A comparative study on fatty acid profile in selected vessels of coronary artery bypass graft (CABG)

Atherosclerosis is one of the leading non-communicable diseases in Sri Lanka. Analysis of fatty acid composition in blood vessels is important in understanding the development of atherosclerosis. Here, analyses of fatty acid profiles in major arteries which are commonly used in Coronary Artery Bypass Graft surgery (CABG) were subjected to investigation. Patients (n = 27) undergoing elective CABG were enrolled in the study. A small biopsy segment of the saphenous vein (SV), radial artery (RA), and left internal mammary artery (LIMA) of patients was obtained during the surgery. The fatty acid (FA) profile of tissue samples was analyzed using Gas Chromatography-Mass Spectroscopy (GCMS). Among the different arteries tested, palmitic acid and stearic acid were the predominant fatty acids. As far as monounsaturated FA (MUFA) are concerned, oleic acid was found to be the most abundant MUFA in vessels. The FA profile of LIMA samples had a higher SFA percentage and lower unsaturated FA percentage compared to other vessels. Furthermore, the vessel samples of RA indicated the highest percentage of pro-inflammatory ω -6 polyunsaturated fatty acids (PUFA) as well as a higher percentage ratio between ω -6: ω -3 PUFA. The fatty acid composition and ω -6: ω -3 PUFA ratio suggests that LIMA graft is preferred for CABG over RA and SV.

The value of Nottingham grade in breast cancer re-visited in the Sri Lankan setting

OBJECTIVE

We aimed to assess the impact of Nottingham grade (NG) on breast cancer specific survival (BCSS) and recurrence free survival (RFS) of operable breast cancer (BC) patients presenting at different TNM stages in view of assessing the value of NG in prognostication of breast cancer in the Sri Lankan setting.

METHOD

This retro-prospective study included a consecutive series of TNM stage I to III BC patients presented to our unit from 2006 to 2012. Data were collected through follow up visits, clinic and laboratory records. Grading and scoring of oestrogen receptors (ER), progesterone receptors (PR) and human epidermal growth factor receptor 2 (Her2) expressions were done by a single investigator. Kaplan-Meier and Cox-regression models were used in the survival analysis.

RESULTS

A total of 742 (NG1-12%; NG2-45%; NG3-43%) patients with a median follow up of 39.5 (range: 12 - 138) months were included. Five-year BCSS was 94%-NG1, 80%-NG2 and 72%-NG3 (p < 0.001). Five-year RFS was 86%-NG1, 75%-NG2 and 67%-NG3 (p = 0.001). Only the lymph-node status (LNS) (p = 0.001) had an independent effect on the BCSS and RFS of NG3 patients. LNS (p = 0.001), PR (p = 0.004) and Her2 (p < 0.001) independently affected the BCSS of NG2 patients. None of the factors considered had an effect on the BCSS/RFS of NG1 patients. A significant decrease in BCSS and RFS was seen with an increase in NG in the sub-group of TNM stage III (p = 0.01 and 0.011).

CONCLUSION

NG categorizes BC patients into prognostic groups with distinctly different survival outcomes. Sub-categorization of TNM stage III by NG is suggested.

Effect of circulating exosomes from transition cows on Madin-Darby bovine kidney cell function

The greatest risk of metabolic and infectious disease in dairy cows is during the transition from pregnancy to lactating (i.e., the transition period). The objective of this experiment was to determine the effects of extracellular vesicles (microvesicles involved in cell-to-cell signaling) isolated from transition cows on target cell function. We previously identified differences in the protein profiles of exosomes isolated from cows divergent in metabolic health status. Therefore, we hypothesized that these exosomes would affect target tissues differently. To investigate this, 2 groups of cows (n = 5/group) were selected based on the concentration of β-hydroxybutyrate and fatty acids in plasma and triacylglycerol concentration in liver at wk 1 and 2 postcalving. Cows with high concentrations of β-hydroxybutyrate, fatty acids, and triacylglycerol were considered at increased risk of clinical disease during the transition period (high-risk group; n = 5) and were compared with cows that had low concentrations of the selected health indicators (low-risk group; n = 5). At 2 time points during the transition period (postcalving at wk 1 and 4), blood was sampled and plasma exosomes were isolated from the high-risk and low-risk cows. The exosomes were applied at concentrations of 10 and 1 µg/mL to 5 × 10³ Madin-Darby bovine kidney cells grown to 50% confluence in 96-well plates. Results indicate a numerical increase in cell proliferation when exosomes from high-risk cows were applied compared with those from low-risk cows. Consistent with an effect on cell proliferation, quantitative reverse transcriptase PCR indicated a trend for upregulation of 3 proinflammatory genes (granulocyte colony-stimulating factor, ciliary neurotrophic factor, and CD27 ligand) with the application of high-risk exosomes, which are involved in cellular growth and survival. Proteomic analysis indicated 2 proteins in the low-risk group that were not identified in the high-risk group (endoplasmin and catalase), which may also be indicative of the metabolic state of origin. It is likely that the metabolic state of the transition cow affects cellular function through exosomal messaging; however, more in-depth research into cross-talk between exosomes and target cells is required to determine whether exosomes influence Madin-Darby bovine kidney cells in this manner.

