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阴道念珠菌菌种及香莲方逆转白念珠菌耐药基因组学研究
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摘要
目的:
     主要由白念珠菌引起的外阴阴道念珠菌病是临床常见病、多发病。本研究的主要目的包括:1.了解VVC(包括RVVC)的菌种分布和药敏情况;VVC(包括RVVC)患者的自觉症状(瘙痒和疼痛)与菌种(白念珠菌、非白念珠菌)的关系;2.观察香莲外洗液对白念珠菌耐药菌株的逆转作用;3.从基因水平,揭示香莲外洗液抗真菌的作用机理。
     方法:
     1.采集广东省中医院皮肤性病科及妇科符合外阴阴道念珠菌病诊断标准的119例患者的白带标本,通过菌种鉴定和药敏检测,了解外阴阴道念珠菌病的菌种分布及药敏情况;通过对瘙痒和疼痛等临床症状进行轻、中、重度的划分并进行统计,明确菌群分布(白念珠菌、非白念珠菌)的不同是否会影响临床症状的严重程度。
     2.将香莲外洗液作用于白念珠菌耐药标准株CA17,按照美国临床和实验室标准协会(clinical and laboratory standards institute, CLSI)提出的标准(M27-A3方案),采用肉汤微量稀释法测定氟康唑对原代及每代菌株的MIC值,从而判断不同条件下白念珠菌耐药标准株CA17恢复对氟康唑敏感所需的代数。
     3.运用现代分子生物学基因分析相关技术对相关菌株进行多靶点超高通量筛选,通过对原代耐药株、自然转种转变为敏感株的白念珠菌菌株与香莲外洗液作用下转变为敏感株的白念珠菌菌株进行转录组测序,在基因水平揭示香莲外洗液对白念珠菌作用的分子机制,从而揭示香莲外洗液的作用机理。
     结果:
     1.本研究通过对119例外阴阴道念珠菌病患者的阴道白带标本进行检测,发现白念珠菌97株(81.51%),其次为光滑念珠菌18株(15.13%),热带念珠菌2株(1.68%),近平滑念珠菌2株(1.68%)。药敏试验研究发现,两性霉素B对菌群的敏感性最强,其次依次是伏立康唑、氟康唑、5-氟胞嘧啶、伊曲康唑;本研究对由白念珠菌和非白念珠菌所导致的VVC患者的瘙痒及疼痛严重程度分别进行研究,发现,二者评分差异均无统计学意义(P>0.05)。
     2.经香莲外洗液作用后,白念珠菌标准耐药菌株CA17于第6代恢复对氟康唑敏感,而无香莲作用的耐药白念珠菌标准耐药菌株CA17要在第20代才恢复对氟康唑敏感。
     3.通过对原代耐药株、与香莲外洗液作用下转变为敏感株的白念珠菌菌株进行转录组测序,发现前者低表达后者高表达的的生物过程主要富集在与细胞氨基酸代谢过程,氨基分解过程,线粒体翻译,有机酸代谢,羧酸代谢,对氧化压力的反应,甘氨酸催化过程,丝氨酸家族氨基酸分解过程,氧化还原反应等过程;前者高表达后者低表达的生物过程主要富集在与细胞氨基酸代谢过程,氨基分解过程,羧酸代谢,有机酸代谢,蛋白质氨基酸糖基化,生物高聚物糖基化,糖基化,氮类复合物合成过程,糖蛋白合成以及代谢等过程。
     4.通过对自然转种敏感株、与香莲外洗液作用下转变为敏感株的白念珠菌菌株进行转录组测序,发现在自然转种菌株中低表达香莲外洗液作用菌株中高表达的差异基因的生物过程主要富集在与细胞内转运,核糖体定位,核糖体输出到核外,核糖蛋白复合物的生物合成,横跨膜运输,蛋白质运输,核糖体合成,氧化还原有关;在自然转种株中高表达与香莲外洗液作用菌株中低表达的差异基因的生物过程主要富集在羧酸代谢,有机酸代谢,细胞内氨基酸代谢,氨基代谢,胞内蛋白运输,甘氨酸代谢,蛋白定位。
     结论:
     1.临床研究发现,白念珠菌仍然是导致阴道念珠菌病的主要病原微生物,这与以往的研究是一致的;两性霉素B对菌群的敏感性最强,其次是伏立康唑、氟康唑、5-氟胞嘧啶、伊曲康唑,由于不同的念珠菌对药物敏感性差异较大,有些菌株对某些药物天然耐药,因此临床上外阴阴道念珠菌病的菌种分布和准确鉴定对抗真菌药物的选择具有重要价值;根据统计结果,尚不能认为白念珠菌和非白念珠菌导致的VVC患者的瘙痒及疼痛严重程度有差别。
     2.香莲外洗液能较快诱导耐药菌株恢复对氟康唑的敏感性。除此以外,香莲外洗液对各代转种的耐药菌株,MIC值与原代相同,表明香莲外洗液对耐药菌株作用相对稳定。
     3.基因研究方面,无论是与耐药原代株相比,还是同自然转种恢复敏感的菌株相比,香莲外洗液作用下的敏感株差异基因分析,都与目前发现公认的耐药基因不同,提示香莲外洗液对白念珠菌可能有其特异的作用靶点,值得进一步研究。
Object ive
     Candida albicans is a kind of most important opportunistic pathogens which can lead to infection of skin、mucosal、central nervous system. With development of society and modern medicine, kinds of technology and broad-spectrum antibiotics are applied into clinic which leads to elevation of incidence rate of mycotic infection. The application of antimycotic drug is widespread day after day. Beacuse of this situation, occurrence of drug resistance is more and more.
