LUIZ HENRIQUE DA SILVA NALI
Projetos de Pesquisa
Unidades Organizacionais
LIM/52 - Laboratório de Virologia, Hospital das Clínicas, Faculdade de Medicina
19 resultados
Resultados de Busca
Agora exibindo 1 - 10 de 19
- Viremia and viruria of trichodysplasia spinulosa-associated polyomavirus before the development of clinical disease in a kidney transplant recipient(2019) PIERROTTI, Ligia Camera; URBANO, Paulo Roberto Palma; NALI, Luiz Henrique da Silva; ROMANO, Camila Malta; BICALHO, Camila da Silva; ARNONE, Marcelo; VALENTE, Neusa Sakai; PANNUTI, Claudio Sergio; DAVID-NETO, Elias; AZEVEDO, Luiz SergioTrichodysplasia spinulosa (TS) is a rare disease associated with immunosuppression and induced by a polyomavirus denominated Tricodisplasia Polyomavirus (TSPyV). We report a case of TS 6 months after kidney transplantation in a 65 years-old woman under immunosuppression therapy with prednisone, mycophenolate and tacrolimus. The patient developed follicular papules on the face with a thickening of the skin and alopecia of the eyebrows, leading to distortion of the face and a leonine appearance characteristic of the disease. The skin biopsy confirmed the clinical diagnosis and the presence of TSPyV DNA in the skin was detected. Staining for SV40 was positive. Immunosuppression was changed: mycophenolate was withdrawn, tacrolimus reduced and everolimus added. Intravenous cidofovir and later on leflunomide were added. Although the literature has reported clinical success with topical cidofovir, we were unable to use it because this drug is not available. There was an improvement of skin lesions and on cosmetic appearance. The patient had three rejections (one clinically diagnosed and two other biopsy proven), progressed with renal failure and graft loss. Retrospective analysis of stored urine and blood samples detected TSPyV DNA in some of those samples two months before the TS clinical development. This case highlights the TSPyV detection in blood and urine samples before the development of skin lesions.
- HIGH PREVALENCE OF THE SIMULTANEOUS EXCRETION OF POLYOMAVIRUSES JC AND BK IN THE URINE OF HIV-INFECTED PATIENTS WITHOUT NEUROLOGICAL SYMPTOMS IN SAO PAULO, BRAZIL(2012) NALI, Luiz Henrique da Silva; CENTRONE, Cristiane de Campos; URBANO, Paulo Roberto Palma; PENALVA-DE-OLIVEIRA, Augusto Cesar; VIDAL, Jose Ernesto; MIRANDA, Erique Peixoto; PANNUTI, Claudio Sergio; FINK, Maria Cristina Domingues da SilvaObjective: To evaluate the prevalence of the urinary excretion of BKV and JCV in HIV-infected patients without neurological symptoms. Methods: Urine samples from HIV-infected patients without neurological symptoms were tested for JC virus and BK virus by PCR. Samples were screened for the presence of polyomavirus with sets of primers complementary to the early region of JCV and BKV genome (AgT). The presence of JC virus or BK virus were confirmed by two other PCR assays using sets of primers complementary to the VP1 gene of each virus. Analysis of the data was performed by the Kruskal-Wallis test for numerical data and Pearson or Yates for categorical variables. Results: A total of 75 patients were included in the study. The overall prevalence of polyomavirus DNA urinary shedding was 67/75 (89.3%). Only BKV DNA was detected in 14/75 (18.7%) urine samples, and only JCV DNA was detected in 11/75 (14.7%) samples. Both BKV and JCV DNA were present in 42/75 (56.0%) samples. Conclusion: In this study we found high rates of excretion of JCV, BKV, and simultaneous excretion in HIV+ patients. Also these results differ from the others available on the literature.
