RESUMEN
Fragmented data are available on the human polyomaviruses (HPyVs) prevalence in the gastrointestinal tract. Rearrangements in the non-coding control region (NCCR) of JCPyV and BKPyV have been extensively studied and correlated to clinical outcome; instead, little information is available for KIPyV, WUPyV and MCPyV NCCRs. To get insights into the role of HPyVs in the gastrointestinal tract, we investigated JCPyV, BKPyV, KIPyV, WUPyV and MCPyV distribution among hematological patients in concomitance with gastrointestinal symptoms. In addition, NCCRs and VP1 sequences were examined to characterize the strains circulating among the enrolled patients. DNA was extracted from 62 stool samples and qPCR was carried out to detect and quantify JCPyV, BKPyV, KIPyV, WUPyV and MCPyV genomes. Positive samples were subsequently amplified and sequenced for NCCR and VP1 regions. A phylogenetic tree was constructed aligning the obtained VP1 sequences to a set of reference sequences. qPCR revealed low viral loads for all HPyVs searched. Mono and co-infections were detected. A significant correlation was found between gastrointestinal complications and KIPyV infection. Archetype-like NCCRs were found for JCPyV and BKPyV, and a high degree of NCCRs stability was observed for KIPyV, WUPyV and MCPyV. Analysis of the VP1 sequences revealed a 99% identity with the VP1 reference sequences. The study adds important information on HPyVs prevalence and persistence in the gastrointestinal tract. Gastrointestinal signs were correlated with the presence of KIPyV, although definitive conclusions cannot be drawn. HPyVs NCCRs showed a high degree of sequence stability, suggesting that sequence rearrangements are rare in this anatomical site.
Asunto(s)
Heces/virología , Variación Genética , Neoplasias Hematológicas/complicaciones , Infecciones por Polyomavirus/epidemiología , Infecciones por Polyomavirus/virología , Poliomavirus/aislamiento & purificación , Esparcimiento de Virus , Adulto , Niño , Femenino , Humanos , Masculino , Filogenia , Poliomavirus/clasificación , Poliomavirus/genética , Prevalencia , Reacción en Cadena en Tiempo Real de la Polimerasa , Carga ViralRESUMEN
OBJECTIVE: To evaluate the performance of the culture colorimetric detection assay MYCO WELL D-ONE® (MWD-ONE), designed to detect sexually transmitted infections using real-time polymerase chain reaction (PCR) as a reference method. MATERIALS AND METHODS: One hundred and ten urogenital samples were screened for Gardnerella vaginalis (GV), Trichomonas vaginalis (TV), Mycoplasma hominis (MH), Mycoplasma spp., and Ureaplasma urealyticum (UU)/Ureaplasma parvum (UP) using the MWD-ONE and real-time PCR assays Gardnerella vaginalis/Lactobacillus species Real-TM Quant and Anyplex II STI-7 Detection, respectively. RESULTS: GV was detected in 33 samples by both the MWD-ONE and real-time PCR, while 6 samples gave discordant results. TV was detected by both MWD-ONE and Anyplex II STI-7 Detection kits in 3 samples, while 107 were negative. MH was detected by both methods in 5 cases, 4 samples gave discordant results, and 101 were negative. Mycoplasma genitalium (MG) was detected by Anyplex II STI-7 in 2 cases, 1 of which was detected as Mycoplasma spp. by MWD-ONE. Ten samples were positive by MWD-ONE, and 98 were negative with both assays. With regard to UU/UP, 24 cases were detected by MWD-ONE and Anyplex PCR, 25 by PCR only, 4 by MWD-ONE, and 57 tested negative with both methods.The positive predictive values (PPV) and negative predictive values (NPV) of the MWD-ONE assay for the pathogens tested were as following: GV, PPV 94.3%, NPV 94.7%; TV, PPV and NPV 100%; MH, PPV 71.4%, NPV 98.1%; Mycoplasma spp., PPV 9.1%, NPV 98.9%; and Ureaplasma spp., PPV 85.7 %, NPV 69.5 %. The agreement between the MWD-ONE and PCR was strong for GV and MH (k=0.8 and 0.7, respectively); perfect for TV (k=1); and moderate for UU/UP (k=0.4). CONCLUSION: MWD-ONE assay appears to be suitable for routine testing of sexually transmitted infections.
RESUMEN
Rapid pathogen identification (ID) and antimicrobial susceptibility testing (AST) in bacteremia cases or sepsis could improve patient prognosis. Thus, it is important to provide timely reports, which make it possible for clinicians to set up appropriate antibiotic therapy during the early stages of bloodstream infection (BSI). This study evaluates an in-house microbiological protocol for early ID as well as AST on Gram negative bacteria directly from positive monomicrobial and polymicrobial blood cultures (BCs). A total of 102 non-duplicated positive BCs from patients with Gram-negative bacteremia were tested. Both IDs and ASTs were performed from bacterial pellets extracted directly from BCs using our protocol, which was applied through the combined use of a MALDI-TOF MS and Vitek2 automated system. The results of our study showed a 100% agreement in bacterial ID and 98.25% categorical agreement in AST when compared to those obtained by routine conventional methods. We recorded only a 0.76% minor error (mE), 0.76% major error (ME) and a 0.20% very major error (VME). Moreover, the turnaround time (TAT) regarding the final AST report was significantly shortened (ΔTATâ¯=â¯8-20â¯h, pâ¯<â¯0.00001). This in-house protocol is rapid, easy to perform and cost effective and could be successfully introduced into any clinical microbiology laboratory. A final same-day report of ID and AST improves patient management, by early and appropriate antimicrobial treatment and could potentially optimize antimicrobial stewardship programs.
