Modulation of signal-transduction pathways by chemopreventive agents

M M Manson1, K A Holloway, L M Howells

  • 1MRC Toxicology Unit, University of Leicester, UK.

Insights

Certain dietary compounds and drugs like aspirin can modulate cell signaling pathways involved in cancer. These interventions may help restore normal cell proliferation and apoptosis, offering potential cancer prevention strategies.

Area of Science:

  • Molecular biology
  • Cellular signaling
  • Cancer research

Background:

  • Cancer involves accumulated alterations in normal cell function, particularly in cell-signaling pathways regulating proliferation and apoptosis.
  • Understanding these complex signaling networks reveals opportunities for therapeutic intervention.

Purpose of the Study:

  • To explore how various molecules, including drugs and dietary compounds, can beneficially interact with deregulated cell signaling pathways in cancer.
  • To investigate the potential of targeting specific pathways to restore normal cellular processes.

Main Methods:

  • Review of existing literature on molecular modulators of cell signaling.
  • Analysis of how non-steroidal anti-inflammatory drugs and natural plant compounds affect kinase activity and phosphorylation.
  • Examination of pathways such as nuclear factor kappaB, growth factor signaling, and stress-activated protein kinase pathways (c-Jun N-terminal kinase, p38).

Main Results:

  • Non-steroidal anti-inflammatory drugs and natural compounds from green vegetables and tea can modulate kinase activity and phosphorylation.
  • These agents impact key signaling pathways including NF-κB, growth factor receptor/ERK, JNK, and p38 pathways.
  • In vitro evidence suggests dietary compounds can target these pathways to normalize abnormal proliferation and apoptosis.

Conclusions:

  • Modulation of deregulated cell signaling pathways by drugs and dietary compounds presents therapeutic opportunities for cancer.
  • Targeting specific molecular pathways, such as mitogen-activated protein kinase pathways, may restore normal cell function.
  • Dietary compounds show potential in restoring abnormal cell proliferation and apoptosis rates to normal levels.

Related Concept Videos

mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
Cancer Prevention02:59

Cancer Prevention

Several factors can increase the risk of cancer in an individual. About 50% of cancer cases can be prevented by adopting a healthy lifestyle, regular exercise, eating healthy, and following a modest cancer prevention diet. Epidemiological studies have consistently shown that populations with vegetable and fruit-rich diets have reduced the incidence of cancer. On the other hand, populations who have a diet rich in animal fat, red meat, junk food, or high calories are predisposed to cancer.
Some...
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 Second Messengers01:15

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...
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...
Signal Transduction: Overview01:26

Signal Transduction: Overview

Cells respond to many types of information, often through receptor proteins positioned on the membrane. They respond to chemical signals, such as hormones, neurotransmitters, and other signaling molecules, initiating a series of molecular reactions to produce an appropriate response. This is called signal transduction. Cells also coordinate different responses elicited by the same signaling molecule via mediators, allowing molecular cross-talk.
Typically, signal transduction involves three...