The effect of glucocorticoids on sex steroid synthesis in cultured Taenia crassiceps Wake Forest University (WFU) cysticerci

2011 ◽  
Vol 86 (4) ◽  
pp. 465-469 ◽  
Author(s):  
L. Hinojosa ◽  
R.A. Valdez ◽  
V. Salvador ◽  
A.G. Rodríguez ◽  
K. Willms ◽  
...  
Keyword(s):  
Taenia Solium ◽  
Endocrine Function ◽  
Sex Steroid ◽  
Steroid Synthesis ◽  
Infected Female ◽  
Taenia Crassiceps ◽  
The Media ◽  
First Time ◽  
Different Doses

AbstractWe have shown previously that cultured Taenia crassiceps Wake Forest University (WFU) and Taenia solium cysticerci, as well as the adult worms, synthesize sex steroid hormones from [3H]steroid precursors and that androgens and oestrogens influence the in vitro development of the parasites. Glucocorticoids (GCs) are used to control the inflammation caused by T. solium cysticerci in the brain. These steroids stimulate oestrogen synthesis in several tissues. Since there is no information on the effect of GC on the endocrine function of cysticerci, we investigated the effect of natural and synthetic GCs on the synthesis of oestrogens in cultured T. crassiceps WFU cysticerci. The cysticerci were obtained from the peritoneal cavity of infected female BALB/c mice; the cysts were washed extensively and pre-cultured in Dulbecco's Modified Eagle's Medium (DMEM) plus antibiotics for 5 days. The parasites were further cultured with different doses of corticosterone, dexamethasone or the vehicle for 5 days. [3H]Dehydroepiandrosterone (3H-DHEA) was added to the media and the cysticerci were further incubated for 6 or 24 h. Media were then removed and the steroids ether-extracted. Aliquots of the media were seeded on silica gel plates and developed in solvent systems. Parasites incubated in the presence of 3H-DHEA synthesized [3H]androstenediol, [3H]testosterone and [3H]17β-oestradiol ([3H]17β-E2). The addition of 100 nm or higher corticosterone doses to the media increased [3H]17β-E2 synthesis fourfold after 24 h. Dexamethasone also increased [3H]17β-E2 synthesis. The experiments presented here show for the first time that corticosterone and the synthetic GC dexamethasone modulate the synthesis of oestrogens by cysticerci.

scholarly journals In VivoandIn VitroGenotoxic and Epigenetic Effects of Two Types of Cola Beverages and Caffeine: A Multiassay Approach

2016 ◽  
Vol 2016 ◽  
pp. 1-15 ◽  
Author(s):  
Marcos Mateo-Fernández ◽  
Tania Merinas-Amo ◽  
Miguel Moreno-Millán ◽  
Ángeles Alonso-Moraga ◽  
Sebastián Demyda-Peyrás
Keyword(s):  
Biological Effects ◽  
Methylation Status ◽  
Repetitive Elements ◽  
Cytotoxic Activities ◽  
Epigenetic Effects ◽  
Chemopreventive Effect ◽  
First Time ◽  
Different Doses

The aim of this work was to assess the biological and food safety of two different beverages: Classic Coca Cola™(CCC) and Caffeine-Free Coca Cola (CFCC). To this end, we determined the genotoxicological and biological effects of different doses of lyophilised CCC and CFCC and Caffeine (CAF), the main distinctive constituent. Their toxic/antitoxic, genotoxic/antigenotoxic, and chronic toxicity (lifespan assay) effects were determinedin vivousing theDrosophilamodel. Their cytotoxic activities were determined using the HL-60in vitrocancer model. In addition, clastogenic DNA toxicity was measured using internucleosomal fragmentation and SCGE assays. Their epigenetic effects were assessed on the HL-60 methylation status using some repetitive elements. The experimental results showed a slight chemopreventive effect of the two cola beverages against HL-60 leukaemia cells, probably mediated by nonapoptotic mechanisms. Finally, CCC and CAF induced a global genome hypomethylation evaluated in LINE-1 and Alu M1 repetitive elements. Overall, we demonstrated for the first time the safety of this famous beverage inin vivoandin vitromodels.

