RESUMEN

BACKGROUND: Sigmoid colon adenocarcinoma has a high incidence among gastrointestinal tumors, and it very rarely metastasizes to the penis. The literature reports that the prognosis after penile metastasis is generally poor, with a median survival of about 9 mo. Metachronous isolated metastasis to the penis originating from sigmoid colon adenocarcinoma has not been reported so far. Here, we report a case of sigmoid colon adenocarcinoma with isolated penile metastasis occurring 2 years after surgery. The mass was pathologically confirmed as metastatic adenocarcinoma, and oral chemotherapy with capecitabine was given after surgery. The tumor did not recur during the 2-year follow-up period. CASE SUMMARY: A 79-year-old man presented to the urology department with "a mass located at the root of the penis since 1 mo". Enhanced computed tomography (CT) examination suggested a 12 mm × 10 mm × 9 mm nodule at the root of the right penile corpus cavernosum. Cranial, pulmonary, and abdominal CT; and bone scan did not show any tumorigenic lesions. The carcinoembryonic antigen (CEA) level was slightly elevated (6.01 ng/mL, reference value 0-5 ng/mL). The patient had undergone laparoscopic radical sigmoidectomy for sigmoid colon cancer 2 years ago. The postoperative pathology showed moderately differentiated adenocarcinoma of the sigmoid colon, and the stage was PT2N0M0. The penile mass was removed under general anesthesia. The postoperative pathology showed adenocarcinoma, and immunohistochemistry showed CDX2(+), CK20(+), and Villin(+). Based on the medical history, he was diagnosed with penile metastasis from sigmoid colon adenocarcinoma. The CEA level returned to normal (3.34 ng/mL) 4 d after surgery. Oral chemotherapy with capecitabine was given subsequently, and tumor recurrence was not found during the 2-year follow-up period. CONCLUSION: To our knowledge, this is a rare case of metachronous isolated penile metastasis from sigmoid colon adenocarcinoma. The penis is a potential site of metastasis of colon adenocarcinoma, and the possibility of metastasis should be considered in patients with a history of colon cancer who present with a penile mass. Solitary penile metastasis can be removed surgically, in combination with chemotherapy, and it may have good long-term outcomes.

RESUMEN

The root of Platycodon grandiflorus (Jacq.) A. DC. (P. grandiflorus), Platycodonis Radix, has been commonly applied to prevent and treat human diseases including bronchitis, asthma and excessive phlegm. Platycodin D (PD), one of the most important therapeutic components of P. grandiflorus, has been reported to possess protective effect against alcohol and carbon tetrachloride induced hepatotoxicity. In this study, we examined the protective efficacy of PD on acetaminophen (APAP)-induced liver injury and possible underlying mechanisms in C57BL/6J mice. Administration of PD prior to APAP intoxication significantly ameliorated the increase in serum transferases, interleukin 1ß (IL-1ß), IL-6, tumor necrosis factor alpha (TNF-α), and hepatic malondialdehyde (MDA) and the depletion of glutathione (GSH) in mice. PD pretreatment decreased the expression of heme oxygenase-1 (HO-1), cyclooxygenase-2 (COX-2) and nuclear factor kappa B (NF-κB) in presence of APAP. Moreover, PD treatment noticeably reduced APAP-induced hepatocyte necrosis and apoptosis evidenced by evaluating physiological and histological hepatocyte changes in mice. Finally, PD pretreatment significantly diminished c-Jun NH2-terminal kinase (JNK), extracellular signal-regulated kinases 1 and 2 (ERK1/2), and p38 phosphorylation induced by APAP. Collectively, PD pretreatment effectively protects hepatocytes against APAP-induced hepatotoxicity in mice through ameliorating oxidative stress, inflammatory response, and hepatocyte apoptosis.

