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The Glycosyltransferase Alpha-1,3-Mannosyltransferase (ALG3) Is an AKT Substrate that Regulates Protein N-Glycosylation in Breast Cancer Cells.
The Glycosyltransferase Alpha-1,3-Mannosyltransferase (ALG3) Is an AKT Substrate that Regulates Protein N-Glycosylation in Breast Cancer Cells.

상세정보

자료유형  
 학위논문
Control Number  
0017161660
International Standard Book Number  
9798382776224
Dewey Decimal Classification Number  
574
Main Entry-Personal Name  
Navarro, Adrija June.
Publication, Distribution, etc. (Imprint  
[S.l.] : Harvard University., 2024
Publication, Distribution, etc. (Imprint  
Ann Arbor : ProQuest Dissertations & Theses, 2024
Physical Description  
198 p.
General Note  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
General Note  
Advisor: Toker, Alex.
Dissertation Note  
Thesis (Ph.D.)--Harvard University, 2024.
Summary, Etc.  
요약The PI3K/AKT signaling pathway is frequently dysregulated in cancer and controls critical cellular processes such as survival, proliferation, metabolism and growth. Additionally, protein glycosylation is essential for proper protein folding and is also frequently deregulated in cancer. Cancer cells require increased protein folding capacity to sustain high proliferation rates. The glycosyltransferase alpha-1,3- mannosyltransferase (ALG3) catalyzes the addition of mannose units to an N-glycan precursor during glycan biosynthesis. ALG3 is a rate-limiting enzyme during glycan biosynthesis in the endoplasmic reticulum.Using in vitro approaches and cell-based assays, we discovered that in breast cancer cells ALG3 functions downstream of the PI3K pathway, and is directly phosphorylated by AKT at Ser11/Ser13. This represents a direct link between PI3K/AKT oncogenic signaling and protein glycosylation. Additionally, we found that the ALG3 gene resides proximal to the PIK3CA gene in the 3q26 amplicon. Consequently, PIK3CA and ALG3 are co-amplified in both lung, breast and ovarian carcinomas. Using cell-based assays, we found that depletion of ALG3 leads to improper glycan formation, induces ER stress and reduces proliferation of breast cancer cells. We further used lectin staining approaches to reveal the functional consequence of PI3K/AKT-mediated regulation of ALG3 function, including the proper folding and surface expression of receptor tyrosine kinases.The studies outlined in this thesis support a model in which in normal cell physiology, growth factor stimulation of the PI3K/AKT pathway leads to phosphorylation of ALG3 at Ser11/Ser13 to facilitate the rate of protein N-glycosylation. Similarly, we further propose a model in which the demands of a rapidly proliferating cancer cell are in part mediated by increased proper protein folding facilitated by ALG3 regulation by hyperactive PI3K/AKT. Consequently, depletion of ALG3 leads to improper glycan formation, proteins misfolding and induction of ER stress and the unfolded protein response. Collectively, these findings advance our understanding of the regulation of N-glycosylation by oncogene-driven signaling and its role in cancer progression, and in turn pave the way for exploring future combination strategies targeting PI3K/AKT and protein glycosylation.
Subject Added Entry-Topical Term  
Cellular biology.
Subject Added Entry-Topical Term  
Biology.
Subject Added Entry-Topical Term  
Biochemistry.
Subject Added Entry-Topical Term  
Oncology.
Index Term-Uncontrolled  
Alpha-1,3- mannosyltransferase
Index Term-Uncontrolled  
Cancer
Index Term-Uncontrolled  
Glycosylation
Index Term-Uncontrolled  
Phosphorylation
Index Term-Uncontrolled  
Oncogenic signaling
Added Entry-Corporate Name  
Harvard University Medical Sciences
Host Item Entry  
Dissertations Abstracts International. 85-12B.
Electronic Location and Access  
로그인을 한후 보실 수 있는 자료입니다.
Control Number  
joongbu:654989