Asunto(s)
Bacteriemia/microbiología , Técnicas Bacteriológicas/métodos , Cultivo de Sangre/métodos , Análisis Costo-Beneficio , Bacterias Gramnegativas/aislamiento & purificación , Pruebas de Sensibilidad Microbiana/métodos , Antibacterianos/farmacología , Técnicas de Tipificación Bacteriana/instrumentación , Técnicas de Tipificación Bacteriana/métodos , Técnicas Bacteriológicas/instrumentación , Pruebas Diagnósticas de Rutina/métodos , Bacterias Gramnegativas/efectos de los fármacos , Bacterias Gramnegativas/patogenicidad , Humanos , Pruebas de Sensibilidad Microbiana/instrumentación , Sepsis/microbiología , Espectrometría de Masa por Láser de Matriz Asistida de Ionización Desorción/instrumentación , Espectrometría de Masa por Láser de Matriz Asistida de Ionización Desorción/métodos , Factores de TiempoRESUMEN
BACKGROUND: Carbapenemase-producing Enterobacteriaceae (CPE), particularly carbapenemase-producing Klebsiella pneumoniae isolates, are important causative agents of nosocomial infections associated with significant mortality rates mostly in critical wards. The rapid detection and typing of these strains is critical either for surveillance purposes and to prevent outbreaks and optimize antibiotic therapy. In this study, the MALDI-TOF MS method was used to detect rapidly these isolates from blood cultures (BCs) and to obtain proteomic profiles enable to discriminate between carbapenemase-producing and non-carbapenemase-producing strains. RESULTS: Fifty-five K. pneumoniae strains were tested. Identification and carbapenemase-production detection assay using Ertapenem were performed both from bacterial pellets extracted directly from BCs flasks and from subcultures of these strains. For all isolates, a complete antimicrobial susceptibility testing and a genotypic characterization were performed. We found 100% agreement between the carbapenemase-producing profile generated by MALDI TOF MS and that obtained using conventional methods. The assay detected and discriminated different carbapenemase-producing K. pneumoniae isolates within 30 min to 3 h after incubation with Ertapenem. CONCLUSIONS: MALDI-TOF MS is a promising, rapid and economical method for the detection of carbapenemase-producing K. pneumoniae strains that could be successfully introduced into the routine diagnostic workflow of clinical microbiology laboratories.
Asunto(s)
Proteínas Bacterianas/aislamiento & purificación , Técnicas de Tipificación Bacteriana/métodos , Cultivo de Sangre/métodos , Klebsiella pneumoniae/enzimología , Espectrometría de Masa por Láser de Matriz Asistida de Ionización Desorción/métodos , beta-Lactamasas/aislamiento & purificación , Proteínas Bacterianas/análisis , Técnicas de Cultivo de Célula , Infección Hospitalaria , Enterobacteriaceae/enzimología , Enterobacteriaceae/aislamiento & purificación , Ertapenem , Humanos , Italia , Infecciones por Klebsiella/diagnóstico , Klebsiella pneumoniae/efectos de los fármacos , Klebsiella pneumoniae/aislamiento & purificación , Laboratorios , Proteómica , Espectrometría de Masa por Láser de Matriz Asistida de Ionización Desorción/economía , Factores de Tiempo , beta-Lactamasas/análisis , beta-Lactamas/farmacologíaRESUMEN
Several pathogens can be transmitted sexually and are an important cause of morbidity among sexually active women. The aim of the study was to detect the presence of human papillomavirus (HPV), Chlamydia trachomatis (CT), Neisseria gonorrhoeae (NG), Trichomonas vaginalis (TV), Mycoplasma hominis (MH), Mycoplasma genitalium (MG), Ureaplasma urealyticum (UU), and Ureaplasma parvum (UP) in a group of 309 healthy women enrolled at the San Camillo - Forlanini hospital of Rome by using two multiplex real-time PCR assays based on TOCE® technology. The women's ages ranged from 34 to 60 years, median 49 [IQR 45-54]. Of the 309 women tested, HPV DNA was detected in 77/309 (24.9%) patients. Of these, 44 (14.2%) harboured a single infection while 33 (10.7%) were infected by multiple genotypes. Prevalence of HPV infection was highest among females aged 40-50 years (15.2%). Of the other pathogens sought, CT, MG and NG were not detected while positive results were found for MH (12/309, 3.9%), TV (4/309, 1.3%), UP (89/309, 28.8%) and UU (14/309, 4.5%). Co-infections were as follows: 5 MH/HPV, 4 TV/HPV, 34 UP/HPV and 9 UU/HPV. In HPV-positive women, the probability of being infected by UP and UU was 2.5 (p=0.00045) and 6 fold higher (p=0.0016) than in HPV-negative women. The study supports the use of multiplex real-time PCR assays in a routine diagnostic setting. The high sensitivity and specificity of these assays along with the simultaneous detection of the most common sexually transmitted pathogens confers an advantage with respect to more obsolete methods reducing costs and time to diagnosis.
