27 research outputs found

    Pathophysiology of Endocrine Exophthalmos

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    La fisiopatolog铆a del exoftalmos endocrino ha ido evolucionando a lo largo del tiempo. En primer lugar fue necesario que los trabajos originales de Graves y de Basedow asociaran la alteraci贸n ocular con la disfunci贸n tiroidea. Estudios complementarios demostraron que el exoftalmos tambi茅n se puede observar en pacientes con Tiroiditis de Hashimoto. Estudios posteriores han demostrado la presencia de una sustancia o factor al que denominaron Factor exoftalmizante en el suero de pacientes. La demostraci贸n experimental de que se pod铆a producir exoftalmos por un mecanismo autoinmune y la demostraci贸n de la presencia de un estimulador tiroideo de acci贸n prolongada (LATS) llev贸 al concepto actual acerca de la participaci贸n de un mecanismo inmunol贸gico en la fisipatolog铆a de esta afecci贸n.The pathophysiology of endocrine exophthalmos has changed with the advances of Medicine. Described for the first time associated with hyperthyroidism by Graves and von Basedow, further studies demonstrated that it also may occur in patients with autoimmune thyroiditis. It is caused by the increase of retro ocular tissue volume. An exophthalmos producing substance (EPS) was found in the serum of those patients. The experimental demonstration that exophthalmos may be prduced by an autoimmune mechanism, and the finding that a circulating immunoglobulin, the Long Acting Thyroid Stimulator (LATS) is the cause of Graves disease, led to the present concept on the pathogrenesis of this disease The authors do not have conflicts of interest.Fil: Pisarev, Mario Alberto. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia de Area de Aplicaciones de la Tecnolog铆a Nuclear. Gerencia de Radiobiolog铆a (Centro At贸mico Constituyentes); Argentina. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioqu铆mica Humana; Argentin

    Pathophysiology of Endocrine Exophthalmos

    Get PDF
    La fisiopatolog铆a del exoftalmos endocrino ha ido evolucionando a lo largo del tiempo. En primer lugar fue necesario que los trabajos originales de Graves y de Basedow asociaran la alteraci贸n ocular con la disfunci贸n tiroidea. Estudios complementarios demostraron que el exoftalmos tambi茅n se puede observar en pacientes con Tiroiditis de Hashimoto. Estudios posteriores han demostrado la presencia de una sustancia o factor al que denominaron Factor exoftalmizante en el suero de pacientes. La demostraci贸n experimental de que se pod铆a producir exoftalmos por un mecanismo autoinmune y la demostraci贸n de la presencia de un estimulador tiroideo de acci贸n prolongada (LATS) llev贸 al concepto actual acerca de la participaci贸n de un mecanismo inmunol贸gico en la fisipatolog铆a de esta afecci贸n.The pathophysiology of endocrine exophthalmos has changed with the advances of Medicine. Described for the first time associated with hyperthyroidism by Graves and von Basedow, further studies demonstrated that it also may occur in patients with autoimmune thyroiditis. It is caused by the increase of retro ocular tissue volume. An exophthalmos producing substance (EPS) was found in the serum of those patients. The experimental demonstration that exophthalmos may be prduced by an autoimmune mechanism, and the finding that a circulating immunoglobulin, the Long Acting Thyroid Stimulator (LATS) is the cause of Graves disease, led to the present concept on the pathogrenesis of this disease The authors do not have conflicts of interest.Fil: Pisarev, Mario Alberto. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia de Area de Aplicaciones de la Tecnolog铆a Nuclear. Gerencia de Radiobiolog铆a (Centro At贸mico Constituyentes); Argentina. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioqu铆mica Humana; Argentin

