Autosomal dominant tubulointerstitial kidney disease (ADTKD)-uromodulin (UMOD) is the most common nonpolycystic genetic kidney disease, but it remains unrecognized due to its clinical heterogeneity and lack of screening test. Moreover, the fact that the clinical feature is a poor predictor of disease outcome further highlights the need for the development of mechanistic biomarkers in ADTKD. However, low abundant urinary proteins secreted by thick ascending limb cells, where UMOD is synthesized, have posed a challenge for the detection of biomarkers in ADTKD-UMOD. In the CRISPR/Cas9-generated murine model and patients with ADTKD-UMOD, we found that immunoglobulin heavy chain-binding protein (BiP), an endoplasmic reticulum chaperone, was exclusively upregulated by mutant UMOD in the thick ascending limb and easily detected by Western blot analysis in the urine at an early stage of disease. However, even the most sensitive ELISA failed to detect urinary BiP in affected individuals. We therefore developed an ultrasensitive, plasmon-enhanced fluorescence-linked immunosorbent assay (p-FLISA) to quantify urinary BiP concentration by harnessing the newly invented ultrabright fluorescent nanoconstruct, termed "plasmonic Fluor." p-FLISA demonstrated that urinary BiP excretion was significantly elevated in patients with ADTKD-UMOD compared with unaffected controls, which may have potential utility in risk stratification, disease activity monitoring, disease progression prediction, and guidance of endoplasmic reticulum-targeted therapies in ADTKD.NEW & NOTEWORTHY Autosomal dominant tubulointerstitial kidney disease (ADTKD)-uromodulin (UMOD) is an underdiagnosed cause of chronic kidney disease (CKD). Lack of ultrasensitive bioanalytical tools has hindered the discovery of low abundant urinary biomarkers in ADTKD. Here, we developed an ultrasensitive plasmon-enhanced fluorescence-linked immunosorbent assay (p-FLISA). p-FLISA demonstrated that secreted immunoglobulin heavy chain-binding protein is an early urinary endoplasmic reticulum stress biomarker in ADTKD-UMOD, which will be valuable in monitoring disease progression and the treatment response in ADTKD.
- MeSH
- biologické markery moč MeSH
- imunosorpční techniky * MeSH
- intersticiální nefritida genetika moč MeSH
- lidé MeSH
- myši MeSH
- proteiny teplotního šoku moč MeSH
- stres endoplazmatického retikula fyziologie MeSH
- uromodulin genetika MeSH
- zvířata MeSH
- Check Tag
- lidé MeSH
- myši MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Research Support, N.I.H., Extramural MeSH
- Research Support, U.S. Gov't, Non-P.H.S. MeSH
ER stress has emerged as a signaling platform underlying the pathogenesis of various kidney diseases. Thus, there is an urgent need to develop ER stress biomarkers in the incipient stages of ER stress-mediated kidney disease, when a kidney biopsy is not yet clinically indicated, for early therapeutic intervention. Cysteine-rich with EGF-like domains 2 (CRELD2) is a newly identified protein that is induced and secreted under ER stress. For the first time to our knowledge, we demonstrate that CRELD2 can serve as a sensitive urinary biomarker for detecting ER stress in podocytes or renal tubular cells in murine models of podocyte ER stress-induced nephrotic syndrome and tunicamycin- or ischemia-reperfusion-induced acute kidney injury (AKI), respectively. Most importantly, urinary CRELD2 elevation occurs in patients with autosomal dominant tubulointerstitial kidney disease caused by UMOD mutations, a prototypical tubular ER stress disease. In addition, in pediatric patients undergoing cardiac surgery, detectable urine levels of CRELD2 within postoperative 6 hours strongly associate with severe AKI after surgery. In conclusion, our study has identified CRELD2 as a potentially novel urinary ER stress biomarker with potential utility in early diagnosis, risk stratification, treatment response monitoring, and directing of ER-targeted therapies in selected patient subgroups in the emerging era of precision nephrology.
- MeSH
- akutní poškození ledvin diagnóza etiologie patofyziologie moč MeSH
- biologické markery moč MeSH
- dítě MeSH
- extracelulární matrix - proteiny fyziologie moč MeSH
- intersticiální nefritida genetika patofyziologie moč MeSH
- kardiochirurgické výkony MeSH
- lidé MeSH
- molekuly buněčné adheze fyziologie moč MeSH
- mutace MeSH
- myši inbrední C57BL MeSH
- nefrotický syndrom diagnóza patofyziologie moč MeSH
- podocyty metabolismus MeSH
- pooperační komplikace moč MeSH
- stres endoplazmatického retikula fyziologie MeSH
- uromodulin genetika MeSH
- zvířata MeSH
- Check Tag
- dítě MeSH
- lidé MeSH
- mužské pohlaví MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Research Support, N.I.H., Extramural MeSH
- Klíčová slova
- eosinofilurie,
- MeSH
- akutní poškození ledvin * diagnóza moč patologie MeSH
- akutní tubulární nekróza * diagnóza moč patologie MeSH
- analýza moči metody MeSH
- biopsie MeSH
- diferenciální diagnóza MeSH
- eozinofily * MeSH
- falešně negativní reakce MeSH
- intersticiální nefritida moč patologie MeSH
- ledviny patologie MeSH
- lidé středního věku MeSH
- lidé MeSH
- moč cytologie MeSH
- prediktivní hodnota testů MeSH
- retrospektivní studie MeSH
- Check Tag
- lidé středního věku MeSH
- lidé MeSH
- Publikační typ
- komentáře MeSH
Ehrlichióza je infekční onemocnění přenášené klíšťaty, agens se nazývá Anaplasma (dříve Ehrlichia) phagocytophilum, jedná se o intracelulární bakterii s afinitou ke granulocytům a způsobující poruchy imunity. Tato kazuistika dokumentuje vývoj akutního renálního postižení u pacienta s chronickou ehrlichiózou, jehož příčinou bylo těžké parainfekční poškození ledvinného tubulointersticia při septickém stavu způsobeném oportunní infekční endokarditidou a bronchopneumonií. Pro vývoj renálního postižení bylo stěžejní zvládnout sepsi cílenou antibiotickou terapií a eradikací ehrlichiózy doxycyklinem.
Ehrlichiosis is an infectious disease transmitted by ticks. The name of infectious agent is Anaplasma (originally called Ehrlichia) phagocytophilum. It is the intracellular patogen with an affinity for granulocytes causing immune disorders. This case report documents the development of acute kidney injury in patient with chronic ehrlichiosis, that was reason of severe parainfectious injury of renal tubulointerstitium during sepsis due to infectious endocarditis and bronchopneumonia. Management of sepsis by antibiotic therapy and erradication of ehrlichiosis (doxycycline) was crucial. marker proteins.
- Klíčová slova
- Anaplasma (Ehrlichia) phagocytophilum, akutní renální postižení, parainfekční tubulointersticiální nefritida, močové indikátorové proteiny,
- MeSH
- akutní poškození ledvin etiologie krev moč MeSH
- Anaplasma phagocytophilum patogenita účinky léků MeSH
- ehrlichióza * diagnóza etiologie terapie MeSH
- intersticiální nefritida moč parazitologie patologie terapie MeSH
- lidé středního věku MeSH
- lidé MeSH
- Check Tag
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- Publikační typ
- kazuistiky MeSH