Show simple item record

dc.contributor.authorPrag, Hiran Ambelal
dc.date.accessioned2019-02-15T11:16:07Z
dc.date.available2019-02-15T11:16:07Z
dc.date.issued2019-04-27
dc.date.submitted2018-09-21
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/289443
dc.description.abstractIschaemia-reperfusion (IR) injury is caused by the re-introduction of oxygen to organs, following periods of reduced blood flow (ischaemia). Whilst re-establishing blood flow (reperfusion) to the heart following myocardial infarction is vital for organ survival, this paradoxically leads to tissue damage. Mitochondria are at the heart of IR injury, with succinate dehydrogenase (SDH) a major player in orchestrating the damage. Succinate accumulates during ischaemia and is rapidly oxidised by SDH upon reperfusion, producing reactive oxygen species (ROS), leading to cellular death. I have investigated the development of drugs, aimed at targeting succinate metabolism to ameliorate IR injury. I firstly screened a range of compounds for their ability to inhibit SDH, having been chosen for their similar structures to succinate or the classical SDH inhibitor, malonate. Interestingly, only malonate and oxaloacetate showed potent SDH inhibition, thus were selected for further development. Malonate ester prodrugs with different properties were characterised. Hydrolysis rates of the esters differed greatly, with tuned, labile, malonate esters releasing malonate much more rapidly. Malonate esters were taken up into cells and hydrolysed to release malonate to different extents. Additionally, mitochondria-targetedmalonatemono and diesters were developed, each differing in mitochondrial and cellular uptake andmalonate release. Targeted and nontargeted malonate esters distributed into tissues in vivo, with preliminary in vivo work carried out on IR injury models, to assess for protective effects of the compounds. In addition, the physiological role of the tricarboxylic acid cycle metabolite, itaconate, was investigated. In lipopolysaccharide stimulated macrophages, itaconate has been reported to exert its effects by inhibition of SDH however, I found itaconate was a relatively poor SDH inhibitor, indicating other mechanisms of action. Current prodrugs of itaconate have many non-specific effects, not attributable to itaconate. I therefore characterised a novel itaconate prodrug and found it to be a much better surrogate, which could be subsequently used to elucidate roles for itaconate. Overall, I have shown the importance of ester selection for the prodrug delivery of dicarboxylate molecules and developed methods to improve their biological delivery.
dc.language.isoen
dc.rightsAll rights reserved
dc.rightsAll Rights Reserveden
dc.rights.urihttps://www.rioxx.net/licenses/all-rights-reserved/en
dc.subjectmitochondria
dc.subjectischaemia-reperfusion injury
dc.subjectsuccinate dehydrogenase
dc.titleDeveloping drugs to attenuate succinate accumulation and oxidation
dc.typeThesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnameDoctor of Philosophy (PhD)
dc.publisher.institutionUniversity of Cambridge
dc.publisher.departmentMRC Mitochondrial Biology Unit
dc.date.updated2019-02-06T13:47:22Z
dc.identifier.doi10.17863/CAM.36692
dc.publisher.collegeWolfson College
dc.type.qualificationtitlePhD in Biological Sciences
cam.supervisorMurphy, Michael Patrick
cam.thesis.fundingtrue
rioxxterms.freetoread.startdate2025-02-15


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record