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Ceramide Activated Protein Phosphatases

神经酰胺激活蛋白磷酸酶

基本信息

批准号：
10434893
负责人：
YUSUF AWNI HANNUN
金额：
$ 35.76万
依托单位：
STATE UNIVERSITY NEW YORK STONY BROOK
依托单位国家：
美国
项目类别：
财政年份：
2018
资助国家：
美国
起止时间：
2018-07-12 至 2023-06-30
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10434893
关键词：
Actins Acute Address Adhesions Apoptosis Basic Science Biochemical Biological Cell Adhesion Cell Compartmentation Cell Cycle Regulation Cell Death Cell membrane Cell physiology Cells Ceramides Cessation of life Coupled Development Elements Enzymes Event Family Generations Goals Growth Human Hydroxylation In Vitro Lipids Mediating Membrane Metabolism Molecular Nature Pathway interactions Phosphoric Monoester Hydrolases Production Protein Dephosphorylation Protein Phosphatase 2A Regulatory Subunit PR53 Protein phosphatase Proteins Regulation Role Scheme Signal Pathway Specificity Sphingolipids Sphingomyelinase Stimulus TNF gene Time biological adaptation to stress cancer cell cell growth cell growth regulation cell motility combinatorial dimer ezrin liquid chromatography mass spectrometry migration novel programs prototype radixin protein response senescence stem targeted cancer therapy tumor progression

项目摘要

Ceramide constitutes a family of closely related molecules that function as bioeffector lipids with roles in the regulation of stress responses and growth/death of various human cancer cells. Critical missing elements in our understanding of ceramide stems from the lack of molecularly-defined targets of action and from defining compartment-specific functions of ceramides. Studies in our lab supported by this project have identified ceramide-activated Ser–Thr phosphatases (CAPPs), specifically PP1 and PP2A as direct targets activated by ceramide in vitro. Studies in cells have also shown that various ceramide-inducing stimuli (e.g. TNF, UV, lipotoxic agents) induce dephosphorylation of several substrates in a ceramide-dependent manner. However, not all stimuli induce all dephosphorylations, presumably due to their activation of distinct pathways in distinct subcellular compartments. Recent results have provided us a breakthrough in defining a specific pathway of ceramide generation at the plasma membrane (PM). Here, we will investigate the hypothesis that ceramide generated at the PM acutely activates PP1cα that leads to the dephosphorylation of ezrin and other proteins. This results in a compartment-specific role for ceramide in regulating cell adhesion and migration. We will address these aims: Aim 1. Define a novel pathway of ceramide generation at the PM leading to ezrin dephosphorylation though activation of PP1cα. Here we will investigate the specific hypothesis that PM ceramide regulates a specific form of dimeric PP1c to mediate ezrin dephosphorylation, independent of raft formation. Aim 2. Identify specific cellular programs coupled to compartmentalized ceramide/CAPPs. Here we will investigate the specific hypothesis that PM ceramide, in contrast to ceramide formed in other compartments, regulates cell adhesion and migration. Taken together, these approaches should result, for the first time, in clearly defining a specific, direct, and relevant target for ceramide action (PP1) with a specific function in mediating the effects of PM ceramide on cell adhesion and migration.

神经酰胺构成了一个密切相关的分子家族