- Preventive measures for "Pet Friendly" lodging facilities: association of Leishmaniasis expansion route in Sao Paulo and preventive measures for regional animals displacement(2017) CARVALHO, Camila Aparecida de; FUJITA, Dennis Minoru; NALI, Luiz Henrique da Silva; ANDRADE JUNIOR, Heitor Franco de; HIRAMOTO, Roberto Mitsuyoshi
- Genomic analysis of ERVWE2 locus in patients with multiple sclerosis: absence of genetic association but potential role of human endogenous retrovirus type W elements in molecular mimicry with myelin antigen(2013) OLIVAL, Guilherme S. do; FARIA, Thiago S.; NALI, Luiz H. S.; OLIVEIRA, Augusto C. P. de; CASSEB, Jorge; VIDAL, Jose E.; CAVENAGHI, Vitor B.; TILBERY, Charles P.; MORAES, Lenira; FINK, Maria C. S.; SUMITA, Laura M.; PERRON, Herve; ROMANO, Camila M.Human endogenous retroviruses (HERVs) arise from ancient infections of the host germline cells by exogenous retroviruses, constituting 8% of the human genome. Elevated level of envelope transcripts from HERVs-W has been detected in CSF, plasma and brain tissues from patients with Multiple Sclerosis (MS), most of them from Xq22.3, 15q21.3, and 6q21 chromosomes. However, since the locus Xq22.3 (ERVWE2) lack the 5' LTR promoter and the putative protein should be truncated due to a stop codon, we investigated the ERVWE2 genomic loci from 84 individuals, including MS patients with active HERV-W expression detected in PBMC. In addition, an automated search for promoter sequences in 20 kb nearby region of ERVWE2 reference sequence was performed. Several putative binding sites for cellular cofactors and enhancers were found, suggesting that transcription may occur via alternative promoters. However, ERVWE2 DNA sequencing of MS and healthy individuals revealed that all of them harbor a stop codon at site 39, undermining the expression of a full-length protein. Finally, since plaque formation in central nervous system (CNS) of MS patients is attributed to immunological mechanisms triggered by autoimmune attack against myelin, we also investigated the level of similarity between envelope protein and myelin oligodendrocyte glycoprotein (MOG). Comparison of the MOG to the envelope identified five retroviral regions similar to the Ig-like domain of MOG. Interestingly, one of them includes T and B cell epitopes, capable to induce T effector functions and circulating Abs in rats. In sum, although no DNA substitutions that would link ERVWE2 to the MS pathogeny was found, the similarity between the envelope protein to MOG extends the idea that ERVEW2 may be involved on the immunopathogenesis of MS, maybe facilitating the MOG recognizing by the immune system. Although awaiting experimental evidences, the data presented here may expand the scope of the endogenous retroviruses involvement on MS pathogenesis.
- Expression of human endogenous retrovirus K and W in babies(2017) NALI, L. H. S.; OLIVEIRA, A. C. S.; ALVES, D. O.; CALEIRO, G. S.; NUNES, C. F.; GERHARDT, D.; SUCCI, R. C. M.; ROMANO, Camila M.; MACHADO, D. M.Here we determined the relative expression of HERV-K and W proviruses in HIV infected and non-infected mothers as well as their respective babies up to 1 year-old. HIV-infected mothers, their babies and uninfected control groups presented expression of both HERV-K and HERV-W with relatively high frequency. While the level of HERV-K expression was similar among groups, the level of HERV-W expression in HIV-infected mothers was four-fold higher than the uninfected mothers from the control group (p < 0.01). HERV-W was down regulated in HIV-exposed babies in comparison to non-exposed babies. To our knowledge, this is the first report of HERV transcriptional activity in babies from 0-1 year-old.
