Rosalinda Tovar

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HM-1:IMSS, a pathogenic strain of Entamoeba histolytica, and its mutant BG-3, identified by resistance to cytochalasin D, were tested for their capacity to: (i) secrete electron-dense granules; (ii) adhere and digest native type I collagen gels; and (iii) produce liver abscesses in new-born hamsters. The results demonstrate that the mutant has low adherence(More)
Dengue viruses (DENV) attach to the host cell surface and subsequently enter the cell by receptor-mediated endocytosis. Several primary and low affinity co-receptors for this flavivirus have been identified. However, the presence of these binding molecules on the cell surface does not necessarily render the cell susceptible to infection. Determination of(More)
Dengue viruses are arthropod-borne, single-stranded RNA viruses. Aëdes aegypti and Aëdes albopictus are the principal vectors. In order to understand the molecular basis of dengue virus infections we explored the biochemical identity of dengue-2 (DEN-2) virus receptors in the Aëdes albopictus-derived cell line C6/36. We show here that DEN-2 interacts with(More)
In vitro interaction of Entamoeba histolytica with collagen induces intracellular formation and release of electron-dense granules (EDG) and stimulation of collagenolytic activity. Purified EDG contain 1.66 U of collagenase per mg of protein. Thus, EDG may participate in tissue destruction during invasive amebiasis. Monoclonal antibodies (MAbs) L1.1 and(More)
The protozoan Giardia lamblia initiates infection when trophozoites emerge from a cyst in the hosts by the excystation process. Although this process is crucial to the initiation of infection by G. lamblia, little is known about its regulation. To study the possible involvement of calmodulin (CaM) in excystation we tested the effect of several CaM(More)
ApoE is a 34-kDa apoprotein that mediates lipoprotein binding to the low density lipoprotein (LDL) receptor and to the LDL receptor-related protein. Receptor binding is mediated by a highly basic, alpha-helical sequence of approximately 15 amino acids that interacts with cysteine-rich repeat regions of the receptor. To determine the relationship between the(More)
Previous reports have revealed that calmodulin antagonism by melatonin is followed by microtubule enlargements and neurite outgrowths in neuroblastoma N1E-115 cells. In addition, activation of protein kinase C (PKC) by this neurohormone is also followed by increased vimentin phosphorylation, and reorganization of vimentin intermediate filaments (IFs) in(More)
The interaction of Entamoeba histolytica with collagen induces the intracellular formation and release of electron-dense granules (EDGs) containing collagenase activity which are important in the pathogenicity of this parasite. Purified EDGs contain at least 25 polypeptides with acidic pIs, nine gelatinase activities, small molecules, including inorganic(More)
 Proteolytic activities of the protozoan parasite Entamoeba histolytica strain HM1:IMSS and the cytochalasin D-resistant mutant BG-3 were analyzed following stimulation with collagen type I and Ca2+, which induces electron-dense associated collagenase secretion. The mutant BG-3 had a protease activity of 73 kDa and secretion of total protease activity was(More)
Human endometrial curettings were selected principally from patients undergoing tubal ligations for elective sterilization. Specimens were analyzed for the metabolism of 17beta-[6,7-3H]estradiol and Na2 35SO4; assayed for the nuclear receptor content with 17beta-[6,7-3H]estradiol; and examined for the cytosol receptor content with(More)