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S1P Induces Bleb-Based T Cell Motility via S1PR1-Dependent Activation of RhoA and WNK1 : S1P induce la motilidad de ampollas en celulas
S1P Induces Bleb-Based T Cell Motility via S1PR1-Dependent Activation of RhoA and WNK1  : ...
S1P Induces Bleb-Based T Cell Motility via S1PR1-Dependent Activation of RhoA and WNK1 : S1P induce la motilidad de ampollas en celulas

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202104821
ISBN  
9798293802494
DDC  
616.079
저자명  
Staback Rodriguez, Franklin Daniel.
서명/저자  
S1P Induces Bleb-Based T Cell Motility via S1PR1-Dependent Activation of RhoA and WNK1 : S1P induce la motilidad de ampollas en celulas
발행사항  
[Sl] : University of Pennsylvania, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
98 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
주기사항  
Advisor: Burkhardt, Janis K.
학위논문주기  
Thesis (Ph.D.)--University of Pennsylvania, 2025.
초록/해제  
요약Immune cell migration relies on intricate coordination of the cytoskeleton as cells encounter multiple chemoattractants and extracellular proteins within the body. At steady state, naive T cells use migration to surveil tissues as they search for cognate antigen. In vivo, the chemokine CCL19 and its receptor CCR7 control T cell retention in lymph nodes. If T cells do not become activated, they bind the lipid chemoattractant spingosine-1-phosphate (S1P), which drives T cell egress from lymphoid organs. CCL19 is known to activate Rac1-dependent actin polymerization at the leading edge of migrating cells, generating a mode of motility driven by lamellipodial protrusions. In contrast, we showed recently that S1P induces a transient lamellipodial response, followed by pressure-driven bleb-based motility. Prior studies on bleb-based motility reported that bleb-based motility occurs downstream of RhoA activation. However, preferential RhoA activation downstream of a G⍺i-coupled receptor had not been reported thus far. Here, we elucidate the mechanisms controlling S1P responses in naive T cells. We show that S1P signals through S1PR1, with coupling through G⍺i. In contrast to CCR7, which signals through Gi to induce sustained Rac1 activation, S1PR1 engagement yields only weak and transient Rac 1 activation; the dominant response is sustained activation of RhoA. This pathway, together with a pathway involving phospholipase C and myosin light chain kinase, results in phosphorylation of myosin regulatory light chain (MLC) and enhanced myosin contractility. Inhibition of mTORC2 blocks MLC phosphorylation, consistent with evidence that tension sensing by mTORC2 can couple Rac and Rho signaling during leukocyte migration. Surprisingly, although Rho pathway inhibitors blocked S1P-induced MLC phosphorylation and blebbing, they failed to block S1P-dependent chemotaxis. This led to the identification of a second arm of the S1P response: WNK1-dependent phosphorylation of SPAK1 and OSXR1, proteins that regulate ion channels and water influx. Partial WNK1 inhibition, together with inhibition of myosin contractility, was sufficient to block S1P-induced blebbing and chemotaxis. Total WNK1 inhibition completely inhibited motility, which shows that volume control in T cells crucially regulates motile behavior. Overall, these results indicate that S1P-driven T cell migration involves coordinate activation of actin polymerization, myosin contractility and water influx.
일반주제명  
Immunology
일반주제명  
Cellular biology
일반주제명  
Molecular biology
일반주제명  
Biology
키워드  
Bleb-based motility
키워드  
Chemotaxis
키워드  
Cytoskeleton
키워드  
Migration
키워드  
Signaling
키워드  
T cells
기타저자  
University of Pennsylvania Immunology
기본자료저록  
Dissertations Abstracts International. 87-03B.
전자적 위치 및 접속  
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MARC

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■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a616.079
■1001  ▼aStaback  Rodriguez,  Franklin  Daniel.
■24510▼aS1P  Induces  Bleb-Based  T  Cell  Motility  via  S1PR1-Dependent  Activation  of  RhoA  and  WNK1  ▼bS1P  induce  la  motilidad  de  ampollas  en  celulas
■260    ▼a[Sl]▼bUniversity  of  Pennsylvania▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a98  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-03,  Section:  B.