Asunto(s)
Voluntarios Sanos/estadística & datos numéricos , Reacción en Cadena de la Polimerasa Multiplex/métodos , Infecciones por Papillomavirus/epidemiología , Enfermedades de Transmisión Sexual/epidemiología , Adulto , Neoplasias de la Mama/diagnóstico , Neoplasias de la Mama/epidemiología , Femenino , Humanos , Italia/epidemiología , Tamizaje Masivo , Persona de Mediana Edad , Infecciones por Mycoplasma/epidemiología , Valor Predictivo de las Pruebas , Prevalencia , Sensibilidad y Especificidad , Enfermedades de Transmisión Sexual/diagnóstico , Enfermedades de Transmisión Sexual/microbiología , Infecciones por Ureaplasma/epidemiologíaRESUMEN
INTRODUCTION: Thymosin α1 (Tα1) is a naturally occurring polypeptide that regulates immune cell development and function, and is also capable of interacting with multiple target cells with relevant biological effects. The rationale of Tα1 use in cancer treatment stems from the consideration that tumor progression is favored by a failure of the immune response and in turn induces immune suppression. This paper will review the historical background of Tα1 use in oncology, aiming to highlight the importance of Tα1 as an immunotherapeutic tool to be used in combination with chemotherapy, a concept that is not yet fully established in clinic. AREAS COVERED: The efficacy and safety of combining Tα1 with chemotherapy and cytokines were first evaluated in murine tumor models, providing essential information about effects, mechanisms of action, doses and treatment protocols. The therapeutic potential of the chemo-immunotherapy protocol on metastatic melanoma and lung cancer has been confirmed in controlled clinical trials. Critical for the efficacy of the chemo-immunotherapy protocol is the dual action of Tα1 on immune effector and tumor cells. EXPERT OPINION: On the basis of the preclinical and clinical results available, the use of the chemo-immunotherapy protocol, in which the role of Tα1 is central, is strongly recommended.
Asunto(s)
Antineoplásicos/uso terapéutico , Timosina/análogos & derivados , Animales , Ensayos Clínicos como Asunto/métodos , Citocinas/inmunología , Citocinas/uso terapéutico , Evaluación Preclínica de Medicamentos/métodos , Humanos , Inmunoterapia/métodos , Neoplasias Pulmonares/tratamiento farmacológico , Neoplasias Pulmonares/inmunología , Melanoma/tratamiento farmacológico , Melanoma/inmunología , Timalfasina , Timosina/uso terapéuticoRESUMEN
BACKGROUND: Distal and lateral onychomycoses are the most frequent forms of onychomycosis, causing subungual hyperkeratosis that usually limits local penetration of antimycotic drugs. Tazarotene exerts anti-inflammatory and immune-modulating activities toward both infective agents and damaged keratinocytes. Given the well-documented efficacy of tazarotene on hyperkeratotic nail psoriasis, we investigated its therapeutic use in onychomycosis. PATIENTS AND METHODS: We designed a preliminary open clinical trial in patients affected by distal and lateral subungual onychomycosis of the toenails and verified the fungistatic activity of tazarotene in vitro. Fifteen patients were treated with topical tazarotene 0.1% gel once per day for 12 weeks. Mycological cultures and potassium hydroxide stains of nail samples were performed at the beginning and at the end of the study. Treatment was considered effective when clinical healing and negative mycological culture were obtained. Onycholysis, nail bed discoloration, and subungual hyperkeratosis were measured using standardized methodologies and analyzed by means of Mann-Whitney test and analysis of variance. Fungistatic activity of tazarotene was evaluated by disk diffusion assay. RESULTS: Six patients (40%) reached a mycological cure on target nail samples already after 4 weeks of treatment. Complete clinical healing and negative cultures were reached in all patients at week 12, with a significant improvement of all clinical parameters of the infected nails. Disk diffusion assay after 48 hours of incubation with tazarotene solution showed a central area of inhibition in all examined fungal cultures. CONCLUSION: Our results documented a good clinical outcome using topical tazarotene 0.1% gel in distal and lateral subungual onychomycosis and its fungistatic activity of tazarotene in vitro. The majority of patients appeared cured at a 6-month follow-up. The efficacy and safety of tazarotene must be confirmed on a larger number of patients, although already documented in nail psoriasis patients often affected by onychomycosis.
