Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 6 de 6
Mais filtros

Base de dados
Intervalo de ano de publicação
Acta Histochem ; 123(6): 151771, 2021 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-34419757


Tumors of the submandibular salivary gland (SMG) are uncommon but sufficiently frequent for the physician to consider them in routine examinations and for the pathologist to be prepared to differentiate them from other tissue abnormalities. However, scarcity of specimens makes training difficult, a situation compounded by the lack of accepted universal diagnostic guidelines. Furthermore, there is little information on the chaperone system (CS) of the gland, despite the increasing evidence of its participation in carcinogenesis as a biomarker for diagnosis and patient follow up, and in the mechanisms by which the tumor cells thrive. We are investigating this aspect of various tumors, and here we describe standardized methods for assessing the tissue levels of two chaperones, Hsp27 and Hsp60, in normal SMG and its tumors. We present illustrative results obtained with immunohistochemistry (IHC) and immunofluorescence-confocal microscopy (IF-CM), which we propose as a platform onto which a data base could be built by adding new information and which would provide material for developing guidelines for tumor identification and monitoring. The initial findings are encouraging in as much as the tumors surveyed showed quantitative patterns of Hsp27 and Hsp60 that distinguished tumoral from normal tissue and certain tumors from the others, and the results from IHC were confirmed by IF-CM.

Nat Commun ; 12(1): 5006, 2021 08 18.
Artigo em Inglês | MEDLINE | ID: mdl-34408135


Obesity is a strong risk factor for cancer progression, posing obesity-related cancer as one of the leading causes of death. Nevertheless, the molecular mechanisms that endow cancer cells with metastatic properties in patients affected by obesity remain unexplored.Here, we show that IL-6 and HGF, secreted by tumor neighboring visceral adipose stromal cells (V-ASCs), expand the metastatic colorectal (CR) cancer cell compartment (CD44v6 + ), which in turn secretes neurotrophins such as NGF and NT-3, and recruits adipose stem cells within tumor mass. Visceral adipose-derived factors promote vasculogenesis and the onset of metastatic dissemination by activation of STAT3, which inhibits miR-200a and enhances ZEB2 expression, effectively reprogramming CRC cells into a highly metastatic phenotype. Notably, obesity-associated tumor microenvironment provokes a transition in the transcriptomic expression profile of cells derived from the epithelial consensus molecular subtype (CMS2) CRC patients towards a mesenchymal subtype (CMS4). STAT3 pathway inhibition reduces ZEB2 expression and abrogates the metastatic growth sustained by adipose-released proteins. Together, our data suggest that targeting adipose factors in colorectal cancer patients with obesity may represent a therapeutic strategy for preventing metastatic disease.

Tecido Adiposo/citologia , Reprogramação Celular , Neoplasias do Colo/fisiopatologia , Células-Tronco Neoplásicas/citologia , Nicho de Células-Tronco , Tecido Adiposo/metabolismo , Animais , Neoplasias do Colo/genética , Neoplasias do Colo/metabolismo , Neoplasias do Colo/patologia , Fator de Crescimento de Hepatócito/genética , Fator de Crescimento de Hepatócito/metabolismo , Humanos , Interleucina-6/genética , Interleucina-6/metabolismo , Masculino , Camundongos , Camundongos SCID , MicroRNAs/genética , MicroRNAs/metabolismo , Metástase Neoplásica , Células-Tronco/citologia , Células-Tronco/metabolismo , Homeobox 2 de Ligação a E-box com Dedos de Zinco/genética , Homeobox 2 de Ligação a E-box com Dedos de Zinco/metabolismo
Int J Surg Case Rep ; 77S: S147-S151, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33191188


INTRODUCTION: Burkitt's lymphoma (BL), an aggressive subtype of non-Hodgkin lymphoma (NHL), is extremely rare during pregnancy. In the case of bowel localization, diagnosis can be very difficult. Moreover, signs and symptoms of the primary small intestine lymphoma are nonspecific, mostly attributable to the "mass effect" of the tumor. The most frequent symptom is abdominal cramp-like pain, associated with nausea and vomiting. PRESENTATION OF CASE: We report a rare case of a 37-year-old pregnant woman, at the 33rd week of gestation, with an abdominal-pelvic mass of uncertain nature. Surgical strategy consisted of a two-step procedure, which involved a cesarean section and typing of the mass: extemporaneous examination hypothesized intestinal lymphoma. The definitive histological examination confirmed the diagnosis of rare case of BL in pregnancy. DISCUSSION: The clinical case reported, representing a rare occurrence of BL in pregnancy, was associated with difficult interpretation and complex management. Lymphoma of the small intestine is often overlooked in the early stages of the disease, due to the fact that symptoms are non-specific and consequently underestimated. In our case, based on gestational age, it was possible to perform a multidisciplinary approach, a cesarean section with surgical intestinal exploration, achieving at the same time delivery of the child and a definitive diagnosis of BL with intestinal involvement. CONCLUSION: The involvement of multiple professionals is undoubtedly the best way to deal with the above referred to situation, with the main point being to keep in mind the possibility of this type of occurrence.

