Epigenetic regulation of RTK signaling
Jennifer M Spangle1,2, Thomas M Roberts3,4,5
1Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA, USA.
Abstract:
Receptor tyrosine kinase (RTK) signaling cascades coordinate intracellular signaling in response to growth factors, chemokines, and other extracellular stimuli to control fundamental biological processes such as cellular proliferation, metabolism, and survival. Hyperactivation of pathways associated with growth factor signaling (e.g., RTK and downstream effectors including Ras, PI3K/AKT, and Raf) is a frequent event in human cancers, which uncouples ligand-mediated activation with signal transduction. While the contributions of direct genomic events are well understood as causative agents of hyperactive signal transduction, other non-heritable genomic modifications promote the activation of growth factor-associated signaling cascades. In this review, we highlight epigenomic mechanisms by which hyperactivation of RTK-associated signaling cascades occurs and may contribute to cancer.
Insights
Epigenomic mechanisms, not just direct gene mutations, can hyperactivate receptor tyrosine kinase (RTK) signaling. These non-heritable changes contribute to cancer by altering cell growth and survival pathways.
Area of Science:
- Oncology
- Molecular Biology
- Epigenetics
Background:
- Receptor tyrosine kinase (RTK) signaling regulates cell proliferation, metabolism, and survival.
- Hyperactivation of RTK pathways is common in cancers, often due to genomic alterations.
- Non-heritable genomic modifications also contribute to aberrant RTK signaling.
Purpose of the Study:
- To review epigenomic mechanisms driving RTK pathway hyperactivation in cancer.
- To explore how these mechanisms contribute to cancer development and progression.
Main Methods:
- Literature review focusing on epigenomic modifications.
- Analysis of RTK signaling pathways and their dysregulation in cancer.
- Integration of knowledge on non-heritable genomic changes and cancer biology.
Main Results:
- Epigenomic alterations can lead to sustained RTK signaling independent of ligand binding.
- These epigenetic changes affect key downstream effectors like Ras, PI3K/AKT, and Raf.
- Non-heritable modifications provide an alternative route to oncogenic signaling.
Conclusions:
- Epigenomic mechanisms play a significant role in RTK pathway hyperactivation in cancer.
- Understanding these epigenetic contributions is crucial for developing novel cancer therapies.
- Targeting epigenomic alterations may offer new strategies to combat RTK-driven cancers.
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