Angelica sinensis polysaccharide (ASP) efficiently stimulates erythropoietin secretion and suppresses the liver's hepcidin expression, potentially aiding in treatments of hepcidin-induced diseases.
In observing the effects of ASP, a substance derived from a plant used in traditional Chinese medicine, the researchers administered the substance daily to rats through intragastric methods for a period of 14 days. Apart from this, a group of positive control rats also received injections of recombinant human erythropoietin. The researchers then monitored the levels of erythropoietin and hepcidin in the serum at various times using an enzyme-linked immunosorbent assay. Additionally, the researchers used the Western blot method to examine the expression of six key signal proteins in the liver.
The results revealed that ASP notably diminished the liver's expression of hepcidin, a factor known for negatively regulating the body's iron metabolism. This reduction was primarily facilitated through inhibiting the expression of specific liver proteins (STAT3/5 and SMAD4) and stimulating the secretion of erythropoietin. This stimulation led to further down-regulation of hepcidin, a process aided by reducing the liver's expression of other proteins (C/EBPα, SMAD4, and the phosphorylation process of STAT3/5). Hence, the research suggests ASP can effectively suppress hepcidin expression in normal rats.
