胆宁片治疗豚鼠胆色素结石的实验研究

[目的]研究胆宁片治疗豚鼠胆色素结石的作用及机制。[方法]构建豚鼠胆色素结石模型,给予胆宁片小、中、大剂量治疗,治疗后观察豚鼠成石率,并用ELISA法测定血清中IL-15、IL-1β及胆汁中IL-15含量。[结果]胆宁片中、大剂量治疗后的豚鼠成石率较模型组下降,差异有统计学意义（P〈0.01）;与模型组比较,胆宁片各剂量组血清中IL-15、IL-1β及胆汁中IL-15含量减少,差异有统计学意义（P〈0.01）,且胆宁片各剂量组间比较差异也有统计学意义（P〈0.01）。[结论]胆宁片能有效治疗豚鼠胆色素结石,其机制与减少IL-15、IL-1β含量有关。     

Serologic study of experimental infections by Trypanosoma evansi, in guinea pigs

Sera of 20 guinea-pigs experimentally infected with Trypanosoma evansi were obtained in order to compare the efficacy of gel diffusion, indirect immunofluorescence and agglutination tests, to detect antibodies to T. evansi. The fluorescent antibody test was positive in six (6) animals and the antibody titres were very low (1:4 to 1:16). The agglutination test detected trypanosomal antibodies in sera one (1) week after infection. After two (2) weeks all animals were positive with high titres (1:8.000 to 1:250.000). Agglutination was inhibited when sera were treated with 2-Mercapto-ethanol. This fact suggests that IgM is the principal class of antibodies in sera of infected guinea-pigs. Precipitating antibodies were not detected during the course of infection.     

Rifampin in the treatment of experimental brucellosis in mice and guinea pigs.

Rifampin, a broad-spectrum antibiotic able to penetrate intracellularly, was used for treatment of infections with Brucella melitensis in mice and Brucella abortus in guinea pigs. Treatments were administered for seven, 14, or 21 days; mice were given 25 mg of rifampin/kg per day, and guinea pigs 100 mg/kg per day. Efficacy of the drug was determined by comparison of rifampin-treated animals with saline-treated controls and with tetracycline-treated mice (200 mg/kg per day) according to the following criteria: (1) primary infections of the spleen and (in guinea pigs) of the lymph nodes; (2) residual infections of the spleen, i.e., infections shown after complementary treatment with suspensions of killed Corynebacterium parvum or with cortisone; (3) splenomegaly; and (4) serological response (in guinea pigs). Treatment with rifampin, even for one or two weeks, drastically reduced the number of infections by all of these criteris, and treatment for three weeks cured nearly all mice; the incidences of primary and residual infections in rifampin-treated mice after three weeks were 0 and 8.5%, respectively, as compared with 70.3% and 73.5%, respectively, in tetracycline-treated mice. Of 25 guinea pigs treated with rifampin for three weeks, spleen infection was shown in one, and lymph node infections in 10.     

Blast cells transfer experimental hypersensitivity pneumonitis in guinea pigs

We previously demonstrated that experimental hypersensitivity pneumonitis (HP) can be transferred by lymph node cells (LNC) cultured in vitro with antigen. The purpose of this study was to identify the cells responsible for transfer and to determine if pulmonary cells can transfer HP. We cultured LNC from sensitized Strain 2 guinea pigs with a soluble extract of Micropolyspora faeni for 72 h, separated lymphoblasts from small lymphocytes, and transferred both subpopulations intravenously to syngeneic recipients. We also transferred irradiated lymphoblasts (1,500 rads), macrophage-depleted, lymphoblast-enriched populations, and pulmonary cells either without culture or after culture with M. faeni. Control animals received an equal volume of medium. All recipient animals were challenged intratracheally (i.t.) with M. faeni 48 h after the cell transfer, and they were killed 4 days after i.t. challenge. Randomly selected microscopic fields of the lung (250/animal) were judged to be normal or abnormal without knowledge of treatment. This measurement was reproducible (r = 0.95 for duplicate measurements, n = 55). All guinea pigs were maintained in HEPA-filtered air. There was a low level of pulmonary response to an i.t. challenge of M. faeni in animals that received medium. Animals that received pulmonary cells, either cultured or noncultured, did not differ from those in the control group. There was a substantial increase (p less than 0.01) in the extent of pulmonary abnormalities in the recipients of the lymphoblast population, with significant correlation (r = 0.87, p less than 0.01) between the number of lymphoblasts transferred and the extent of pulmonary abnormalities.(ABSTRACT TRUNCATED AT 250 WORDS)