AIM　To study the synthesis of zinc chlorin e4 (1), its experimental antigastrelcosis activity as well as the protection against acute liver injuries. METHODS　Chlorin e6 (3) was prepared through acidic and alkaline oxidative degradation using silkworm excrement crude chlorophyll extracts as starting material. Compound 1 was synthesized via Zn(OAc)2 complex action with Chlorin e4 (2) which was prepared by refluxing 3 in pyridine. Gastric ulcers were induced by abdominal injection of 0.2% indomethacin at 20 mg.kg-1 in rats. The ulcer indexes and ulcer numbers in gastric mucosa were determined. Acute liver injuries were induced by abdominal injection of 0.3% thioacetamide (TAA) or 0.3% CCl4 at 20 mg.kg-1 in mice, and activities of SGPT in mice were determined. RESULTS　Compound 1 is previously unknown. Compared with control group, abdominal administration of 1 at 100 mg.kg-1 reduced significantly the gastric ulcer index (P<0.001) and the number of ulcer (P<0.001) induced by indomethacin in rats. Abdominal administration of 1 at 100 mg.kg-1×3 exhibited marked inhibitory effects on elevated activities of SGPT induced by TAA (P<0.02) or CCl4 (P<0.01) in mice. CONCLUSION　These results show that 1 has significant protective effect against indomethacin-induced gastric lesion in rats and TAA or CCl4 induced acute liver injuries in mice. It is suggested that 1 may be a promising new drug candidate for antigastrelcosis and liver injury protection.

BACKGROUND:Fetal bovine serum as nutritional support is often used in the traditional cel culture. Consequently, a host of potential problems such as the spread of disease and immunological reactions exist. To find a suitable fetal bovine serum substitute and to establish a culture system of human bone marrow stromal stem cels in vitro which has been standardized, safe and efficient has just started. OBJECTIVE:To investigate the effects of different serums on proliferation of bone marrow stromal stem celsin vitro. METHODS:Bone marrow stromal stem cels were obtained from adult bone marrow, which were cultured in DMEM containing 10% AB serum, 10% autologous serum, or 10% fetal bovine serum. Cels at passage 3 were used in this study. RESULTS AND CONCLUSION:The cel confluence in the AB serum group was earlier than that in the fetal bovine serum group and autologous serum group. Human bone marrow stromal stem cels maintained the phenotypes of bone marrow stem cels in three serums detected by flow cytometry. AB serum group showed the highest fluorescence intensity and the most efficiency of cel proliferation which examined by the AlamarBlue assay. Apoptosis rate was < 5% in al the three groups, and cels grew wel in these serums. Alkaline phosphatase, calcium nodules and oil red O staining showed that the cels maintained the osteogenesis and adipogenesis capacity in the three groups. AB serum was found to have a better effect on proliferation capability of cels than fetal bovine serum and autologous serum. Taken together, AB serum is expected to be a substitute of fetal bovine serum to build anin vitro culture system of adult bone marrow stromal stem cels that accord with the clinical requirements of bone tissue engineering.