Wide-Field Lensing Mass Maps from Dark Energy Survey Science Verification Data

We present a mass map reconstructed from weak gravitational lensing shear measurements over 139  deg2 from the Dark Energy Survey science verification data. The mass map probes both luminous and dark matter, thus providing a tool for studying cosmology. We find good agreement between the mass map and the distribution of massive galaxy clusters identified using a red-sequence cluster finder. Potential candidates for superclusters and voids are identified using these maps. We measure the cross-correlation between the mass map and a magnitude-limited foreground galaxy sample and find a detection at the 6.8σ level with 20 arc min smoothing. These measurements are consistent with simulated galaxy catalogs based on N-body simulations from a cold dark matter model with a cosmological constant. This suggests low systematics uncertainties in the map. We summarize our key findings in this Letter; the detailed methodology and tests for systematics are presented in a companion paper.

The presence of 5-HT in myenteric varicosities is not due to uptake of 5-HT released from the mucosa during dissection: use of a novel method for quantifying 5-HT immunoreactivity in myenteric ganglia

BACKGROUND

Quantifying the relative abundance of different neurotransmitters in the myenteric plexus has proved challenging using conventional immunocytochemical approaches. Here, we present a new method of quantifying neurotransmitter content of an important enteric signalling molecule, serotonin (5-HT), in the myenteric plexus of guinea pig colon under different experimental conditions.

METHODS

Sections of guinea pig distal colon were exposed to different conditions including changes in temperature, dissection protocol, stimulation with faecal pellet distension and exogenous 5-HT. Sections were fixed and immuno-labelled for 5-HT. 5-HT staining density was quantified within myenteric plexus ganglia using defined settings and an analysis approach that uses threshold settings allowing for variances in background and tissue staining intensities and which calculates the area of tissue containing 5-HT above these thresholds.

KEY RESULTS

No differences were found in 5-HT immunoreactivity in the myenteric plexus when compared between tissues that were freshly fixed, undissected, or with mucosa and submucous plexus dissected away at either 4 or 37 °C. Increased myenteric plexus 5-HT density was observed in preparations repeatedly stimulated using faecal pellet stimulation prior to fixation. Furthermore, exogenous 5-HT also increased 5-HT density.

CONCLUSIONS & INFERENCES

We demonstrate that quantitative differences in 5-HT immunoreactivity can be characterized using immunohistochemistry. This approach may be applied to measuring other neurotransmitter(s) within the enteric nervous system. While 5-HT is present in the guinea-pig enteric ganglia, this is not due to accumulation via in vitro handling and release from the mucosa, and furthermore, repeated colonic stimulation via distension increases 5-HT in the myenteric plexus.

Galanin receptor 3--a potential target for acute pancreatitis therapy

BACKGROUND

Galanin participates in the pathogenesis of acute pancreatitis (AP). The galanin receptor (GALR) sub-types involved, however, are unclear. We aimed to determine GALRs messenger RNA (mRNA) expression in mouse pancreas, describe their localization, and ascertain if GALR2 and GALR3 are involved in AP.

METHODS

Galanin receptor expression in murine whole pancreas, acinar, and islet cells was quantified by polymerase chain reaction amplification of reverse-transcribed RNA for mRNA, Western blot analysis for protein and in situ hybridization for GALR localization. Isolated acinar cells were used to determine galanin's effect on amylase secretion. Acute pancreatitis was induced in mice by caerulein injections. Mice, with and without AP, were treated with the highly selective GALR2 antagonist M871, or the specific GALR3 antagonist SNAP-37889. Indices of AP were measured at 12 h.

KEY RESULTS

Murine pancreas expresses mRNA for GALRs. In islets the expression of all GALR are comparable, whereas in acinar cells GALR3 is predominantly expressed. Western blot analysis confirmed that the GALR proteins are expressed by acinar cells. In situ hybridization analysis confirmed that GALR3 mRNA is present in islet and acinar cells, while mRNA for GALR1 and 2 is confined to islets. Galanin did not influence basal and caerulein-stimulated amylase release from acinar cells. M871 treatment reduced some, whereas SNAP-37889 treatment reduced all indices of AP (by 40-80%).

