Cytotoxic and antiproliferative effect of tepary bean lectins on C33-A, MCF-7, SKNSH, and SW480 cell lines.

For many years, several studies have been employing lectin from vegetables in order to prove its toxic effect on various cell lines. In this work, we analyzed the cytotoxic, antiproliferative, and post-incubatory effect of pure tepary bean lectins on four lines of malignant cells: C33-A; MCF-7; SKNSH, and SW480. The tests were carried out employing MTT and 3[H]-thymidine assays.

The frpB1 gene of Helicobacter pylori is regulated by iron and encodes a membrane protein capable of binding haem and haemoglobin.

FrpB1 is a novel membrane protein of Helicobacter pylori that is capable of binding both haem and haemoglobin but consistently shows more affinity for haem. The mRNA levels of frpB1 were repressed by iron and lightly modulated by haem or haemoglobin. The overexpression of the frpB1 gene supported cellular growth when haem or haemoglobin were supplied as the only iron source.

Transferrin regulates mRNA levels of a gene involved in iron utilization in Entamoeba histolytica.

Entamoeba histolytica is a human pathogen, which can survive using haemoglobin (Hb) as only iron supply. Two probable haemophores (Ehhmbp26 and Ehhmbp45) are involved in iron acquisition in this parasite. However, mechanisms related to their transcriptional regulation have not been studied yet.

Entamoeba histolytica secretes two haem-binding proteins to scavenge haem.

Entamoeba histolytica is a human pathogen which can grow using different sources of iron such as free iron, lactoferrin, transferrin, ferritin or haemoglobin. In the present study, we found that E. histolytica was also capable of supporting its growth in the presence of haem as the sole iron supply.

Cloning and identification of a gene coding for a 26-kDa hemoglobin-binding protein from Entamoeba histolytica.

The capability of Entamoeba histolytica to use hemoglobin (Hb) as an iron source has been documented. However, the underlying mechanism to acquire iron from this source is poorly understood. In the present work, an in silico analysis in the E.

Ehhmbp45 is a novel hemoglobin-binding protein identified in Entamoeba histolytica.

Hemoglobin-binding proteins are necessary for pathogens to obtain iron from Hb. Entamoeba histolytica can grow using Hb as source of iron, but the underlying mechanism has not previously been established. In this work, we identified a 45 kDa Hb-binding protein of E.