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目的 筛选与申克孢子丝菌酵母相与菌丝相双相转换相关的差异表达基因,为探讨其双相转换的分子的机制奠定基础.方法 应用抑制性消减杂交技术,构建高特异性的申克孢子丝菌菌丝相(mycelium,M)和酵母相(yeast,Y)的正反cDNA消减文库,并对其差异表达的基因进行生物信息学分析.结果 M+Y文库获得751条表达序列标签,平均长度为690.98 bp,经拼接后获得101条非冗余序列.Y+M文库获得875条表达序列标签,平均长度为575.9 bp,拼接获得249条非冗余序列.经BLASTN比对,这些差异表达基因中,某些结构基因和功能不明的细胞分子类基因可能与双相转换有关.结论 成功构建了高特异性的申克孢子丝菌菌丝相和酵母相的正反cDNA 消减文库,为进一步筛选申克孢子丝菌的双相转换基因奠定了基础. 相似文献
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特比萘芬治愈儿童鼻翼孢子丝菌病1例 总被引:3,自引:2,他引:1
目的报道1例发生在4岁儿童鼻翼的孢子丝菌病。方法刮取病变组织接种到沙堡弱培养基培养,并对培养出的病原菌进行形态学鉴定和ITS区序列分析。结果病变组织在沙堡弱培养基25℃培养长出黑褐色菌落,25℃小培养后光镜及扫描电镜下见菌丝细长,分枝分隔,合轴式产孢形成的成簇和沿菌丝两侧排列,分生孢子卵圆形。提取真菌总DNA用PCR方法扩增ITS序列,测序后登录GeneBank进行比对,该菌与申克孢子丝菌菌株KMU3360ITS区碱基序列一致性达99%,鉴定为申克孢子丝菌。内服联合局部应用特比萘芬治疗6个月后皮损完全消退。结论确诊1例儿童鼻翼的孢子丝菌病,内服联合局部应用特比萘芬治疗儿童孢子丝菌病疗效良好。 相似文献
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报道1例由球形孢子丝菌所致的婴儿固定型孢子丝菌病。患儿女,3个月,因左眼下内侧皮损2个月就诊,皮损脓液标本进行真菌培养,对培养获得菌株进行形态学、生理学和分子生物学鉴定,并进行药物敏感性检测。真菌培养阳性,镜下可见典型的套袖样菌丝。钙调蛋白基因序列分析鉴定为球形孢子丝菌。药敏试验显示特比萘芬和伊曲康唑对该菌株的菌丝相最低抑菌浓度(minimal inhibitorycon centration,MIC)分别为0.5μg/mL和0.5μg/mL;对该菌株的酵母相的MIC值分别为0.25μg/mL和0.5μg/mL。给予患者口服特比萘芬32.5mg/d治疗10周后皮损消退呈瘢痕化修复。依据临床及实验室检查确诊该病例为球形孢子丝菌所致固定型孢子丝菌病,特比萘芬治疗本病例显示较好疗效。 相似文献
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目的探讨山苍子油对申克孢子丝菌的体外抗菌活性及其作用机理。方法纸片扩散法定性检测山苍子油对申克孢子丝菌的体外抗菌活性,CLSI-M27-A微量液基稀释法定量检测其对14株临床分离申克孢子丝菌(包括固定型和淋巴管型各7株)的最小抑菌浓度(MIC),以氟康唑作为质控药物。电镜观察山苍子油作用前后申克孢子丝菌超微结构的改变。结果纸片扩散法1周后可见清晰的抑菌环,山苍子油对皮肤固定型株和皮肤淋巴管型株的MIC范围均为156.25~1250μg/ml,差异无显著性(P>0.05)。电镜观察显示山苍子油作用24h后申克孢子丝菌的菌丝干枯、断裂,孢子壁疏松、碎裂;胞膜及胞壁结构模糊,胞浆皱缩,细胞器及细胞核结构模糊。结论山苍子油对临床分离的皮肤型孢子丝菌有较强的抗菌活性,且其对固定型株和淋巴管型株的抗菌活性无显著性差异。电镜结果提示山苍子油可能通过破坏菌胞膜,影响其通透性,进而扰乱细胞正常代谢而起到抗菌作用。 相似文献
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目的将不同来源的申克孢子丝菌菌株接种于免疫抑制处理后的小鼠皮内及腹腔,造成其实验性感染,观察其感染情况,研究不同菌株及不同接种途径对小鼠孢子丝菌病的影响。方法分别在小鼠皮内和腹腔注射孢子丝菌菌悬液0.1ml,约含1×107个孢子,观察3周。观察结束时处死小鼠取其血、脑、肺、肝、脾、肾、肠系膜、睾丸、腹膜进行真菌培养和组织病理检查。结果皮内和腹腔接种不同来源菌株的小鼠各器官感染率各不相同。播散株皮内接种组、固定株腹腔接种组、播散株腹腔接种组的各器官平均感染率分别为16.05%、18.89%、58.73%。播散株腹腔接种组与其他二组之间差异均有显著性,脾和睾丸是最易受累的器官。结论不同来源菌株可能毒力不同,播散型菌株具有更强的侵袭性。脾脏可能在宿主抗孢子丝菌感染中具有重要作用。 相似文献
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Protein kinase C (PKC) plays an important role in the control of proliferation and differentiation of a wide range of cell
types, and fungi are no exception. Previous results reported by us on the effects of the phorbol ester, 12-myristate-13-acetate
phorbol (PMA) and other PKC effector molecules, on dimorphism in Sporothrix schenckii suggested the presence of this enzyme
in the fungus and its involvement in the control of morphogenetic transitions. The work summarized here confirms the presence
of PKC in yeast and mycelium extracts of S. schenckii. Different isoforms of this enzyme were found to be present in the yeast
and mycelium forms of the fungus and were identified by Western blot analysis using affinity purified anti-PKC isoforms specific
antibodies: the γ and ζ isoforms were detected in both the yeast and mycelium forms of the fungus, while the β isoform was
only detected in the yeast form. The presence of PKC was confirmed biochemically by measuring total enzyme activity in both
forms of the fungus. No significant differences were observed for the PKC activity level recorded for both the mycelium and
yeast forms of the fungus (p ≤ 0.05). These data confirm the presence of PKC activity in Sporothrix schenckii and constitutes
the first evidence concerning the differential expression of PKC isoforms in the mycelium and yeast forms of a dimorphic fungus,
