Mechanisms of drug inhibition of signalling molecules

Judith S Sebolt-Leopold1, Jessie M English

  • 1Pfizer Global Research and Development, Michigan Laboratories, 2800 Plymouth Road, Ann Arbor, Michigan 48105, USA.

Nature
|May 26, 2006
PubMed

Insights

New molecularly targeted cancer therapies offer a paradigm shift, moving away from non-specific drugs. Despite challenges in targeting complex pathways, these emerging agents show significant therapeutic advances against various human cancers.

Area of Science:

  • Oncology
  • Pharmacology
  • Molecular Biology

Background:

  • Cancer therapy is shifting towards molecularly targeted agents, reducing reliance on traditional cytotoxic drugs.
  • The development of novel anticancer drugs targeting specific molecular pathways represents a significant advancement.
  • Challenges remain in understanding and targeting the complex signal-transduction pathways involved in cancer.

Purpose of the Study:

  • To highlight the paradigm shift in cancer therapy driven by molecularly targeted agents.
  • To discuss the challenges and advances in designing effective treatment regimens for emerging anticancer drugs.
  • To underscore the therapeutic potential of novel agents despite uncertainties in their precise mechanisms of action.

Main Methods:

  • Review of emerging molecularly targeted agents in cancer therapy.
  • Analysis of signal-transduction pathways implicated in cancer treatment.
  • Evaluation of therapeutic advances and challenges associated with novel anticancer compounds.

Main Results:

  • Molecularly targeted agents represent a paradigm shift, minimizing damage to healthy cells.
  • Expanded diversity of targets for new-generation anticancer drugs.
  • Significant therapeutic advances observed across a broad spectrum of human cancers.

Conclusions:

  • Emerging targeted agents are revolutionizing cancer treatment paradigms.
  • Despite complexities in targeting multiple pathways, these agents demonstrate considerable efficacy.
  • Continued research into molecular mechanisms will further optimize personalized cancer therapy.

Related Concept Videos

Enzyme Inhibition01:30

Enzyme Inhibition

Inhibitors are molecules that reduce enzyme activity by binding to the enzyme. In a normally functioning cell, enzymes are regulated by a variety of inhibitors. Drugs and other toxins can also inhibit enzymes. Some inhibitors bind to the enzyme’s active site, while others inhibit enzymatic activity by binding to other sites on the protein structure.
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...
Amplifying Signals via Enzymatic Cascade01:22

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...
Drug-Receptor Interactions01:29

Drug-Receptor Interactions

Drug-receptor interaction describes the binding of receptors by drugs, but not all drug-receptor interactions result in activation and tissue response. For instance, the binding of agonists activates the receptor to generate a cellular reaction, while antagonists bind to receptors without causing their activation.
Several parameters, such as the drug's affinity for its receptor and its efficacy, which is its ability to activate the receptor, determine the drug's effect on the tissue.
Targets for Drug Action: Overview01:26

Targets for Drug Action: Overview

Drugs target macromolecules to modify ongoing cellular processes. Primary drug targets include receptors, ion channels, transporters, and enzymes.
Receptors are either membrane-spanning or intracellular proteins, which upon binding a ligand, get activated and transmit the signal downstream to elicit a response. Drugs bind receptors, either mimicking the action of endogenous ligands or blocking the receptor activity to bring about a modified response. Nearly 35% of approved drugs target the G...
Neurochemical Transmission: Sites of Drug Action01:26

Neurochemical Transmission: Sites of Drug Action

Neurochemical transmission, the conduction of electrical impulses between neurons mediated by neurotransmitters, plays a vital role in various physiological processes. Autonomic drugs exert their effects by modulating neurotransmission within the autonomic nervous system. For instance, drugs such as hemicholinium block the precursor uptake necessary for synthesizing acetylcholine, an essential autonomic neurotransmitter. Following synthesis, neurotransmitters are stored in vesicles. Metyrosine...