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1.
Ultrastruct Pathol ; : 1-5, 2020 Dec 04.
Artigo em Inglês | MEDLINE | ID: mdl-33274661

RESUMO

COVID-19 (from SARS-CoV-2) is the cause of an ongoing pandemic, with an increasing number of cases and significant mortality worldwide. Clinical trials and extensive studies are being conducted on a large scale for a better understanding of the pathophysiology of this disease and its effect on different organs. Several experimental treatment protocols have been introduced, in which hydroxychloroquine (HCQ) was one of the first drugs used. While patients can develop many side effects of HCQ, studies have documented a rare association of long-term HCQ treatment with zebra-like bodies in the ultrastructural examination of kidney biopsies, a finding typically seen in Fabry's disease, as well as in association with chronic HCQ use, among other drugs. We present a similar finding in the postmortem examination of a male in his early seventies with COVID-19 infection, who received five days of HCQ treatment before stopping the medication due to cardiac and renal toxicity.

2.
Transplantation ; 103(11): 2440-2447, 2019 11.
Artigo em Inglês | MEDLINE | ID: mdl-30830043

RESUMO

BACKGROUND: Antibody-mediated rejection (AMR) plays an important role in allograft dysfunction. Acute lung injury (ALI), endotheliitis, capillary inflammation, and C4d positivity have been described as morphological features conventionally associated with lung AMR. A multidisciplinary, international task force reviewed AMR cases in the context of four face-to-face meetings. Septal widening was a frequent, striking histological feature recognized first and easily at low-power magnification. This study aimed to evaluate whether septal widening could represent an "alert" signal for AMR. METHODS: Following the face-to-face meetings that enabled the classification of cases as AMR or non-AMR, morphometry was performed on biopsies from 48 recipients with definite, probable or possible AMR, 31 controls (negative for any posttransplant injury) and 10 patients with nonimmune-related ALI. RESULTS: Mean alveolar septal thickness was greater in AMR patients than in controls (P < 0.001). Septal thickness was not significantly different between AMR-ALI and non-AMR-ALI. Unexpectedly septal widening was the only histological change detected in some cases with probable or possible AMR that lacked the histological lesions conventionally associated with AMR. The thickness in these cases was similar to that observed in AMR cases with more severe histological injury such as ALI or neutrophilic capillaritis. CONCLUSIONS: Our data suggest that, even if unspecific as the other lesions conventionally associated with AMR, septal widening may represent an "alert" signal to look into lung AMR. A larger prospective study is mandatory to confirm the potential value of septal widening in the multidisciplinary approach of AMR.


Assuntos
Rejeição de Enxerto/diagnóstico , Rejeição de Enxerto/imunologia , Pneumopatias/imunologia , Pneumopatias/cirurgia , Transplante de Pulmão , Pulmão/imunologia , Alvéolos Pulmonares/patologia , Adulto , Biópsia , Feminino , Humanos , Comunicação Interdisciplinar , Pneumopatias/diagnóstico , Masculino , Pessoa de Meia-Idade , Projetos Piloto , Pneumologia/normas , Estudos Retrospectivos , Doadores de Tecidos , Transplante Homólogo
4.
Am J Respir Crit Care Med ; 197(8): 1045-1057, 2018 04 15.
Artigo em Inglês | MEDLINE | ID: mdl-29236513

RESUMO

RATIONALE: Obliterative bronchiolitis (OB) is a major cause of mortality after lung transplantation. Depletion of airway stem cells (SCs) may lead to fibrosis in OB. OBJECTIVES: Two major SC compartments in airways are submucosal glands (SMGs) and surface airway p63 (also known as TP63 [tumor protein 63])-positive/K5 (also known as KRT5 [keratin 5])-positive basal cells (BCs). We hypothesized that depletion of these SC compartments occurs in OB. METHODS: Ferret orthotopic left lung transplants were used as an experimental model of OB, and findings were corroborated in human lung allografts. Morphometric analysis was performed in ferret and human lungs to evaluate the abundance of SMGs and changes in the expression of phenotypic BC markers in control, lymphocytic bronchiolitis, and OB airways. The abundance and proliferative capacity of proximal and distal airway SCs was assessed using a clonogenic colony-forming efficiency assay. MEASUREMENTS AND MAIN RESULTS: Ferret allografts revealed significant loss of SMGs with development of OB. A progressive decline in p63+/K5+ and increase in K5+/K14+ and K14+ BC phenotypes correlated with the severity of allograft rejection in large and small ferret airways. The abundance and proliferative capacity of basal SCs in large allograft airways declined with severity of OB, and there was complete ablation of basal SCs in distal OB airways. Human allografts mirrored phenotypic BC changes observed in the ferret model. CONCLUSIONS: SMGs and basal SC compartments are depleted in large and/or small airways of lung allografts, and basal SC proliferative capacity declines with progression of disease and phenotypic changes. Global airway SC depletion may be a mechanism for pulmonary allograft failure.


