AIM AND METHODSBoth PGE2 and cAMP are important neural mediator of fever. In order to discuss if PGE2 and cAMP are involved in the antipyretic mechanism of baicalin, fever models of rats were made by i.v. injection of endotoxin (ET). The antipyretic action and effects of baicalin on contents of PGE2 and cAMP in hypothalamus were observed.

RESULTSBaicalin possessed obvious antipyretic effect on fever rats and reversed the effect of ET on contents of PGE2 and cAMP in hypothalamus. Correlation analysis showed that contents of PGE2 and cAMP in hypothalamus were positively correlated with the change of body temperature of rats.

CONCLUSIONBaicalin may exert its antipyretic effect on fever rats by inhibiting increase of contents of PGE2 and cAMP in hypothalamus.

Animals ; Cyclic AMP ; metabolism ; Dinoprostone ; metabolism ; Fever ; metabolism ; Flavonoids ; pharmacology ; Hypothalamus ; drug effects ; metabolism ; Male ; Rats ; Rats, Wistar

OBJECTIVE: To investigate the expression of miR-451 during erythroid differentiation and its correlation with hematological diseases. METHODS: The expression of miR-451 in erythroid differentiation of mouse hematopoietic stem cells (derived from fetal liver) was analyzed by cell culture, flow cytometry, magnetic bead sorting and qRT-PCR. The expression of miR-451 during erythroid differentiation of mouse erythroid leukemia cells (MEL) was analyzed by cell culture and qRT-PCR. The expression of miR-451 in peripheral blood of mice was detected by qRT-PCR, and the expression of miR-451 in fetal liver (14.5 days) was analyzed by microarray. The nucleated erythroid cells from bone marrow of wild type (WT) mice and β-thalassemia (β-thal) mice were sorted by flow cytometry, and the levels of miR-451 and erythroid genes were detected by qRT-PCR. The expression of miR-451 in peripheral blood of patients with clinical hematological diseases was detected by qRT-PCR. RESULTS: During the differentiation of mouse hematopoietic stem cells (derived from fetal liver) and MEL cells, the expression levels of miR-451 increased gradually. Compared with WT mice, the expression levels of miR-451 in peripheral blood, 14.5-day fetal liver cells and nucleated erythroid cells (sorted from bone marrow) of β-thal mice were significantly increased(P<0.05). Many erythroid differentiation genes in nucleated erythroid cells (sorted from bone marrow) of β-thal mice decreased. Compared with healthy controls, the expression levels of miR-451 was increased in peripheral blood of patients with β-thalassemia and iron deficiency anemia, while the expression levels of miR-451 was decreased in patients with aplastic anemia and myelodysplastic syndrome. CONCLUSION During erythroid differentiation, the expression levels of miR-451 increases gradually. In hematological diseases, the expression levels of miR-451 is different from that of normal controls, which is expected to become an auxiliary diagnostic index for clinical hematological diseases.
Mice ; Animals ; beta-Thalassemia/genetics* ; Cell Differentiation ; MicroRNAs/genetics*