Abstract
Background
Localized to cell membrane, γ-glutamyl transferase (GGT) is a reliable marker for the evaluation of cell distress occurring in several pathological conditions including obesity, metabolic syndrome, and cancer. In particular, high GGT serum levels are associated with breast cancer incidence and progression.
Methods
The tissue expression of GGT1, the gene coding for GGT, was investigated in silico in a large case series of paired samples of breast cancer and adjacent histologically normal (HN) tissue, and in a collection of healthy breast tissues from reduction mammoplasty. The association of GGT1 with patient’s body mass index (BMI), and the relationship between GGT1 and a panel of genes involved in apoptosis, IGF-1 signaling, or coding for adipokines and adipokine receptors were also investigated.
Results
GGT1 expression was significantly higher in tumor than in the adjacent HN tissue (P = 0.0002). Unexpectedly, the expression of GGT1 was inversely associated with BMI in normal and HN tissue, whereas no correlation was found in cancerous tissue. In all tissues, GGT1 correlated positively with TP53 and negatively with BCL2 and LEPR, whereas only in normal and HN tissue GGT1 correlated positively with IGF1R. The linear regression model, adjusted for BMI, showed no confounding effect on any correlation, except for the correlation of GGT1 with LEPR in normal tissue from healthy women.
Conclusions
Even if present results provide interesting insights on the still elusive mechanism(s) underlying the association between obesity and epithelial cell proliferation, possibly promoting neoplastic transformation, such relationship deserves further investigation in other independent datasets.
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Data availability
Original data are available through the NCBI Gene Expression Omnibus (GEO) database (https://www.ncbi.nlm.nhi.gov/geo/).
Abbreviations
- ADIPOQ:
-
Adiponectin
- ADIPOR1:
-
Adiponectin receptor 1
- ADIPOR2:
-
Adiponectin receptor 2
- APLN:
-
Apelin
- APLNR:
-
Apelin receptor
- BCL2:
-
Bcl2, apoptosis regulator
- BMI:
-
Body mass index
- CCRL2:
-
Chemokine (C–C Motif) receptor-like 2
- CDH13:
-
Cadherin 13
- GEO:
-
Gene expression omnibus
- FAS:
-
Fas (TNF receptor superfamily, member 6)
- FASLG:
-
Fas ligand
- GGT:
-
γ-Glutamyl transferase
- GGT1:
-
γ-Glutamyl transferase 1
- GPER1:
-
G protein-coupled estrogen receptor 1
- HN:
-
Histologically normal
- IGF-1:
-
Insulin-like growth factor-1
- IGF1R:
-
Insulin-like growth factor-1 receptor
- IGFBP:
-
Insulin-like growth factor binding protein
- LEP:
-
Leptin
- LEPR:
-
Leptin receptor
- RARRES2:
-
Retinoic acid receptor responder 2
- TNF:
-
Tumor necrosis factor
- TP53:
-
Tumor protein p53
- TU:
-
Tumor
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DC conceived the study, wrote the paper and prepared the figures. SO assisted in data interpretation and manuscript preparation. FA and SG analyzed the data, and assisted in data interpretation and manuscript preparation.
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Present study was performed using publicly-available datasets retrieved from GEO database. As regards GSE70947, the original study was approved by REC SouthEast (Regional Ethical Committee for Medical and Health Research Ethics) and by the Ethical Committee for Aarhus county and by “Datatilsynet” (The Data Inspectorate, an independent administrative body under the Ministry of Government Administration and Reform), whereas as regards GSE33526, the original study was approved by the Institutional Review Boards at Baystate Medical Center and University of Massachusetts Amherst. In both cases, all patients consented to provide excess tissues not needed for research purposes.
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Coradini, D., Gambazza, S., Oriana, S. et al. Body mass index and γ-glutamyl transferase expression in normal and cancerous breast tissue. Breast Cancer 27, 850–860 (2020). https://doi.org/10.1007/s12282-020-01080-5
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DOI: https://doi.org/10.1007/s12282-020-01080-5