Zusammenfassung
Hintergrund
Amyloidosen sind charakterisiert durch die extrazelluläre Deposition abnorm gefalteter Proteine.
Ziel
Die exakte Typisierung renaler Amyloidosen ist essenziell, um Aussagen über die Prognose zu treffen, eine genetische Beratung durchzuführen und eine adäquate Therapie einzuleiten.
Material und Methoden
Zur Typisierung stehen aktuell im Wesentlichen zwei Methoden zur Verfügung – zum einen die Immunhistochemie, zum anderen die Massenspektrometrie (MS). Die Lasermikrodissektion, gefolgt von Liquid-Chromatographie und MS, stellt eine Methode dar, die in mehreren Labors bereits fest in der Routinediagnostik etabliert ist. Neben diesem Ansatz ist die MALDI („matrix-assisted laser desorption/ionization imaging“)-Methode geeignet zur Amyloidtypisierung an Paraffinmaterial.
Ergebnisse
Letztere Methode steht vor der klinischen Einführung und stellt eine sensitive und schnelle Technik dar, die nicht nur eine Klassifizierung, sondern auch eine sterische Zuordnung zu kongorotpositiven Arealen zulässt.
Diskussion
Limitierend ist bisher der hohe apparative Aufwand. In Zukunft könnte jedoch eine derartige Ausstattung zum Standard großer Institute für Pathologie gehören.
Abstract
Background
Amyloidosis is characterized by extracellular accumulation of misfolded proteins.
Aim
The exact subtyping of renal amyloidosis is essential for prognostic stratification, genetic counseling and therapeutic management.
Material and methods
Amyloidosis typing may be mainly achieved through two methods: immunohistochemistry and mass spectrometry (MS). Laser microdissection coupled to liquid chromatography/MS represents one possible method that is well established in the routine diagnostics in many laboratories. Additionally, matrix-assisted laser desorption/ionization imaging (MALDI) is available for diagnosis of amyloidosis in formalin-fixed paraffin embedded material.
Results
The latter method (MALDI) will be introduced into the clinical practice and is a sensitive and rapid technique not only for subtyping but also for a steric correlation with Congo red stained areas.
Discussion
Currently the general application in routine diagnostics is not yet feasible in most areas, as sophisticated technical equipment is needed. Nevertheless, in the future these applications may be the standard for subtyping of amyloidosis.
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Acknowledgements
Die vorgestellten eigenen Arbeiten zur Massenspektrometrie werden durch die Bruker Daltonik GmbH unterstützt.
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J. Kriegsmann erhält technische Unterstützung durch die Bruker Daltonik GmbH. R. Casadonte, M. Kriegsmann, K. Amann und D. Suckau geben an, dass kein Interessenkonflikt besteht.
Dieser Beitrag beinhaltet keine Studien an Menschen oder Tieren.
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Casadonte, R., Kriegsmann, M., Amann, K. et al. Altes und Neues zum Amyloidosenachweis in Nierenbiopsien. Nephrologe 10, 295–302 (2015). https://doi.org/10.1007/s11560-014-0956-z
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DOI: https://doi.org/10.1007/s11560-014-0956-z