Assuntos
Remodelação das Vias Aéreas/fisiologia , Bronquiolite Obliterante/fisiopatologia , Fibrose/fisiopatologia , Rejeição de Enxerto/fisiopatologia , Transplante de Pulmão/efeitos adversos , Células-Tronco/fisiologia , Animais , Bronquiolite Obliterante/etiologia , Furões/fisiologia , Fibrose/etiologia , Humanos , Modelos Animais
5.
Anim Sci J ; 88(11): 1849-1854, 2017 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-28631434

RESUMO

A high viability of probiotics in food product, with a living cells threshold of 107 /cfu/g (colony-forming units/g) is a challenge to achieve in food production. Spray drying is an efficient and economic industrial method for probiotic bacterial preservation and its application in food products. In this study, the survival of free and spray-dried cells of potential probiotic strain Lactobacillus plantarum 564 after production and during 8 weeks of storage of soft acid coagulated goat cheese was investigated, as well as compositional and sensory quality of cheese. Total bacterial count of spray-dried Lb. plantarum 564 cells were maintained at the high level of 8.82 log/cfu/g in cheese after 8 weeks of storage, while free-cell number decreased to 6.9 log/cfu/g. However, the chemical composition, pH values and sensory evaluation between control cheese (C1 sample made with commercial starter culture) and treated cheese samples (C2 and C3, made with the same starter, with the addition of free and spray-dried Lb. plantarum 564 cells, respectively) did not significantly differ. High viability of potential probiotic bacteria and acceptable sensory properties indicate that spray-dried Lb. plantarum 564 strain could be successfully used in the production of soft acid coagulated goat cheeses.


Assuntos
Queijo/microbiologia , Manipulação de Alimentos/métodos , Microbiologia de Alimentos , Qualidade dos Alimentos , Armazenamento de Alimentos , Lactobacillus plantarum/crescimento & desenvolvimento , Probióticos , Animais , Carga Bacteriana , Queijo/análise , Análise de Alimentos , Cabras , Humanos , Lactobacillus plantarum/citologia , Odorantes , Paladar , Fatores de Tempo
6.
Int J Gynecol Pathol ; 33(6): 543-53, 2014 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-25272292

RESUMO

Progestins have been used in the treatment of recurrent endometrial adenocarcinoma for almost 50 yr. Some endometrial carcinomas respond to hormonal therapy, but the mechanism of action remains incompletely known. We wished to determine the efficacy of progestins to induce a histologic response in endometrioid carcinomas and explore its effects on histologic and immunohistochemical measures of growth and cell death. The Gynecologic Oncology Group initiated a study of 75 women with endometrioid endometrial adenocarcinoma, 59 of whom received the progestin, medroxyprogesterone acetate for 21 to 24 d immediately before hysterectomy and had available slides. Initial biopsies and hysterectomies were hematoxylin and eosin-stained and immunostained for estrogen receptor (ER) and progesterone receptor (PR), progesterone receptor-ß (PRB), Bcl-2, Ki-67, and cleaved caspase-3 (Casp3). A histologic response was defined subjectively, following which specific histologic measurements and semiquantitative scores of immunohistologic variables of initial biopsies were compared with posttreatment slides. Only 1 complete histologic response was seen, but 37 tumors (63%) had a partial histologic response. Specific histologic changes included the following: a decrease in the nuclear grade, the number of mitotic figures, nucleoli, and mean gland cellularity, and acquisition of more abundant eosinophilic cytoplasm, squamous metaplasia, and secretion. The tumors that displayed a subjectively defined histologic response following treatment differed initially from those that did not only with respect to initial nuclear grade and the mitotic index. Statistically significant differences in the specific histologic features in carcinomas of responders versus nonresponders following treatment were found only with respect to acquisition of pale eosinophilic cytoplasm and luminal secretion. More than 90% of tumors were initially ER positive and 76% were PR positive. The initial presence of ER or PR was not related to subjective histologic response. PR and PRB were significantly downregulated following progestin therapy, as were Ki-67 and Bcl-2. However, ER and Casp3 did not change significantly. Tumors that displayed a histologic response had significantly lower pretreatment levels of Ki-67. Mean Ki-67 and Bcl-2 decreases following medroxyprogesterone acetate were greater in histologic responders than nonresponders, but not decreases in ER, PR, PRB, and Casp3. The histologic response in the tumors and their stroma differed quantitatively and qualitatively from that of the adjacent benign endometrium, where decidual change accompanied luminal secretion and secretory exhaustion of glands. Three weeks of medroxyprogesterone acetate therapy induces partial histologic responses in most endometrioid adenocarcinomas. Previously suggested features of histologic response do not capture the entire spectrum of changes seen. Downregulation of ER, PR, PRB, Ki-67, and Bcl-2 occurs without a significant change in Casp3. These alterations suggest that progestins act by differentiation of neoplastic cells with diminished proliferation rather than tumor cell death. As stromal decidualization was confined to areas surrounding benign glands, a paracrine effect may be involved in complete response to progestins.


