Search

With the aim of finding natural anthelmintic agents against Dactylogyrus intermedius (Monogenea) in goldfish ( Carassius auratus), 26 plants were screened for antiparasitic properties using in vivo anthelmintic efficacy assay. The results showed that Caesalpinia sappan, Lysima chiachristinae, Cuscuta chinensis, Artemisia argyi, and Eupatorium fortunei were found to have 100 % anthelmintic efficacy at 125, 150, 225, 300, and 500 mg L −1 after 48 h of exposure. Crude extract of the five plants were further partitioned with petroleum ether, chloroform, ethyl acetate, methanol, and water to obtain anthelmintically active fractions with various polarity. Among these fractions tested, the ethyl acetate extract of L. chiachristinae was found to be the most effective with a 50 % effective concentration (EC 50) value of 5.1 mg/L after 48 h of exposure. This was followed by ethyl acetate extract of C. chinensis (48 h-EC 50 = 8.5 mg L −1), chloroform extracts of C. sappan (48 h-EC 50 = 15.6 mg L −1), methanol extract of C. chinensis (48 h-EC 50 = 15.9 mg L −1), and chloroform and petroleum ether extract of L. chiachristinae (EC 50 values of 17.2 and 21.1 mg/L, respectively), suggesting that these plants, as well as the active fractions, provide potential sources of botanic drugs for the control of D. intermedius in aquaculture. [ABSTRACT FROM AUTHOR]

The purpose of the present study was to assess the anthelmintic property of plant-derived polyphenolic compounds extracted and isolated from Dryopteris crassirhizoma against Dactylogyrus intermedius in goldfish. The active ethyl acetate extract was loaded on an open silica gel column and eluted with chloroform–methanol. According to 1H-nuclear magnetic resonance (NMR), 13C-NMR, and mass spectral data, the structures of three purified compounds were identified as protocatechuic acid, sutchuenoside A, and kaempferitrin. Among these compounds, sutchuenoside A and kaempferitrin were observed to be effective with median effective concentration (EC 50) of 3.01 and 2.71 mg L −1, respectively. The alterations in the tegument of the parasites treated with isolated compound were examined using scanning electron microscopes. Ultrastructural micrographs revealed shrinkage of body surface, dense tegumental folds, and disheveled protuberances. The structural deformities in the treated parasites were indicative of an efficient anthelmintic activity of the isolated compound kaempferitrin. In addition, the 48-h median lethal concentration for sutchuenoside A and kaempferitrin against goldfish were 12.03- and 11.98-fold higher than corresponding EC 50. The present results showed that ethyl acetate extract of D. crassirhizoma may be considered as a potent source, and sutchuenoside A and kaempferitrin as new natural parasitic agents against D. intermedius. [ABSTRACT FROM AUTHOR]

Dactylogyrus ctenopharyngodonid and Ichthyophthirius multifiliis are 2 important ectoparasites of fish. Both parasites can induce an immune response in fish that leads to a decrease in parasitic infection intensity and the development of resistance against parasitic reinfection. The present study evaluated whether grass carp Ctenopharyngodon idella that survived a D. ctenopharyngodonid infection could develop immunity against infection by D. ctenopharyngodonid and I. multifiliis. The results demonstrated that when grass carp were infected with D. ctenopharyngodonid, the number of red blood cells and the percentages of thrombocytes, monocytes, and neutrophils in the white blood cells increased significantly in the early stage of infection. The percentage of lymphocytes increased over time following parasitic infection. The mean infection intensity of D. ctenopharyngodonid decreased to 0 on Day 28. The activities of serum acid phosphatase, alkaline phosphatase, lysozyme, and superoxide dismutase increased significantly after D. ctenopharyngodonid infection. In addition, the grass carp that survived a previous D. ctenopharyngodonid infection could completely resist D. ctenopharyngodonid reinfection and partially resist I. multifiliis infection.

Infection by Ichthyophthirius multifiliis, a ciliated protozoan parasite, results in high fish mortality and causes severe economic losses in aquaculture. To find new, efficient anti-I. multifiliis agents, cynatratoside-C was isolated from Cynanchum atratum by bioassay-guided fractionation in a previous study. The present study investigated the anti-theront activity, determined the toxicity of cynatratoside-C to grass carp Ctenopharyngodon idellus and mammalian blood cells, and evaluated the protection of cynatratoside-C against I. multifiliis theront infection in grass carp. Results showed that all theronts were killed by 0.25 mg l-1 of cynatratoside-C in 186.7 ± 5.8 min. Cynatratoside-C at 0.25 mg l-1 was effective in treating infected grass carp and protecting naive fish from I. multifiliis infestation. The 96 h median lethal concentration (LC50) of cynatratoside-C to grass carp and 4 h median effective concentration (EC50) of cynatratoside-C to theront were 46.8 and 0.088 mg l-1, respectively. In addition, the hemolysis assay demonstrated that cynatratoside-C had no cytotoxicity to rabbit red blood cells. Therefore, cynatratoside-C could be a safe and effective potential parasiticide for controlling I. multifiliis.

Objective: To analyze the effects and side effects of paclitaxel liposome formula on breast cancer and non-small cell lung cancer, compared with traditional taxol., Methods: 129 patients from multicenters were prospectively randomized into a test group, given paclitaxel liposome at 135 mg/m(2) each session, and a control group, given traditional taxol at 135 mg/m(2) each session. Both groups received these regimens combined with ADM or DDP for two cycles (3 weeks per cycle)., Results: Of 129 cases, 128 were eligible for the analysis of side effects and 126 for the overall response rate. The complete remission rate, partial remission rate and overall response rate were 1.6%, 33.3%, 34.9% in the test group and 6.3%, 22.2%, 28.6% in the control group. There was no significant difference between the two groups. Though there was no significant difference in hematological toxicity between the two groups, the toxicity from the mixed solvent of polyethoxylated castor oil and ethanol was significantly lower in the test group than that in the control group., Conclusion: Paclitaxel liposome combined with ADM or DDP in the treatment of advanced breast cancer and non-small-cell lung cancer, being similarly effective as taxol, can significantly lower the incidence of serious hypersensitive reactions.