CONCLUSIONS & INFERENCES

Galanin receptor mRNA and protein are expressed in mouse pancreas, with GALR3 mRNA predominating. GALR3 antagonism reduced the severity of AP whereas GALR2 antagonism was less effective. GALR3 is a potential target for treatment of AP.

The value of serum fructosamine in comparison with oral glucose tolerance test (OGTT) as a screening test for detection of gestational diabetes mellitus

The objective of this study was to evaluate the effectiveness of a single assay of serum fructosamine as a screening test for gestational diabetes in comparison with the oral glucose tolerance test. A cross-sectional descriptive study was performed on 210 pregnant women attending antenatal clinics at Colombo South Teaching Hospital. A 75 g oral glucose tolerance test and serum fructosamine assay in the fasting state and 2 hours after ingestion of oral glucose was performed. The statistical significance of fructosamine values were assessed by Student's t-test and the reliability of the test was assessed by calculating the sensitivity and specificity. There was no significant difference in serum fructosamine levels when measured fasting and 2 hours after ingestion of 75 grams of glucose. In comparison with 75 g glucose tolerance test single assay of serum fructosamine gave a sensitivity of 87.5% and a specificity of 94.5% with regard to detection of gestational diabetes mellitus. Therefore a single assay serum fructosamine test at any time of the day can be recommended as a screening test for detection of gestational diabetes mellitus.

Changes in erythrocyte glucose-6-phosphate dehydrogenase (G6PD) and reduced glutathione (GSH) activities in the development of senile and diabetic cataracts

Oxidative and osmotic stress have been implicated in the pathogenesis of cataracts. Reactive oxygen intermediates (ROI) mediate peroxidation of membrane lipids and cause irreversible damage to lens proteins. The purpose of this study was to assess the changes in erythrocyte glucose- 6-phosphate dehydrogenase enzyme (G6PD) and reduced glutathione (GSH) levels in the development of senile and diabetic cataracts. The activity of erythrocyte G6PD and the concentration of GSH were measured to assess changes in oxidation-reduction status. The oxidation-reduction status of 26 non-diabetic non-cataract (control) subjects were compared with 24 diabetic non-cataract, 30 diabetic cataract and 28 non-diabetic cataract subjects. The results revealed that the GSH and G6PD levels of the subjects with senile cataracts were significantly lower than the subjects without cataracts. The present study reveals the risk of developing senile cataracts is associated with decreased levels of erythrocyte G6PD and GSH. In the formation of diabetic cataracts an adequate supply of NADPH (G6PD activity) is essential to produce osmotically active sorbitol in the lens.

A study of the serum carotenoids of eight cases of hypercarotenemia in Sri Lanka

Over-consumption of absorbable carotenoids causes hypercarotenemia. Although hypercarotenemia is detected in Sri Lanka, a detailed study on this condition has not been carried out previously. Two millilitres of venous blood was drawn from hypercarotenemic patients (n=8) and examined by high-performance liquid chromatography for carotenoids and vitamin A. A common high-performance liquid chromatographic pattern in serum was shown by six of the cases with beta-carotene (9.9-35.7 microg/dl), beta-cryptoxanthin and monohydroxy metabolites collectively (5.3-48.5 microg/dl), and six to eight metabolites of dihydroxy, trihydroxy and polyhydroxy metabolites (22.5-282.1 microg/dl). Vitamin A levels were within the normal range (32-61 microg/dl). However, two cases identified were abnormal. The first of these showed low beta-carotene (3.5 microg/dl) and no beta-cryptoxanthin and monohydroxy metabolites, but normal dihydroxy, trihydroxy and polyhydroxy metabolites (128.2 microg/dl). However, the vitamin A level was high (75.2 microg/dl). The other case showed high beta-carotene (212.3 microg/dl) and beta-cryptoxanthin (49.3 microg/dl) but no normal monohydroxy, dihydroxy, trihydroxy and polyhydroxy metabolites. Instead there was an atypical metabolite (343.9 microg/dl). According to the present study, excessive intake of boiled, homogenized carrot and ripe papaw is the main causative factor for hypercarotenemia. Over-consumption of carotenoids-rich plant foods may be complicated in the case of individuals having defects of either the control of the 15,15'-dioxygenase activity or metabolism of carotenoids.

