905090
27 kDa Fasciola gigantica Glycoprotein for the Diagnosis of Prepatent Fasciolosis in Cattle
An indirect enzyme-linked immunosorbent assay (ELISA) using 27 kDa glycoprotein of Fasciola gigantica has been evaluated for its potential use in the diagnosis of bovine fasciolosis. Following experimental infection of rabbits, F. gigantica infection-induced antibodies were isolated and later used as ligands in affinity chromatography for isolation of infection-induced antibody-specific proteins. Among the five infection-specific proteins isolated, a glycoprotein of 27 kDa was later isolated by second-step purification using concanavalin A matrix. In crossbred cattle receiving different doses of infection (100, 200 and 400 metacercariae), the anti-27 kDa antibodies were detected as early as the 2nd week post infection. No direct correlation between initial dose, antibody response and fluke establishment was recorded. No cross-reaction was noted with the sera of goats experimentally infected with Paramphistomum epiclitum. ELISA with the 27 kDa glycoprotein could be a feasible diagnostic tool for the early detection of bovine fasciolosis.
19083493
Assessment of duration of immunity in crossbred cattle immunized with glycoproteins isolated from Hyalomma anatolicum anatolicum and Boophilus microplus
To develop immunoprophylactic measures against multi-tick infestation, two glycoproteins of 34 and 29 kDa were isolated from the larvae of Hyalomma anatolicum anatolicum and Boophilus microplus, respectively, and assessed for their efficacy against experimental challenge infestations. The synergistic effect of the antigens in the presence of incomplete Freund’s adjuvant was found to confer protection (DT%) in animals against 56.48% of larvae and 52% of adults of H. a. anatolicum, while the effect was 40% against adults of B. microplus. The efficacy (E%) of the antigens in combination against larvae and adults of H. a. anatolicum was calculated as 70% and 64.3%, respectively, and 63% against adults of B. microplus. A direct correlation between anti-glycoprotein antibody response and protection against infestation was observed. Western blot analysis detected specific antigen in the sera of animals of group A. The antigens in combination with incomplete Freund’s adjuvant could protect animals from H. a. anatolicum and B. microplus infestations for at least 30 weeks. The possibility of employing the vaccination strategy in Indian conditions is discussed.
36630069
Upcoming and future strategies of tick control: a review.
Ticks are distributed worldwide and significantly impact human and animal health. Due to severe problems associated with the continuous use of acaricides on animals, integrated tick management is recommended. Increasing public health concern over the tick-borne diseases demands the strategic control of ticks on animals that transmit diseases to human beings. Immunological control of tick vector of Kyasanur Forest Disease (KFD) on cattle and other wild reservoir hosts is one of the possible alternative strategy for reducing the transmission of KFD to man. Chemical-vaccine synergies have been demonstrated and a combination of chemical and vaccine for tick and tick-borne disease control has been identified as a sustainable option. Studies have suggested the possibility of vaccine strategies directed towards both tick control and transmission of pathogens. Besides tick vaccine, use of endosymbionts, which are essential for the survival of arthropod hosts, for the control of tick vectors will be one of the targeted areas of research in near future. India with huge natural resources of herbs and other medicinal plants, the possibilities of developing herbal acaricides is discussed. The future of research directed towards target identification is exciting because of new and emerging technologies for gene discovery and vaccine formulation.
31005724
Acaricidal properties of Ricinus communis leaf extracts against organophosphate and pyrethroids resistant Rhipicephalus (Boophilus) microplus.
Indian cattle ticks have developed resistance to commonly used acaricides and an attempt has been made to formulate an ecofriendly herbal preparation for the control of acaricide resistant ticks. A 95% ethanolic extract of Ricinus communis was used to test the efficacy against reference acaricide resistant lines by in vitro assay. In in vitro assay, the extract significantly affects the mortality rate of ticks in dose-dependent manner ranging from 35.0 ± 5.0 to 95.0 ± 5.0% with an additional effect on reproductive physiology of ticks by inhibiting 36.4-63.1% of oviposition. The leaf extract was found effective in killing 48.0, 56.7 and 60.0% diazinon, deltamethrin and multi-acaricide resistant ticks, respectively. However, the cidal and oviposition limiting properties of the extract were separated when the extract was fractionated with hexane, chloroform, n-butanol and water. The HPTLC finger printing profile of R. communis leaf extract under λ(max.) - 254 showed presence of quercetin, gallic acid, flavone and kaempferol which seemed to have synergistic acaricidal action. In vivo experiment resulted in 59.9% efficacy on Ist challenge, however, following 2nd challenge the efficacy was reduced to 48.5%. The results indicated that the 95% ethanolic leaf extract of R. communis can be used effectively in integrated format for the control of acaricide resistant ticks.