Assuntos
Antineoplásicos Hormonais/uso terapêutico , Carcinoma Endometrioide/tratamento farmacológico , Neoplasias do Endométrio/tratamento farmacológico , Acetato de Medroxiprogesterona/uso terapêutico , Adulto , Idoso , Idoso de 80 Anos ou mais , Biomarcadores Tumorais/análise , Carcinoma Endometrioide/patologia , Neoplasias do Endométrio/patologia , Feminino , Humanos , Imuno-Histoquímica , Pessoa de Meia-Idade
7.
Sci Rep ; 3: 2331, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-23900262

RESUMO

Metastasis-associated protein 1 (MTA1), a negative epigenetic modifier, plays a critical role in prostate cancer (PCa) progression. We hypothesized that MTA1 overexpression in primary tumor tissues can predict PCa aggressiveness and metastasis. Immunohistochemical staining of MTA1 was done on archival PCa specimens from University of Mississippi Medical Center and University of Iowa. We found that nuclear MTA1 overexpression was positively correlated with the severity of disease progression reaching its highest levels in metastatic PCa. Nuclear MTA1 overexpression was significantly associated with Gleason > 7 tumors in African Americans but not in Caucasians. It was also a predictor of recurrent disease. We concluded that MTA1 nuclear overexpression may be a prognostic indicator and a future therapeutic target for aggressive PCa in African American men. Our findings may be useful for categorizing African American patients with a higher probability of recurrent disease and metastasis from those who are likely to remain metastasis-free.


Assuntos
Afro-Americanos/estatística & dados numéricos , Biomarcadores Tumorais/metabolismo , Núcleo Celular/metabolismo , Histona Desacetilases/metabolismo , Recidiva Local de Neoplasia/etnologia , Recidiva Local de Neoplasia/metabolismo , Neoplasias da Próstata , Proteínas Repressoras/metabolismo , Humanos , Iowa/epidemiologia , Masculino , Pessoa de Meia-Idade , Mississippi/epidemiologia , Prevalência , Neoplasias da Próstata/etnologia , Neoplasias da Próstata/metabolismo , Neoplasias da Próstata/secundário , Recidiva , Medição de Risco , Transativadores , Regulação para Cima
8.
Pediatr Dev Pathol ; 14(5): 391-5, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-21682576

RESUMO

Gonadoblastomas are mixed germ cell sex cord-stromal tumors that arise in dysgenetic gonads and are composed of immature germ cells and sex cord-stromal cells of indeterminate differentiation. FOXL2 is one of the first genes expressed in female gonad development, and it is required for proper granulosa cell differentiation during folliculogenesis. SOX9 , a downstream target of SRY , the gene in the Y chromosomal sex-determining region, is required for testicular development and for the formation and maintenance of (pre-)Sertoli cells. This study characterized the sex cord-stromal cells of gonadoblastoma by evaluating the expression of these counteracting transcription factors. Archival paraffin-embedded material of 7 gonadoblastomas, 5 of which were overgrown by dysgerminoma, was examined by immunohistochemistry for expression and localization of FOXL2 and SOX9. The sex cord-stromal cells revealed strong nuclear staining for FOXL2 and were negative for SOX9 expression. Germ cells in the gonadoblastoma and dysgerminoma components showed no FOXL2 and SOX9 expression. Areas of transition between gonadoblastoma and dysgerminoma revealed nests with a gradual reduction of FOXL2 expression. Our results support the hypothesis that the sex cord-stromal cell component of gonadoblastomas is of granulosa cell origin. In addition, FOXL2 appears to be a useful marker for the evaluation of overgrowth by dysgerminomas and for the identification of the transition zone of "dysgerminoma in situ." As FOXL2 and SOX9 are differentially expressed, they also should be useful for distinguishing gonadoblastomas from intratubular germ cell neoplasias and can help to differentiate those with a Sertoli cell component from gonadoblastoma with a granulosa cell component.


