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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 induce la motilidad de ampollas en celulas
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104821
- ISBN
- 9798293802494
- DDC
- 616.079
- 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 Gi 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
- 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
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202104821
■006m o d
■007cr#unu||||||||
■020 ▼a9798293802494
■035 ▼a(MiAaPQ)AAI32169206
■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 Gi 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.