Asunto(s)

Acetaminofén/toxicidad , Enfermedad Hepática Inducida por Sustancias y Drogas/prevención & control , Hepatocitos/efectos de los fármacos , Saponinas/farmacología , Triterpenos/farmacología , Analgésicos no Narcóticos/toxicidad , Animales , Apoptosis/efectos de los fármacos , Enfermedad Hepática Inducida por Sustancias y Drogas/etiología , Glutatión/metabolismo , Hepatocitos/patología , Inflamación/inducido químicamente , Inflamación/prevención & control , Hígado/efectos de los fármacos , Hígado/patología , Sistema de Señalización de MAP Quinasas/efectos de los fármacos , Masculino , Malondialdehído/metabolismo , Ratones , Ratones Endogámicos C57BL , Estrés Oxidativo/efectos de los fármacos , Platycodon/química , Sustancias Protectoras/aislamiento & purificación , Sustancias Protectoras/farmacología , Saponinas/aislamiento & purificación , Triterpenos/aislamiento & purificación

RESUMEN

Acute liver injury (ALI) induced by acetaminophen (APAP) overdose is the most common cause of drug-induced liver injury. Saponins from Platycodon grandiflorum (PGSs) ameliorate alcohol-induced hepatotoxicity and enhance human lung carcinoma cell death via AMPK signaling pathway. However, whether PGS could protect from APAP-induced ALI through AMPK activation and its downstream signals is still poorly elucidated. This work investigated the protective effect and the underlying mechanisms of PGS against APAP-induced liver toxicity in mouse. PGS was administered at 15 or 30 mg/kg i.g./day for 1 week before a single injection of APAP (250 mg/kg, i.p.) 1 hr after last treatment of PGS. Serum alanine/aspartate aminotransferases, liver tumor necrosis factor-α and interleukin-1ß levels, liver malondialdehyde formation, liver glutathione depletion, cytochrome P450 E1, and 4-hydroxynonenal levels were measured to demonstrate the protective efficacy of PGS against APAP-induced ALI. Liver histological observation provided further evidence on PGS's protective effects. PGS treatment altered the phosphorylation of AMPK and PI3K/Akt, as well as the downstream signals including Bcl-2 family, caspase, and NF-κB in a dose-dependent manner. In conclusion, we demonstrate that PGS exhibits a significant liver protection against APAP-induced ALI, mainly through NF-κB and AMPK/PI3K/Akt signaling pathways.

Asunto(s)

Acetaminofén/toxicidad , Enfermedad Hepática Inducida por Sustancias y Drogas/tratamiento farmacológico , Platycodon/química , Saponinas/farmacología , Transducción de Señal/efectos de los fármacos , Proteínas Quinasas Activadas por AMP/metabolismo , Aldehídos/metabolismo , Animales , Aspartato Aminotransferasas/sangre , Sistema Enzimático del Citocromo P-450/metabolismo , Glutatión/metabolismo , Interleucina-1beta/metabolismo , Hígado/efectos de los fármacos , Masculino , Malondialdehído/metabolismo , Ratones , Ratones Endogámicos ICR , FN-kappa B/metabolismo , Estrés Oxidativo/efectos de los fármacos , Fosfatidilinositol 3-Quinasas/metabolismo , Fosforilación , Raíces de Plantas/química , Proteínas Proto-Oncogénicas c-akt/metabolismo , Factor de Necrosis Tumoral alfa/metabolismo

RESUMEN

In this study, we analyzed the physical interactions of the dominant negative isoform of MoYpt7. Our results show that MoYpt7 interacts with MoGdi1. The dominant negative isoform of MoYpt7 (dominant negative isoform, N125I) is essential for colony morphology, conidiation, and pathogenicity in the rice blast fungus. These results further demonstrate the biological functions of MoYpt7 in Magnaporthe oryzae.

Asunto(s)

Análisis Mutacional de ADN , Proteínas Fúngicas/metabolismo , Regulación Fúngica de la Expresión Génica , Genes Fúngicos , Proteínas Fluorescentes Verdes/metabolismo , Magnaporthe/genética , Microscopía Fluorescente , Mutación , Oryza/microbiología , Fenotipo , Enfermedades de las Plantas/microbiología , Isoformas de Proteínas

RESUMEN

Members of the metallothionein (MT) family are involved in metal detoxifcation and in the protection of cells against certain electrophilic carcinogens. In present study, it was found that MT1M was downregulated in more than 77.1% (91/118) of hepatocellular carcinoma (HCC) tissues compared with adjacent non-tumor tissues. Furthermore, overexpression of MT1M inhibited cell viability, colony formation, cell migration and invasion in HCC cell lines and tumor cell growth in xenograft nude mice, and activated cell apoptosis in HCC cell lines. In addition, immunohistochemistry analysis showed MT1M was negative or weak staining in tumor tissues but moderate or strong staining in adjacent non-tumor tissues. The sensitivity and specificity of MT1M for HCC diagnosis were 76.27% and 89.83%, respectively. In conclusion, MT1M was identified as a potential tumor marker for HCC and may serve as a useful therapeutic agent for HCC gene therapy.

