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AIM: To study the effects of transmitters ET, AgII, PGI2,CGRP and GG on experimental rat hepatic fibrosis and the antifibrogenic effects of IL-10.METHODS: One hundred SD rats were randomly divided into 3 groups: control group (N): intraperitoneal injection a week; IL-10 treated group (E): besides same dosage of the third week. In the fifth, the seventh and the ninth week,rats in three groups were selected randomly to collect plasma and liver tissues. The levels of ET, AgII, PGI2, CGRP and GG were assayed by radioimmunoassay (RIA). The liver fibrosis was observed with silver staining.RESULTS: The hepatic fibrosis was developed with the increase of the injection frequency of CCl4. The ET, AgII, PGI2, CGRP The histological examination showed that the degrees of the rats liver fibrosis in group E were lower than those in group C.CONCLUSION: The transmitters ET, AgII, PGI2, CGRP and GG play a significant role in the rat hepatic fibrosis induced by CCl4. IL-10 has the antagonistic action on these transmitters and can relieve the degree of the liver fibrosis.