    Study of 6-propyl-2-thiouracil as a radioprotector for the thyroid gland

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    The objective of the paper was to study the application of 6-propyl-2-thiouracil (PTU) as a radioprotector for the thyroid gland. Rat thyroid epithelial cells (FRTL-5) and human colon cancer cells (ARO81-1) were exposed to 纬-irradiation with or without 1 mM PTU. Radiation response was analysed by clonogenic survival assay. Cyclic AMP levels were measured by Radioimmunoassay (RIA). The results showed that PTU increased the Surviving Cell Fraction (SF) at 2 Gy significantly (p < 0.05) in both cell lines. PTU increased extracellular levels of cAMP in all the treatments in a dose- and time-dependent manner for FRTL-5 cells. In ARO81-1 cells, a peak was observed at 24 hours in extracellular levels incubated with 1 mM PTU (36.97 卤 6.74 fmol/渭g prot vs. control: 17.53 卤 3.9 fmol/渭g prot, p < 0.001). Forskolin and dibutyril cAMP mimicked the effect of PTU on SF. Thus PTU appears to be a radioprotector for thyroid cells and could exert its effect through cAMP.Fil: Perona, Marina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia de Area de Aplicaciones de la Tecnolog铆a Nuclear. Gerencia de Radiobiolog铆a (Centro At贸mico Constituyentes); ArgentinaFil: Dagrosa, Mar铆a Alejandra. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia de Area de Aplicaciones de la Tecnolog铆a Nuclear. Gerencia de Radiobiolog铆a (Centro At贸mico Constituyentes); ArgentinaFil: Pagotto, Romina. Fundaci贸n de Instituto de Biolog铆a y Medicina Experimental; ArgentinaFil: Casal, Mariana. Comisi贸n Nacional de Energ铆a At贸mica. Centro At贸mico Constituyentes; Argentina. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Oncolog铆a "脕ngel H. Roffo"; ArgentinaFil: Pignataro, Omar Pedro. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Instituto de Biolog铆a y Medicina Experimental. Fundaci贸n de Instituto de Biolog铆a y Medicina Experimental. Instituto de Biolog铆a y Medicina Experimental; ArgentinaFil: Pisarev, Mario Alberto. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Centro At贸mico Constituyentes; Argentina. Universidad de Buenos Aires. Facultad de Medicina. Instituto de Oncolog铆a "脕ngel H. Roffo"; ArgentinaFil: Juvenal, Guillermo Juan. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Centro At贸mico Constituyentes; Argentin

    Participation of NADPH 4 oxidase in thyroid regulation

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    Different factors are involved in thyroid function and proliferation such as thyrotropin (TSH), insulin, growth factors, iodide, etc. TSH and IGF1/insulin increase proliferation rate and stimulate genes involved in thyroid differentiation. In the present study, we analyse the physiological regulation of NOX4 expression by TSH, insulin and iodine, and the role of NOX4 on thyroid genes expression. Differentiated rat thyroid cells (FRTL-5) were incubated in the presence or absence of TSH/insulin and TTF2, PAX8, TPO, NIS, NOX4, TGF尾1, FOXO1/3 mRNA levels were examined by Real Time PCR. We showed that TSH and insulin repress NOX4 expression and appears to be inversely correlated with some thyroid genes. SiRNA targeted knockdown of NOX4 increased mRNA levels of TGF尾1, TPO, PAX8, TTF2, FOXO1 and FOXO3. A PI3K inhibitor (LY294002), increases the expression of NIS, TTF2 and FOXO1/3, however PI3K/AKT pathway does not regulate NOX4 expression. We observed that iodine increased NOX4 expression and knockdown of NOX4 reduced ROS and reversed the inhibitory effect of iodine on NIS, TPO, PAX8 and TTF2 expression. Our findings provide strong evidence that NOX4 could be a novel signaling modulator of TSH/insulin pathway and would have a critical role in the autoregulatory mechanism induced by iodine.Fil: Oglio, Romina. Comisi贸n Nacional de Energ铆a At贸mica; ArgentinaFil: Salvarredi, Leonardo Andres. Comisi贸n Nacional de Energ铆a At贸mica; Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; ArgentinaFil: Rossich, Luciano Esteban. Comisi贸n Nacional de Energ铆a At贸mica; Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; ArgentinaFil: Copelli, Silvia Beatriz. Universidad Centro de Altos Estudios en Ciencias Exactas; ArgentinaFil: Pisarev, Mario Alberto. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica; Argentina. Universidad de Buenos Aires. Facultad de Medicina; ArgentinaFil: Juvenal, Guillermo Juan. Comisi贸n Nacional de Energ铆a At贸mica; Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; ArgentinaFil: Thomasz, Lisa. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica; Argentin

