Abstract
A web of interconnected and flexible metabolic pathways helps in maintaining cellular homeostasis. These flexible metabolic pathways are further deregulated to ensure cell survival during clinical conditions such as diabetes and cancer. In fact, complex metabolic programming is a hallmark of both diabetes and cancer. Normally, glucose absorbed by cells is catabolized through glycolysis to form pyruvate. Pyruvate fuels the citric acid cycle in the mitochondria of aerobic cells. Diabetic condition is presented with a battery of glycolytic abnormalities. Glucose-6-phosphate derived from glucose is converted back to glucose and pumped out of the cell. Similarly, pyruvate is also converted back to glucose. Import of glucose via GLUT4 is also impaired during diabetes. In spite of decelerated glycolysis, gluconeogenesis also occurs in diabetes. In diabetic settings, cells adapt to using acetyl-CoA derived from fatty acids to fuel citric acid cycle. Cancer cells also present with several metabolic abnormalities where glucose-6-phosphate powers pentose phosphate pathway and contribute ribose required for the rapid proliferation of transformed cells. Cancer cells convert pyruvate to lactate, which is transported out of cells. Glutamine provides the majority of anaplerotic carbon for the citric acid cycle, and acetyl-CoA derived from citrate contributes to the synthesis of fatty acids. Both 3-phosphoglycerate and pyruvate are spared for the synthesis of amino acids. In the case of diabetes, cells uptake very less glucose compared with normal cells, whereas in case of cancer, cells consume excess glucose due to aerobic glycolysis. In this chapter, we will discuss the major components of the metabolic deregulations in diabetes and cancer.
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Abbreviations
- ACC:
-
Acetyl-CoA carboxylase
- ACLY:
-
ATP citrate lyase
- ACS:
-
Acetyl-CoA synthetase
- ACTH:
-
Adrenocorticotropic hormone
- AGEs:
-
Advanced glycation end products
- AKT:
-
Serine-threonine protein kinase
- AMPK:
-
AMP-dependent protein kinase
- BRAF:
-
B-Raf proto-oncogene
- CCK:
-
Cholecystokinin
- CML:
-
Carboxymethyl-lysine
- c-Myc:
-
Cellular myelocytomatosis
- CREBP:
-
cAMP-response element-binding protein
- DAG:
-
Diacylglycerol
- ETC:
-
Electron transport chain
- FAS:
-
Fatty acid synthase
- G6P:
-
Glucose-6-phosphate
- G6PDH:
-
Glucose-6-phosphate dehydrogenase
- GLP1:
-
Glucagon-like peptide-1
- GLS1:
-
Glutaminase-1/L-glutaminase
- GLUT4:
-
Glucose transporter type 4
- GOLD:
-
Glyoxal-lysine dimer
- GPAT:
-
Glycerol-3-phosphate acyltransferase
- GSH:
-
Glutathione
- GSSG:
-
Glutathione disulfide
- HIF1α:
-
Hypoxia-inducible factor 1α
- IDH:
-
Isocitrate dehydrogenase
- IDO:
-
Indoleamine 2,3-dioxygenase
- IGFBP3:
-
Insulin-like growth factor-binding protein
- IKKb:
-
Inhibitory kB kinase b
- IRS:
-
Insulin receptor substrate
- LDHA:
-
Lactate dehydrogenase A
- MOLD:
-
Methylglyoxal-lysine dimer
- mTORC:
-
Mammalian target of rapamycin complex 1
- NF-kB:
-
Nuclear factor-kB
- α-KG:
-
α-ketoglutarate
- PC:
-
Pyruvate carboxylase
- PDH:
-
Pyruvate dehydrogenase
- PEPCK:
-
Phosphoenolpyruvate carboxykinase
- PFK:
-
Phosphofructokinase
- PHGDH:
-
Phosphoglycerate dehydrogenase
- PTEN:
-
Phosphatase and tensin homolog
- SCD:
-
Stearoyl-CoA desaturase
- SHMT1:
-
Serine hydroxymethyltransferase
- SREBP1:
-
Sterol response element-binding protein
- T1D and T2D:
-
Type 1 diabetes and type 2 diabetes
- TDO:
-
Tryptophan 2,3-dioxygenase
- TIGAR:
-
TP53-induced glycolysis and apoptosis regulator
- TPH1:
-
Tryptophan hydroxylase 1
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Acknowledgments
Authors thank Rajkishor Nishad, Lakshmi Prasanna, and Deepti Nabariya for their assistance during the preparation of this chapter.
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Pasupulati, A.K., Dunna, N.R., Talluri, S. (2019). Metabolic Adaptations in Diabetes Mellitus and Cancer. In: Nagaraju, G., BM Reddy, A. (eds) Exploring Pancreatic Metabolism and Malignancy. Springer, Singapore. https://doi.org/10.1007/978-981-32-9393-9_4
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DOI: https://doi.org/10.1007/978-981-32-9393-9_4
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