Abstract
Cancers show a metabolic shift towards aerobic glycolysis. By “corrupting” their microenvironment, carcinoma cells are able to obtain energy substrates to “fuel” their mitochondrial metabolism and cell growth in an autophagy-associated, paracrine manner. However, the metabolic changes and role of normal fibroblasts in this process remain unclear. We devised a novel, indirect co-culture system to elucidate the mechanisms of metabolic coupling between stromal cells and oral squamous cell carcinoma (OSCC) cells. Here, we showed that normal oral fibroblasts (NOFs) and OSCC become metabolically coupled through several processes before acquiring an activated phenotype and without inducing senescence. We observed, for the first time, that NOFs export mitochondria towards OSCCs through both direct contact and via indirect mechanisms. NOFs are activated and are able to acquire a cancer-associated fibroblasts metabolic phenotype when co-cultivation with OSSC cells, by undergoing aerobic glycolysis, secreting more reactive oxygen species (ROS), high l-lactate and overexpressing lactate exporter MCT-4, leading to mitochondrial permeability transition pore (mPTP) opening, hypoxia, and mitophagy. On the other hand, Cav-1-low NOFs generate l-lactate to “fuel” mitochondrial metabolism and anabolic growth of OSCC. Most interestingly, the decrease in AMPK activity and PGC-1α expression might involve in regulation of ROS that functions to maintain final energy and metabolic homeostasis. This indicated, for the first time, the existence of ATP and ROS homeostasis during carcinogenesis. Our study suggests that an efficient therapeutical approach has to target the multiple mechanisms used by them to corrupt the normal surrounding stroma and metabolic homeostasis.
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Availability of data and material
The data sets used and analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- OSCC:
-
Oral squamous cell carcinoma
- NOFs:
-
Normal oral fibroblasts
- CAFs:
-
Cancer-associated fibroblasts
- ROS:
-
Reactive oxygen species
- mPTP:
-
Mitochondrial permeability transition pore
- NOKs:
-
Normal oral epithelial cells
- FBS:
-
Fetal bovine serum
- BPE:
-
Bovine pituitary extract
- KSFM:
-
Serum-free keratinocyte specific medium
- DOK:
-
Dysplastic oral keratinocyte
- EGF:
-
Epidermal growth factor
- MTG:
-
MitoTracker Green
- TMRE:
-
Tetramethylrhodamine, ethyl ester
- FCCP:
-
Carbonyl cyanide 4-(trifluoromethoxy) phenylhydrazone
- PBS:
-
Phosphate-buffered saline
- MTDR:
-
MitoTracker Deep Red
- ROS:
-
Reactive oxygen stress
- DCFDA:
-
2′,7′-Dichlorofluorescin diacetate
- ATP:
-
Adenosine triphosphate
- ATPases:
-
ATP-degrading enzymes
- IHC:
-
Immunohistochemistry staining
- EMU:
-
Epithelium–stroma unit
- TNTs:
-
Tunneling nanotubes
- mPTP:
-
Mitochondrial permeability transition pore
- VDAC:
-
Voltage-dependent anion channel
- ECM:
-
Extracellular matrix
- MCTs:
-
Monocarboxylate transporters
- Alpha-SMA:
-
Alpha-smooth muscle actin
- FAP:
-
Fibroblast activation protein
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Acknowledgements
We thank Hanne Linda Nakkestad for excellent technical assistance. We also thank Molecular Imaging Centre (MIC) for outstanding facilities.
Funding
This work was partly supported by the Research Council of Norway through its Centres of Excellence funding scheme (DEC, project number 22325), the Western Health Authority (DEC grant nr. 911902/2013).
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XL, DEC, ZYZ, and JZG: conceptualization; XL, DEC, ZYZ, and JZG: methodology; DS, ZYZ, ZJG, LAB, RD, and SR: investigation; ZYZ and ZJG: writing—original draft; XL, DEC, ZYZ, LAB, and LJL: writing—review and editing; DEC and LAB: funding acquisition; HD, HP, SS, and LJL: resources; XL and DEC: supervision.
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The project was approved by the Committee for Ethics in Health Research of West Norway (REK nr. 2010/481); the study was performed in accordance with the Declaration of Helsinki. Tissues were acquired with written informed consent from all patients.
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Zhang, Z., Gao, Z., Rajthala, S. et al. Metabolic reprogramming of normal oral fibroblasts correlated with increased glycolytic metabolism of oral squamous cell carcinoma and precedes their activation into carcinoma associated fibroblasts. Cell. Mol. Life Sci. 77, 1115–1133 (2020). https://doi.org/10.1007/s00018-019-03209-y
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DOI: https://doi.org/10.1007/s00018-019-03209-y