Objective

2

To study the protective effect of different doses of single-flavored Coptis， Magnoliae Officinalis Cortex， and their compatibility on ulcerative colitis （UC） model rats and the colonic B lymphoblastoma-2 associated X protein （Bax） and cysteine-containing aspartame-3（Caspase-3） protein， inflammatory cytokines， and other expressions.

Method

2

The 120 healthy adult SD rats were randomly divided into blank group， model group， sulfasalazine group， Coptidis Rhizoma 2.00， 1.00， 0.50 g·kg

-1

group， Magnoliae Officinalis Cortex 2.00， 1.00， 0.50 g·kg

-1

group， Coptidis Rhizoma combine with Magnoliae Officinalis Cortex 4.00， 2.00， 1.00 g·kg

-1

group， 12 groups with 10 rats in each group. The UC model was prepared by 2，4， 6-trinitrobenzene sulfonic acid/ethanol （TNBS/ethanol）. After 24 h of modeling， the rats were gavaged at 10 mL·kg

-1

for one time/d. After modeling， the mental state， activity state， hair luster， stool characteristics， and blood in the stool of each group were observed. After continuous administration for 6 days， colon tissues and spleen were taken after the last administration for 24 h. The ratio of colonic weight to length and spleen index was calculated. The degree of colonic injury was evaluated according to the colonic mucosal injury index （CMDI） score criteria. the histopathological observation was performed using hematoxylin-eosin staining （HE）. The expression levels of tumor necrosis factor （TNF）-

α

， interleukin-6 （IL-6）， interleukin-10 （IL-10）， and myeloperoxidase （MPO） in the serum of Coptidis Rhizoma 2.00 g·kg

-1

group， Magnoliae Officinalis Cortex 2.00 g·kg

-1

group， Coptidis Rhizoma combine with Magnoliae Officinalis Cortex 4.00 g·kg

-1

were detected by enzyme-linked immunosorbent assay（ELISA） in blank group and model group. Western blot was used to detect the expression of Bax and Caspase-3 proteins in the colon of rats.

Result

2

Compared with blank group， rats in model group were sluggish and less active. The colon weight-length ratio， spleen index， CMDI， and colon tissue pathological damage increased significantly， and the expression of serum TNF-

α

， IL-6， and MPO increased significantly. Serum IL-10 expression levels were extremely significantly reduced （

P

<

0.01）. Compared with model group， the sulfasalazine group， the Coptidis Rhizoma 2.00， 1.00 g·kg

-1

group， the Magnoliae Officinalis Cortex 2.00 g·kg

-1

group， and the three-dose groups of Coptidis Rhizoma combine with Magnoliae Officinalis Cortex， their colon weight-length ratio and CMDI were significantly reduced （

P

<

0.05，

P

<

0.01）. The colon weight length ratio and CMDI index of the Coptidis Rhizoma 0.50 g·kg

-1

group， Magnoliae Officinalis Cortex 0.50 and 1.00 g·kg

-1

group were not significantly different from the model group but compared with Coptidis Rhizoma and Magnolia 0.50 g·kg

-1

group， the ratio of colon weight to length in the group of Coptidis Rhizoma combine with Magnoliae Officinalis Cortex 1.00 g·kg

-1

group was significantly reduced （

P

<

0.01）. Compared with model group， the spleen index of the sulfasalazine group， the Coptidis Rhizoma 2.00 g·kg

-1

， and the Coptidis Rhizoma combine with Magnoliae Officinalis Cortex 4.00 g·kg

-1

group were significantly lower

（P

<

0.05）， compared with model group， the sulfasalazine group， Coptidis Rhizoma 2.00， 1.00 g·kg

-1

and Magnoliae Officinalis Cortex 2.00 g·kg

-1

， thre dose groups of Coptidis Rhizoma combine with Magnoliae Officinalis Cortex can significantly improve the depth and scope of histopathological damage and tissue necrosis. Compared with the model group， the preferred Coptidis Rhizoma 2.00 g·kg

-1

group， Magnoliae Officinalis Cortex 2.00 g·kg

-1　

group， Coptidis Rhizoma combine with Magnoliae Officinalis Cortex 4.00 g·kg

-1

group serum TNF-

α

， IL-6， MPO expression levels are extremely significantly reduced， the level of IL-10 increased significantly （

P

<

0.01）．Compared with blank group， the expression of 　Bax and Caspase-3 protein in the colon of model group was significantly increased （

P

<

0.01）. Compared with model group， the expression of Bax and Caspase-3 protein in preferred Coptidis Rhizoma 2.00 g·kg

-1

group and Magnoliae Officinalis Cortex 2.00 g·kg

-1

group， Coptidis Rhizoma combine with Magnoliae Officinalis Cortex 4.00 g·kg

-1

group were significantly reduced （

P

<

0.01）．

Conclusion

2

The compatibility of single-flavored Coptidis Rhizoma， Magnoliae Officinalis Cortex， and Coptidis Rhizoma combine with Magnoliae Officinalis Cortex may improve the pathology of UC model rats induced by TNBS/ethanol by down-regulating the expression of Bax and Caspase-3 protein， inhibiting the release of inflammatory cytokines and promoting the release of anti-inflammatory factors injury， it plays a role in protecting colonic mucosa. The compatibility effect of Coptidis Rhizoma and Magnoliae Officinalis Cortex is better than that of single medicine， and Coptidis Rhizoma has a tendency to be better than Magnoliae Officinalis Cortex.