biostudies-literatureUnknown14(5)Klingstedt TSmall hydrophobic ligands identifying intracellular protein deposits are of great interest, as protein inclusion bodies are the pathological hallmark of several degenerative diseases. Here we report that fluorescent amyloid ligands, termed luminescent conjugated oligothiophenes (LCOs), rapidly and with high sensitivity detect protein inclusion bodies in skeletal muscle tissue from patients with sporadic inclusion body myositis (s-IBM). LCOs having a conjugated backbone of at least five thiophene units emitted strong fluorescence upon binding, and showed co-localization with proteins reported to accumulate in s-IBM protein inclusion bodies. Compared with conventional amyloid ligands, LCOs identified a larger fraction of immunopositive inclusion bodies. When the conjugated thiophene backboneChembiochem : a European journal of chemical biology607-16https://www.ebi.ac.uk/biostudies/studies/S-EPMC3743175biostudies-literatureLuminescent conjugated oligothiophenes for sensitive fluorescent assignment of protein inclusion bodies.PMC3743175Klingstedt TBlechschmidt CProkop SHeppner FLDanielsson OAskanas VNilsson KPNogalska AEngel WKHaggqvist BfalseLuminescent conjugated oligothiophenes for sensitive fluorescent assignment of protein inclusion bodies.Small hydrophobic ligands identifying intracellular protein deposits are of great interest, as protein inclusion bodies are the pathological hallmark of several degenerative diseases. Here we report that fluorescent amyloid ligands, termed luminescent conjugated oligothiophenes (LCOs), rapidly and with high sensitivity detect protein inclusion bodies in skeletal muscle tissue from patients with sporadic inclusion body myositis (s-IBM). LCOs having a conjugated backbone of at least five thiophene units emitted strong fluorescence upon binding, and showed co-localization with proteins reported to accumulate in s-IBM protein inclusion bodies. Compared with conventional amyloid ligands, LCOs identified a larger fraction of immunopositive inclusion bodies. When the conjugated thiophene backbone2013-01-01T00:00:00Z2013 Mar2025-04-21T15:50:11.447Z2019-03-27T01:14:34ZS-EPMC37431752345070810.1002/cbic.201200731