NEUSA YURIKO SAKAI VALENTE
Projetos de Pesquisa
Unidades Organizacionais
Instituto Central, Hospital das Clínicas, Faculdade de Medicina - Médico
LIM/53 - Laboratório de Micologia, Hospital das Clínicas, Faculdade de Medicina
LIM/53 - Laboratório de Micologia, Hospital das Clínicas, Faculdade de Medicina
8 resultados
Resultados de Busca
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- Evidence for neurogenic inflammation in lichen planopilaris and frontal fibrosing alopecia pathogenic mechanism(2020) DOCHE, Isabella; WILCOX, George L.; ERICSON, Marna; VALENTE, Neusa S.; ROMITI, Ricardo; MCADAMS, Brian. D.; HORDINSKY, Maria K.Lichen planopilaris (LPP) and frontal fibrosing alopecia (FFA) are lymphocytic scarring alopecias affecting primarily the scalp. Although both diseases may share some clinical and histopathological features, in the last decade, FFA has become an ""epidemic"" particularly in Europe, North and South America with unique clinical manifestations compared to LPP, thus, raising the idea that this disease may have a different pathogenesis. Symptoms such as scalp burning, pruritus or pain are usually present in both diseases, suggesting a possible role for nerves and neuropeptides in the pathogenesis of both diseases. Based on some previous studies, neuropeptides, such as substance P (SP) and calcitonin gene-related peptide (CGRP), have been associated with lipid metabolism and many chronic inflammatory disorders. In this study, we asked if these neuropeptides are associated with LPP and FFA scalp lesions. Alteration in the expression of SP and CGRP in affected and unaffected scalp skin from patients with both diseases was found with examination of sections using immunohistochemical techniques and confocal microscopy. We then quantitatively assessed and compared SP and CGRP expression from control, LPP and FFA scalp biopsies. Although LPP and FFA share similar histopathologic findings, opposite results were found in affected and unaffected scalp in the ELISA tests, suggesting that these diseases may have different pathogenic mechanisms. We also found presence of histopathological inflammation irrespective of evident clinical lesions, which raises the possibility that both diseases may be more generalized processes affecting the scalp.
- Immunoexpression of adhesion molecules during human fetal hair development(2020) SILVA, Laura Maria Andrade; HSIEH, Ricardo; LOURENCO, Silvia Vanessa; OTTONI, Veronica; VALENTE, Neusa; FERNANDES, Juliana DumetIntroduction. Hair follicles are produced in a cyclical manner and the machinery involved in the reproduction of these follicles is present since the fetal stage. Although extensive research has been done on the human hair follicle, very little is known about the importance of adhesion molecules in its development. Material and methods. We analyzed here, the immunoexpression of beta-1 integrin, p-cadherin, e-cadherin, and beta-catenin in hair follicles from 26 formalin-fixed and paraffin-embedded skin samples from human embryos and fetus between 12-23 weeks of gestational age. Results. The adhesion molecules beta-1 integrin and e-cadherin/p-cadherin were expressed from 12 weeks and seemed to play a role in regulating epidermis invagination. Beta-catenin immunostaining was negative in all cases; down regulation of this protein may be necessary for fetal hair development and thus facilitating hair follicle down growth. Discussion/Conclusion. Adhesion molecules are essential for hair follicle down growth and proliferation; integrins and cadherins play a major role in this process. More studies are needed to describe hair follicle development.
