Ras Map Kinase
Ras Map Kinase - Related Videos
02:38
The Ras Gene
0 Views •
2021
The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis. Ras is a superfamily...
02:38
The Ras Gene
0 Views •
2023
The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis. Ras is a superfamily...
01:24
Small GTPases - Ras and Rho
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2023
Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides. Three regulatory proteins control their activity: Guanine nucleotide exchange factors or GEF, GTPase-activating proteins or GAPs, and Guanine nucleotide-dissociation inhibitors or GDIs. The GEF activates the GTPase by exchanging the bound-GDP with GTP. The GTPases’...
01:07
MAPK Signaling Cascades
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2023
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...
08:12
Identification of EGFR and RAS Inhibitors using Caenorhabditis elegans
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Cited by 4 •
2020
The genetically tractable nematode Caenorhabditis elegans can be used as a simple and inexpensive model for drug discovery. Described here is a protocol to identify anticancer therapeutics that inhibit the downstream signaling of RAS and EGFR proteins.
FAQs
Ras activation links signals received at the cell surface to downstream kinase activity, but its importance depends on whether signaling remains appropriately regulated. When receptors stimulate Ras, Ras recruits RAF, positioning the pathway to relay the signal through MEK and ERK. This provides a mechanistic connection between extracellular conditions and changes in proliferation, differentiation, survival, and gene expression.
The RAF-MEK-ERK sequence organizes signaling as a phosphorylation cascade rather than as isolated component activity. RAF acts upstream of MEK, and MEK acts upstream of ERK, allowing the signal to progress through defined kinase steps. Once activated, ERK can regulate targets in both the cytoplasm and nucleus, linking pathway activity to distinct cellular responses.
Mutations or abnormal activation in pathway components can convert regulated signaling into a driver of uncontrolled cell growth and tumor development. This makes the pathway useful for examining oncogenic mechanisms, because researchers can relate altered Ras, RAF, MEK, or ERK activity to cancer-associated cellular behavior. The same abnormalities may also guide biomarker and inhibitor studies.
By measuring pathway activity, investigators can determine whether signaling is altered in a cancer research setting. These measurements can support identification of biomarkers, evaluation of targeted inhibitors, and assessment of treatment response. Comparing activity with therapeutic outcomes can also reveal patterns associated with resistance, connecting pathway behavior to broader questions in cancer biology.
Ras MAP kinase analysis supports targeted inhibitor development by identifying a signaling network whose components can be examined in relation to oncogenic activity. Investigators can focus on pathway behavior involving Ras, RAF, MEK, and ERK, then use activity measurements to evaluate whether an intervention affects the signaling state associated with cancer-related growth. This connects molecular mechanism with therapeutic testing.
Activity measurements provide a molecular readout for examining what happens after treatment. They can be used to assess treatment response and to investigate mechanisms of therapeutic resistance, especially when pathway behavior does not align with the expected effect of an intervention. In cancer research, this connects treatment outcomes with signaling changes.