supporting the possible involvement of this important signal transduction enzyme in the control of morphogenesis in this fungus.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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目的 对吉林省扶余县35例儿童孢子丝菌病进行临床分析并对部分菌株进行基因测定,了解该地区孢子丝菌病的致病菌菌株基因是否发生变异而致致病力增强及发病率增高.方法 收集2011年1月1日~4月30日来自扶余县就诊于我科并确诊为孢子丝菌病的患儿35例,进行临床分析;从中选取8株菌,对其核糖体保守区及内转录间隔区(ITS)、非转录间隔区(NTS)区进行基因测定,了解基因水平上的异同.结果 8株孢子丝菌菌株中5株NTS区可见较大范围的碱基缺失.结论 吉林省扶余县孢子丝菌菌株可能由于NTS区碱基较大范围缺失而致致病力增强,导致该地区短时间内发病率增高. 相似文献
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Isolation of ergosterol peroxide and its reversion to ergosterol in the pathogenic fungus Sporothrix schenckii 总被引:2,自引:0,他引:2
da Graça Sgarbi Diana Bridon da Silva Antonio Jorge Ribeiro Carlos Iracilda Zeppone Silva Célio Lopes Angluster Jayme Alviano Celuta Sales 《Mycopathologia》1997,139(1):9-14
Ergosterol peroxide, a presumed product of the H_2O_2-dependent enzymatic oxidation of ergosterol, has been isolated from yeast forms of the pathogenic fungus Sporothrix schenckii.
The substance, which may have a role in fungal virulence, has been characterized mainly using spectroscopic methods (1H and 13C nuclear magnetic resonance and high resolution mass spectra). The purified compound showed a molecular formula of C_28H_44O_3, displaying characteristic features of epidioxy sterols and was reverted to ergosterol when submitted to S. schenckii enzymatic
extract.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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de Meyer EM de Beer ZW Summerbell RC Moharram AM de Hoog GS Vismer HF Wingfield MJ 《Mycologia》2008,100(4):647-661
Sporothrix, one of the anamorph genera of Ophiostoma, includes the important human pathogen S. schenckii and various fungi associated with insects and sap stain of wood. A survey of fungi from wood utility poles in South Africa yielded two distinct groups of Sporothrix isolates from different geographical areas. DNA sequence and morphological data derived in this study showed that isolates in these groups represent two novel species in the S. schenckii-O. stenoceras species complex. A new species isolated from pine poles and rosebush wood and phylogenetically closely related to S. pallida is described here as Sporothrix stylites. Phylogenetic analyses also confirmed the synonymy of S. albicans and S. nivea with S. pallida. Sporothrix stylites and S. pallida also are related closely to the isolates from soil, previously treated as "environmental" isolates of S. schenckii. Soil isolates are clearly distinct from human isolates of S. schenckii. We describe the former here as Sporothrix humicola. The isolates from eucalypt poles group peripheral to most other species in the S. schenckii-O. stenoceras complex and are newly described as Sporothrix lignivora. Phylogenetic analyses of sequences of isolates from soil and wood together with those of clinical isolates showed that the human-pathogenic strains form an aggregate of several cryptic species. 相似文献
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Carlos Iracilda Zeppone Sgarbi Diana Bridon da graça Placeres Marisa Campos Polesi 《Mycopathologia》1998,144(1):9-14
A peptide-polysaccharide, a peptide-rhamnomannan, was isolated from the pathogenic yeast form of the fungus Sporothrix schenckii.
This substance, which may play a role in fungal virulence, was tested in an animal model of systemic disease, and depression
of the immune response was observed in the animals between the 4th and 6th week of infection. Concomitantly, this compound
showed mitogenic activity when challenged with normal lymphocytes and was also found to be involved in the inflammatory response.
These results provide further information for the understanding of fungal implantation in tissues and of the pathogenicity
of this systemic mycosis.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献