Asunto(s)
Ácidos Nicotínicos/administración & dosificación , Ácidos Nicotínicos/uso terapéutico , Onicomicosis/tratamiento farmacológico , Administración Tópica , Adolescente , Adulto , Anciano , Femenino , Humanos , Masculino , Persona de Mediana Edad , Adulto JovenRESUMEN
OBJECTIVE: To study the role of cervicovaginal infections in women with cytological reports of atypical squamous cells of undetermined significance (ASC-US). MATERIALS AND METHODS: The study included 220 women admitted to the Clinic of Microscopy, Cervicovaginal and Vulvar Pathology of the Department of Gynecology and Obstetrics of the Tor Vergata University Hospital, Rome, Italy, enrolled between October 2012 and July 2013. RESULTS: Among the enrolled women, 105 women (47.7%) had ASC-US cytology, whereas 115 women (52.3%) had negative cytology. Microscopy showed infections more frequently in women with ASC-US than in those with negative cytology: 70.5% (74/105) vs 36% (41/115); p < .001. Cocci were present in 73.3% (77/105) of the women with ASC-US and in 43.5% (50/115) of those with negative cytology; p < .001. According to Ison score, 84% (88/105) of ASC-US was grade 0 vs 22% (25/115) of negative cytology, p < .001. Human papillomavirus was detected in 35% of the women with ASC-US. A statistically significant correlation between high pH and vaginal infections was found in women aged 20 to 29 (p = .003) and those 50 years or older in both cytological report groups; p < .001. CONCLUSIONS: Cervicovaginal infections are associated with a cytological report of ASC-US. Direct microscopy of vaginal specimens allowing immediate evaluation of the vaginal microflora and infectious agents may be a useful tool in managing women with cytological reports of ASC-US.
Asunto(s)
Células Escamosas Atípicas del Cuello del Útero/microbiología , Enfermedades del Cuello del Útero/microbiología , Enfermedades del Cuello del Útero/patología , Enfermedades Vaginales/microbiología , Adolescente , Adulto , Anciano , Cuello del Útero/microbiología , Femenino , Humanos , Italia/epidemiología , Persona de Mediana Edad , Papillomaviridae/aislamiento & purificación , Infecciones por Papillomavirus/epidemiología , Enfermedades del Cuello del Útero/epidemiología , Vagina/microbiología , Enfermedades Vaginales/epidemiología , Enfermedades Vaginales/patología , Adulto JovenRESUMEN
Urinary tract infection is a common disease diagnosed from symptoms and clinical signs, and bacterial count per volume of urine. This study have evaluated the BiesseBioscreen analyzer as a new way to analyze urine samples en- abling fast screening of urine, prior to reference standard methods currently utilized in microbiology analysis labo- ratory. We analyzed 962 urine samples from outpatients and inpatients of the Tor Vergata (TV) University Hospital of the University of Rome "Tor Vergata". All samples were processed both with the BiesseBioscreen and with the standard methodology adopted by the clinical microbiology laboratory of TV Hospital and the results were com- pared. Of the samples analyzed 54.9% were concordant negative with the reference method and 21.6% concordant positive, 23.3% resulted false positive and 0.2% false negative. The results obtained from BiesseBioscreen showed a sensitivity of 99.0%, indicating it as a system suitable to rule out urinary tract infection. BiesseBioscreen could represent a valid method for screening negative samples to exclude from culture test with a potential reduction in time, workload and costs of the diagnosis.
Asunto(s)
Bacterias/crecimiento & desarrollo , Bacteriuria/diagnóstico , Pruebas Diagnósticas de Rutina/métodos , Orina/microbiología , Bacterias/aislamiento & purificación , Bacteriuria/microbiología , Pruebas Diagnósticas de Rutina/instrumentación , Humanos , Juego de Reactivos para DiagnósticoRESUMEN
A central nervous system (CNS) infection, such as meningitis, is a serious and life-threatening condition. Bacterial meningitis can be severe and may result in brain damage, disability or even death. Rapid diagnosis of CNS infections and identification of the pathogenic microorganisms are needed to improve the patient outcome. Bacterial culture of a patient's cerebrospinal fluid (CSF) is currently considered the "gold standard" for diagnosing bacterial meningitis. From the CSF cultures researchers can assess the in vitro susceptibility of the causative microorganism to determine the best antibiotic treatment. However, many of the culture assays, such as microscopy and the latex agglutination test are not sensitive. To enhance pathogen detection in CSF samples we developed a multi-target real-time PCR assay that can rapidly identify six different microorganisms: Streptococcus pneumoniae, Neisseria meningitidis, Haemophilus influenzae, Streptococcus agalactiae, Listeria monocytogenes and Cryptococcus neoformans. In this study we applied this PCR analysis to 296 CSF samples from patients who were suspected of having meningitis. Of the 296 samples that were examined, 59 samples were positive according to the CSF culture and/or molecular assays. Forty-six CSF samples were positive for both the CSF culture and our real-time PCR assay, while 13 samples were positive for the real-time PCR but negative for the traditional assays. This discrepancy may have been caused by the fact that these samples were collected from 23 patients who were treated with antimicrobials before CSF sampling.