    Studies for the application of boron neutron capture therapy to the treatment of differentiated thyroid cancer

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    The aim of these studies was to evaluate the possibility of treating differentiated thyroid cancer by BNCT. These carcinomas are well controlled with surgery followed by therapy with 131I; however, some patients do not respond to this treatment. BPA uptake was analyzed both in vitro and in nude mice implanted with cell lines of differentiated thyroid carcinoma. The boron intracellular concentration in the different cell lines and the biodistribution studies showed the selectivity of the BPA uptake by this kind of tumor.Fil: Dagrosa, Mar铆a Alejandra. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica; ArgentinaFil: Carpano, Marina. Comisi贸n Nacional de Energ铆a At贸mica; ArgentinaFil: Perona, Marina. Comisi贸n Nacional de Energ铆a At贸mica; Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; ArgentinaFil: Thomasz, Lisa. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica; ArgentinaFil: Nievas, S.. Comisi贸n Nacional de Energ铆a At贸mica; ArgentinaFil: Cabrini, R.. Comisi贸n Nacional de Energ铆a At贸mica; ArgentinaFil: Juvenal, Guillermo Juan. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica; ArgentinaFil: Pisarev, Mario Alberto. Comisi贸n Nacional de Energ铆a At贸mica; Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentin

    Thyroid: Iodine Beyond the Thyronines

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    Although thyroid gland function is mainly under the control of pituitary TSH, other factors may also play a role in this process. Iodine is not used only by the thyroid to synthesize thyroid hormones but also directly influences a number of parameters such as thyroid proliferation and function. Thyroid autoregulation has been related to intraglandular content of an unknown putative iodocompound. The thyroid is capable of producing different iodolipids such as 6-iododeltalactone (IL ) and 2-iodohexadecanal (2-IHDA). Data from different laboratories have shown that these iodolipids can inhibit several thyroid parameters suggesting that these compounds may be the intermediates in the thyroid autoregulation process.Fil: Juvenal, Guillermo Juan. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia de 脕rea de Aplicaciones de la Tecnolog铆a Nuclear. Divisi贸n Bioqu铆mica Nuclear; ArgentinaFil: Thomasz, Lisa. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia de 脕rea de Aplicaciones de la Tecnolog铆a Nuclear. Divisi贸n Bioqu铆mica Nuclear; ArgentinaFil: Oglio, Andrea Romina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia de 脕rea de Aplicaciones de la Tecnolog铆a Nuclear. Divisi贸n Bioqu铆mica Nuclear; ArgentinaFil: Perona, Marina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia de 脕rea de Aplicaciones de la Tecnolog铆a Nuclear. Divisi贸n Bioqu铆mica Nuclear; ArgentinaFil: Pisarev, Mario Alberto. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia de 脕rea de Aplicaciones de la Tecnolog铆a Nuclear. Divisi贸n Bioqu铆mica Nuclear; ArgentinaFil: Rossich, Luciano Esteban. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia de 脕rea de Aplicaciones de la Tecnolog铆a Nuclear. Divisi贸n Bioqu铆mica Nuclear; ArgentinaFil: Salvarredi, Leonardo Andres. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia de 脕rea de Aplicaciones de la Tecnolog铆a Nuclear. Divisi贸n Bioqu铆mica Nuclear; Argentin

