Genotype-specific differences in the tumor metabolite profile of pheochromocytoma and paraganglioma using untargeted and targeted metabolomics
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Contributors
Abstract
Context and Objective: Pheochromocytomas and paragangliomas (PGLs) are neuroendocrine tumors of sympathetic or parasympathetic paraganglia. Nearly 40% of PGLs are caused by germline mutations. The present study investigated the effect of genetic alterations on metabolic networks in PGLs. Design: Homogenates of 32 sporadic PGLs and 48 PGLs from patients with mutations in SDHB, SDHD, SDHAF-2, VHL, RET, and NF-1 were subjected to proton (1H) nuclear magnetic resonance (NMR) spectroscopy at 500 MHz for untargeted and HPLC tandem mass spectrometry for targeted metabolite profiling. Results: 1H NMR spectroscopy identified 28 metabolites in PGLs of which 12 showed genotypespecific differences. Part of these results published earlier reported low complex II activity (P < .0001) and low ATP/ADP/AMP content (P< .001) in SDH-related PGLs compared with sporadics and PGLs of other genotypes. Extending these results, low levels of N-acetylaspartic acid (NAA; P < .05) in SDH tumors and creatine (P< .05) in VHL tumors were observed compared with sporadics and other genotypes. Positive correlation was observed between NAA and ATP/ADP/AMP content (P < .001) and NAA and complex II activity (P< .0001) of PGLs. Targeted purine analysis in PGLs showed low adenine in cluster 1 compared with cluster 2 tumors (SDHP< .0001; VHL P< .05) whereas lower levels (P< .05) of guanosine and hypoxanthine were observed in RET tumors compared with SDH tumors. Principal component analysis (PCA) of metabolites could distinguish PGLs of different genotypes. Conclusions: The present study gives a comprehensive picture of alterations in energy metabolism in SDH- and VHL-related PGLs and establishes the interrelationship of energy metabolism and amino acid and purine metabolism in PGLs.
Details
Original language | English |
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Pages (from-to) | E214-E222 |
Journal | Journal of Clinical Endocrinology and Metabolism |
Volume | 100 |
Issue number | 2 |
Publication status | Published - 1 Feb 2015 |
Peer-reviewed | Yes |
External IDs
PubMed | 25459911 |
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ORCID | /0000-0002-3549-2477/work/162348093 |