Assuntos
Disgerminoma/patologia , Fatores de Transcrição Forkhead/metabolismo , Gonadoblastoma/patologia , Fatores de Transcrição SOX9/metabolismo , Tumores do Estroma Gonadal e dos Cordões Sexuais/patologia , Neoplasias Testiculares/patologia , Adolescente , Biomarcadores Tumorais/metabolismo , Linhagem da Célula , Núcleo Celular/metabolismo , Núcleo Celular/patologia , Pré-Escolar , Disgerminoma/genética , Disgerminoma/metabolismo , Proteína Forkhead Box L2 , Gonadoblastoma/genética , Gonadoblastoma/metabolismo , Humanos , Masculino , Tumores do Estroma Gonadal e dos Cordões Sexuais/metabolismo , Células Estromais/patologia , Neoplasias Testiculares/genética , Neoplasias Testiculares/metabolismo
9.
Prostate ; 71(3): 268-80, 2011 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-20717904

RESUMO

BACKGROUND: Metastasis-associated protein 1 (MTA1) is overexpressed in many forms of cancer types but its role in prostate cancer (PCa) progression and metastasis has not been explored. In this study, we addressed the functional and biological role of MTA1 in PCa. METHODS: Gene expression profiling was used to determine MTA1 overexpression during PCa cell-bone interaction. Immunohistochemistry was used to detect MTA1 on tissue microarrays (TMA) and vascular endothelial growth factor (VEGF), CD31, and Ki67 in xenografts. We used retroviral or lentiviral RNAi transduction of PCa cells to establish MTA1 knockdowns. RT-PCR, Western blot, invasion, and endothelial cell migration assays were used to characterize the cells in vitro. The role of MTA1 in PCa tumorigenesis was evaluated in mouse xenografts. RESULTS: We identified MTA1 as a component of bone metastasis signature in PCa, which suggested a possible role for MTA1 in PCa progression and metastasis. MTA1 was expressed at higher levels in PCa cell lines than in normal prostate epithelial cells. Silencing MTA1 significantly suppressed the invasion and angiogenic activity of the cells in vitro and delayed tumor formation and development in mouse xenografts. Tumors that express MTA1 had higher proliferative indices, secreted higher levels of VEGF and were more vascularized. Analysis of the human TMA showed positive correlation between MTA1 nuclear localization/staining intensity and PCa aggressiveness. CONCLUSIONS: MTA1 pro-angiogenic and pro-invasive functions create permissive environment for PCa tumor growth and likely support metastasis. Taken together with its predictive values, MTA1 can be utilized both as a prognostic marker and a therapy target in PCa.


Assuntos
Histona Desacetilases/fisiologia , Neovascularização Patológica/etiologia , Neoplasias da Próstata/irrigação sanguínea , Proteínas Repressoras/fisiologia , Animais , Linhagem Celular , Histona Desacetilases/análise , Humanos , Masculino , Camundongos , Metástase Neoplásica , Neoplasias , Neovascularização Patológica/prevenção & controle , Neoplasias da Próstata/patologia , Proteínas Repressoras/análise , Proteínas Repressoras/antagonistas & inibidores , Transativadores
10.
Nitric Oxide ; 22(2): 155-67, 2010 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-20005300

RESUMO

Nitrite and nitrate are frequently used surrogate markers of nitric oxide (NO) production. Using rat models of acute and chronic DSS-induced colitis we examined the applicability of these and other NO-related metabolites, in tissues and blood, for the characterization of inflammatory bowel disease. Global NO dynamics were assessed by simultaneous quantification of nitrite, nitrate, nitroso and nitrosyl species over time in multiple compartments. NO metabolite levels were compared to a composite disease activity index (DAI) and contrasted with measurements of platelet aggregability, ascorbate redox status and the effects of 5-aminosalicylic acid (5-ASA). Nitroso products in the colon and in other organs responded in a manner consistent with the DAI. In contrast, nitrite and nitrate, in both intra- and extravascular compartments, exhibited variations that were not always in step with the DAI. Extravascular nitrite, in particular, demonstrated significant temporal instabilities, ranging from systemic drops to marked increases. The latter was particularly evident after cessation of the inflammatory stimulus and accompanied by profound ascorbate oxidation. Treatment with 5-ASA effectively reversed these fluctuations and the associated oxidative and nitrosative stress. Platelet activation was enhanced in both the acute and chronic model. Our results offer a first glimpse into the systemic nature of DSS-induced inflammation and reveal a greater complexity of NO metabolism than previously envisioned, with a clear dissociation of nitrite from other markers of NO production. The remarkable effectiveness of 5-ASA to abrogate the observed pattern of nitrite instability suggests a hitherto unrecognized role of this molecule in either development or resolution of inflammation. Its possible link to tissue oxygen consumption and the hypoxia that tends to accompany the inflammatory process warrants further investigation.