Asunto(s)
Meningitis Bacterianas/líquido cefalorraquídeo , Meningitis Bacterianas/diagnóstico , Meningitis Bacterianas/microbiología , Reacción en Cadena en Tiempo Real de la Polimerasa/métodos , Adolescente , Adulto , Anciano , Antibacterianos/uso terapéutico , ADN Bacteriano/aislamiento & purificación , Haemophilus influenzae/aislamiento & purificación , Humanos , Pruebas de Fijación de Látex , Listeria monocytogenes/aislamiento & purificación , Meningitis Bacterianas/tratamiento farmacológico , Persona de Mediana Edad , Neisseria meningitidis/aislamiento & purificación , Sensibilidad y Especificidad , Análisis de Secuencia de ADN , Streptococcus agalactiae/aislamiento & purificación , Streptococcus pneumoniae/aislamiento & purificación , Adulto JovenRESUMEN
BACKGROUND: The emergence of KPC-producing K. pneumoniae has now become a global concern. KPC beta-lactamases are plasmid-borne and, like extended spectrum beta lactamases (ESBLs), can accumulate and transfer resistance determinants to other classes of antibiotics. Therefore, infection control guidelines on early identification and control of the spread of organisms carrying these resistant determinants are needed. FINDINGS: Klebsiella pneumoniae carbapenemase (KPC) was detected in two isolates of carbapenem-resistant K. pneumoniae obtained from patients at an Italian teaching hospital. The first strain was isolated from a culture drawn from a central venous device (CVC) in a patient with Crohn's disease who was admitted to a gastroenterology ward. The second was isolated from a urine sample collected from an indwelling urinary catheter in an intensive care unit (ICU) patient with a subdural haematoma. The patients had not travelled abroad. Both isolates were resistant to all beta-lactams and were susceptible to imipenem and meropenem but resistant to ertapenem. Isolates also showed resistance to other classes of non-beta-lactam antibiotics, such as quinolones, aminoglycosides (with the exception for amikacin), trimethoprim-sulfamethoxazole (TMP-SMX) and nitrofurantoin. They were determined to contain the plasmid encoding the carbapenemase gene bla-KPC and were also positive in the Hodge test. CONCLUSIONS: This is the second report of KPC-producing isolates in Italy, but the first concerning KPC type 2 gene, and it may have important implications for controlling the transmission of microorganisms resistant to antibiotics.
RESUMEN
BACKGROUND: The first step in routine microbiology laboratory procedures is the collection and safe transportation of swab samples. This can be accomplished using ESwab Collection and Transport System (Copan Italia, Brescia -Italy). The aim of the present study was to compare the results of microscopic examination of gram stain smears prepared directly from clinical specimens, collected and transported in the ESwab, with those obtained using Amies Agar gel Transystem without charcoal (Copan). FINDINGS: Specimens were collected from 80 patients (32 vaginal swabs, 27 cervical swabs, 11 urethral swabs and 10 wound swabs). Two swabs were in random order collected from each patient, one using the conventional Amies gel Transystem, the other using ESwab. One slide was prepared for each specimen using the conventional swab and two sets of slides were prepared from the specimens collected with the ESwab: one using 100 mul and one using 50 mul of the Amies medium. All slides were gram stained using an automated Gram stainer. Microscopic examination of 240 slides (80 with conventional and 160 with ESwab) showed that the quality of smear preparation from the ESwab system, allowed for easier identification of human cells and identification of greater number of microorganisms. Microscopic examination of additional slides prepared from ESwab at 24 or 72 hours after initial collection were equivalent to those prepared when received in the laboratory within 2 hours of collection. CONCLUSION: Microscopic examination performed using ESwab, especially when preparing the slides with 100 mul, shows superior results to those obtained using the Amies gel Transystem.
RESUMEN
BACKGROUND: Large-volume culture methods for sterile body fluids employing automated blood-culture systems increase the recovery of microorganisms compared with traditional plate medium methods. However, in many instances a laboratory receives only small-volume samples. MATERIAL/METHODS: The URO-QUICK system (now HBandL), originally used to process urine samples, was evaluated for organism enrichment and determination of microbial count of fluid samples. Fluid specimens were also evaluated for their residual antimicrobial activity (RAA). The procedures were compared with results from a conventional culture procedure. The 546 samples included 106 endotracheal aspirate, 63 bronchoalveolar lavage, 139 sputum, 47 blood, 105 pleural fluid, 26 cerebrospinal fluids, and 41 peritoneal fluid samples as well as 19 other fluids including synovial fluid (n=5), ascitic fluid (n=9), fluids from the drainage of an infected central venous catheter (n=3), abdominal drainage fluid (n=1), and cholecystic fluid (n=1). RESULTS: The URO-QUICK system allowed the culture of an additional 44 samples (8%, p=0.007) compared with the traditional culturing method. The RAA test demonstrated good concordance with the reference method, showing specificity and positive predictive value of 100% for each, while the sensitivity and the negative predictive value were 67% and 76%, respectively. The microbial counts evaluated using the URO-QUICK system showed excellent agreement with traditional enumeration methods. CONCLUSIONS: The URO-QUICK system may well represent an excellent alternative to solid medium-based recovery and enumeration methods.
