Objective

2

The effects of anemoside B

4

on endometritis rats were studied through

in vivo

and

in vitro

experiments.

Method

2

Animal experiments used 25% phenol glue to prepare endometritis models. 60 female SD rats were randomly divided into blank group， model group， Kushen gel group（0.005 g·kg

-1

），anemoside B

4

gel low，medium and high dose groups（0.005，0.01，0.02 g·kg

-1

），10 rats in each group，except for the blank group，rats in each group were injected with 25% phenol glue into their vagina every 2 days，and the modeling continued for 30 days. Administration started on the day after modeling. Anemoside B

4

gel low， medium and high dose groups were administered rectal daily，Kushen gel group was given daily vaginal administration. The blank group and model group were given the same amount of normal saline in the same way for 30 consecutive days. After the last administration，the uterus and its attachments of each group of rats were taken to analyze the uterine morphology and index. Hematoxylin-eosin （HE） staining was used to observe the pathological changes of rat uterus. Real-time PCR was used to detect tumor necrosis factor-

α

（TNF-

α

），interleukin-1

β

（IL-1

β

），and interleukin-6 （IL-6），signal transduction protein 130 （gp130），signal transduction and transcription activator 3 （STAT3）mRNA expression. Detection of IL-6 and STAT3 protein expression in rat uterus by Western blot. In cell experiments，lipopolysaccharide （LPS）was used to induce rat endometrial epithelial cells to prepare an in vitro inflammation model， and Real-time PCR was used to detect the expression of IL-6，gp130 and STAT3 mRNA in each group of rat endometrial epithelial cells.

Result

2

The results of animal experiments showed that compared with the blank group， the model group had inadequate uterine cavity adhesions， endometrial edema and hyperemia. Compared with model group， there was no adhesion in the uterine cavity of the rats in the high dose anemoside B

4

gel group and the Kushen gel group. The uterine tissue was relatively complete， and the uterine pathological structure was significantly improved. Compared with the blank group， the uterine index of the model group was significantly increased（

P

<

0.05）， the expression of IL-1

β

mRNA in the uterine tissue was significantly increased （

P

<

0.05）， the expression of mRNA and protein of IL-6 and STAT3 in the uterine tissue significantly increased （

P

<

0.05）. Compared with model group， the uterine index in anemoside B

4

gel high dose group was significantly reduced （

P

<

0.05）， and the mRNA and protein expression levels of IL-6 and STAT3 in the uterine tissue were significantly reduced （

P

<

0.05）. There was no statistically significant difference between the TNF-

α

and IL-1

β

mRNA expression compared with the model group. Cell experiment results showed that compared with the blank group， the mRNA expression of IL-6 and gp130 in model group endometrial epithelial cells was significantly increased （

P

<

0.01）， STAT3 mRNA expression was significantly increased （

P

<

0.05）. Compared with model group， the mRNA expression levels of IL-6， gp130 and STAT3 in anemoside B

4

high dose group decreased significantly （

P

<

0.05）.

Conclusion

2

Anemoside B

4

can improve the inflammatory response of chronic endometritis in rats and reduce the release of inflammatory factor IL-6. The mechanism may be related to the down-regulation of IL-6/STAT3 pathway.