receptor-interacting protein kinase 1 (RIPK1) regulates cell death and inflammation. Understanding its phosphorylation is key to developing new therapies for inflammatory diseases.

Area of Science:

  • Molecular biology
  • Immunology
  • Cellular signaling

Background:

  • Receptor-interacting protein kinase 1 (RIPK1) is a key regulator of cell death and inflammation.
  • RIPK1 activity is modulated by post-translational modifications, particularly phosphorylation.
  • Dysregulated RIPK1 phosphorylation is implicated in severe human inflammatory diseases.

Purpose of the Study:

  • To review the complex regulation of RIPK1 phosphorylation and dephosphorylation.
  • To highlight the therapeutic potential of targeting RIPK1 phosphorylation in disease.

Main Methods:

  • Literature review of studies on RIPK1 signaling pathways.
  • Analysis of post-translational modifications of RIPK1.
  • Exploration of the role of RIPK1 in inflammatory and cell death processes.

Main Results:

  • RIPK1 phosphorylation dynamically controls its switch between cell survival and cell death.
  • Specific phosphorylation sites on RIPK1 exert activating or inhibitory effects on its function.
  • Aberrant RIPK1 phosphorylation patterns are linked to various inflammatory pathologies.

Conclusions:

  • Targeting RIPK1 phosphorylation represents a promising therapeutic avenue for inflammatory diseases.
  • Further research into RIPK1 phosphorylation dynamics can uncover novel treatment strategies.

Related Concept Videos

Regulation of the Unfolded Protein Response01:31

Regulation of the Unfolded Protein Response

Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
2.4K
PI3K/mTOR/AKT Signaling Pathway01:22

PI3K/mTOR/AKT Signaling Pathway

The mammalian target of rapamycin  (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1  (mTORC1) and mTOR complex 2  (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast,  mTORC2 consists of a...
3.5K
The JAK-STAT Signaling Pathway01:20

The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
8.8K
The Extrinsic Apoptotic Pathway01:17

The Extrinsic Apoptotic Pathway

The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
6.3K
Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
6.2K
MAPK Signaling Cascades01:07

MAPK Signaling Cascades

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...
5.3K