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- Title
Dopamine concentration in blood platelets is elevated in patients with head and neck paragangliomas.
- Authors
Osinga, Thamara E.; van der Horst-Schrivers, Anouk N. A.; van Faassen, Martijn; Kerstens, Michiel N.; Dullaart, Robin P. F.; Peters, Marloes A. M.; van der Laan, Bernard F. A. M.; de Bock, Geertruida H.; Links, Thera P.; Kema, Ido P.
- Abstract
Background: Plasma 3-methoxytyramine (3-MT), a metabolite of dopamine, is elevated in up to 28% of patients with head and neck paragangliomas (HNPGLs). As free dopamine is incorporated in circulating platelets, we determined dopamine concentration in platelets in patients with a HNPGL. Methods: A single center cohort study was performed between 2012 and 2014. Thirty-six patients with a HNPGL were compared to healthy controls (68 for dopamine in platelets and 120 for plasma 3-MT). Results: Dopamine concentration in platelets was elevated in HNPGL patients compared to healthy controls (median [interquartile ranges] 0.48 [0.32-0.82] pmol/109 platelets vs. 0.31 [0.24-0.47] pmol/109 platelets; p < 0.05), whereas plasma 3-MT concentration did not differ between both groups (0.06 [0.06-0.08] nmol/L vs. 0.06 [0.06-0.06] nmol/L; p = 0.119). Based on 68 healthy controls, the reference interval for dopamine concentration in platelets was 0.12-0.97 pmol/109 platelets. Six (16.7%) patients with a HNPGL demonstrated an increased dopamine concentration in platelets compared to three (8.3%) patients with an increased plasma 3-MT level (p = 0.053). The sensitivity and specificity were 16.7% and 98.5% for platelet dopamine and 8.3% and 97.5% for plasma 3-MT concentration (p = 0.37). Conclusions: Dopamine concentration in platelets is elevated in patients with a HNPGL compared to healthy subjects, and may be a novel biomarker for dopamine producing paraganglioma.
- Subjects
DOPAMINE; TYRAMINE; PARAGANGLIOMA; HEAD diseases; NECK diseases; BLOOD platelets
- Publication
Clinical Chemistry & Laboratory Medicine, 2016, Vol 54, Issue 8, p1395
- ISSN
1434-6621
- Publication type
Article
- DOI
10.1515/cclm-2015-0631