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Related Concept Videos

Small GTPases - Ras and Rho01:24

Small GTPases - Ras and Rho

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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.
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The Ras Gene02:38

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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.
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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.
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Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
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Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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Related Experiment Video

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RhoC GTPase Activation Assay
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The Role of the RhoA Activating Protein Net1 in Cancer Initiation and Progression.

Yan Zuo1, Stephanie A Planque1, Jeffrey A Frost1

  • 1Department of Integrative Biology and Pharmacology, University of Texas Health Science Center at Houston, Houston, Texas, USA.

Molecular and Cellular Biology
|December 26, 2025
PubMed
Summary

Neuroepithelial transforming gene 1 (Net1) drives cancer progression by activating RhoA/RhoB GTPases. Overexpression of Net1 correlates with poor survival and promotes tumor cell motility, invasion, proliferation, and metastasis.

Keywords:
Net1RhoAcancercell motilitymetastasisproliferation

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Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Rho GTPases are crucial in human cancer, but are activated by upstream Rho GDP exchange factors (RhoGEFs), not direct mutation.
  • Neuroepithelial transforming gene 1 (Net1) is a RhoA/RhoB-specific GEF overexpressed in many cancers.
  • High Net1 expression correlates with reduced disease-free and overall survival in cancer patients.

Purpose of the Study:

  • To review the evidence for Net1's role in tumor progression.
  • To describe the mechanisms regulating Net1 expression and activity in cancer.

Main Methods:

  • Literature review of studies investigating Net1 in cancer.
  • Analysis of signaling pathways regulated by Net1.
  • Examination of Net1's role in tumor cell phenotypes and tumor biology.

Main Results:

  • Net1 promotes cancer cell phenotypes, including motility, invasion, and proliferation.
  • Net1 regulates diverse pathways controlling cytoskeletal organization, transcription, DNA damage, and mitosis.
  • Net1 is essential for tumor cell proliferation, angiogenesis, and metastasis.

Conclusions:

  • Net1 is a key driver of tumor progression and metastasis.
  • Understanding Net1 regulation is critical for developing targeted cancer therapies.