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Evaluation of novel fluorescent probes for in vivo Transthyretin amyloid using fibrils generated in vitro under varying conditions
Linköpings universitet, Institutionen för fysik, kemi och biologi. (Hammarström Lab)
2019 (Engelska)Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
Abstract [en]

Transthyretin (TTR) amyloidosis is a disease that appears in three variants. One variant affects the elderly population with heart failure, the other two variants are hereditary and caused by an amino acid substitution in the gene, resulting in polyneuropathy and/or heart issues depending on the amino acid substitution. However, in all three variants, other organs may also be affected with amyloid deposition in the disease course. Amyloid fibrils of TTR (ATTR) contains a mixture of full-length protein and fragments (50-127).

Luminescent conjugated oligothiophenes (LCO’s) are novel amyloid binding probes used to stain amyloid fibrils and these amyloid probes have the feature of characterizing the amyloid structure in terms of fluorescence spectra. Apart from LCO’s, a few other amyloid binding probes are used to stain recombinant amyloid transthyretin and native transthyretin for binding studies. The majority of generated TTR aggregates in vitro did not have the characteristic fluorescence spectra when bound to LCO’s and was observed as a clumped gel-like aggregate. The generation of recombinant TTR fibrils in vitro using the mutant TTR-T49M to obtain an aggregation prone fragment (50-127) after being treated with cyanogen bromide had a low yield of in vivo amyloid-like fibrils, but with characteristic LCO spectra. Carpal tunnel ATTR often precedes ATTR deposition in heart tissue. Amyloid transthyretin in carpal tunnel tissues was stained with LCO’s and used as a reference in the comparison against the in vitro generated recombinant amyloid transthyretin fibrils. This project also includes quantification of amyloid transthyretin in a few selected parts of the carpal tunnel tissue using ImageJ. In the long run this method could help in diagnosing TTR amyloidosis.

Ort, förlag, år, upplaga, sidor
2019. , s. 50
Nyckelord [en]
Transthyretin amyloidosis, Luminescent conjugated oligothiophene, Recombinant transthyretin fibrils, TTR-T49M, Cyanogen bromide, Fluorescence spectra
Nationell ämneskategori
Naturvetenskap
Identifikatorer
URN: urn:nbn:se:liu:diva-154611ISRN: LITH-IFM-A-EX--19/3598--SEOAI: oai:DiVA.org:liu-154611DiVA, id: diva2:1290828
Ämne / kurs
Kemisk biologi
Presentation
2019-02-01, Bikupan, Linköpings universitet, Linköping, 11:15 (Engelska)
Handledare
Examinatorer
Tillgänglig från: 2019-02-21 Skapad: 2019-02-21 Senast uppdaterad: 2019-02-21Bibliografiskt granskad

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Duong, Sun
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