Assuntos
Doenças Inflamatórias Intestinais/metabolismo , Nitratos/metabolismo , Óxido Nítrico/biossíntese , Nitritos/metabolismo , Animais , Biomarcadores/metabolismo , Modelos Animais de Doenças , Masculino , Mesalamina/metabolismo , Ratos , Ratos Wistar
11.
Cancer ; 117(3): 195-202, 2009 Jun 25.
Artigo em Inglês | MEDLINE | ID: mdl-19382174

RESUMO

BACKGROUND: To date, thyroid fine-needle aspiration (FNA) has been used by clinicians as the screening test of choice to determine whether surgery is required and this is what the pathology report should communicate. Standard terminology for reporting thyroid FNA has not been implemented yet, and pathologists have used various reporting systems to communicate results. A significant source of confusion among both pathologists and clinicians has been the use of the indeterminate category. On the basis of an analysis of 1150 thyroid FNAs in 2000, this institution modified the reporting of thyroid biopsy results into 6 categories, including unsatisfactory. The indeterminate category was separated into 3 subroups: 1) indeterminate for neoplasia (IND), 2) follicular neoplasm (FN), and 3) suspicious for malignancy (SUSP). Repeat FNA in 6 months to 12 months was recommended for IND and surgery for FN and SUSP categories. METHODS: To determine the validity of this approach, the outcomes of this reporting system from July of 2000 to December of 2006 were analyzed. The IND category was used for 2 subsets of cases: (a) those that morphologically fall into the gray zone between adenomatoid nodule (AN) and FN, for Hurthle cell nodule (hyperplasia vs neoplasm), and chronic lymphocytic thyroiditis with concern for neoplasia; and (b) for suboptimal specimens due to low epithelial cellularity or collection artifacts. RESULTS: Among 5194 thyroid nodules, the IND category comprised 18%. FNA follow-up was done in 21% of IND cases: 58% were benign/negative and did not require surgery based on cytology alone. Surgical follow-up in 46% of IND showed 52% were benign/negative, and 42% were follicular/Hurthle cell adenomas. The surgical yield of malignancy in IND was low (6%) when compared with the FN category, which was 14% (more than 2x that of the IND category), and the SUSP category, which was 53% (almost 9x that of the IND category). CONCLUSIONS: A 6-tier reporting system for thyroid FNA was effective for determining which patients needed surgery versus follow-up FNA and also guided the clinician on the extent of surgery.


Assuntos
Biópsia por Agulha Fina/métodos , Glândula Tireoide/patologia , Neoplasias da Glândula Tireoide/classificação , Neoplasias da Glândula Tireoide/patologia , Seguimentos , Humanos , Avaliação de Resultados em Cuidados de Saúde , Terminologia como Assunto , Glândula Tireoide/cirurgia , Neoplasias da Glândula Tireoide/cirurgia
12.
Cancer ; 114(6): 512-8, 2008 Dec 25.
Artigo em Inglês | MEDLINE | ID: mdl-18988285