Asunto(s)
Líquidos Corporales/microbiología , Técnicas Microbiológicas/métodos , Bacterias/aislamiento & purificación , Recuento de Colonia Microbiana , Humanos , Juego de Reactivos para Diagnóstico , Levaduras/aislamiento & purificaciónRESUMEN
BACKGROUND: Data have accumulated implicating the involvement of oncogenic human papillomaviruses (HPVs) in bronchial carcinogenesis. We recently described the presence of oncogenic HPV transcripts in non-small cell lung cancers. OBJECTIVE: To investigate the role of oncogenic HPVs in lung carcinogenesis. MATERIAL AND METHODS: The lung cell line A549 stably infected with HPV16E6, HPV16E7 and HPVE6/E7 constructs was used to investigate the protein profile changes associated with the expression of these oncogenes. Replicated two-dimensional gel electrophoresis gels from uninfected and stably HPV16E6-, E7-, and E6/E7-infected A549 cells were compared for changes in protein profile. Protein identification was achieved by peptide mass fingerprinting by MALDI-TOF-MS and nLC-ESI-Q-TOF-MS/MS peptide ladder sequencing. RESULTS: We identified 17 different polypeptides whose average normalized spot intensity was statistically significant (p < 0.05) and differed by 2-fold. Relationships between differentially expressed proteins and the HPV-induced infection mechanism have been clustered by knowledge-base database functional association network analysis. CONCLUSION: The impact of Hsp27, annexin III, annexin IV, Gp96 and TPT1 on the cellular response mechanism to HPV infection is presented and discussed.
Asunto(s)
Regulación Neoplásica de la Expresión Génica , Proteínas Oncogénicas Virales/genética , Proteómica , Proteínas Represoras/genética , Western Blotting , Línea Celular Tumoral , Perfilación de la Expresión Génica , Humanos , Neoplasias Pulmonares/metabolismo , Espectrometría de Masas , Oncogenes , Proteínas E7 de Papillomavirus , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa , Proteína Tumoral Controlada Traslacionalmente 1RESUMEN
OBJECTIVE: Oncogenic human papillomaviruses (HPVs) are the etiological agents of cervical cancer. Different cofactors might be needed for malignant transformation, but they still remain elusive. METHODS: To delineate the role of Chlamydia trachomatis (CT) and herpes simplex virus type 2 (HSV2) in HPV-positive cervical intraepithelial neoplasia (CIN) lesions and cervical carcinoma a series of 149 cervical cancer and CIN biopsies were analyzed for CT and HSV2 DNA by PCR, and HPV genotyped by InnoLipa. Monitoring of aberrations in key intracellular pathways due to CT/HSV2 and HPV co-expression were analyzed with 13 biomarkers. RESULTS: Of the 149 samples tested, 136 were HPV DNA positive; 32/136 contained also CT DNA and 29 HSV2 DNA. Detection of CT was significantly (p = 0.0001) related to multiple-type HPV infections, while HSV2 was of borderline significance (p = 0.053). Of the 13 biomarkers tested, cytoplasmic and nuclear NF-kappaB and VEGF-C were significantly increased in CT+/HPV+ lesions; p = 0.023, p = 0.045, and p = 0.020 as well as survivin, p = 0.026. Survivin was the only marker that was overexpressed also in HSV2+/HPV+ lesions, p = 0.027. CONCLUSIONS: CT infection favors the entry and persistence of multiple HR-HPV types, which leads to viral integration, inhibition of apoptosis, overexpression of E6/E7 oncogenes and cell transformation.
Asunto(s)
Chlamydia trachomatis/aislamiento & purificación , Herpesvirus Humano 2/aislamiento & purificación , Papillomaviridae/aislamiento & purificación , Infecciones por Papillomavirus/complicaciones , Displasia del Cuello del Útero/microbiología , Displasia del Cuello del Útero/virología , Adulto , Anciano , Anciano de 80 o más Años , Chlamydia trachomatis/genética , ADN Bacteriano/análisis , ADN Viral/análisis , Femenino , Perfilación de la Expresión Génica , Herpesvirus Humano 2/genética , Humanos , Proteínas Inhibidoras de la Apoptosis , Proteínas Asociadas a Microtúbulos/biosíntesis , Proteínas Asociadas a Microtúbulos/genética , Persona de Mediana Edad , FN-kappa B/biosíntesis , FN-kappa B/genética , Proteínas de Neoplasias/biosíntesis , Proteínas de Neoplasias/genética , Papillomaviridae/clasificación , Papillomaviridae/genética , Reacción en Cadena de la Polimerasa , Survivin , Factor C de Crecimiento Endotelial Vascular/biosíntesis , Factor C de Crecimiento Endotelial Vascular/genéticaRESUMEN
BACKGROUND: The nosocomial infections surveillance system must be strongly effective especially in highly critic areas, such as Intensive Care Units (ICU). These areas are frequently an epidemiological epicentre for transmission of multi-resistant pathogens, like Acinetobacter baumannii. As an epidemic outbreak occurs it is very important to confirm or exclude the genetic relationship among the isolates in a short time. There are several molecular typing systems used with this aim. The Repetitive sequence-based PCR (REP-PCR) has been recognized as an effective method and it was recently adapted to an automated format known as the DiversiLab system. METHODS: In the present study we have evaluated the combination of a newly introduced software package for the control of hospital infection (VIGI@ct) with the DiversiLab system. In order to evaluate the reliability of the DiversiLab its results were also compared with those obtained using f-AFLP. RESULTS: The combination of VIGI@ct and DiversiLab enabled an earlier identification of an A. baumannii epidemic cluster, through the confirmation of the genetic relationship among the isolates. This cluster regards 56 multi-drug-resistant A. baumannii isolates from several specimens collected from 13 different patients admitted to the ICU in a ten month period. The A. baumannii isolates were clonally related being their similarity included between 97 and 100%. The results of the DiversiLab were confirmed by f-AFLP analysis. CONCLUSION: The early identification of the outbreak has led to the prompt application of operative procedures and precautions to avoid the spread of pathogen. To date, 6 months after the last A. baumannii isolate, no other related case has been identified.
