Role of nuclear factor kappa B and reactive oxygen species in the tumor necrosis factor-a-induced epithelial-mesenchymal transition of MCF-7 cells

The microenvironment of the tumor plays an important role in facilitating cancer progression and activating dormant cancer cells. Most tumors are infiltrated with inflammatory cells which secrete cytokines such as tumor necrosis factor-a (TNF-a). To evaluate the role of TNF-a in the development of cancer we studied its effects on cell migration with a migration assay. The migrating cell number in TNF-a -treated group is about 2-fold of that of the control group. Accordingly, the expression of E-cadherin was decreased and the expression of vimentin was increased upon TNF-a treatment. These results showed that TNF-a can promote epithelial-mesenchymal transition (EMT) of MCF-7 cells. Further, we found that the expression of Snail, an important transcription factor in EMT, was increased in this process, which is inhibited by the nuclear factor kappa B (NFkB) inhibitor aspirin while not affected by the reactive oxygen species (ROS) scavenger N-acetyl cysteine. Consistently, specific inhibition of NFkB by the mutant IkBa also blocked the TNF-a-induced upregulation of Snail promoter activity. Thus, the activation of NFkB, which causes an increase in the expression of the transcription factor Snail is essential in the TNF-a-induced EMT. ROS caused by TNF-a seemed to play a minor role in the TNF-a-induced EMT of MCF-7 cells, though ROS per se can promote EMT. These findings suggest that different mechanisms might be responsible for TNF-a - and ROS-induced EMT, indicating the need for different strategies for the prevention of tumor metastasis induced by different stimuli.

1.° Martyrologium Usuardi. — 2.° Cantus quidam in laudem B. Virginis, cum notis musicis. — 3.° Regula sancti Benedicti. — 4.° Lectiones ex evangeliis depromptae : non pauca desiderantur. — 5.° Redditus, sive conquesta facta per Abbatem Hysimbertum. — 6.° Necrologium monasterii S. Martialis Lemovicensis. — 7.° Catalogus librorum.

Sancti Martialis Lemovicensis

1.° Vita B. Christinae, Spoletanae : authore Ambrosio de Cora, ordinis Fratrum Eremitarum sancti Augustini : ad calcem subjectae Aurelii de Sublaco et Petri Veronensis ad eamdem epistolae. — 2.° Ejusdem Ambrosii de Cora epistola ad Benedictum de Anania. — 3.° Ejusdem oratio de lectoriae gradu. — 4.° Ejusdem principium in legendam astrologiam. — 5.° Ejusdem oratio de Sacerdotum vita. — 6.° Ejusdem orationes duae de laudibus theologiae. — 7.° Ejusdem ad Paulum II. summum Pontificem oratio de laudibus Joannis Evangelistae, et de vitae contemplativae celsitudine. — 8.° Ejusdem oratio de laudibus S. Augustini. — 9.° Ejusdem oratio de sapientia et scientia Christi. — 10.° Ejusdem oratio de eligendo novo Generali, Bononiae anno 1470. habita. — 11.° Ejusdem oratio de pace. — 12.° Ejusdem oratio in illud : Erat Jesus ejiciens daemonium.

Mazarinaeus

Manual de los confesores compuesto: 1° del sacerdote santificado por la administración caritativa y discreta del sacramento de la penitencia: 2° De la práctica de los confesores, de S. Alfonso Ligorio: 3° De las advertencias a los confesores y del tratado de la confesión general de B. Leonardo de Puerto Mauricio: 4° De las instrucciones de S.Carlos Borromeo a los confesores: 5° De los avisos de S. Francisco de Sales a los confesores: 6° De los consejos de S. Felipe Neri: 7° De los avisos de S. Francisco Javier a los confesores

UANL

Indirect study of (11)B(p,alpha(0))(8)Be and (10)B(p,alpha)(7)Be reactions at astrophysical energies by means of the Trojan Horse Method: recent results

Nuclear (p,alpha) reactions destroying the so-called ""light-elements"" lithium, beryllium and boron have been largely studied in the past mainly because their role in understanding some astrophysical phenomena, i.e. mixing-phenomena occurring in young F-G stars [1]. Such mechanisms transport the surface material down to the region close to the nuclear destruction zone, where typical temperatures of the order of similar to 10(6) K are reached. The corresponding Gamow energy E(0)=1.22 (Z(x)(2)Z(X)(2)T(6)(2))(1/3) [2] is about similar to 10 keV if one considers the ""boron-case"" and replaces in the previous formula Z(x) = 1, Z(X) = 5 and T(6) = 5. Direct measurements of the two (11)B(p,alpha(0))(8)Be and (10)B(p,alpha)(7)Be reactions in correspondence of this energy region are difficult to perform mainly because the combined effects of Coulomb barrier penetrability and electron screening [3]. The indirect method of the Trojan Horse (THM) [4-6] allows one to extract the two-body reaction cross section of interest for astrophysics without the extrapolation-procedures. Due to the THM formalism, the extracted indirect data have to be normalized to the available direct ones at higher energies thus implying that the method is a complementary tool in solving some still open questions for both nuclear and astrophysical issues [7-12].

B lineage acute lymphoblastic leukemia transformation in a child with juvenile myelomonocytic leukemia, type 1 neurofibromatosis and monosomy of chromosome 7 - Possible implications in the leukemogenesis

This report describes the case of an 8-month-old infant with a diagnosis of juvenile myelomonocytic leukemia (JMML) and type I neurofibromatosis that presented progression to B lineage acute lymphoid leukemia (ALL). The same rearrangement of gene T-cell receptor gamma (TCRgamma) was detected upon diagnosis of JMML and ALL, suggesting that both neoplasias may have evolved from the same clone. Our results support the theory that JMML may derive from pluripotential cells and that the occurrence of monosomy of chromosome 7 within a clone of cells having an aberrant neurofibromatosis type 1 (NFI) gene may be the cause of JMML and acute leukemia. (C) 2002 Elsevier B.V. Ltd. All rights reserved.

Measurement of the Lambda(b) cross section and the (Lambda)over-bar(b) to Lambda(b) ratio with J/psi Lambda decays in pp collisions at root s=7 TeV CMS Collaboration

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)