Asunto(s)

Carcinoma Hepatocelular/metabolismo , Regulación hacia Abajo , Neoplasias Hepáticas/metabolismo , Metalotioneína/metabolismo , Anciano , Animales , Biomarcadores de Tumor/metabolismo , Línea Celular Tumoral , Movimiento Celular , Proliferación Celular , Supervivencia Celular , Femenino , Regulación Neoplásica de la Expresión Génica , Células Hep G2 , Humanos , Masculino , Ratones , Ratones Desnudos , Persona de Mediana Edad , Trasplante de Neoplasias

Asunto(s)

Dorso , Melanoma/secundario , Neoplasias Cutáneas/patología , Neoplasias de la Tiroides/secundario , Anciano , Carcinoma Medular/metabolismo , Carcinoma Medular/patología , Diagnóstico Diferencial , Femenino , Humanos , Melanoma/metabolismo , Melanoma/patología , Melanoma/cirugía , Antígenos Específicos del Melanoma/metabolismo , Proteínas S100/metabolismo , Neoplasias Cutáneas/metabolismo , Neoplasias Cutáneas/cirugía , Neoplasias de la Tiroides/metabolismo , Neoplasias de la Tiroides/patología , Neoplasias de la Tiroides/cirugía

RESUMEN

Fallen leaves of Ficus altissima, F. virens, F. benjamina, F. fistulosa and F. semicordata, were collected in Chiang Mai Province in northern Thailand and examined for fungi. Eighty taxa were identified, comprising 56 anamorphic taxa, 23 ascomycetes and 1 basidiomycete. Common fungal species occurring on five host species with high frequency of occurrence were Beltraniella nilgirica, Lasiodiplodia theobromae, Ophioceras leptosporum, Periconia byssoides and Septonema harknessi. Colletotrichum and Stachybotrys were also common genera. The leaves of different Ficus species supported diverse fungal taxa, and the fungal assemblages on the different hosts showed varying overlap. The fungal diversity of saprobes at the host species level is discussed.

Asunto(s)

Ascomicetos , Basidiomycota , Ecosistema , Ficus , Microbiología , Hongos , Clasificación , Hongos Mitospóricos , Hojas de la Planta , Microbiología , Especificidad de la Especie , Tailandia

RESUMEN

Appressorium formation is an important event in establishing a successful interaction between the rice blast fungus, Magnaporthe oryzae, and its host plant, rice. An understanding of molecular events occurring in appressorium differentiation will give new strategies to control rice blast. A quick and reliable method to extract total RNA from appressorium is essential for studying gene expression during appressorium formation and its mechanism. We found that duplicate film is an efficient substratum for appressorium formation, even when inoculated with high density conidia. When inoculated with conidia at 1x10(6) ml(-1), the percentages of conidium germination and appressorium formation were (97.98+/-0.67)% and (97.88+/-0.45)%, respectively. We applied Trizol before appressorium collection for total RNA isolation, and as much as 113.6 microg total RNA was isolated from the mature appressoria at 24 h after inoculation. Functional analysis of two genes, MNH6 and MgATG1, isolated from the cDNA subtractive library, revealed that the quantity of RNA was good enough to construct a cDNA (complementary DNA) library or a cDNA subtractive library. This method may be also applicable for the appressorium RNA isolation of other pathogenic fungi in which conidia differentiate into appressoria in the early stages of host infection.

Asunto(s)

ADN Complementario , Genética , ADN de Hongos , Genética , Biblioteca de Genes , Genes Fúngicos , Magnaporthe , Genética , Virulencia , Oryza , Microbiología , Enfermedades de las Plantas , Microbiología , ARN de Hongos , Genética

