Unusual Relationship between Iron Deprivation and Organophosphate Hydrolase Expression.

Organophosphate hydrolases (OPH), hitherto known to hydrolyze the third ester bond of organophosphate (OP) insecticides and nerve agents, have recently been shown to interact with outer membrane transport components, namely, TonB and ExbB/ExbD. In an OPH negative background, Sphingopyxis wildii cells failed to transport ferric enterobactin and showed retarded growth under iron-limiting conditions. We now show the OPH-encoding organophosphate degradation () gene from Sphingobium fuliginis ATCC 27551 to be part of the iron regulon.

Estimation of malignant transformation rate in cases of oral epithelial dysplasia and lichen planus using immunohistochemical expression of Ki-67, p53, BCL-2, and BAX markers.

Background: The issue of a possible malignant transformation in the lesions like epithelial dysplasia and oral lichen planus (OLP) is a matter of serious controversy. The purpose of this study was to suggest the malignant transformation rate in OLP and oral epithelial dysplasia (OED) by using immunohistochemical expression of the tumor markers Ki-67, p53, BCL-2, and BAX.

Materials And Methods: This was a cross-sectional study carried out among 70 samples, including 10 samples from normal healthy mucosa categorized into Group 1, Group 2 (30 OLP), and Group 3 (30 OED) samples.

Aggressive extranodal peripheral T-cell non-Hodgkin's lymphoma: A rare case report and review.

Non-Hodgkin's lymphoma (NHL) is primarily a disorder of lymph nodes, when limited primarily to extranodal sites it is referred to as primary extranodal lymphoma and accounts for 24-48% of all cases of NHL. The development of peripheral T-cell lymphoma is poorly understood and is thought to be associated with effector T cells involving chromosomal translocations. It has been suggested by few authors that the continued increased risk for NHL among highly active antiretroviral therapy (HAART)-treated human immunodeficiency virus (HIV)-infected persons may be a reflection of incomplete immune reconstitution and possibly a chronic state of B-cell hyperactivation.