25372281
Progress in development of vaccine against Hyalomma anatolicum anatolicum-Indian scenario.
Hyalomma anatolicum anatolicum, a three host tick vector transmitting the causative agent of bovine tropical theileriosis, is widely distributed throughout India. As a component of integrated control measures against the tick vector, attempts have been made to identify candidate protein molecules for development of an anti-tick vaccine in the different stages of this tick species. By strategic methods of isolation of the targeted molecules using affinity purification of proteins showing reactivity with immunoglobulins of animals previously immunized with different sources of tick antigen, six proteins were isolated in a significantly pure form. The recovery percentage of the candidate proteins was very low in the range of 1.8-8.0%. The protective potentiality of the antigens was tested in immunization and challenge trials and maximum potential was observed in the proteins isolated from total larval extracts, nymphal extracts and in larval glycoprotein. One of the antigens with a molecular weight of 37kDa isolated from larvae of H. a. anatolicum was found to have some adverse effect on development of Theileria annulata in the vector tick. The progress in the development of immunoprophylactic measures against H. a. anatolicum is discussed.
19314963
Comparative immunopotentiating properties of saponin and incomplete Freund's adjuvant coupled to affinity purified larval antigen of Hyalomma anatolicum anatolicum.
Comparative immunostimulatory properties of saponin and incomplete Freund's adjuvant (IFA) were studied using affinity purified 39 kDa larval antigen of Hyalomma anatolicum anatolicum. Significant antibody response to 39 kDa antigen was detected in the sera of rabbits immunized with both 39 kDa plus saponin and 39 kDa plus IFA in comparison to their corresponding control animals. Insignificant differences were noted in the antibody response between the animals of two immunized groups. Upon challenge, the animals immunized with 39 kDa plus IFA rejected 76.2 +/- 9.7% of larvae and 45.8 +/- 4.1% of adults while in group of animals injected with 39 kDa plus saponin rejected 80.9 +/- 11.2% of larvae and 47.2 +/- 5.7% of adults.
11213671
Mobilization of cytoplasmic CE droplets by overexpression of human macrophage cholesteryl ester hydrolase Published, JLR Papers in Press, July 1, 2003. DOI 10.1194/jlr.M300162-JLR200
The obligatory first step in the removal of cholesterol from foam cells is the hydrolysis of stored cholesteryl esters (CEs) to release free cholesterol (FC). Neutral cholesteryl ester hydrolase (CEH) catalyzes this hydrolysis, and limiting levels of CEH could play a role in determining the susceptibility to atherosclerosis. We have recently reported the first identification and cloning of cDNA for human macrophage CEH. In the present study, we tested the hypothesis that systematically varied levels of overexpression of human macrophage CEH results in a proportional degree of reduction in cellular CE content in a cell system with known and reproducible amounts of CE accumulation. CEH expression was confirmed by demonstrating the presence of CEH mRNA and protein with an increase in CEH activity. A significant reduction in intracellular lipid droplets was observed in CEH-expressing cells, together with a decrease in cellular CE mass and a 2-fold increase in FC efflux. These results demonstrate that when human macrophage CEH is expressed in lipid-laden cells, hydrolysis and mobilization of CE (stored as lipid droplets) occur. These data establish the possibility that increased CE hydrolysis, mediated by CEH up-regulation, could represent an important mechanism to reduce the cholesterol burden of foam cells.