MARC

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■1001  ▼aNavarro,  Adrija  June.▼0(orcid)0000-0003-0228-4978
■24510▼aThe  Glycosyltransferase  Alpha-1,3-Mannosyltransferase  (ALG3)  Is  an  AKT  Substrate  that  Regulates  Protein  N-Glycosylation  in  Breast  Cancer  Cells.
■260    ▼a[S.l.]▼bHarvard  University.  ▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a198  p.
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Toker,  Alex.
■5021  ▼aThesis  (Ph.D.)--Harvard  University,  2024.
■520    ▼aThe  PI3K/AKT  signaling  pathway  is  frequently  dysregulated  in  cancer  and  controls  critical  cellular  processes  such  as  survival,  proliferation,  metabolism  and  growth.  Additionally,  protein  glycosylation  is  essential  for  proper  protein  folding  and  is  also  frequently  deregulated  in  cancer.  Cancer  cells  require  increased  protein  folding  capacity  to  sustain  high  proliferation  rates.  The  glycosyltransferase  alpha-1,3-  mannosyltransferase  (ALG3)  catalyzes  the  addition  of  mannose  units  to  an  N-glycan  precursor  during  glycan  biosynthesis.  ALG3  is  a  rate-limiting  enzyme  during  glycan  biosynthesis  in  the  endoplasmic  reticulum.Using  in  vitro  approaches  and  cell-based  assays,  we  discovered  that  in  breast  cancer  cells  ALG3  functions  downstream  of  the  PI3K  pathway,  and  is  directly  phosphorylated  by  AKT  at  Ser11/Ser13.  This  represents  a  direct  link  between  PI3K/AKT  oncogenic  signaling  and  protein  glycosylation.  Additionally,  we  found  that  the  ALG3  gene  resides  proximal  to  the  PIK3CA  gene  in  the  3q26  amplicon.  Consequently,  PIK3CA  and  ALG3  are  co-amplified  in  both  lung,  breast  and  ovarian  carcinomas.  Using  cell-based  assays,  we  found  that  depletion  of  ALG3  leads  to  improper  glycan  formation,  induces  ER  stress  and  reduces  proliferation  of  breast  cancer  cells.  We  further  used  lectin  staining  approaches  to  reveal  the  functional  consequence  of  PI3K/AKT-mediated  regulation  of  ALG3  function,  including  the  proper  folding  and  surface  expression  of  receptor  tyrosine  kinases.The  studies  outlined  in  this  thesis  support  a  model  in  which  in  normal  cell  physiology,  growth  factor  stimulation  of  the  PI3K/AKT  pathway  leads  to  phosphorylation  of  ALG3  at  Ser11/Ser13  to  facilitate  the  rate  of  protein  N-glycosylation.  Similarly,  we  further  propose  a  model  in  which  the  demands  of  a  rapidly  proliferating  cancer  cell  are  in  part  mediated  by  increased  proper  protein  folding  facilitated  by  ALG3  regulation  by  hyperactive  PI3K/AKT.  Consequently,  depletion  of  ALG3  leads  to  improper  glycan  formation,  proteins  misfolding  and  induction  of  ER  stress  and  the  unfolded  protein  response.  Collectively, these  findings  advance  our  understanding  of  the  regulation  of  N-glycosylation  by  oncogene-driven  signaling  and  its  role  in  cancer  progression,  and  in  turn  pave  the  way  for  exploring  future  combination  strategies  targeting  PI3K/AKT  and  protein  glycosylation.
■590    ▼aSchool  code:  0084.
■650  4▼aCellular  biology.
■650  4▼aBiology.
■650  4▼aBiochemistry.
■650  4▼aOncology.
■653    ▼aAlpha-1,3-  mannosyltransferase
■653    ▼aCancer
■653    ▼aGlycosylation
■653    ▼aPhosphorylation
■653    ▼aOncogenic  signaling
■690    ▼a0379
■690    ▼a0306
■690    ▼a0487
■690    ▼a0992
■71020▼aHarvard  University▼bMedical  Sciences.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0084
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161660▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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