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Parameters that determine cell fate during mitotic arrest

有丝分裂停滞期间决定细胞命运的参数

基本信息

批准号：
10409136
负责人：
Charles Bradley Shuster
金额：
$ 14.4万
依托单位：
NEW MEXICO STATE UNIVERSITY LAS CRUCES
依托单位国家：
美国
项目类别：
财政年份：
2022
资助国家：
美国
起止时间：
2022-05-10 至 2026-03-31
项目状态：
未结题

来源：
https://reporter.nih.gov/project-details/10409136
关键词：
4D Imaging Address Adjuvant Therapy Antimitotic Agents Apoptosis Apoptotic BCL2 gene Biochemical Biosensor Cancer cell line Cell Cycle Cell Death Cell Line Cell Survival Cell division Cells Centrioles Chromosome Segregation Clinic Data Dependence Drug resistance Exhibits Failure Family Flow Cytometry Foundations Future Goals Growth Hela Cells Heterogeneity Hormones Image Individual Jordan Kinesin Kinetics Laboratories MCL1 gene Malignant Neoplasms Metabolism Microscopy Microtubules Mitosis Mitotic Mitotic spindle Molecular Molecular Motors Normal Cell Pathway interactions Peripheral Nervous System Diseases Pharmaceutical Preparations Phosphotransferases Protein Inhibition Proteins Reagent Regulation Regulatory Pathway Resolution Role Signal Pathway Signal Transduction Structure TP53 gene Time Vinblastine Vinca Alkaloids Western Blotting Work Yang base cancer cell cancer therapy cell behavior chemotherapy drug development graduate student imaging approach inhibitor insight live cell imaging mTOR Signaling Pathway member neoplastic cell population based response side effect taxane training opportunity translational study tumor undergraduate student

项目摘要

Prolonged activation of the spindle assembly checkpoint (SAC) due to mitotic spindle disruption can result in p53 activation, centriole disengagement and cell death. Indeed, one chemotherapeutic strategy frequently applied to aggressive and hormone-independent cancers is to target the mitotic spindle, a microtubule-based structure that is required for proper chromosome segregation and cell division. Drugs such as vinblastine or Paciltaxel suppress the normal microtubule assembly dynamics, leading to mitotic arrest and eventual cell death by apoptosis. However, despite their decades-long implementation in the clinic, the mechanisms by which prolonged mitotic delay results in cell death remains unclear. Further, despite the universality of the requirement of the mitotic spindle for cell division, there is still a great deal of heterogeneity in how cells respond to spindle disruption, which may reduce the efficacy of anti- mitotic chemotherapeutic strategies. Using a combination of biochemical and live cell imaging approaches, our preliminary data reveals that targeting both Kinesin Spindle Protein (KSP), a molecular motor required for spindle bipolarity, and the Phosphatidylinositide 3-kinase (PI3K)/Akt/mTOR signaling pathway dramatically accelerates the kinetics of mitotic cell death relative to mitotic arrest alone. Moreover, it elicits a more homogeneous response from the treated cells. PI3K signaling is involved in a variety of regulatory pathways that regulate cell survival, metabolism and proliferation, but the mechanism by which PI3K activity promotes cell viability during mitotic arrest is unknown. To better understand how PI3K signaling is involved in the timing of cell death and variability of cellular responses of mitotic delay, we will continue to apply high-throughput timelapse imaging, high-resolution 4D imaging and biochemical approaches to a battery of cell lines differ in their sensitivity to mitotic delay as well as dependence on PI3K signaling. The Specific Aims of this project will 1) Define the protective role of PI3K in normal and cancer cells; and 2) Determine the mechanism by which PI3K promotes cell survival during mitotic delay. If successful, these studies will lay the foundation for future translational studies to further develop adjuvant therapies that will target mitotically active tumor cells without the side effects associated with other microtubule disruptors.

有丝分裂纺锤体断裂导致纺锤体组装检查点（SAC）延长激活