KI-HD Dotaz Zobrazit nápovědu
(1) Background: Huntington's disease (HD) is rare incurable hereditary neurodegenerative disorder caused by CAG repeat expansion in the gene coding for the protein huntingtin (HTT). Mutated huntingtin (mHTT) undergoes fragmentation and accumulation, affecting cellular functions and leading to neuronal cell death. Porcine models of HD are used in preclinical testing of currently emerging disease modifying therapies. Such therapies are aimed at reducing mHTT expression, postpone the disease onset, slow down the progression, and point out the need of biomarkers to monitor disease development and therapy efficacy. Recently, extracellular vesicles (EVs), particularly exosomes, gained attention as possible carriers of disease biomarkers. We aimed to characterize HTT and mHTT forms/fragments in blood plasma derived EVs in transgenic (TgHD) and knock-in (KI-HD) porcine models, as well as in HD patients' plasma. (2) Methods: Small EVs were isolated by ultracentrifugation and HTT forms were visualized by western blotting. (3) Results: The full length 360 kDa HTT co-isolated with EVs from both the pig model and HD patient plasma. In addition, a ~70 kDa mutant HTT fragment was specific for TgHD pigs. Elevated total huntingtin levels in EVs from plasma of HD groups compared to controls were observed in both pig models and HD patients, however only in TgHD were they significant (p = 0.02). (4) Conclusions: Our study represents a valuable initial step towards the characterization of EV content in the search for HD biomarkers.
- Klíčová slova
- Huntington´s disease, KI-HD, TgHD, biomarker, exosome, extracellular vesicle, fragment, huntingtin, neurodegenerative disease, pig model,
- MeSH
- biologické markery MeSH
- extracelulární vezikuly * metabolismus MeSH
- Huntingtonova nemoc * metabolismus MeSH
- krevní plazma metabolismus MeSH
- lidé MeSH
- prasata MeSH
- proteiny nervové tkáně genetika metabolismus MeSH
- zvířata MeSH
- Check Tag
- lidé MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- Názvy látek
- biologické markery MeSH
- proteiny nervové tkáně MeSH
Sandwich ELISA-based methods use Abs that target the expanded polyglutamine (polyQ) tract to quantify mutant huntingtin (mHTT). Using Meso Scale Discovery (MSD) assay, the mHTT signal detected with MW1 Ab correlated with polyQ length and doubled with a difference of only 7 glutamine residues between equivalent amounts of purified mHTTexon1 proteins. Similar polyQ length-dependent effects on MSD signals were confirmed using endogenous full length mHTT from brains of Huntington's disease (HD) knock-in (KI) mice. We used this avidity bias to devise a method to assess average CAG repeat instability at the protein level in a mixed population of HTT proteins present in tissues. Signal detected for average polyQ length quantification at the protein level by our method exhibited a strong correlation with average CAG repeat length at the genomic DNA level determined by PCR method in striatal tissue homogenates from HdhQ140 KI mice and in human HD postmortem cortex. This work establishes that CAG repeat instability in mutant HTT is reflected at the protein level.
- MeSH
- DNA genetika MeSH
- exony genetika MeSH
- expanze trinukleotidových repetic genetika MeSH
- lidé MeSH
- myši inbrední C57BL MeSH
- myši transgenní MeSH
- peptidy genetika MeSH
- protein huntingtin chemie genetika MeSH
- protilátky metabolismus MeSH
- sekvence aminokyselin MeSH
- zvířata MeSH
- Check Tag
- lidé MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- DNA MeSH
- peptidy MeSH
- polyglutamine MeSH Prohlížeč
- protein huntingtin MeSH
- protilátky MeSH
OBJECTIVE: This study presents the design and synthesis of a new series of human carbonic anhydrase (hCA) inhibitors based on a 5-methyl/phenyl-7-(7'-oxycoumarin)-[1,2,4]triazolo[1,5-a]pyrimidine scaffold. METHODS: The chemical structures of novel coumarin-based triazolopyrimidines 3a-u were confirmed after using NMR and MS analyses. Their inhibitory profiles were evaluated against a panel of five hCA isoforms. Molecular docking simulations were conducted to elucidate the binding modes of compounds 3d and 3s with hCA IX and XII isoforms. Selected derivatives 3d and 3g were tested for their antiproliferative effects on the medulloblastoma HD-MB03 and the glioblastoma U87MG cell lines. Additionally, compounds 3d and 3g were evaluated alone or in combination with cisplatin (cis-Pt) for their ability to induce apoptosis in HD-MB03 cells. RESULTS: In vitro kinetic studies demonstrated that all 5-methyl triazolopyrimidine derivatives (3a-r) selectively inhibited the tumor-associated hCA isoforms (hCA IX and XII), with KI values ranging from 0.75 to 10.5 μM, while hCA I, II, IV isoforms were not significantly inhibited (KIs > 100 μM). Compound 3d emerged as the most potent and selective inhibitor, with KIs of 0.92 and 0.75 μM for hCA IX and XII, respectively. This derivative significantly suppressed cell proliferation in human brain tumor cell lines, particularly HD-MB03, when it was studied for its adjuvant effects in combination with cisplatin. CONCLUSION: In this study, we have identified compound 3d as a selective inhibitor of the isoforms hCA IX and XII, showing minimal inhibition over hCA I, II, and IV isoenzymes (selectivity indices > 100). Its moderate inhibitory effects on hCA IX and XII at submicromolar levels were paralleled by significant antiproliferative activity against HD-MB03 cells. These findings underscore the potential of compound 3d as a promising candidate for further therapeutic development, especially in combination with clinically used chemotherapeutic agents.
- Klíčová slova
- 2, 4]triazolo[1, 5-a]pyrimidine, Carbonic anhydrase inhibitors, [1, antiproliferative activity, coumarin, isoform selectivity, structure– activity relationship.,
- Publikační typ
- časopisecké články MeSH
INTRODUCTION: Dysarthria, a motor speech disorder caused by muscle weakness or paralysis, severely impacts speech intelligibility and quality of life. The condition is prevalent in motor speech disorders such as Parkinson's disease (PD), atypical parkinsonism such as progressive supranuclear palsy (PSP), Huntington's disease (HD), and amyotrophic lateral sclerosis (ALS). Improving intelligibility is not only an outcome that matters to patients but can also play a critical role as an endpoint in clinical research and drug development. This study validates a digital measure for speech intelligibility, the ki: SB-M intelligibility score, across various motor speech disorders and languages following the Digital Medicine Society (DiMe) V3 framework. METHODS: The study used four datasets: healthy controls (HCs) and patients with PD, HD, PSP, and ALS from Czech, Colombian, and German populations. Participants' speech intelligibility was assessed using the ki: SB-M intelligibility score, which is derived from automatic speech recognition (ASR) systems. Verification with inter-ASR reliability and temporal consistency, analytical validation with correlations to gold standard clinical dysarthria scores in each disease, and clinical validation with group comparisons between HCs and patients were performed. RESULTS: Verification showed good to excellent inter-rater reliability between ASR systems and fair to good consistency. Analytical validation revealed significant correlations between the SB-M intelligibility score and established clinical measures for speech impairments across all patient groups and languages. Clinical validation demonstrated significant differences in intelligibility scores between pathological groups and healthy controls, indicating the measure's discriminative capability. DISCUSSION: The ki: SB-M intelligibility score is a reliable, valid, and clinically relevant tool for assessing speech intelligibility in motor speech disorders. It holds promise for improving clinical trials through automated, objective, and scalable assessments. Future studies should explore its utility in monitoring disease progression and therapeutic efficacy as well as add data from further dysarthrias to the validation.
