Abstract
Purpose
Obesity and oversupply of glucose, e.g., due to nutritional factors may shape the tumor microenvironment favorable for tumor progression. O-GlcNAcylation, a reversible modification of intracellular proteins, influences on several cellular functions and is connected to many diseases including cancer. Glycosaminoglycan hyaluronan (HA) enhances tumor progression and in breast cancer HA accumulation associates strongly with poor outcome. In vitro studies have suggested that O-GlcNAcylation may enhance HA synthesis. The aim of this study was to investigate the correlations between O-GlcNAcylation, HA-related parameters, and disease outcome in a clinical breast cancer material consisting of 278 breast cancer cases.
Methods
In microscopic analyses, O-GlcNAc staining of the breast carcinoma cells was evaluated in several randomly picked high-power fields of each section. The extent of cytoplasmic O-GlcNAc staining was graded as either low or high according to the intensity of the staining and the percentage of stained cells. The extent of nuclear O-GlcNAc staining was categorized as either low or high according to the percentage of stained nuclei.
Results
A high extent of both cytoplasmic and nuclear O-GlcNAcylation correlated with an increased relapse rate, development of distant metastases, and poor outcome. A high extent of cytoplasmic O-GlcNAcylation correlated also with the accumulation of all hyaluronan synthase (HAS1-3) proteins and with a large amount of HA in the tumor stroma. In addition, a high extent of nuclear O-GlcNAcylation associated with obesity.
Conclusions
The results suggest a mechanistic association between increased O-GlcNAcylation and HA synthesis, leading to a HA-rich microenvironment favorable for breast cancer progression.
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Abbreviations
- FDG-PET:
-
18F-fluorodeoxyglucose-positron emission tomography
- HBP:
-
Hexosamine biosynthetic pathway
- UDP-GlcNAc:
-
Uridine diphosphate N-acetylglucosamine
- HA:
-
Hyaluronan
- HAS:
-
Hyaluronan synthase
- UDP-GlcUA:
-
Uridine diphosphate glucuronic acid
- HER2:
-
Human epidermal growth factor receptor 2
- OGT:
-
O-GlcNAc transferase
- OGA, MGEA5:
-
O-GlcNAcase
- PB:
-
Phosphate buffer
- BSA:
-
Bovine serum albumin
- ER:
-
Estrogen receptor
- PR:
-
Progesterone receptor
- BMI:
-
Body mass index
- DFS:
-
Disease-free survival
- OS:
-
Overall survival
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Acknowledgments
We thank Kari Kotikumpu and Eija Rahunen (Institute of Biomedicine, Anatomy, University of Eastern Finland, Finland) for technical help with O-GlcNAc immunostaining, Tuomas Selander (Science Service Center, Kuopio University Hospital, Finland) for assistance with the statistical analyses, and Ewen MacDonald for English language editing.
Funding
This study was supported by the Special Government Funding (EVO/VTR) of Kuopio University Hospital (Grant Nos. 5654132 and 5053101) and a Grant from Cancer Society of North Savo. The funders were not involved in the collection, management, or analysis of the data.
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Ethical approval for this study was provided by the Ethics Committee of the University of Eastern Finland and by the National Supervisory Authority for Welfare and Health. The execution of this study complies with the current laws of Finland.
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Tiainen, S., Oikari, S., Tammi, M. et al. High extent of O-GlcNAcylation in breast cancer cells correlates with the levels of HAS enzymes, accumulation of hyaluronan, and poor outcome. Breast Cancer Res Treat 160, 237–247 (2016). https://doi.org/10.1007/s10549-016-3996-4
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DOI: https://doi.org/10.1007/s10549-016-3996-4