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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.
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When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...
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Diversity in Cell Signaling Responses

The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity. 
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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...
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Signaling pathways perturbing muscle mass.

David J Glass1

  • 1Novartis Institutes for Biomedical Research, Cambridge, MA 02139, USA. david.glass@novartis.com

Current Opinion in Clinical Nutrition and Metabolic Care
|April 20, 2010
PubMed
Summary

Cachexia involves muscle wasting due to increased protein breakdown, particularly myosin heavy chain. Understanding pathways involving MuRF1, MAFbx, and insulin-like growth factor-1 offers new therapeutic strategies for muscle loss.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Physiology

Background:

  • Cachexia is characterized by irreversible lean body mass wasting, signaling a breakdown in body composition regulation.
  • Skeletal muscle in cachexia exhibits increased protein degradation, marked by the upregulation of E3 ubiquitin ligases MuRF1 and MAFbx (Atrogin-1).

Purpose of the Study:

  • To elucidate the molecular mechanisms driving muscle loss in cachexia.
  • To identify key pathways and proteins involved in skeletal muscle wasting.

Main Methods:

  • Review of transcriptional markers for muscle atrophy.
  • Analysis of the roles of E3 ubiquitin ligases (MuRF1, MAFbx) and signaling pathways (IGF-1/PI3K/Akt/Foxo).

Main Results:

  • MuRF1 and MAFbx target sarcomeric proteins, like myosin heavy chain, for degradation via the ubiquitin-proteasome system.
  • Insulin-like growth factor-1 (IGF-1) inhibits MuRF1/MAFbx upregulation through the PI3K/Akt/Foxo pathway, preserving muscle proteins.
  • IGF-1 signaling also counteracts myostatin, a potent inhibitor of muscle growth, highlighting a critical regulatory axis.

Conclusions:

  • Understanding these molecular pathways provides a foundation for developing targeted treatments for cachexia.
  • Interventions aimed at modulating IGF-1 signaling or inhibiting myostatin show promise for combating muscle wasting.