Abstract
Aim
Microvascular free tissue transfer is a standard method in head and neck reconstructive surgery. However, previous radiotherapy of the operative region is associated with an increased incidence in postoperative flap-related complications and complete flap loss. As transforming growth factor beta (TGF-β) 1 and galectin-3 are well known markers in the context of fibrosis and lectin-like oxidized low-density lipoprotein 1 (LOX-1) supports vascular atherosclerosis, the aim of this study was to evaluate the expression of TGF-β1 and related markers as well as LOX-1 in irradiated vessels.
Materials and methods
To evaluate the expression of galectin-3, Smad 2/3, TGF-β1, and LOX-1, 20 irradiated and 20 nonirradiated arterial vessels were used for immunohistochemical staining. We semiquantitatively assessed the ratio of stained cells/total number of cells (labeling index).
Results
Expression of galectin-3, Smad 2/3, and TGF-β1 was significantly increased in previously irradiated vessels compared with nonirradiated controls. Furthermore, LOX-1 was expressed significantly higher in irradiated compared with nonirradiated vessels.
Conclusion
Fibrosis-related proteins like galectin-3, Smad 2/3, and TGF-β1 are upregulated after radiotherapy and support histopathological changes leading to vasculopathy of the irradiated vessels. Furthermore, postoperative complications in irradiated patients can be explained by increased endothelial dysfunction caused by LOX-1 in previously irradiated patients. Consequently, not only TGF-β1 but also galectin-3inhibitors may decrease complications after microsurgical tissue transfer.
Zusammenfassung
Einführung
Der freie mikrovaskuläre Gewebetransfer gilt heute als fester Standard in der rekonstruktiven Kopf-Hals-Chirurgie. Es zeigte sich jedoch, dass im Falle einer stattgehabten Bestrahlung im Operationsgebiet mit einer erhöhten Rate an transplantatbezogenen Komplikationen gerechnet werden muss. Sowohl TGF-β1 als auch Galektin-3 sind bekannte Mediatoren in Bezug auf die Fibroseentstehung, wohingegen LOX-1 eine unterstützende Rolle bei der Entwicklung von Atherosklerose einnimmt. Das Ziel dieser Studie war es, zu untersuchen, wie sich die Expression von TGF-β1 und verwandten Fibrosemediatoren sowie LOX-1 im bestrahlten Gefäß verhält.
Material und Methoden
20 bestrahlte und 20 nichtbestrahlte Arterien wurden mittels immunhistochemischer Färbungen auf die Expression von Galektin-3, Smad2/3, TGF-β1 sowie LOX-1 hin untersucht. Semiquantitativ wurde das Verhältnis gefärbte Zellen pro Gesamtzellzahl (Färbungsindex) bestimmt.
Ergebnisse
Die Expression von Galektin-3, Smad2/3 sowie TGF-β1 war in bestrahlten Arterien signifikant höher als in nichtbestrahlten Gefäßen. LOX-1 wurde in vorbestrahlten Gefäßen ebenso signifikant höher exprimiert.
Konklusion
Mediatoren der Fibroseentstehung wie Galektin-3, Smad2/3 und TGF-β1 sind in bestrahlten Gefäßen erhöht exprimiert und tragen mutmaßlich zu der Entstehung der radiogen induzierten Vaskulopathie bei. Des Weiteren können postoperative Komplikationen bei bestrahlen Patienten durch die verstärkte endotheliale Dysfunktion, unterstützt durch LOX-1, erklärt werden. Folglich könnten nicht nur TGF-β1- sondern auch Galektin-3-Inhibitoren einen minimierenden Effekt auf die Komplikationen nach mikrovaskulärem Gewebetransfer haben.
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Acknowledgments
Author contribution
R.H.M.P., P.M., A.S. and F.W. designed the study, R.H.M.P., P.M. and M.W. collected the data, R.H.M.P., F.W., K.A., A.S. and F.N. drafted the article and all authors approved the final version.
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R.H.M. Preidl, P. Möbius, M. Weber, K. Amann, F.W. Neukam, A. Schlegel, and F. Wehrhan state that there are no conflicts of interest. All studies on humans described in the present manuscript were carried out with the approval of the responsible ethics committee and in accordance with national law and the Helsinki Declaration of 1975 (in its current, revised form). Informed consent was obtained from all patients included in studies.
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Raimund H.M. Preidl and Patrick Möbius shared first authorship.
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Preidl, R., Möbius, P., Weber, M. et al. Expression of transforming growth factor beta 1-related signaling proteins in irradiated vessels. Strahlenther Onkol 191, 518–524 (2015). https://doi.org/10.1007/s00066-014-0797-8
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DOI: https://doi.org/10.1007/s00066-014-0797-8
Keywords
- Radiotherapy
- Vessel
- Radiation-induced vasculopathy
- Transforming growth factor beta
- Head and neck surgery