Assessment of vaccination with gamma radiation-attenuated infective Toxocara canis eggs on murine toxocariasis

@#Toxocara canis is a major parasite that infects many animals with high risk of human infections. This study aims at assessing the immunization with gamma radiationattenuated infective stage on rats challenged with non-irradiated dose. Level of vaccine protection was evaluated in liver and lung regarding parasitological, histopathological, biochemical and molecular parameters. Fifty rats were enrolled in three groups: group A (10 rats) as normal control; group B (20 rats) subdivided into subgroup B1 (infected control) and subgroup B2 infected then challenged after 14 days with the same dose of infection (challenged infected control); and group C (20 rats) subdivided into subgroup C1 vaccinated with a dose of 800 gray (Gy) gamma-radiated infective eggs (vaccine control) and subgroup C2 vaccinated then challenged on 14th day with same number of infective eggs (vaccinated-challenged). Tissues were stained with Haematoxylin and Eosin (H&E) for histopathological studies. Biochemical studies through detection of nitric oxide (NO) and Caspase-3 were conducted. Extent of DNA damage by Comet assay was assessed. Vaccinated-challenged subgroup revealed a marked reduction in larvae in tissues with mild associated histological changes. In addition there was accompanied reduction of NO, Casepase-3 level and DNA damage compared to the control infected group. It could be concluded that vaccination of rats with a dose of 800Gy gamma radiation-attenuated infective stage improves immune response to challenge infection and drastically reduces the morbidity currently seen.

Prevalence and outcome of pregnancy among elderly primigravida in Aminu Kano teaching hospital, Kano: a 5 year review

Background: As women increasingly delay child bearing, the proportion of women having their first delivery at ''advanced maternal age'' is expected to rise. These elderly primigravidae have traditionally been considered to be at increased risk of adverse maternal and perinatal outcomes compared to their younger counterparts, because of associated pregnancy and labour complications. Objectives: To determine the prevalence of elderly primigravidae and compare their pregnancy outcome with that of younger primigravidae in Aminu Kano Teaching Hospital, Kano. Materials And Methods: This was a retrospective case control study comparing the pregnancy outcome of primigravid mothers aged 35 years and above (elderly primigravidae) with those of younger primigravidae aged 20-25 years, who delivered at Aminu Kano Teaching Hospital between January 2009 and December 2013. Results: There were 18,452 deliveries during the period under review, out of which 295 were primigravidae aged 35 years or above giving a prevalence of 1.6%. There was statistically significant higher preterm delivery rate ( X2= 10.30, P= 0.001) and caesarean delivery rate (X2= 12.15, P= 0.0001) among the elderly primigravidae compared to younger primigravidae. The elderly primigravidae were more prone to hypertensive disorders in pregnancy (X2=23.96, P=0.0001) and diabetes (X2=4.689, P=0.030) compared to the younger primigravidae. The prevalence of antepartum haemorrhage (X2=6.434, P=0.011) and uterine fibroids (X2=5.549, P=0.019) were also statistically significant among the elderly primigravidae compared to the younger primigravidae. There was no significant difference in the other maternal and foetal outcome measures. Conclusion: The prevalence of elderly primigravidae in this study was 1.6%. The prevalence of obstetric complications such as preterm delivery, antepartum haemorrhage, uterine fibroids coexisting with pregnancy and medical conditions like hypertensive disorders in pregnancy and diabetes mellitus are higher among elderly primigravidae compared to younger primigravidae. The elderly primigravidae were also more liable to have caesarean deliveries than the younger primigravidae. However there was no difference in the fetal outcome in the two groups

Lipid composition and membrane fluidity of monkey small intestinal brush border membrane: regional differences.

Brush border membrane vesicles (BBMV) isolated from various regions of monkey small intestine were compared for lipid composition, membrane fluidity and sodium-dependent D-glucose transport. Total phospholipid content was same in all regions whereas cholesterol content was high in duodenum and jejunum as compared to ileum resulting in higher cholesterol/phospholipid molar ratios. Regional differences in individual phospholipid subclasses and fatty acids in total lipids were also observed. Fluidity measurements showed that the membranes of duodenum and jejunum were less fluid than ileum. The change in BBMV fluidity appears to be due to alteration in cholesterol/phospholipid ratio and phospholipid composition. The sodium dependent D-glucose uptake was more in duodenum and jejunum as compared to ileum. These results suggest that there is a regional difference in the lipid composition and fluidity of BBMV in monkey small intestine which may influence their function.

Studies on nonesterified fatty acids in rat intestinal cell membranes.

Lipid composition of total membrane fractions prepared from scraped rat intestinal mucosa and isolated epithelial cells were compared. Membranes prepared from mucosa had four times higher nonesterified fatty acids (NEFA) as compared to the epithelial cell membranes. Cholesterol and phospholipid contents were similar in both the membrane preparations but triglyceride content was high and di- and monoglyceride were low in epithelial cell membranes as compared to the mucosal membranes. Inclusion of p-bromophenacyl bromide, a phospholipase inhibitor, in the intestinal lumen wash solution and homogenizing buffer did not reduce the NEFA content of the scraped mucosal membranes whereas inclusion of diethyl p-nitrophenyl phosphate, a lipase inhibitor reduced it by 40%. These results suggest that NEFA are normal constituent of intestinal cell membranes.

Modulation of monkey small intestinal brush border membrane D-glucose transport by nonesterified fatty acids.

Brush border membranes isolated from monkey intestinal mucosa was found to contain considerable amount of nonesterified fatty acids. Incubation of brush border membranes with fatty acid free albumin selectively removed the free fatty acids more than 80% without altering the level of phospholipids or cholesterol. The sodium dependent D-glucose transport was stimulated by the albumin treatment. Kinetic study showed that albumin treatment did not alter the apparent affinity (Km) of the transporter for glucose whereas the maximal velocity (Vmax) was increased significantly. The sodium dependent D-glucose transport was inhibited by the exogenously added unsaturated fatty acids. Saturated fatty acids and methyl esters of unsaturated fatty acids showed no inhibition. Based on these results, it may be concluded that free fatty acids inhibit the sodium dependent intestinal D-glucose transport either by directly interacting with the transport protein or by abolishing the sodium gradient.

Covalently bound fatty acids in the gastrointestinal epithelial cell membrane.

Myristic, palmitic, stearic, oleic and linoleic acids have been identified as the covalently bound fatty acids in the monkey gastrointestinal mucosal membrane proteins and among them palmitolation was predominant. Distribution studies in various regions of the gastrointestinal mucosa showed no significant difference in the content and composition of covalently bound fatty acids in these membrane and most of the fatty acids were found to be ester linked. Total membranes from isolated crypt and villus enterocytes and colonocytes had similar composition of these fatty acids. Covalently bound fatty acid levels were higher in the small intestinal brush border membrane. As suggested for the mucus glycoproteins, covalently bound fatty acids in the intestinal epithelial cell membrane may protect these membranes from proteolytic damage from the luminal proteases.