J Mol Histol ; 51(2): 109-115, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-32300923


The salivary glands are key components of the mouth and play a central role in its physiology. Their importance may be appreciated considering their number, occurrence in pairs, and distribution in the mouth: two parotids, two submandibular, two sublingual, and many other small ones scattered throughout the mouth. They produce saliva, without which ingestion of non-liquid nutrients and speech would be practically impossible. Nevertheless, the physiology and pathology of salivary glands are poorly understood. For instance, tumors of salivary glands occur, and their incidence is on the rise, but their etiology and pathogenesis are virtually unknown, although some risk factors have been identified. Likewise, the role of the chaperoning system in the development, normal functioning, and pathology, including carcinogenesis, remains to be determined. This scarcity of basic knowledge impedes progress in diagnosis, disease monitoring, and therapeutics of salivary gland tumors. We are currently involved in examining the chaperoning system of human salivary glands and we performed a search of the literature to determine what has been reported relating to oncology. We found data pertaining to six components of the chaperone system, namely HSP27, HSP60, HSP70, HSP84, HSP86, and GRP78, and to another HSP, the heme-oxygenase H-O1, also named HSP32, which does not belong in the chaperoning system but seemed to have potential as a biomarker for diagnostic purposes as much as the HSP/chaperones mentioned above. The reported quantitative variations of the six chaperones were distinctive enough to distinguish malignant from benign tumors, suggesting that these molecules hold potential as biomarkers useful in differential diagnosis. Also, the quantitative variations described accompanying tumor development, as observed in cancers of other organs, encourages research to elucidate whether chaperones play a role in the initiation and/or progression of salivary gland tumors.

Chaperonas Moleculares/metabolismo , Neoplasias das Glândulas Salivares/etiologia , Neoplasias das Glândulas Salivares/metabolismo , Animais , Transformação Celular Neoplásica/genética , Transformação Celular Neoplásica/metabolismo , Suscetibilidade a Doenças , Humanos , Chaperonas Moleculares/genética , Neoplasias das Glândulas Salivares/epidemiologia , Neoplasias das Glândulas Salivares/patologia
Clin J Gastroenterol ; 13(3): 377-381, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-31728918


JC virus is a member of the Polyomavirus family, infects humans worldwide, and 90% of the population carry antibodies to the virus by adult life. The initial infection is asymptomatic, but it may become persistent. JC virus DNA is frequently present in the upper and lower gastrointestinal tracts of healthy adults. Chronic idiopathic intestinal pseudo-obstruction, one of the most severe gastrointestinal motility disorders, is a condition characterized by a clinical picture mimicking small bowel occlusion with related symptoms and signs in the absence of demonstrable mechanical obstruction. Because of the known neuropathic capability of this virus, and its frequent presence in the gut, it has been proposed that JCV might be detectable in tissues of patients with chronic idiopathic intestinal pseudo-obstruction, and possibly be involved in the pathogenesis of this disease, because the virus may actively infect the enteroglial cells of the myenteric plexuses of the patients with chronic idiopathic intestinal pseudo-obstruction. We report two cases of upper idiopathic intestinal pseudo-obstruction associated with JCV infection.

Duodenopatias/etiologia , Pseudo-Obstrução Intestinal/etiologia , Vírus JC , Infecções por Polyomavirus/complicações , Infecções Tumorais por Vírus/complicações , Duodenopatias/diagnóstico , Duodenopatias/patologia , Duodenopatias/virologia , Duodenoscopia , Feminino , Humanos , Pseudo-Obstrução Intestinal/diagnóstico , Pseudo-Obstrução Intestinal/patologia , Pseudo-Obstrução Intestinal/virologia , Masculino , Pessoa de Meia-Idade , Infecções por Polyomavirus/virologia , Infecções Tumorais por Vírus/virologia