- Immunostaining study of cytokeratins in human hair follicle development(2020) SILVA, Laura Maria Andrade; HSIEH, Ricardo; LOURENCO, Silvia Vanessa; VALENTE, Neusa Yuriko Sakai; PAIVA, Geise Rezende; FERNANDES, Juliana DumetBackground: The hair follicle is a unique structure, one of the most dynamic structures in mammalians, which can reproduce in every new cycle all the mechanism involved in its fetal development. Although a lot of research has been made about the human hair follicle much less has been discovered about the importance of the cytokeratins (CKs) in its development. Objective: Study the immunohistochemical pattern of epithelial CKs during human hair follicle development. Methods: We performed an immunohistochemical study using fresh post-mortem skin biopsies of human fetuses between 4 and 25 weeks of gestational age to study the expression of cytokeratins (CKs): CK1, CK10, CK13, CK14, CK16 and CK20 during human hair follicle fetal development. Study limitations: Restrospective study with a good number of makers but with a small population. Results/conclusion: We found that, the CKs were expressed in an intermediate time during follicular development. The epithelial CKs (CK1, CK14, CK10, CK13) and the epithelial CKs witha proliferative character such as CK16 were expressed first, as markers of cellular maturation and follicular keratinization. At a later phase, CK20 was expressed in more developed primitive hair follicles as previously discussed in literature. (C) 2020 Sociedade Brasileira de Dermatologia.
- A case-control study of HLA alleles in Brazilian patients with Melkersson-Rosenthal syndrome(2020) GAVIOLI, Camila F. B.; NICO, Marcello M. S.; PANAJOTOPOULOS, Nicolas; RODRIGUES, Helcio; ROSALES, Claudia B.; VALENTE, Neusa Y. S.; FLOREZI, Giovanna P.; V, Silvia LourencoMelkersson-Rosenthal syndrome (MRS) is a neuromucocutaneous disease that manifests by the triad of recurrent orofacial edema (frequently as cheilitis granulomatosa), relapsing facial paralysis and plicated tongue. The cause of MRS remains unknown, but genetic predisposal and a relationship with inflammatory bowel disease are suspected. The objective of this research was to compare the frequency of class I and II HLA alleles in patients with a confirmed diagnosis of MRS with those of a healthy control group. We conduct a case-control study and typed of HLA A, B, C, DR, and DQ using molecular techniques. The study included 36 patients with MRS and 297 patients in the control group. There was an increase in the expression of HLA A*02 (p = 0.0269; OR: 1,79 [1,045-2,973]), HLA DRB1*11 (p < 0,0001; OR: 4,009 [2,214-7,277]), HLA DRB1*13 (not statistically significant) and HLA DQB1*03 (p = 0,0177; OR: 1,829 [1,122-2,978]) and low levels of HLA A*01 (p = 0.0046; OR: 0,097 [0,009-0,538]), HLA DRB1*04 (p = 0.0274; OR: 0,228 [0,053-0,844]), HLA DRB1*07 (p = 0,0091; OR: 0,183 [0,043-0,670]) and HLA DQB1*02 (p = 0.0051; OR: 0,312 [0,143-0,721]) in MRS patients compared with the control group. Crohn disease (CD) patients had disparate genetic profiles versus those with MRS. This single-institution study had a small cohort, because this disease is rare. Conclusions: There is a genetic predisposition toward MRS, involving associated and protective genes.
- Poikilodermatous Mycosis Fungoides: Comparative Study of Clinical, Histopathological and Immunohistochemical Features(2020) BERG, Roberta Vasconcelos; VALENTE, Neusa Yuriko Sakai; FANELLI, Camilla; WU, Isabelle; PEREIRA, Juliana; ZATZ, Roberto; SANCHES, Jose AntonioBackground: Poikilodermatous mycosis fungoides (pMF) is characterized by poikiloderma areas, typically involving the major flexural areas and trunk. Its presentation can be generalized or admixed with other forms of MF. Previous studies fail to correlate the clinical presentation with prognosis and laboratory findings. Some reports show pityriasis lichenoides chronica (PLC) preceding the poikiloderma. Objectives: Correlate prognostic, histopathological and molecular aspects of pMF with its clinical presentation. Methods: Retrospective analysis of 14 cases of generalized pMF (GpMF), 22 of localized pMF (LpMF) and 17 of pMF admixed with other forms of MF (mix-pMF). Results: Female predominance and lower age at diagnosis was found in all groups compared to classic MF, a high prevalence of PLC-like lesions in the GpMF group and a high rate of hypopigmented lesions in the mix-pMF group. There were 2 deaths within the GpMF group. Histology was similar to previously reported findings, as was the prevalence of CD4 T-cell infiltrate, compared to CD8. The T-cell clonality positivity was lower in the GpMF group, compared to other groups (27% GpMF, 80% LpMF and 100% mix-pMF). Discussion: This is the first article to categorize the different forms of pMF and correlate them with clinical and laboratory findings. The dermatological presentation differs among the groups. There was a high frequency of PLC-like lesions within the GpMF group and of hypopigmented lesions in mix-pMF. The histological and immunohistochemical findings were similar to those previously reported. Aggressive treatments are not recommended due to the good prognosis of all pMF forms. The low positivity of T-cell clonality in the GpMF group should be investigated.