- Variable sources of Bk virus in renal allograft recipients(2019) URBANO, Paulo Roberto P.; NALI, Luiz H. da Silva; OLIVEIRA, Renato dos R.; SUMITA, Laura M.; FINK, Maria Cristina D. da Silva; PIERROTTI, Ligia C.; BICALHO, Camila da Silva; DAVID-NETO, Elias; PANNUTI, Claudio S.; ROMANO, Camila M.BK virus is the causative agent of polyomavirus-associated nephropathy, a major cause of kidney transplant failure affecting 1%-10% of recipients. Previous studies that investigated the viral source on the kidney recipient pointed that the donor is implicated in the origin of human polyomavirus BK (BKPyV) infection in recipients, but giving the low genetic variability of BKPyV this subject is still controversial. The aim of this study was to determine if BKPyV replicating in kidney recipients after transplantation is always originated from the donor. Urine and blood samples from 68 pairs of living donors and kidney recipients who underwent renal transplantation from August 2010-September 2011 were screened for BKPyV by real time polymerase chain reaction. Only three recipients presented viremia. When both donors and recipients were BKPyV positive, a larger fragment of VP1 region was obtained and sequenced to determine the level of similarity between them. A phylogenetic tree was built for the 12 pairs of sequences obtained from urine and high level of similarity among all sequences was observed, indicating that homology inferences for donor and recipient viruses must be cautiously interpreted. However, a close inspection on the donor-recipient pairs sequences revealed that 3 of 12 pairs presented considerably different viruses and 4 of 12 presented mixed infection, indicating that the source of BKPyV infection is not exclusively derived from the donor. We report that about 60% of the renal recipients shed BKPyV genetically distinct from the donor, confronting the accepted concept that the donor is the main source of recipients' infection.
- The fast transmission of infectious diseases around the world - a new concern to the public health(2016) FUJITA, Dennis Minoru; NALI, Luiz Henrique da Silva; URBANO, Paulo Roberto; SOEIRO, Debora Maringoni; ANDRADE JR., Heitor Franco de
- Potential measles transmission risk in mass gatherings: Are we safe for the Olympic games-Rio 2016?(2016) NALI, Luiz Henrique da Silva; FUJITA, Dennis Minoru; SALVADOR, Felipe Scassi; FINK, Maria Cristina Domingues da Silva; ANDRADE JR., Heitor Franco de; PANNUTI, Claudio Sergio; LUNA, Expedito Jose de Albuquerque
- New findings about trichodysplasia spinulosa-associated polyomavirus (TSPyV)-novel qPCR detects TSPyV-DNA in blood samples(2016) URBANO, Paulo R.; NALI, Luiz H. S.; BICALHO, Camila S.; PIERROTTI, Ligia C.; DAVID-NETO, Elias; PANNUTI, Claudio S.; ROMANO, Camila M.A new real-time PCR assay for trichodysplasia spinulosa associated polyomavirus (TSPyV) DNA detection was designed, and blood samples from kidney transplant recipients and healthy individuals were screened. TSPyV-DNA was not detected in blood from healthy individuals, but 26.8% of kidney recipients presented TSPyV-DNA. This is the first report of TSPyV viremia.
- Natalizumab treatment for multiple sclerosis: updates and considerations for safer treatment in JCV positive patients(2014) NALI, Luiz Henrique da Silva; MORAES, Lenira; FINK, Maria Cristina Domingues; CALLEGARO, Dagoberto; ROMANO, Camila Malta; OLIVEIRA, Augusto Cesar Penalva deNatalizumab is currently one of the best options for treatment of patients with Multiple Sclerosis who have failed traditional prior therapies. However, prolonged use, prior immunosuppressive therapy and anti-JCV antibody status have been associated with increased risk of developing progressive multifocal leukoencephalopathy (PML). The evaluation of these conditions has been used to estimate risks of PML in these patients, and distinct (sometimes extreme) approaches are used to avoid the PML onset. At this time, the biggest issue facing the use of Natalizumab is how to get a balance between the risks and the benefits of the treatment. Hence, strategies for monitor JCV-positive patients undergoing Natalizumab treatment are deeply necessary. To illustrate it, we monitored JCV/DNA in blood and urine of a patient receiving Natalizumab for 12 months. We also bring to discussion the effectiveness of the current methods used for risk evaluation, and the real implications of viral reactivation.