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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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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...
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Amplifying Signals via Second Messengers

Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
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Amplifying Signals via Enzymatic Cascade

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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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...
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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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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 rapamycin-insensitive companion...

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AKT/PKB signaling: navigating downstream.

Brendan D Manning1, Lewis C Cantley

  • 1Department of Genetics and Complex Diseases, Harvard School of Public Health, SPH2-117, Boston, MA 02115, USA. bmanning@hsp.harvard.edu

Cell
|July 3, 2007
PubMed
Summary
This summary is machine-generated.

The serine/threonine kinase Akt (protein kinase B) is crucial for cell signaling and implicated in diseases like cancer and diabetes. This review details Akt

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Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Biochemistry

Background:

  • The serine/threonine kinase Akt (also known as protein kinase B or PKB) is a critical signaling molecule.
  • Akt acts as a central hub for cellular responses to external stimuli like growth factors and cytokines.
  • Dysregulation of Akt signaling is linked to various complex diseases, including type-2 diabetes and cancer.

Purpose of the Study:

  • To review the molecular characteristics of Akt.
  • To discuss methods for identifying Akt's cellular targets.
  • To explore Akt substrates involved in key cellular functions.

Main Methods:

  • Literature review of Akt molecular properties.
  • Analysis of studies characterizing Akt cellular targets.
  • Discussion of established and putative Akt substrates.

Main Results:

  • Akt is a key mediator of cell survival, growth, proliferation, angiogenesis, metabolism, and migration.
  • Various molecular approaches are employed to identify Akt targets.
  • Specific Akt substrates are highlighted for their roles in cellular processes.

Conclusions:

  • Understanding Akt's molecular properties and targets is essential for comprehending its role in health and disease.
  • Akt's diverse substrates underscore its central role in regulating fundamental cellular activities.
  • Further research into Akt signaling pathways may reveal therapeutic strategies for diseases like cancer and diabetes.