RESUMEN

The peroxisomal matrix proteins involved in many important biological metabolism pathways in eukaryotic cells are encoded by nucleal genes, synthesized in the cytoplasm and then transported into the organelles. Targeting and import of these proteins depend on their two peroxisomal targeting signals (PTS1 and PTS2) in sequence as we have known so far. The vectors of the fluorescent fusions with PTS, i.e., green fluorescence protein (GFP)-PTS1, GFP-PTS2 and red fluorescence protein (RFP)-PTS1, were constructed and introduced into Magnaporthe oryzae Guy11 cells. Transformants containing these fusions emitted fluorescence in a punctate pattern, and the locations of the red and green fluorescence overlapped exactly in RFP-PTS1 and GFP-PTS2 co-transformed strains. These data indicated that both PTS1 and PTS2 fusions were imported into peroxisomes. A probable higher efficiency of PTS1 machinery was revealed by comparing the fluorescence backgrounds in GFP-PTS1 and GFP-PTS2 transformants. By introducing both RFP-PTS1 and GFP-PTS2 into Deltamgpex6 mutants, the involvement of MGPEX6 gene in both PTS1 and PTS2 pathways was proved. In addition, using these transformants, the inducement of peroxisomes and the dynamic of peroxisomal number during the pre-penetration processes were investigated as well. In summary, by the localization and co-localization of PTS1 and PTS2, we provided a useful tool to evaluate the biological roles of the peroxisomes and the related genes.

Asunto(s)

Secuencia de Bases , Cartilla de ADN , Genética , ADN de Hongos , Genética , Proteínas Fúngicas , Genética , Metabolismo , Genes Fúngicos , Vectores Genéticos , Proteínas Fluorescentes Verdes , Genética , Metabolismo , Proteínas Luminiscentes , Genética , Metabolismo , Magnaporthe , Genética , Metabolismo , Microscopía Fluorescente , Mutación , Receptor de la Señal 2 de Direccionamiento al Peroxisoma , Receptor de la Señal 1 de Direccionamiento al Peroxisoma , Peroxisomas , Metabolismo , Receptores Citoplasmáticos y Nucleares , Genética , Metabolismo , Proteínas Recombinantes de Fusión , Genética , Metabolismo , Transformación Genética

RESUMEN

Sporidesmiopsis zhejiangensis sp. nov. and Spadicoides americana were found on submerged wood from streams in Zhejiang Province, China. Sporidesmiopsis zhejiangensis is characterized by obclavate to fusiform, 5-6-distoseptate, versicolorous, verruculose conidia with an apical mucilaginous sheath. Spadicoides americana is a new record to China. These taxa are described and illustrated, and morphological differences between these species and their similar species were summarized.

Asunto(s)

Ascomicetos , Clasificación , China , Agua Dulce , Microbiología , Hongos Mitospóricos , Clasificación , Especificidad de la Especie , Madera , Microbiología

RESUMEN

Magnaporthe oryzae has been used as a primary model organism for investigating fungus-plant interaction. Many researches focused on molecular mechanisms of appressorium formation to restrain this fungal pathogen. Autophagy is a very high conserved process in eukaryotic cells. Recently, autophagy has been considered as a key process in development and differentiation in M. oryzae. In this report, we present and discuss the current state of our knowledge on gene expression in appressorium formation and the progress in autophagy of rice blast fungi.

Asunto(s)

Autofagia , Genética , Expresión Génica , Genes Fúngicos , Interacciones Huésped-Patógeno , Magnaporthe , Genética , Virulencia , Fisiología , Oryza , Microbiología , Enfermedades de las Plantas , Microbiología

RESUMEN

Chinese soft-shelled turtles (Trionyx sinens) in culture farms using an artificial warming system in Zhejiang, China, often show typical signs of white-spot disease such as white spots on their bodies, skin lesions, anorexia and eventually death. The sick turtles were mostly 5~80 g in weight. A suspected fungal pathogen was isolated from the sick turtles and verified as Paecilomyces lilacinus by sequence analysis of the internal transcribed spacer (ITS) of its ribosomal DNA (rDNA). Detailed morphological examinations were also conducted to confirm the white-spot disease.

Asunto(s)

Animales , Paecilomyces , Tortugas , Microbiología

RESUMEN

In this study the MTP1 gene, encoding a type III integral transmembrane protein, was isolated from the rice blast fungus Magnaporthe oryzae. The Mtp1 protein is 520 amino acids long and is comparable to the Ytp1 protein of Saccharomyces cerevisiae with 46% sequence similarity. Prediction programs and MTP1-GFP (green fluorescent protein) fusion expression results indicate that Mtp1 is a protein located at several membranes in the cytoplasm. The functions of the MTP1 gene in the growth and development of the fungus were studied using an MTP1 gene knockout mutant. The MTP1 gene was primarily expressed at the hyphal and conidial stages and is necessary for conidiation and conidial germination, but is not required for pathogenicity. The Deltamtp1 mutant grew more efficiently than the wild type strain on non-fermentable carbon sources, implying that the MTP1 gene has a unique role in respiratory growth and carbon source use.

