OBJECTIVE

2

To study the toxic mechanism of Mahuang xixin fuzi decoction （MXF） on normal mice.

METHODS

2

Totally 48 SPF grade BABL/C mice were randomly divided into blank group， MXF low-dose， medium-dose and high-dose groups， with 12 mice in each group. MXF low-dose， medium-dose and high-dose groups were given drug intragastrically at the dose of 11.262， 33.786， 45.050 g/kg， respectively. Blank group was administered with equal volume of normal saline， once a day， for consecutive 7 d. The body weight， anal temperature and survival rate were recorded， organ index and serum biochemical factors were detected. After the last administration， fecal samples of mice were collected and detected by UHPLC-QE/MS.

RESULTS

2

Compared with blank group， the body weight was decreased significantly from the 3rd to the 5th day after administration in MXF medium-dose group， and from the 2nd to the 7th day after administration in MXF high-dose group significantly （

P

＜0.05）. There was no significant difference in anal temperature among the treatment groups； the average survival rates of MXF medium-dose and high-dose groups were 58.33% and 50.00%， respectively. Compared with blank group， there were significant difference in the indexes of spleen， lung， thymus， adrenal gland and creatine kinase in MXF low-dose， medium-dose and high-dose groups， the testis index in MXF low-dose and high-dose groups， the creatine kinase isoenzyme/creatine kinase ratio in MXF low-dose group， the

α

-hydroxybutyrate dehydrogenase， lactate dehydrogenase and alkaline phosphatase in MXF medium-dose group， the urine and cystatin C in MXF medium-dose and high-dose groups （

P

＜0.05）. The fecal metabonomic analysis showed that 19 biomarkers such as phenylpyruvate， L-tyrosine， phos

phatidylcholine， glycerol 3-phosphate in MXF low-dose， medium-dose and high-dose groups were significantly different from those in the blank group.

CONCLUSIONS

2

When MXF reaches a certain dose， it will have adverse effects on the body weight， multiple organs and serum biochemical indicators of mice， thus showing a certain toxic effect. Its mechanism may be related to disrupting the intestinal flora metabolism， causing inflammatory reaction and immune disorders.