Mortality related to convulsive disorders in a developing country in Asia: trends over 20 years

The cause of death as recorded in 37125 death certificates (DC) issued in the Kandy District over 20 years at five-year intervals beginning 1967 was analysed to determine the trends in mortality caused by convulsive disorders in the community. Convulsions accounted for 881 (23.7/1000) deaths, the highest number being in infancy (35.8%). A slight male preponderance of 51.5% was observed. Most of the deaths occurred in the periphery (51.6%) and in the tea estates (36.3%) as opposed to town area (12.0%). "Febrile convulsions' was the most common diagnosis in 396 (44.9%) deaths. "Convulsions' which included neonatal and infantile convulsions accounted for 186 (21.1%) deaths. Other causes included chest complications (60, 6.8%), drowning (28, 3.2%), asphyxia (20, 2.3%), status epilepticus (19, 2.2%), burns (7, 0.8%), and poisoning (2, 0.2%). The proportion of deaths due to convulsive disorders showed a decrease from 37.28/1000 in 1967 to 9.55/1000 in 1987, which was most evident in the periphery, from 60.49/1000 to 13.19/1000. This parallelled a drop in the proportion of deaths attributed to "febrile convulsions' and "convulsions'. The study shows the need to educate the public about first-aid and the subsequent management of convulsions, especially in childhood. Health personnel in developing countries should consider it mandatory to make a specific diagnosis in children who present as febrile convulsions. Appropriate antiepileptic medication and compliance can prevent death due to status epilepticus and injuries associated with seizures.

Mortality due to poisoning in a developing agricultural country: trends over 20 years

The cause of death as recorded in 37,125 death certificates (DCs) issued in the Kandy District over 20 years at 5-year intervals beginning in 1967 were analysed to determine the trends in mortality caused by poisoning in the community. Poisoning accounted for 718 (19.3 per 1000) deaths, the highest number being in the third decade of life (41.9%). Male:female ratio was 3:1. The agent responsible for 77% of the deaths was pesticides. Acids and chemicals accounted for 6.9% of the deaths. Other poisons each contributing to less than 1% of the deaths were: plant poisons, food items, drugs, kerosine oil and alcohol. Nearly half the deaths had occurred outside the town area, at home or in small hospitals in the periphery. Mortality due to poisoning showed an increasing trend during the 20 years, from 11.8 to 43/1000 deaths, and this increase was most marked in the periphery, from 8/1000 to 70/1000. This increase paralleled the increase in suicide figures in the country. Our findings call for a shift in emphasis in public education towards first-aid management of intoxication. Health services of developing countries should provide appropriate resuscitative equipment, and ensure a regular supply of antidotes and other medication to all rural hospitals. Management of pesticide poisoning should be emphasised in the curricula for medical graduates, nurses, and paramedics.

Alternative management strategies for maximising productivity in beef cattle in the subtropics

Two concurrent factorial experiments investigated the relative merits of the following management options to maximise liveweight gains in finishing cattle: breed [Hereford (Bos taurus) v. Belmont Red (B. taurus x B. indicus)]; implantation with zeranol; feed energy source (sorghum grain, molasses + urea, tropical grass pastures); feed protein source (sunflower meal, Leucaena leucocephala, tropical pasture legumes). These combinations of treatments were delivered by using nil, intermittent, or continuous grazing systems. Sixty steers of initial liveweight (� s.e) 321 � 3.6 kg were held on their respective treatments for 77 or 98 days, by which time all except those on pasture without supplement had attained at least 400 kg liveweight. Steers were slaughtered in a commercial abattoir and carcass characteristics recorded. Zeranol-implanted cattle grew faster than untreated (0.84 v. 0.66 kg/day), and there was a trend (P = 0.14) for Belmont Red cattle to grow faster than Herefords (0.83 v. 0.67 kg/day). In all systems, cattle given ad libitum sorghum grain grew significantly (P<0.05) better than those given molasses + urea (1.54-0.65 v. 0.72-0.45 kg/day). The poor performance of molasses-fed cattle was associated with low voluntary feed consumptions. The highest rates of gain (1.54 kg/day) were for penned cattle on a sorghum grain + sunflower ration. The provision of either supplement promoted better gains than that found for unsupplemented steers grazing tropical grass-legume pastures (-0.29 to +0.26 kg/day). However, cattle continuously grazing (10 steers/ha) leucaena-grass pastures and those given sunflower meal had significantly (P<0.05) higher rates of gain (0.82 and 0.91 kg/day, respectively) than cattle given molasses supplements or grazing alone. Cattle given sorghum had higher carcass weights and fat contents than those fed molasses or with grazing alone, although only those in the feedlot had acceptable fat cover at slaughter. There was no significant effect of treatments on the fatty acid composition of subcutaneous fat.