RESUMO

BACKGROUND: Fine-needle aspiration (FNA) is widely accepted as the initial test to evaluate thyroid nodules; however, inadequate and suboptimal specimens have been 1 of its limitations. Unsatisfactory rates of 4.1% to 43% have been reported, but suboptimal specimens with adequate epithelial cells and other limiting factors, such as clotting, often are not addressed. The authors' institution has a low unsatisfactory rate, especially for thyroid biopsies performed under ultrasound in the Interventional Radiology (IR) Department. In addition to on-site evaluation for all cases, they concomitantly use thin, 22/20-gauge core needle biopsy (CB) crush preparations (CP) for unsatisfactory/suboptimal FNAs. The CB usually is done after 2 FNA passes and, in most cases, is exhausted by making an air-dried CP, which is evaluated on site for adequacy; any residual tissue is processed for tissue sections. Experience is required to interpret CP on air-dried smears. In this report, the authors describe a complementary approach to thyroid biopsy that has worked well. METHODS: All thyroid FNA and CB/CP that were performed in the IR Department during the year 2005 were reviewed. Follow-up histology and records of all procedural complications were retrieved. RESULTS: Seven hundred thirteen thyroid biopsies qualified, 225 biopsies (31%) had FNA with CB/CP (85% had only CP for evaluation), and 488 biopsies (69%) had only FNA. The final unsatisfactory rate in IR for FNA was 8.7%; this was reduced to 3.4% with the use of CB/CP. The addition of CB also helped to obtain a more definitive diagnosis in suboptimal FNA specimens. Cytologic-histologic correlation was comparable for FNA only cases and FNA/CB cases. There were no significant procedural complications in CB cases. CONCLUSIONS: FNA in conjunction with a thin CB/CP performed during the same procedure is a safe technique that can reduce the rate of unsatisfactory and suboptimal thyroid biopsy.


Assuntos
Biópsia por Agulha/métodos , Glândula Tireoide/patologia , Nódulo da Glândula Tireoide/patologia , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade
13.
FEBS J ; 274(24): 6365-77, 2007 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-18021253

RESUMO

Angiogenic switch in renal cell carcinoma (RCC) is attributed to the inactivation of the von Hippel-Lindau tumor suppressor, stabilization of hypoxia inducible factor-1 transcription factor and increased vascular endothelial growth factor. To evaluate the role of an angiogenesis inhibitor, thrombopsondin-1 (TSP1), we compared TSP1 production in human RCC and normal tissue and secretion by the normal renal epithelium (human normal kidney, HNK) and RCC cells. Normal and RCC tissues stained positive for TSP1, and the levels of TSP1 mRNA and total protein were similar in RCC and HNK cells. However, HNK cells secreted high TSP1, which rendered them nonangiogenic, whereas RCC cells secreted little TSP1 and were angiogenic. Western blot and immunostaining revealed TSP1 in the cytoplasm of RCC cells on serum withdrawal, whereas, in HNK cells, it was rapidly exported. Seeking mechanisms of defective TSP1 secretion, we discovered impaired calcium uptake by RCC in response to vascular endothelial growth factor. In HNK cells, 1,2-bis(o-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid acetoxymethyl ester, a calcium chelator, simulated TSP1 retention, mimicking the RCC phenotype. Further analysis revealed a profound decrease in transient receptor potential canonical ion channel 4 (TRPC4) Ca(2+) channel expression in RCC cells. TRPC4 silencing in HNK cells caused TSP1 retention and impaired secretion. Double labeling of the secretory system components revealed TSP1 colocalization with coatomer protein II (COPII) anterograde vesicles in HNK cells. In contrast, in RCC cells, TSP1 colocalized with COPI vesicles, pointing to the retrograde transport to the endoplasmic reticulum caused by misfolding. Our study indicates that TRPC4 loss in RCC leads to impaired Ca(2+) intake, misfolding, retrograde transport and diminished secretion of antiangiogenic TSP1, thus enabling angiogenic switch during RCC progression.


Assuntos
Carcinoma de Células Renais/irrigação sanguínea , Neoplasias Renais/irrigação sanguínea , Neovascularização Patológica/patologia , Trombospondina 1/metabolismo , Animais , Western Blotting , Vesículas Revestidas pelo Complexo de Proteína do Envoltório/efeitos dos fármacos , Vesículas Revestidas pelo Complexo de Proteína do Envoltório/metabolismo , Cálcio/metabolismo , Cálcio/farmacocinética , Carcinoma de Células Renais/patologia , Linhagem Celular , Linhagem Celular Tumoral , Proliferação de Células , Quelantes/farmacologia , Neovascularização da Córnea/genética , Neovascularização da Córnea/metabolismo , Neovascularização da Córnea/patologia , Ácido Egtázico/análogos & derivados , Ácido Egtázico/farmacologia , Feminino , Imunofluorescência , Humanos , Imuno-Histoquímica , Neoplasias Renais/patologia , Camundongos , Camundongos Endogâmicos C57BL , Neovascularização Patológica/genética , Neovascularização Patológica/metabolismo , Ratos , Ratos Endogâmicos F344 , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Canais de Cátion TRPC/genética , Canais de Cátion TRPC/metabolismo , Trombospondina 1/genética , Transfecção
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