氨基酸對(duì)抗真菌藥物的影響及其機(jī)制研究
[Abstract]:The incidence of fungal infection caused by Candida albicans has risen sharply. The clinical effects of improving fungal infection include increasing dose, changing drug types, two drugs or combination of various drugs. The combination of two drugs has many advantages, such as reducing the dose of toxic drugs, improving the effect of drug treatment, and increasing resistance. Fungal spectrum, retarding the occurrence of fungal resistance and so on. Amino acids are very active in clinical treatment, such as the use of Lysine Hydrochloride and Sodiun Chloride Injection for cerebral blood supply deficiency, acetylcysteine used in the treatment of chronic bronchitis, and the use of vitamin u- methionine in the treatment of ulcerative diseases, and so on. Therefore, amino acids are likely to be one of the sources of antifungal agents. We use lysine and cysteine as the research object to further study the effect and possible mechanism of lysine and cysteine enhanced amphotericin B on Candida albicans. This topic mainly through the interaction of amino acids and antifungal agents. Objective: to find a safe and effective combination regimen for treating fungal infections.
In this study, we examined the effects of exogenous amino acids on the antifungal agents, which showed that cysteine could significantly inhibit the growth of Candida albicans. The combined use of different amino acids and different antifungal agents had different effects on the growth of Candida albicans in vitro. (1) amino acids and caspofungin (CAS). The results of the combined interaction: cysteine, lyophile, shiny, semen, egg, egg, silk, bright, Gump, Gump, phenylpropyl, cheese, proline can significantly enhance the effect of CAS on Candida albicans, and aspartic acid can antagonize the effect of CAS on Candida albicans; and the results of the interaction between amino acids and miconazole (miconazole, MCZ): cysteine can significantly enhance the MCZ against white The effect of Candida, serine and methionine can antagonize the effect of MCZ on Candida albicans; (3) the interaction results of amino acids and amphotericin B (amphotericin B, AmB): cysteine, Lai, Su, shiny, sperm, eggs, bright, group, and proline can significantly enhance the effect of A "mB on Candida albicans, ornithine, tyrosine can antagonize AmmB against Candida albicans." The interaction between the amino acid and 5- fluorocytosine (5-Flucytosine, 5-Fu): cysteine, aspartic acid, and glutamic acid can significantly enhance the effect of 5-Fu on Candida albicans. Tryptophan and valine can antagonize the effect of 5-Fu on Candida albicans; 5. The interaction of amino acid and terbinafine, TER. Results: cysteine, Su, arginine can significantly enhance the effect of TER on Candida albicans. Methyl sulphur, asparagus, valley, phenylpropyl, C, tryptophan can antagonize the effect of TER on Candida albicans; 6. The interaction results of amino acids and shikonin (SK) combined: cysteine, sou, ISO, semen, eggs, phenylpropyl, color, birds, Gump, silk, and alanine can significantly enhance SK The role of Candida albicans, aspartic acid and leucine, can antagonize the action of SK on Candida albicans.
The effects of 20 different amino acids on the growth of Candida albicans and the effect of interaction with different antifungal agents on the growth of Candida albicans were detected by microdilution method. The results showed that cysteine could significantly inhibit the growth of Candida albicans. The inhibitory effect of threonine on the growth of Candida albicans was weak, and other amino acids were found. The growth of Candida albicans was not inhibited. Different amino acids and antifungal drugs had different effects on the growth of Candida albicans.
In the second part, the effects of lysine, cysteine alone and combined with AmB on Candida albicans and other strains were investigated. The antifungal effect of lysine on AmB and the antifungal effect of cysteine on AmB were further investigated through the experiment of spot assay, growth curve and survival rate. The experiment selected Candida albicans as the object of study, and the use of microsatellite in the experiment. 0.5mM lysine could enhance the anti Candida albicans effect of 0.25 mu g/ml by measuring the solution based lysine; 0.25mM cysteine could inhibit the growth of Candida albicans and enhance the effect of 0.25 mu g/ml AmB on Candida albicans. Similarly, 1mM lysine could enhance 0.5 mu g/ml AmB to nalaciasa (04013803929001822090220190201309). The antifungal effect of Cryptococcus neoformans 0201309, 0.25mM cysteine could affect Candida korubica ACCT2159, Candida smooth ACCT28226, and nearly smooth Candida 22090 growth.Spot aasay experimental results showed that the lysine group had no difference with the blank group, and the consistency of 8mM lysine above and 0.25 mu g/ml AmB could inhibit the growth of Candida albicans. Long, 1mM cysteine could inhibit the growth of Candida albicans. The growth curve also showed that the combination of 1mM lysine and 0.25 mu g/ml AmB could strongly inhibit the growth of Candida albicans compared with 0.25 mu g/ml AmB. We also examined the effect of AmB and lysine on the formation of the biofilm by the XTT reduction method. The results showed that 0. The combination of 5 g/ml AmB with 4mM lysine has strong inhibition on the formation of Candida albicans biofilm and the metabolic activity of biofilm cells. At the same time, mycelium growth proves that the effect of lysine and AmB on Candida albicans biofilm may be due to the inhibition of mycelium formation.
In the third part, the synergistic mechanism of lysine and AmB was studied. The main method was the transmission electron microscope to observe the effect of two drugs on the ultrastructure of Candida albicans. Flow cytometry was used to observe the effect of the combined use of two drugs on the cell cycle, and the production of ROS in the combined cells was detected by the multi-function microplate detector. Measurement of the mitochondrial membrane potential level after the combined use of two drugs by the JC-1 kit, the effects of AmB and lysine on the oxidative damage of Candida albicans were investigated. The results showed that AmB could increase the level of endogenous reactive oxygen species in Candida albicans, while AmB and lysine were used in the combination of lysine and lysine. There was no significant difference from that in the blank group; at the same time, we also used Real-time RT-PCR to investigate the expression of redox related genes. The results showed that compared with the AmB single use group, AmB and lysine combined with ROS scavenging related gene Sod2 expression level decreased, further promoting the accumulation of endogenous ROS in Candida albicans: however, compared with the AmB single use group, The expression levels of AmB and lysine combined with oxidative stress related genes (TRR1, CaMCA1, Cap1, GRP2) were all up regulated in varying degrees, and the oxidative stress of Candida albicans increased. In addition, AmB could reduce the level of lysine in the mitochondrial membrane potential of Candida albicans, while the mitochondrial membrane potential of Candida albicans with AmB and lysine was lower than that of lysine, lysine group and lysine group. There was no obvious difference in the blank group. Compared with the AmB single use group, the membrane in the cell division of lysine and AmB group was not obvious, even disappeared, the cell cycle was blocked in the G2/M phase, and the cell mitosis was blocked. There was no significant difference between the single use group and the blank group.
In the fourth part, the results of the study in vivo showed that cysteine alone had no therapeutic effect on systemic Candida albicans in mice, but cysteine combined with amphotericin B was better than the effect of amphotericin B alone, which was consistent with the effect in vitro.
To sum up, the study found that a variety of amino acids and antifungal agents have synergistic effect in vitro; cysteine has strong antifungal activity and can enhance the antifungal activity of AmB on Candida albicans in vivo and in vitro; lysine can enhance the sensitivity of Candida albicans to AmB in vitro. The main mechanism of which is to prevent cells from the cells. The formation of the septum during the division, the G2/M phase in the cell cycle, the increase of intracellular reactive oxygen species and the decrease of the mitochondrial membrane potential, and the combination of lysine and AmB can cause some changes in the expression of redox related genes.
【學(xué)位授予單位】:第二軍醫(yī)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類(lèi)號(hào)】:R96
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