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Exploring the Role of NAD+ Homeostasis in Cardiac Hypertrophy and Functional Abnormalities in a Mouse Model of Friedreich's Ataxia
Exploring the Role of NAD+ Homeostasis in Cardiac Hypertrophy and Functional Abnormalities...
Exploring the Role of NAD+ Homeostasis in Cardiac Hypertrophy and Functional Abnormalities in a Mouse Model of Friedreich's Ataxia

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211151015
ISBN  
9798382835372
DDC  
574
저자명  
Perry, Caroline Elisabeth.
서명/저자  
Exploring the Role of NAD+ Homeostasis in Cardiac Hypertrophy and Functional Abnormalities in a Mouse Model of Friedreichs Ataxia
발행사항  
[Sl] : University of Pennsylvania, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
146 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
주기사항  
Advisor: Baur, Joseph A.
학위논문주기  
Thesis (Ph.D.)--University of Pennsylvania, 2024.
초록/해제  
요약Nearly half of all adults in the United States are currently living with some form of cardiovascular disease. In many cases this progresses to heart failure, for which there is no cure. In human heart failure, a decline in nicotinamide adenine dinucleotide (NAD+) has been observed in heart tissue. In multiple rodent models of heart failure, administration of NAD+ precursors has been shown to improve cardiac function. FRDA is a progressive disorder caused by insufficient expression of frataxin, which plays a critical role in assembly of iron-sulfur clusters in mitochondria. Many individuals with FRDA ultimately develop heart failure. We hypothesized that loss of NAD+ within mitochondria might contribute to cardiomyopathy in these individuals. To test this hypothesis, as well as the broader role of NAD+ in a relevant model of FRDA, we studied mice with systemic knockdown of frataxin (shFxn), which display motor deficits and early mortality with cardiac hypertrophy. We found that hearts in these mice did not "fail" per se but become hyperdynamic with small chamber size. Hearts from shFxn mice had lower tissue NAD+, consistent with other models of heart failure, but maintained the mitochondrial NAD+ level despite mitochondrial dysfunction. Administering nicotinamide mononucleotide or riboside increased survival and modestly improved cardiac hypertrophy. Mechanistically, most of the transcriptional and metabolic changes induced by frataxin knockdown were insensitive to treatment, but total glutathione levels increased suggesting improved antioxidant capacity. To test whether mitochondrial NAD+ decline could result in hypertrophy or heart failure, we studied mice with reduced expression of the mitochondrial NAD+ carrier SLC25A51. We found that aging mouse hearts are resilient to mitochondrial NAD+ decline. Altogether, we demonstrate that a partial decline in mitochondrial NAD+ does not contribute to the pathology in this model of FRDA, and is not sufficient to cause heart failure. Our findings indicate that in the context of FRDA, which exhibits NAD+ depletion and cardiac hypertrophy, NAD+ precursors are modestly cardioprotective and prolong survival, likely independently from mitochondrial NAD+. 
일반주제명  
Biology
일반주제명  
Medicine
일반주제명  
Molecular biology
일반주제명  
Biomechanics
키워드  
Cardiovascular disease
키워드  
Cardiac hypertrophy
키워드  
Mitochondrial dysfunction
키워드  
Nicotinamide adenine dinucleotide
키워드  
Heart failure
기타저자  
University of Pennsylvania Cell and Molecular Biology
기본자료저록  
Dissertations Abstracts International. 85-12B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■1001  ▼aPerry,  Caroline  Elisabeth.
■24510▼aExploring  the  Role  of  NAD+  Homeostasis  in  Cardiac  Hypertrophy  and  Functional  Abnormalities  in  a  Mouse  Model  of  Friedreich's  Ataxia
■260    ▼a[Sl]▼bUniversity  of  Pennsylvania▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a146  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Baur,  Joseph  A.
■5021  ▼aThesis  (Ph.D.)--University  of  Pennsylvania,  2024.
■520    ▼aNearly  half  of  all  adults  in  the  United  States  are  currently  living  with  some  form  of  cardiovascular  disease.  In  many  cases  this  progresses  to  heart  failure,  for  which  there  is  no  cure.  In  human  heart  failure,  a  decline  in  nicotinamide  adenine  dinucleotide  (NAD+)  has  been  observed  in  heart  tissue.  In  multiple  rodent  models  of  heart  failure,  administration  of  NAD+  precursors  has  been  shown  to  improve  cardiac  function.  FRDA  is  a  progressive  disorder  caused  by  insufficient  expression  of  frataxin,  which  plays  a  critical  role  in  assembly  of  iron-sulfur  clusters  in  mitochondria.  Many  individuals  with  FRDA  ultimately  develop  heart  failure.  We  hypothesized  that  loss  of  NAD+  within  mitochondria  might  contribute  to  cardiomyopathy  in  these  individuals.  To  test  this  hypothesis,  as  well  as  the  broader  role  of  NAD+  in  a  relevant  model  of  FRDA,  we  studied  mice  with  systemic  knockdown  of  frataxin  (shFxn),  which  display  motor  deficits  and  early  mortality  with  cardiac  hypertrophy.  We  found  that  hearts  in  these  mice  did  not  "fail"  per  se  but  become  hyperdynamic  with  small  chamber  size.  Hearts  from  shFxn  mice  had  lower  tissue  NAD+,  consistent  with  other  models  of  heart  failure,  but  maintained  the  mitochondrial  NAD+  level  despite  mitochondrial  dysfunction.  Administering  nicotinamide  mononucleotide  or  riboside  increased  survival  and  modestly  improved  cardiac  hypertrophy.  Mechanistically,  most  of  the  transcriptional  and  metabolic  changes  induced  by  frataxin  knockdown  were  insensitive  to  treatment,  but  total  glutathione  levels  increased  suggesting  improved  antioxidant  capacity.  To  test  whether  mitochondrial  NAD+  decline  could  result  in  hypertrophy  or  heart  failure,  we  studied  mice  with  reduced  expression  of  the  mitochondrial  NAD+  carrier  SLC25A51.  We  found  that  aging  mouse  hearts  are  resilient  to  mitochondrial  NAD+  decline.  Altogether,  we  demonstrate  that  a  partial  decline  in  mitochondrial  NAD+  does  not  contribute  to  the  pathology  in  this  model  of  FRDA,  and  is  not  sufficient  to  cause  heart  failure.  Our  findings  indicate  that  in  the  context  of  FRDA,  which  exhibits  NAD+  depletion  and  cardiac  hypertrophy,  NAD+  precursors  are  modestly  cardioprotective  and  prolong  survival,  likely  independently  from  mitochondrial  NAD+. 
■590    ▼aSchool  code:  0175.
■650  4▼aBiology
■650  4▼aMedicine
■650  4▼aMolecular  biology
■650  4▼aBiomechanics
■653    ▼aCardiovascular  disease
■653    ▼aCardiac  hypertrophy
■653    ▼aMitochondrial  dysfunction
■653    ▼aNicotinamide  adenine  dinucleotide  
■653    ▼aHeart  failure
■690    ▼a0306
■690    ▼a0564
■690    ▼a0648
■690    ▼a0307
■71020▼aUniversity  of  Pennsylvania▼bCell  and  Molecular  Biology.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0175
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160411▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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