Asunto(s)
Infecciones por Acinetobacter/prevención & control , Acinetobacter baumannii/genética , Infección Hospitalaria/prevención & control , Control de Infecciones/métodos , Reacción en Cadena de la Polimerasa/métodos , Infecciones por Acinetobacter/microbiología , Infecciones por Acinetobacter/transmisión , Acinetobacter baumannii/clasificación , Acinetobacter baumannii/aislamiento & purificación , Análisis del Polimorfismo de Longitud de Fragmentos Amplificados , Sistemas de Información en Laboratorio Clínico/instrumentación , Células Clonales , Infección Hospitalaria/transmisión , Dermatoglifia del ADN , Brotes de Enfermedades/prevención & control , Microbiología Ambiental , Femenino , Humanos , Control de Infecciones/instrumentación , Unidades de Cuidados Intensivos , Italia , Masculino , Persona de Mediana Edad , Reacción en Cadena de la Polimerasa/instrumentación , Vigilancia de Guardia , Programas InformáticosRESUMEN
BACKGROUND: As a part of our search for oncogenic viruses as potential etiological agents in human malignancies, our studies on human papillomaviruses (HPV) were extended to analysis of the 3 polyomaviruses (SV40, BKV and JCV) in colorectal carcinomas. PATIENTS AND METHODS: Archival tumour samples from 71 patients with colorectal cancer were analyzed for the sequences of SV40, BKV, JCV and HPV using PCR-based techniques. HPV genotypes were determined using sequencing and reverse blot hybridization (InnoLipa). RESULTS: Amplification of BKV and JCV with the primer pair PEP-1 and PEP-2 and subsequent restriction digestion of the amplified products with BamH I disclosed BKV in 6/66 (9%) of the samples, whereas none contained JCV. SV40 was amplified in 10/66 (15.1%) samples and confirmed by sequencing analysis. In pair-wise analysis for co-infections, the samples were significantly different in their BKV-JCV and JCV-SV40 status, in contrast to their BKV-SV40 co-infection status. HPV DNA was detected in 22/66 (33.3%) of the samples analysed with either the MY09/11 or SPF primer mix. Of these 22 HPV infections, 7 were single-type infections and 15 contained multiple HPV types. HPV detection or type distribution showed no relationship to the gender of the patients or histological grade of the tumour. HPV status was not significantly related to detection of BKV, JCV or SV40. Similarly, in pair-wise analysis for co-infections, the samples were significantly different in their status of HPV-BKV (p=0.0006), HPV-JCV (p=0.0001), and HPV-SV40 (p=0.019), implicating that HPV and the 3 polyomaviruses are rarely detected concomitantly in the same samples. CONCLUSION: Taking the known molecular mechanisms of action of these individual viruses, there is a chance that these viruses could alter the mechanisms of cell cycle control and inhibit apoptosis, thus potentially causing chromosomal instability and promoting colorectal oncogenesis.