     VVC is a kind of common disease.Analyzing the distribution and resista nce of infected Candida albicans isolated from patients with vulvovaginal candidiasis(VVC)、analyzing the relationship of level of ache and prurit us and kind of strains、identifing reversal effect of xianglian solution to drug resisitence Candida albicans、discovery of effecting target of xia nglian solution to reverse drug resisitence Candida albicans, which mentio ned above is the subject focused on.
     Methods
     1.119clinical strains of leucorrhea sample from TCM hospital of Guang dong Province were detected by CHROM agar candida colored culture medium and API/ATB kits, to analyze the distribution and resistance of infected Candida albicans isolated from patients with vulvovaginal candidiasis(V VC); Dividing level of ache and pruritus and grading are for analyzing the relationship of level of pruritus and ache and kinds of Pathogenic bacte rium.
     2. Broth microdilution antifungal susceptibility test was used to dete ct MIC of drug-resistant Candida albicans Strains CA17induced by XiangLi an Lotion, to investigate generation of recovery sensitivity to Fluconazol e of drug-resistant Candida albicans Strains CA17.
     3. Modern molecular biology technology was used to reveal the molecular mechanism of Xianglian solution in the gene level to Candida albicans, including primary generation resistance strain and sensitive strains which induced by Xianglian solution, sensitive strains which come from subcultivation. Multi-target superelevation flux screening t—echnology was used to construct Xianglian solution gene function mechanism.
     Results
     1. In119clinical strains of leucorrhea sample, Candida albicans accounts for81.51%, Candida glabrata accounts for15.13%, Candida tropicalis accounts for1.68%, Candida parapsilosis accounts for1.68%. When it confers to susceptibility test, amphotericin was best.The result of analyzing the relationship of level of ache and pruritus and kinds of strain is no value in statistics.
     2. Drug-resistant Candida albicans Strains CA17regained sensitivity to fluconazole after6th passage culture induced by XiangLian Lotion, however, the passage culture of control group without XiangLian Lotion was20th.
     3. Compare primary generation resistance strain and sensitive strains which induced by Xianglian solution, the lower expression of gene of primary generation resistance strain concentrates in:The amino acid metabolism process and the aminolysis process, mitochondria translation, organic acid metabolism、carboxylic acid metabolism、glycine catalysis process、serine family amino acids decompose process、redoxreaction process.the lower expression of gene of sensitive strains whichinduced by Xianglian solution concentrates in the amino acid metabolism process and the aminolysis process、 carboxylic acid metabolism、organic acid metabolism、protein amino acids glycosylation、biopolymer glycosylation、nitrogen—compounds synthesis process、glycoprotein synthesis and metabolism process.
     4. Compare sensitive strains which come from subcultivation and sensitive strains which induced by Xianglian solution,the lower expression of gene of sensitive strains which come from subcultivation concentrates in: intracellular transport、ribosome allocation、ribosome、nucleoglucoprotein compound biology synthesis、transmembrane transport、protein trafficking、 ribosome synthesis、oxidoreduction;the lower expression of gene of sensitive strains which induced by Xianglian solution concentrates in:carboxylic acid metabolism、organic acid metabolism、intra-cellular amino acid metabolism、 amino-group metabolism、protein transportation transportation、glycine metabolism、proteinum localization.
     Conelusion
     1. Candida albicans was the most important pathogenic bacterium of vulvovaginal candidiasis(VVC). Other kinds of Candida mycoderma are more and more. Widespread usage of fluconazol is responsible for it. In clinic, we should pay more attention to susceptibility test and rational use of drug to elevate therapeutic efficacy. The result of analyzing the relationship of level of ache and pruritus and kinds of strain is no value in statistics. Compare to other Candida, Candida albicans can not aggratate the level of ache and pruritus.
     2. XiangLian Lotion can induce drug-resistant Candida albicans Strains From Vagina to regain sensitivity to Fluconazole quickly.
     3. In the process of searching different gene, we find that the different gene between primary generation resistance strain and sensitive strains which induced by Xianglian solution、 sensitive strains which induced by Xianglian solution and sensitive strains which come from subcultivation are different from gene which found already.the target gene which xianglian-soution effects on is different from those found already, which is worth later detailed research.
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