TY  - CHAP
AB  - Protoporphyrin IX (PPIX) is formed from δ-aminolevulinic acid (ALA) during heme biosynthesis. Due to its cyclic tetrapyrrole core structure, it absorbs in the visible region of the electromagnetic spectrum and is thus colored. Both ALA and PPIX have become of great interest to neurosurgery, because in high-grade glioma, ALA diffuses into the tumor and is converted to PPIX. Fluorescence-guided resection (FGR) takes advantage of both the enrichment of PPIX in the tumor and its fluorescent properties, which enable visualization of tumor tissue. ALA-mediated FGR thus maximizes the extent of resection with better prognosis for patients. Tumor cells are able to produce porphyrins naturally or after administration of ALA, which is also reflected in elevated plasma fluorescence of cancer patients. PPIX might thus serve as a biomarker for monitoring of the tumor burden. A liquid chromatography-mass spectrometry (LC-MS)-based method is presented to quantify PPIX in blood and serum in the context of current fluorescence-based diagnostics. The method is able to distinguish between zinc PPIX, a component of red blood cells of importance in the detection of lead poisoning and iron deficiency anemia, and metal-free PPIX. In a proof-of-principle study, it was used to follow a time course of a glioblastoma patient undergoing surgery and confirmed elevated PPIX blood levels before ALA administration. During surgery, these blood levels increased about four-fold. The here developed 10 min reversed-phase LC-target MS method now allows patient screening with high specificity and throughput.
AU  - Walke, Anna
AU  - Suero Molina, Eric Jose
AU  - Stummer, Walter
AU  - König, Simone
DO  - 10.17879/03009485565
KW  - protoporphyrin IX
KW  - zinc protoporphyrin IX
KW  - iron deficiency
KW  - lead poisoning
KW  - porphyria
KW  - biomarker
KW  - cancer
KW  - ion trap mass spectrometry
KW  - brain tumor
KW  - glioblastoma
KW  - blood
LA  - eng
N1  - Goran Mitulović (ed.): Mass Spectrometry in Life Sciences and Clinical Laboratory. IntechOpen, 2021. ISBN 978-1-83881-861-6, 154 S.
N1  - Finanziert durch den Open-Access-Publikationsfonds 2021 der Westfälischen Wilhelms-Universität Münster (WWU Münster).
PY  - 2020-12-12
SN  - 978-1-83881-863-0
TI  - Protoporphyrin IX Analysis from Blood and Serum in the Context of Neurosurgery of Glioblastoma
UR  - https://nbn-resolving.org/urn:nbn:de:hbz:6-03009484598
Y2  - 2024-11-24T18:32:01
ER  -