The role of asparagine synthetase on nutrient metabolism in pancreatic disease. 2020

Cheng-Yu Tsai, and Michael S Kilberg, and Sohail Z Husain
Division of Gastroenterology, Department of Pediatrics, Stanford University, Stanford, CA, USA. Electronic address: otsai@stanford.edu.

The pancreas avidly takes up and synthesizes the amino acid asparagine (Asn), in part, to maintain an active translational machinery that requires incorporation of the amino acid. The de novo synthesis of Asn in the pancreas occurs through the enzyme asparagine synthetase (ASNS). The pancreas has the highest expression of ASNS of any organ, and it can further upregulate ASNS expression in the setting of amino acid depletion. ASNS expression is driven by an intricate feedback network within the integrated stress response (ISR), which includes the amino acid response (AAR) and the unfolded protein response (UPR). Asparaginase is a cancer chemotherapeutic drug that depletes plasma Asn. However, asparaginase-associated pancreatitis (AAP) is a major medical problem and could be related to pancreatic Asn depletion. In this review, we will provide an overview of ASNS and then describe its role in pancreatic health and in the exocrine disorders of pancreatitis and pancreatic cancer. We will offer the overarching perspective that a high abundance of ASNS expression is hardwired in the exocrine pancreas to buffer the high demands of Asn for pancreatic digestive enzyme protein synthesis, that perturbations in the ability to express or upregulate ASNS could tip the balance towards pancreatitis, and that pancreatic cancers exploit ASNS to gain a metabolic survival advantage.

UI MeSH Term Description Entries
D010182 Pancreatic Diseases Pathological processes of the PANCREAS. Disease, Pancreatic,Diseases, Pancreatic,Pancreatic Disease
D010195 Pancreatitis INFLAMMATION of the PANCREAS. Pancreatitis is classified as acute unless there are computed tomographic or endoscopic retrograde cholangiopancreatographic findings of CHRONIC PANCREATITIS (International Symposium on Acute Pancreatitis, Atlanta, 1992). The two most common forms of acute pancreatitis are ALCOHOLIC PANCREATITIS and gallstone pancreatitis. Acute Edematous Pancreatitis,Acute Pancreatitis,Pancreatic Parenchyma with Edema,Pancreatic Parenchymal Edema,Pancreatitis, Acute,Pancreatitis, Acute Edematous,Peripancreatic Fat Necrosis,Acute Edematous Pancreatitides,Acute Pancreatitides,Edema, Pancreatic Parenchymal,Edematous Pancreatitides, Acute,Edematous Pancreatitis, Acute,Fat Necrosis, Peripancreatic,Necrosis, Peripancreatic Fat,Pancreatic Parenchymal Edemas,Pancreatitides, Acute,Pancreatitides, Acute Edematous,Parenchymal Edema, Pancreatic,Peripancreatic Fat Necroses
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000078622 Nutrients Various components of food that are required for nourishment. Macronutrients,Macronutrient,Nutrient
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001216 Asparagine A non-essential amino acid that is involved in the metabolic control of cell functions in nerve and brain tissue. It is biosynthesized from ASPARTIC ACID and AMMONIA by asparagine synthetase. (From Concise Encyclopedia Biochemistry and Molecular Biology, 3rd ed) L-Asparagine
D001217 Aspartate-Ammonia Ligase An enzyme that catalyzes the formation of asparagine from ammonia and aspartic acid, in the presence of ATP. EC 6.3.1.1. Asparagine Synthase,Asparagine Synthetase,Asparagine Synthetase B,Aspartate Ammonia Ligase,Ligase, Aspartate-Ammonia,Synthase, Asparagine,Synthetase B, Asparagine,Synthetase, Asparagine

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