Search results for "Cyst"
showing 10 items of 1960 documents
Autophagy, cathepsin L transport, and acidification in cultured rat fibroblasts.
1992
The mechanisms of enzyme delivery to and acidification of early autophagic vacuoles in cultured fibroblasts were elucidated by cryoimmunoelectron microscopic methods. The cation-independent mannose-6-phosphate receptor (MPR) was used as a marker of the pre-lysosomal compartment, and cathepsin L and an acidotropic amine (3-(2,4-dinitroanilino)-3'-amino-N-methyl-dipropylamine (DAMP), a cytochemical probe for low-pH organelles) as markers of both pre-lysosomal and lysosomal compartments. In addition, cationized ferritin was used as an endocytic marker. In ultrastructural double labeling experiments, the bulk of all the antigens was found in vesicles containing tightly packed membrane material…
Effect of vitamin supplementation on hyperhomocysteinemia and cardiovascular risk reduction
2010
Homocysteine is a sulfur-containing aminoacid produced during methionine metabolism. Since 1969 the relationship between altered homocysteine metabolism and both coronary and peripheral atherotrombosis has been known; in recent years, experimental evidence has shown that elevated plasma concentrations of homocysteine are associated with an increased risk of atherosclerosis and cardiovascular ischemic events. Several mechanisms by which elevated homocysteine concentrations impair vascular function have been proposed, including impairment of endothelial function, production of reactive oxygen species and consequent oxidation of low-density lipoproteins. Folate and B vitamins, required for rem…
Role of inflammation and infection in vascular disease
2006
Relationship of infection, inflammation, and atherosclerosis has been a subject of intensive investigation in recent years. Potential mechanisms whereby chronic infections may play a role in atherogenesis are myriad. Chlamydia pneumoniae (Cp) infection in early life may accelerate atherosclerosis, leading to cardiovascular complications. Other infections, simultaneously occurring with Cp, may result in a synergistic effect to promote atherosclerosis. Chronic Helicobacter pylori infection is known to increase the pH level of the gastric juice and to decrease ascorbic acid levels, both of which will lead to a reduced folate absorption. Low folate hampers the methionine synthase reaction. This…
Amino acid substitutions enhancing thermostability of Bacillus polymyxa beta-glucosidase A
1996
Mutations enhancing the thermostability of β-glucosidase A of Bacillus polymyxa, a family 1 glycosyl hydrolase, have been obtained after hydroxylamine mutagenesis of a plasmid containing the bglA gene, transformation of Escherichia coli with the mutagenized plasmid, and identification of transformant colonies that showed β-glucosidase activity after a thermal treatment that inactivated the wild-type enzyme. Two additive mutations have been characterized that cause replacement of glutamate at position 96 by lysine and of methionine at position 416 by isoleucine respectively. The thermoresistant mutant enzymes showed increased resistance to other denaturing agents, such as pH and urea, while …
Ocurrence of enteroparasites with zoonotic potential in animals of the rural area of San Andres, Chimborazo, Ecuador.
2021
Abstract Objective The aim of this research was the identification of the enteroparasites harbored by the animals of the San Andres community, to evaluate their role as susceptible hosts and sources of infection for other animals, humans (zoonoses), as well as parasite forms spreaders to the environment in this rural area, located in the province of Chimborazo, Ecuadorian Andean region. Material and methods The study was carried out combining 3 coproparasitological techniques: direct examination, Ritchie and Ziehl-Neelsen in 300 animal stool samples Results Blastocystis sp., Entamoeba spp., Giardia spp., Balantidium spp., Cryptosporidium spp., Ascaris spp., Toxocara spp., Ancylostoma spp., …
Impact of probiotics on risk factors for cardiovascular diseases. A review.
2014
International audience; Probiotic microorganisms have historically been used to rebalance disturbed intestinal microbiota and to diminish gastrointestinal disorders, such as diarrhea or inflammatory bowel diseases (e.g., Crohn's disease and ulcerative colitis). Recent studies explore the potential for expanded uses of probiotics on medical disorders that increase the risk of developing cardiovascular diseases and diabetes, such as obesity, hypercholesterolemia, arterial hypertension, and metabolic disturbances such as hyperhomocysteinemia and oxidative stress. This review aims at summarizing the proposed molecular and cellular mechanisms involved in probiotic-host interactions and to identi…
Hyperhomocysteinemia and Cardiovascular Risk: Effect of Vitamin Supplementation in Risk Reduction
2010
Abstract Homocysteine is a sulfur-containing aminoacid produced during metabolism of methionine. Since 1969 the relationship between altered homocysteine metabolism and both coronary and peripheral atherotrombosis has been known; in recent years experimental evidences have shown that elevated plasma levels of homocysteine are associated with an increased risk of atherosclerosis and cardiovascular ischemic events. Several mechanisms by which elevated homocysteine impairs vascular function have been proposed, including impairment of endothelial function, production of Reactive Oxygen Species (ROS) and consequent oxidation of low-density lipids. Folic acid and B vitamins, required for remethyl…
The effect of methionine and folic acid administered in ovo on the hematological parameters of chickens (Gallus gallus domesticus)
2020
Abstract Methionine (Met), an essential amino acid in poultry diets, when overdosed may cause hyperhomocysteinemia, which is mainly a trigger for cardiovascular diseases in humans. Homocysteine is neutralized (remethylated) in the presence of folic acid (FA), which also plays an important role in hematopoiesis and participates in the synthesis of DNA, and its deficiencies may result in the development of neural tube defects. One of the basic tools in studying the impact of both xenobiotics and nutrients on the animal organism is hematological analysis. Thus, the aim of this study was to determine the effect of in ovo supplementation with Met and FA on the hematological parameters of broiler…
Body composition of individuals with polycystic ovary syndrome
2009
Polycystic ovary syndrome (PCOS) is one of the principle forms of hyperandrogenism that affects women of reproductive age. Few studies have evaluated the body composition of patients with PCOS being based mainly on an evaluation of the quantity and distribution of the fat mass. Objectives: to evaluate the body composition of patients affected by PCOS and to establish the hormonal factors that determine possible differences in body composition compared with healthy women. Methods: 110 Caucasian women affected by clinical hyperandrogenism and/or irregular menstrual periods were included in the study; the control group was made up of 90 healthy Caucasian women, of reproductive age, without hyp…
Cerebral protection during fetal-to-neonatal transition under hypoxic atmosphere
2017
Newborn asphyxia is a complication during the perinatal period. The use of O2 for resuscitation has been broadly used in clinic. However, it has been demonstrated that oxygen overexposure induces oxidative stress (OS). We speculate that delaying postnatal in the extrauterine oxygenation status would preserve reducing equivalents, enhance redox adaptation, and protect oxyregulator tissues. The objective is evaluated OE status, induced by Fetal-Neonatal Transition (FNT) under different FiO2 conditions, in brain. FiO2 in pregnant mice was reduced from 21% to 14% or not the night before of delivery (G19). 8 hours after birth both group were led to room air (Hx14/21 and Nx21/21 groups) or hypero…