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Ras family genes: an interesting link between cell cycle and cancer
1Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, USA. macaluso@temple.edu
Abstract:
Ras genes are evolutionary conserved and codify for a monomeric G protein binding GTP (active form) or GDP (inactive form). The ras genes are ubiquitously expressed although mRNA analysis suggests different level expression in tissue. Mutations in each ras gene frequently were found in different tumors, suggesting their involvement in the development of specific neoplasia. These mutations lead to a constitutive active and potentially oncogenic protein that could cause a deregulation of cell cycle. Ras protein moderates cellular responses at several mitogens and/or differentiation factors and at external stimuli. These stimuli activate a series of signal transduction pathways that either can be independent or interconnected at different points. Recent observations begin to clarify the complex relationship between Ras activation, apoptosis, and cellular proliferation. A greater understanding of these processes would help to identify the factors directly responsible for cell cycle deregulation in several tumors, moreover it would help the design of specific therapeutic strategies, for the control on the proliferation of neoplastic cells. We summarize here current knowledge of ras genes family: structural and functional characteristics of Ras proteins and their links with cell cycle and cancer.
Insights
Ras genes encode proteins crucial for cell signaling. Mutations in these genes can lead to cancer by causing uncontrolled cell growth, highlighting their role in neoplasia.
Area of Science:
- Molecular Biology
- Oncology
- Cellular Biology
Background:
- Ras genes encode monomeric G proteins that regulate cellular responses to external stimuli.
- These proteins cycle between an inactive GDP-bound and an active GTP-bound state.
- Ras proteins are involved in diverse cellular processes, including proliferation and differentiation.
Purpose of the Study:
- To review the structural and functional characteristics of the Ras gene family.
- To elucidate the link between Ras protein activity, cell cycle regulation, and cancer development.
- To highlight the potential for therapeutic strategies targeting Ras pathways in neoplastic diseases.
Main Methods:
- Literature review and synthesis of current research on Ras genes and proteins.
- Analysis of the role of Ras mutations in various tumor types.
- Examination of signal transduction pathways modulated by Ras activation.
Main Results:
- Ras mutations are frequently observed in human tumors, leading to constitutively active oncoproteins.
- Aberrant Ras signaling contributes to cell cycle deregulation and uncontrolled proliferation.
- Ras pathways are interconnected with apoptosis and cellular proliferation, influencing cancer progression.
Conclusions:
- Understanding Ras gene family functions is critical for comprehending cancer development.
- Ras proteins represent key targets for developing novel anti-cancer therapies.
- Further research into Ras-mediated signaling pathways will aid in designing effective cancer treatments.