    Experimental studies of boronophenylalanine (10BPA) biodistribution for the individually tailored application of boron neutron capture therapy (BNCT) for malignant melanoma treatment

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    Purpose: Patients with the same histopathologic diagnosis of cutaneous melanoma treated with identical protocols of boron neutron capture therapy (BNCT) have shown different clinical outcomes. The objective of the present studies was to evaluate the biodistribution of boronophenilalanina (10BPA) for the potential application of BNCT for the treatment of melanoma on an individual basis. Methods and Materials: The boronophenilalanine (BPA) uptake was evaluated in 3 human melanoma cell lines: MEL-J, A375, and M8. NIH nude mice were implanted with 4 106 MEL-J cells, and biodistribution studies of BPA (350 mg/kg intraperitoneally) were performed. Static infrared imaging using a specially modified infrared camera adapted to measure the body infrared radiance of small animals was used. Proliferation marker, Ki-67, and endothelial marker, CD31, were analyzed in tumor samples. Results: The in vitro studies demonstrated different patterns of BPA uptake for each analyzed cell line (P<.001 for MEL-J and A375 vs M8 cells). The in vivo studies showed a maximum average boron concentration of 25.9 2.6 mg/g in tumor, with individual values ranging between 11.7 and 52.0 mg/g of 10B 2 hours after the injection of BPA. Tumor temperature always decreased as the tumors increased in size, with values ranging between 37C and 23C. A significant correlation between tumor temperature and tumor-to-blood boron concentration ratio was found (R2 Z 0.7, rational function fit). The immunohistochemical studies revealed, in tumors with extensive areas of viability, a high number of positive cells for Ki-67, blood vessels of large diameter evidenced by the marker CD31, and a direct logistic correlation between proliferative status and boron concentration difference between tumor and blood (R2 Z 0.81, logistic function fit). Conclusion: We propose that these methods could be suitable for designing new screening protocols applied before melanoma BNCT treatment for each individual patient and lesion.Fil: Carpano, Marina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia de Area de Aplicaciones de la Tecnolog铆a Nuclear. Gerencia de Radiobiolog铆a (Centro At贸mico Constituyentes); ArgentinaFil: Perona, Marina. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia de Area de Aplicaciones de la Tecnolog铆a Nuclear. Gerencia de Radiobiolog铆a (Centro At贸mico Constituyentes); Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; ArgentinaFil: Rodr铆guez, Carla Beatriz. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia de Area de Aplicaciones de la Tecnolog铆a Nuclear. Gerencia de Radiobiolog铆a (Centro At贸mico Constituyentes); ArgentinaFil: Nievas, Susana Isabel. Comisi贸n Nacional de Energ铆a At贸mica; ArgentinaFil: Olivera, Mar铆a. Comisi贸n Nacional de Energ铆a At贸mica; ArgentinaFil: Santa Cruz, Gustavo Alberto. Comisi贸n Nacional de Energ铆a At贸mica; ArgentinaFil: Brandizzi, Daniel. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia de Area de Aplicaciones de la Tecnolog铆a Nuclear. Gerencia de Radiobiolog铆a (Centro At贸mico Constituyentes); ArgentinaFil: Cabrini, Romulo Luis. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia de Area de Aplicaciones de la Tecnolog铆a Nuclear. Gerencia de Radiobiolog铆a (Centro At贸mico Constituyentes); ArgentinaFil: Pisarev, Mario Alberto. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia de Area de Aplicaciones de la Tecnolog铆a Nuclear. Gerencia de Radiobiolog铆a (Centro At贸mico Constituyentes); Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; ArgentinaFil: Juvenal, Guillermo Juan. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia de Area de Aplicaciones de la Tecnolog铆a Nuclear. Gerencia de Radiobiolog铆a (Centro At贸mico Constituyentes); Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; ArgentinaFil: Dagrosa, Mar铆a Alejandra. Comisi贸n Nacional de Energ铆a At贸mica. Gerencia de Area de Aplicaciones de la Tecnolog铆a Nuclear. Gerencia de Radiobiolog铆a (Centro At贸mico Constituyentes); Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentin

    Experimental studies for the personalized application of boron neutron capture therapy to the treatment of cutaneous melanoma

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    Background: Boron neutron capture therapy (BNCT) is a binary modality based on the nuclear reaction 10B (n, 伪) lithium-7 (7Li) that has been used to treat a variety of tumors, among these, cutaneous melanoma (CM). In previous boron biodistribution studies in agreement with the personalized oncology, we have demonstrated that boronophenylalanine (BPA) uptake can be correlated with the tumoral temperature and viability. The main aim of these studies was to evaluate the relationship between tumoral temperature and the response to the complete BNCT. Methods: Nude mice were implanted with human melanoma cells (Mel J) and divided into different groups (Control, NCT, BNCT I and BNCT II) and irradiated with the thermal neutron beam from RA-6 (4.96脳 108/cm2/sec) during 37 and 55 minutes respectively. Tumor and body temperatures were measured by Static Infrared Imaging (SIRI), and it was performed the following up of the animals. Results: Tumor growth showed a complete growth inhibition during the first 20 days after treatment in both BNCT groups (BNCT I and BNCT II vs. Control P<0.001). Considering the analogy between the Fourier's Law of Heat Conduction and the Ohm's law of Electrical Conduction, the quantity (T_tum-T_ inf)/(T_body-T_tum) was analyzed as a function of Vf/Vi (Final volume/Initial volume) ratio. A tendency to higher values of the temperature's ratios, was observed with respect to the degree of tumor control (BNCT I with a R2 of 0.3527, BNCTII with a R2 of 0.3327) in agreement with previous boron biodistribution studies. The histology and immunohistochemical studies showed larger areas of necrosis and picnotic regions and a significant decrease of the Ki-67 antibody labeling in the BNCT II group evidencing important tumor damage. Conclusions: tumoral characteristics, especially the temperature, could be used to plan a personalized treatment for each patient. As values of correlation between temperature and tumoral response showed to be weak, we considered to explore a new model of three dimension for heat transport process.Fil: Carpano, Marina. Comisi贸n Nacional de Energ铆a At贸mica; ArgentinaFil: Santa Cruz, Gustavo Alberto. Comisi贸n Nacional de Energ铆a At贸mica; ArgentinaFil: Rodriguez, Carla. Comisi贸n Nacional de Energ铆a At贸mica; ArgentinaFil: Nievas, Susana Isabel. Comisi贸n Nacional de Energ铆a At贸mica; ArgentinaFil: Olivera, Mar铆a Silvina. Comisi贸n Nacional de Energ铆a At贸mica; ArgentinaFil: Perona, Marina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica; ArgentinaFil: Boggio, Esteban Fabi谩n. Comisi贸n Nacional de Energ铆a At贸mica; ArgentinaFil: Longhino, Juan Manuel. Comisi贸n Nacional de Energ铆a At贸mica; ArgentinaFil: Pisarev, Mario Alberto. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentina. Comisi贸n Nacional de Energ铆a At贸mica; ArgentinaFil: Juvenal, Guillermo Juan. Comisi贸n Nacional de Energ铆a At贸mica; Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; ArgentinaFil: Dagrosa, Mar铆a Alejandra. Comisi贸n Nacional de Energ铆a At贸mica; Argentina. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas; Argentin

    The role of reduced glutathione in thyroglobulin proteolysis in vitro

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    SCOPUS: ar.jinfo:eu-repo/semantics/publishe

    Action of TSH on nuclear ADP-ribosylation in dog thyroid slices

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    SCOPUS: ar.jinfo:eu-repo/semantics/publishe
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