Abstract: Objective: To study the effects of Angelicaesinensis radix (Danggui) decoction on the therapeutic action and the colonic morphology and mucus secretion in XuexuBianmi model mice. Methods: Sixty Kunming mice, maleandfemaleinhalf, were randomly divided into six groups according to gender and weight (n=10):normal control group, XuexuBianmi model group, positive control group, and high-dose, middle-dose and low-dose Danggui groups. Except the normal control group, the mice in the rest groups were orally administrated with diphenoxylate (DPN) and subcutaneously injected with acetylphenyhydrazine (APH) and intraperitoneally injected with cyclophosphamide (CPA) to copy XuexuBianmi model. Fromthe 14th day, the mice in Danggui groups were orally administered with different doses of Danggui decoction (16.67、8.33、4.17 g/kg), the mice in positive control group were orally administered with Changtongshu granule (5 g/kg), the mice in XuexuBianmi model group were administered with normal saline (NS) at the same volume (10 ml/kg), once a day for consecutive 28 days. The general status were observed, the first black defecation time (FBDT), the water content in stool and in colon in mice of all groups were tested. And the colon tissue was stained with hematoxylin-eosin (HE) and AB-PAS to observe the changes of colonic morphology and the mucus secretion. Results: Compared with the normal control group, there appeared the XuexuBianmi syndromes in model group as follows, the defecation time (FBDT) was significantly prolonged, the water contentinstool and in colon were decreased (P<0.01), the colonic mucosa and gland were atrophied, mucous membrane layer was thinned (P<0.01), mucus secretion was decreased. Compared with the XuexuBianmimodel group, the Xuexu and Bianmi syndromes were improved, the FBDT was significantly shortened (P<0.05, P<0.01), the water content of colon was increased in the three groups of Danggui decoction (P<0.05, P<0.01). The water content of the stool was obviouslyincreased in groups of 16.67and 8.33kg.dDanggui decoction (P<0.05). The atrophy of colon mucosa and gland was improved, the mucus secretion was increased, and the colon lubrication function was improved in the three groups in different doses of Danggui decoction. Conclusion: Dangguican improve the mucosal atrophy, and increase the secretion of colonic mucus, then the stool is softened and promoted to discharge.

Key words: Xuexu Bianmi, mice, Angelica sinensis radix, colonic morphology, colonic mucus secretion