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Adropin - physiological and pathophysiological role.

Adropin is a peptide hormone that was discovered in 2008 by Kumar et al. This protein consists of 76 amino acids, and it was originally described as a secreted peptide, with residues 1-33 encoding a secretory signal peptide sequence. The amino acid sequence of this protein in humans, mice and rats is identical. While our knowledge of the exact physiological roles of this poorly understood peptide continues to evolve, recent data suggest a role in energy homeostasis and the control of glucose and fatty acid metabolism. This protein is encoded by the Enho gene, which is expressed primarily in the liver and the central nervous system. The regulation of adropin secretion is controversial. Adropin immunoreactivity has been reported by several laboratories in the circulation of humans, non-human primates and rodents. However, more recently it has been suggested that adropin is a membrane-bound protein that modulates cell-cell communication. Moreover, adropin has been detected in various tissues and body fluids, such as brain, cerebellum, liver, kidney, heart, pancreas, small intestine, endothelial cells, colostrum, cheese whey and milk. The protein level, as shown by previous research, changes in various physiological and pathophysiological conditions. Adropin is involved in carbohydrate-lipid metabolism, metabolic diseases, central nervous system function, endothelial function and cardiovascular disease. The knowledge of this interesting protein, its exact role and mechanism of action is insufficient. This article provides an overview of the existing literature about the role of adropin, both in physiological and pathophysiological conditions.