Related Experiment Video

Updated: Jun 2, 2026

Identification of Mediators of T-cell Receptor Signaling via the Screening of Chemical Inhibitor Libraries
08:49

Identification of Mediators of T-cell Receptor Signaling via the Screening of Chemical Inhibitor Libraries

Published on: January 22, 2019

Small-molecule inhibitors of the PI3K signaling network

Colleen R McNamara1, Alexei Degterev

  • 1Department of biochemistry, Tufts University School of Medicine, 136 Harrison Ave., Boston, MA 02111, USA.

Future Medicinal Chemistry
|April 30, 2011
PubMed

Insights

The phosphoinositide 3-kinase (PI3K) pathway regulates cell functions and is crucial in diseases like cancer. This review summarizes PI3K signaling, inhibition strategies, and novel Akt-independent pathways targeting phosphatidylinositol-(3,4,5)-trisphosphate.

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The phosphoinositide 3-kinase (PI3K) pathway is vital for cellular processes like survival, migration, and metabolism.
  • Dysregulation of PI3K signaling, particularly via Akt kinase, is linked to human diseases such as cancer, inflammation, and metabolic disorders.
  • This pathway is a key target for therapeutic drug development.

Purpose of the Study:

  • To provide a comprehensive summary of the PI3K signaling network.
  • To discuss current strategies for inhibiting the PI3K pathway.
  • To explore the significance of Akt-independent PI3K signaling and novel inhibition approaches.

Main Methods:

  • Literature review and synthesis of current research on PI3K signaling.
  • Analysis of established and emerging PI3K pathway inhibition strategies.
  • Discussion of therapeutic targeting of PI3K pathway effectors.

Main Results:

  • The PI3K pathway is a complex network regulating fundamental cellular activities.
  • Akt-dependent signaling is a well-established target, but Akt-independent pathways are gaining relevance.
  • Inhibiting the interaction between PI3K products and effector domains presents a novel therapeutic avenue.

Conclusions:

  • Understanding the PI3K network is critical for disease intervention.
  • Targeting PI3K offers significant therapeutic potential, with both Akt-dependent and independent strategies being explored.
  • Future research should focus on harnessing Akt-independent pathways for enhanced therapeutic outcomes.

More Related Videos

A Bilingual Computational Workflow for Identifying Potential PLK1 Inhibitors in American Sign Language and English14:34

A Bilingual Computational Workflow for Identifying Potential PLK1 Inhibitors in American Sign Language and English

Published on: April 3, 2026

Related Concept Videos

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 rapamycin-insensitive companion...
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...
Phosphoinositides and PIPs01:42

Phosphoinositides and PIPs

Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
Inhibition of CDK Activity02:34

Inhibition of CDK Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
IP3/DAG Signaling Pathway01:11

IP3/DAG Signaling Pathway

Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and produces two-second...