34065094
Application of L1-Norm Regularization to Epicardial Potential Solution of the Inverse Electrocardiography Problem
The electrocardiographic inverse problem of computing epicardial potentials from multi-electrode body-surface ECG measurements, is an ill-posed problem. Tikhonov regularization is commonly employed, which imposes penalty on the L2-norm of the potentials (zero-order) or their derivatives. Previous work has indicated superior results using L2-norm of the normal derivative of the solution (a first order regularization). However, L2-norm penalty function can cause considerable smoothing of the solution. Here, we use the L1-norm of the normal derivative of the potential as a penalty function. L1-norm solutions were compared to zero-order and first-order L2-norm Tikhonov solutions and to measured ‘gold standards’ in previous experiments with isolated canine hearts. Solutions with L1-norm penalty function (average relative error [RE] = 0.36) were more accurate than L2-norm (average RE = 0.62). In addition, the L1-norm method localized epicardial pacing sites with better accuracy (3.8 ± 1.5 mm) compared to L2-norm (9.2 ± 2.6 mm) during pacing in five pediatric patients with congenital heart disease. In a pediatric patient with Wolff–Parkinson–White syndrome, the L1-norm method also detected and localized two distinct areas of early activation around the mitral valve annulus, indicating the presence of two left-sided pathways which were not distinguished using L2 regularization.
38585383
Cloning of the human cholesteryl ester hydrolase promoter: identification of functional peroxisomal proliferator-activated receptor responsive elements.
Cholesteryl ester hydrolase (CEH) is responsible for hydrolysis of stored cholesterol esters in macrophage foam cells and release of free cholesterol for high-density lipoprotein-mediated efflux. PCR-based screening of human genomic libraries with human macrophage CEH specific primers resulted in amplification and cloning of 1.7 kb promoter sequence. Analysis of the sequence revealed a lack of consensus TATA-box but presence of a GC-rich proximal sequence, a CAAT box and several binding sites for the transcription factor Sp1. Three putative response elements for peroxisome proliferator-activated receptor (PPRE) were identified at position -176, -779, and -1316. Down-regulation of promoter activity was observed in the presence of either PPARalpha- or PPARgamma-specific ligands and introduction of a 4-point transverse mutation in the PPRE at -176 completely abolished the effect of PPAR ligands on the promoter activity. Analogous to other genes involved in macrophage cholesterol homeostasis, human CEH may also be regulated by PPAR.
13636170
Accuracy of Quadratic Versus Linear Interpolation in Noninvasive Electrocardiographic Imaging (ECGI)
Electrocardiographic Imaging (ECGI) is a cardiac functional imaging modality, noninvasively reconstructing epicardial potentials, electrograms and isochrones (activation maps) from multi-channel body surface potential recordings. The procedure involves solving Laplace’s equation in the source-free volume conductor between torso and epicardial surfaces, using Boundary Element Method (BEM). Previously, linear interpolation (LI) on three-noded triangular surface elements was used in the BEM formulation. Here, we use quadratic interpolation (QI) for potentials over six-noded linear triangles. The performance of LI and QI in ECGI is evaluated through direct comparison with measured data from an isolated canine heart suspended in a human-torso-shaped electrolyte tank. QI enhances the accuracy and resolution of ECGI reconstructions for two different inverse methods, Tikhonov regularization and Generalized Minimal Residual (GMRes) method, with the QI-GMRes combination providing the highest accuracy and resolution. QI reduces the average relative error (RE) between reconstructed and measured epicardial potentials by 25%. It preserves the amplitude (average RE reduced by 48%) and morphology of electrograms better (average correlation coefficient for QI ∼ 0.97, LI ∼ 0.92). We also applied QI to ECGI reconstructions in human subjects during cardiac pacing, where QI locates ventricular pacing sites with higher accuracy (≤ 10 mm) than LI (≤ 18 mm).
4046829
Existence of cholinephosphotransferase in mitochondria and microsomes of liver and lung of guinea pig and rat
We reported earlier on the occurrence of cholinephosphotransferase in the mitochondria of guinea pig lung. In order to determine whether organ and/or species specificities exist in regard to the cholinephosphotransferase activity in mitochondria, we have compared the subcellular distribution of the enzyme in the liver and lungs of rats and guinea pigs. Even though the activity of the enzyme was higher in microsomes than it was in mitochondria, the mitochondrial activity was authentic in both tissues of both species. The authenticity of mitochondrial activity was established by marker enzyme studies and ultrastructural examination of mitochondrial preparations.