■500    ▼aAdvisor:  Burkhardt,  Janis  K.
■5021  ▼aThesis  (Ph.D.)--University  of  Pennsylvania,  2025.
■520    ▼aImmune  cell  migration  relies  on  intricate  coordination  of  the  cytoskeleton  as  cells  encounter  multiple  chemoattractants  and  extracellular  proteins  within  the  body.  At  steady  state,  naive  T  cells  use  migration  to  surveil  tissues  as  they  search  for  cognate  antigen.  In  vivo,  the  chemokine  CCL19  and  its  receptor  CCR7  control  T  cell  retention  in  lymph  nodes.  If  T  cells  do  not  become  activated,  they  bind  the  lipid  chemoattractant  spingosine-1-phosphate  (S1P),  which  drives  T  cell  egress  from  lymphoid  organs.  CCL19  is  known  to  activate  Rac1-dependent  actin  polymerization  at  the  leading  edge  of  migrating  cells,  generating  a  mode  of  motility  driven  by  lamellipodial  protrusions.  In  contrast,  we  showed  recently  that  S1P  induces  a  transient  lamellipodial  response,  followed  by  pressure-driven  bleb-based  motility.  Prior  studies  on  bleb-based  motility  reported  that  bleb-based  motility  occurs  downstream  of  RhoA  activation.  However,  preferential  RhoA  activation  downstream  of  a  G⍺i-coupled  receptor  had  not  been  reported  thus  far.  Here,  we  elucidate  the  mechanisms  controlling  S1P  responses  in  naive  T  cells.  We  show  that  S1P  signals  through  S1PR1,  with  coupling  through  G⍺i.  In  contrast  to  CCR7,  which  signals  through  Gi  to  induce  sustained  Rac1  activation,  S1PR1  engagement  yields  only  weak  and  transient  Rac  1  activation;  the  dominant  response  is  sustained  activation  of  RhoA.  This  pathway,  together  with  a  pathway  involving  phospholipase  C  and  myosin  light  chain  kinase,  results  in  phosphorylation  of  myosin  regulatory  light  chain  (MLC)  and  enhanced  myosin  contractility.  Inhibition  of  mTORC2  blocks  MLC  phosphorylation,  consistent  with  evidence  that  tension  sensing  by  mTORC2  can  couple  Rac  and  Rho  signaling  during  leukocyte  migration.  Surprisingly,  although  Rho  pathway  inhibitors  blocked  S1P-induced  MLC  phosphorylation  and  blebbing,  they  failed  to  block  S1P-dependent  chemotaxis.  This  led  to  the  identification  of  a  second  arm  of  the  S1P  response:  WNK1-dependent  phosphorylation  of  SPAK1  and  OSXR1,  proteins  that  regulate  ion  channels  and  water  influx.  Partial  WNK1  inhibition,  together  with  inhibition  of  myosin  contractility,  was  sufficient  to  block  S1P-induced  blebbing  and  chemotaxis.  Total  WNK1  inhibition  completely  inhibited  motility,  which  shows  that  volume  control  in  T  cells  crucially  regulates  motile  behavior.  Overall,  these  results  indicate  that  S1P-driven  T  cell  migration  involves  coordinate  activation  of  actin  polymerization,  myosin  contractility  and  water  influx.
■590    ▼aSchool  code:  0175.
■650  4▼aImmunology
■650  4▼aCellular  biology
■650  4▼aMolecular  biology
■650  4▼aBiology
■653    ▼aBleb-based  motility
■653    ▼aChemotaxis
■653    ▼aCytoskeleton
■653    ▼aMigration
■653    ▼aSignaling
■653    ▼aT  cells
■690    ▼a0982
■690    ▼a0379
■690    ▼a0307
■690    ▼a0306
■71020▼aUniversity  of  Pennsylvania▼bImmunology.
■7730  ▼tDissertations  Abstracts  International▼g87-03B.
■790    ▼a0175
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359010▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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