- Overexpression of the aryl hydrocarbon receptor in frontal fibrosing alopecia and lichen planopilaris: a potential pathogenic role for dioxins?: an investigational study of 38 patients(2020) DOCHE, I.; PAGLIARI, C.; HORDINSKY, M. K.; WILCOX, G. L.; RIVITTI-MACHADO, M. C. M.; ROMITI, R.; VALENTE, N. Y. S.; SHAIK, J. A.; SALDANHA, M.; SOTTO, M. N.
- Normal-appearing scalp areas are also affected in lichen planopilaris and frontal fibrosing alopecia: An observational histopathologic study of 40 patients(2020) DOCHE, Isabella; ROMITI, Ricardo; HORDINSKY, Maria K.; VALENTE, Neusa S.Lichen planopilaris (LPP) and frontal fibrosing alopecia (FFA) are lymphocyte-mediated scarring alopecias which clinically affect primarily the anterior and mid-scalp. However, unaffected scalp areas have not yet been investigated in a systemic manner. In this study, we assessed histopathologic changes in affected and unaffected scalp in both diseases and healthy control subjects and compared these findings with clinical signs and scalp symptoms. We have demonstrated that ""normal-appearing"" scalp that is devoid of clinical lesions of LPP and FFA showed lymphocytic perifollicular inflammation around the isthmus/infundibulum areas in 65% of biopsy specimens, perifollicular fibrosis in 15% and mucin deposits in 7.5% of the cases. None of these findings were found in control samples. No direct correlation was found between the degree of histopathological inflammation, scalp symptoms and clinical lesions in the corresponding affected scalp areas. This preliminary study suggests that both diseases may be more generalized processes which affect the scalp and therefore need systemic or total scalp therapy.
- Clinicopathological analysis of acral melanoma in a single center: a study of 45 cases(2020) SOUZA, Bruno de Castro e; SILVA, Diego Henrique Morais; MIYASHIRO, Denis; KAKIZAKI, Priscila; VALENTE, Neusa Yuriko SakaiOBJECTIVE: The relationship between the clinicopathological and sociodemographics characteristics of acral melanomas diagnosed at the Hospital do Servidor Publico Estadual de Sao Paulo was analyzed and traced between 1997 and 2016. METHODS: An observational, descriptive, and retrospective study of patients diagnosed with acral melanoma was performed at Hospital do Servidor Publico Estadual de Sao Paulo. Sociodemographic and clinicopathological characteristics were collected and analyzed. RESULTS: Forty-five patients with acral melanomas were found during the evaluation period. Thirty-one were females, and 14 were males (68.89% and 31.3%, respectively). Most of the cases were invasive (88.37%), and the predominant histological subtype was the acral lentiginous (91.11%). The plantar region was the most prevalent (64.44%). The median Breslow index was 3 mm, and there was a tendency towards greater severity in male patients. CONCLUSIONS: Acral site melanomas are detected diagnosed when they reach more advanced stages, which leads to a worse prognosis for patients. Late detection assumes even greater importance in highly mixed and black populations, such as the Brazilian population.