Asunto(s)

Proteínas Fúngicas , Genética , Fisiología , Genes Fúngicos , Magnaporthe , Genética , Proteínas de la Membrana , Genética , Oryza , Microbiología , Regiones Promotoras Genéticas

RESUMEN

The promoter of NAR gene in Magnaporthe grisea was isolated and sequenced. The promoter sequences contained the "TATA" box, the "CAAT" box, and binding sites for fungal regulatory proteins. Programs that predict promoter sequences indicated that promoter sequence lies between locations 430 and 857 of the NAR promoter fragment. GFP expression under the NAR promoter and NAR transcript analysis revealed that this promoter is activated primarily at the mycelial stage in the rice blast fungus and could be used to express native or extrinsic genes in the mycelia of the rice blast fungus.

Asunto(s)

Secuencia de Bases , Clonación Molecular , Proteínas Fúngicas , Genética , Expresión Génica , Genética , Hifa , Genética , Magnaporthe , Genética , Datos de Secuencia Molecular , Regiones Promotoras Genéticas , Genética , Activación Transcripcional , Genética

RESUMEN

Application of promoter trapping based on transformation in Magnaporthe grisea is reported in this paper. Two promoter-trapping vectors, designated as pCBGFP and pEGFPHPH, were constructed and transformed into protoplasts of M. grisea. A library of 1,077 transformants resistant to hygromycin B was generated. Of which, 448 transformants were found to express eGFP gene in different structures of M. grisea. Three transformants grew slowly, 5 transformants decreased in conidiation and 7 transformants reduced in pathogenicity greatly among these 448 transformants. Eleven transformants were checked by genomic southern blot randomly, and 9 of which were single-copy insertions. The promoter trapping technique has been applied successfully in M. grisea and can be used as a tool for functional genomic analysis.

Asunto(s)

Proteínas Fúngicas , Genética , Regulación Fúngica de la Expresión Génica , Genética , Genes Reporteros , Genética , Vectores Genéticos , Genética , Proteínas Fluorescentes Verdes , Genética , Metabolismo , Magnaporthe , Genética , Metabolismo , Regiones Promotoras Genéticas , Genética , Ingeniería de Proteínas , Métodos , Proteínas Recombinantes , Metabolismo

RESUMEN

MGTA1, a putative fungal Zn(II)(2)Cys(6) transcriptional activator-encoding gene, was isolated from rice blast pathogen Magnaporthe grisea, which is homologous to CLTA1 from Colletotrichum lindemuthianum with 51% identity at protein level. MGTA1 cassette contains a 2370 bp open reading frame, consisting of 6 exons, coding a 790 amino acid peptide. MGTA1 gene exists as a single copy in genomes of 7 strains of M. grisea, and is expressed in tip hyphae, conidia, and mature appressoria of strain Guy11.

Asunto(s)

Secuencia de Aminoácidos , Perfilación de la Expresión Génica , Regulación Fúngica de la Expresión Génica , Fisiología , Magnaporthe , Genética , Metabolismo , Datos de Secuencia Molecular , Oryza , Microbiología , Análisis de Secuencia de Proteína

RESUMEN

A mature appressorium cDNA library of rice blast fungus, Magnaporthe grisea, was constructed in a lambdaTriplEx2 vector by SMART cDNA library containing 2.37x10(6) independent clones about 100% of which harbor foreign cDNA inserts with average size of 660 bp. Of 9 randomly selected clones, 2 expressed sequence tags (ESTs) sequences did not have homologous EST sequences of M. grisea in GenBank. The appressorium cDNA library is suitable for gene expression analysis and function analysis of the late stages of appressorium formation and the early stages of penetration of M. grisea.

Asunto(s)

Clonación Molecular , Métodos , ADN de Hongos , Genética , Perfilación de la Expresión Génica , Métodos , Regulación Fúngica de la Expresión Génica , Biblioteca de Genes , Magnaporthe , Genética , Análisis de Secuencia de ADN , Métodos