Asunto(s)
Adenocarcinoma/virología , Neoplasias Colorrectales/virología , Infecciones por Polyomavirus/complicaciones , Poliomavirus/aislamiento & purificación , Infecciones Tumorales por Virus/complicaciones , Virus BK/aislamiento & purificación , ADN Viral/aislamiento & purificación , Humanos , Virus JC/aislamiento & purificación , Papillomaviridae/genética , Papillomaviridae/aislamiento & purificación , Infecciones por Papillomavirus/complicaciones , Infecciones por Papillomavirus/virología , Adhesión en Parafina , Infecciones por Polyomavirus/virología , Virus 40 de los Simios/aislamiento & purificación , Infecciones Tumorales por Virus/virologíaRESUMEN
Comprehensive multivariate models were used to disclose whether any of our previously analyzed 13 markers would be independent predictors of intermediate end point markers in cervical carcinogenesis. The expression of the following biomarkers, E-cadherin, extracellular signal-regulated kinase 1, 67-kd laminin receptor (LR67), matrix metalloproteinase 2, tissue inhibitor of metalloproteinase 2, nuclear factor-kappaB, nm23-H1, p16, proliferating cell nuclear antigen, survivin, human telomerase reverse transcriptase, topoisomerase 2alpha, and vascular endothelial growth factor (VEGF) C in 150 cervical cancer (CC) and 152 cervical intraepithelial neoplasia (CIN) lesions were determined immunohistochemically. Multivariate models were constructed to test predictive power of the markers for 3 outcomes: (1) high-grade CIN, (2) high-risk human papillomavirus (HR-HPV), and (3) CC survival. Performance indicators were calculated and compared by the areas under receiver operating characteristic (ROC) curve. Three marker panels were identified consisting of 5 independent predictors of CIN2 (E-cadherin, extracellular signal-regulated kinase 1, LR67, topoisomerase 2alpha, and VEGF-C), 3 predictors of HR-HPV (survivin, p16, and human telomerase reverse transcriptase), and 2 predictors of CC survival (nm23-H1 and tissue inhibitor of metalloproteinase 2). In predicting CIN2, the best balance between sensitivity (SE) and specificity (SP) was obtained by combining the 2 most powerful predictors in panel 1 (VEGF-C and LR67), giving the area under ROC curve, 0.897 (95% confidence interval [CI], 0.847-0.947); odds ratio, 86.27 (95% CI, 19.71-377.47); SE, 86.0%; SP, 93.3%; positive predictive value (PPV), 99.1%; and negative predictive value (NPV), 43.1%. In a hypothetical screening setting (10,000 women; CIN2 prevalence, 1%), this marker combination should theoretically detect CIN2 with 86.0% SE, 100% SP, 99.1% PPV, and 99.6% NPV, area under ROC curve of 0.930 (95% CI, 0.909-0.951), and odds ratio, 29998.0 (95% CI, 7,879.0-37,338.0). Combining 2 markers (LR67 and VEGF-C) enables accurate detection of high-grade CIN in a clinical setting. However, testing the performance of this marker combination in a screening setting necessitates their analysis in cytological samples.
Asunto(s)
Biomarcadores de Tumor/metabolismo , Infecciones por Papillomavirus/diagnóstico , Infecciones por Papillomavirus/metabolismo , Displasia del Cuello del Útero/diagnóstico , Displasia del Cuello del Útero/metabolismo , Neoplasias del Cuello Uterino/diagnóstico , Neoplasias del Cuello Uterino/metabolismo , Progresión de la Enfermedad , Femenino , Humanos , Modelos Teóricos , Análisis Multivariante , Infecciones por Papillomavirus/complicaciones , Valor Predictivo de las Pruebas , Pronóstico , Receptores de Laminina/metabolismo , Proteínas Ribosómicas , Sensibilidad y Especificidad , Neoplasias del Cuello Uterino/virología , Factor C de Crecimiento Endotelial Vascular/metabolismo , Displasia del Cuello del Útero/virologíaRESUMEN
Lung cancer is the leading cause of cancer related death in Western countries. Several factors have been implicated in its aetiology: cigarette smoking, environmental pollution, asbestos and genetic factors. The possible involvement of human papillomavirus (HPV) in bronchial squamous cell lesions was first suggested in 1979 by Syrjänen. Since then, several studies have confirmed the presence of HPV DNA in about 20% of lung cancer cases examined, with HPV16 and 18 as the two most frequently found oncogenic viral types. More recently, these data have been supported by the detection of E6 and E7 transcripts in HPV-positive lung cancer cases, reinforcing the hypothesis that oncogenic HPVs could act as cofactors in bronchial carcinogenesis. This published literature is briefly reviewed and new data of the authors on detection of E6 and E7 transcripts in lung cancer samples are presented.
Asunto(s)
Neoplasias Pulmonares/virología , Proteínas Oncogénicas Virales/genética , Papillomaviridae/genética , Infecciones por Papillomavirus/complicaciones , ADN Viral/análisis , Humanos , Proteínas Oncogénicas Virales/biosíntesis , Oncogenes , Infecciones por Papillomavirus/virología , ARN Mensajero/análisis , ARN Mensajero/biosíntesis , ARN Mensajero/genéticaRESUMEN
The BK polyomavirus (BKV) is widespread in the general population. In transplant recipients, the patients' weakened immune response may encourage reactivation of latent infection, leading to BKV-related diseases. Rapid and quantitative detection might help to delineate viral reactivation patterns and could thus play an important role in their clinical management. In our study we developed an "in-house" quantitative real-time PCR to detect BKV DNA. The effectiveness of this assay was evaluated by a retrospective analysis of 118 plasma specimens from 22 bone marrow transplant (BMT) recipients and 107 samples from immunocompetent subjects. Eight (36.3%) of the 22 bone marrow transplant recipients tested positive for BKV. The viral load varied from specimen to specimen (10 to 10(5) copies/ml). BKV related disease like hemorrhagic cystitis (HC) was diagnosed in three patients. Specimens from the control group all tested negative. Our results showed the high sensitivity of the real-time PCR, allowing accurate and reproducible measuring of the viral load in order to identify patients at risk for BKV-related diseases. With due caution in interpreting threshold values, the real-time PCR could provide a rapid, sensitive and specific tool for detecting BKV and distinguishing latent and active infection.