Different Effects of Chorionic Gonadotropin on Taenia crassiceps and Taenia solium Cysticerci Cultured In Vitro

2007 ◽  
Vol 93 (6) ◽  
pp. 1518-1520 ◽  
Author(s):  
M. A. Díaz-Orea ◽  
A. S. de Aluja ◽  
M. de L'Erosa ◽  
E. Gomez-Conde ◽  
V. O. Castellanos Sánchez ◽  
...  
Keyword(s):  
Chorionic Gonadotropin ◽  
Taenia Solium ◽  
Taenia Crassiceps

Differential in vitro effects of insulin on Taenia crassiceps and Taenia solium cysticerci

2009 ◽  
Vol 83 (4) ◽  
pp. 403-412 ◽  
Author(s):  
G. Escobedo ◽  
M.C. Romano ◽  
J. Morales-Montor
Keyword(s):  
Insulin Receptor ◽  
Molecular Mechanisms ◽  
Taenia Solium ◽  
Normal Female ◽  
Taenia Crassiceps ◽  
Larval Stages ◽  
Porcine Cysticercosis ◽  
In Vitro Effects ◽  
Specific Insulin

AbstractHormones play a significant role in murine cysticercosis (Taenia crassiceps), and increase the frequency of porcine cysticercosis caused by Taenia solium. In the present study, we report the in vitro effect of insulin on the larval stages of T. crassiceps (ORF strain) and T. solium. In vitro exposure of T. crassiceps cysticerci to insulin was found to stimulate this parasite's reproduction twofold with respect to control values, while the same treatment had no effect on T. solium cysticerci. Moreover, normal female mice (BALB/cAnN) infected with T. crassiceps cysticerci previously exposed to insulin presented larger parasite loads than mice inoculated with vehicle-treated cysticerci. To determine the possible molecular mechanisms by which insulin affects T. crassiceps, the insulin receptor was amplified by means of reverse transcriptase-polymerase chain reaction (RT-PCR). Interestingly, both T. crassiceps and T. solium expressed the insulin receptor, although insulin had effects only on T. crassiceps. These results demonstrate that insulin has a dichotomistic effect; it acts directly only on T. crassiceps cysticerci reproduction, possibly through its binding to a specific insulin receptor synthesized by the parasite. Thus, insulin may be recognized by T. crassiceps cysticercus cells as a mitogenic factor, and contribute to parasite proliferation inside the host, as well as to the female mouse susceptibility to T.crassiceps. This phenomenon has not been reported for cysticercosis caused by T. solium, which could, in part, be related to the poor effect of insulin upon the human parasite.

scholarly journals In Vitro Effects of Albendazole Sulfoxide and Praziquantel against Taenia solium and Taenia crassiceps Cysts

2004 ◽  
Vol 48 (6) ◽  
pp. 2302-2304 ◽  
Author(s):  
Francisca Palomares ◽  
Guadalupe Palencia ◽  
Rodolfo Pérez ◽  
Dinora González-Esquivel ◽  
Nelly Castro ◽  
...  
Keyword(s):  
Taenia Solium ◽  
Taenia Crassiceps ◽  
Albendazole Sulfoxide ◽  
In Vitro Effects

ABSTRACT We investigated the minimum exposure times of prazicuantel (PZQ) and albendazole sulfoxide (ABZSO) required for their activities against Taenia cysts in vitro as well as the 50 and 99% effective concentrations. The results showed that although the effects of both drugs are time and concentration dependent, ABZSO acts much slower and is less potent than PZQ.

scholarly journals Artificial medium for in vitro pollen germination of some ornamental Linum species

2021 ◽  
Vol 35 (3) ◽  
pp. 329-332
Author(s):  
Viktor Lyakh ◽  
Anatoliy Soroka
Keyword(s):  
Pollen Germination ◽  
Artificial Medium ◽  
Breeding Programs ◽  
In Vitro Pollen Germination ◽  
The Media ◽  
Germination Of Pollen ◽  
First Time ◽  
Ornamental Species

For the first time components of the nutrient medium were identified for the successful germination of pollen in such ornamental species of the Linum genus as L. grandiflorum, L. hirsutum, L. pubescens and L. thracicum. It was shown that the media with PEG-2000 in concentrations of 20-30% in combination with boric acid and calcium chloride in the concentrations of 200 mg/l ensure germination of Linum pollen up to 40-50%. The addition of sucrose and PEG with higher molecular weight adversely affects the germination of pollen. This will allow anyone to evaluate the quality of flax pollen quickly and efficiently and more successfully implement many genetic and breeding programs.

scholarly journals Effect of sugarcane genotypes and 2, 4-dichlorophenoxy acetic acid on callus induction

2018 ◽  
pp. 237-242
Author(s):  
M. Subedi ◽  
B. R. Ojha ◽  
S. K. Ghimire ◽  
B. K. Joshi ◽  
R. K. Niroula ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Genetic Engineering ◽  
In Vitro Culture ◽  
Callus Induction ◽  
Optimum Dose ◽  
Synthetic Seed ◽  
The Media ◽  
Dichlorophenoxy Acetic Acid ◽  
Different Doses

 Callus induction is an important step in in-vitro culture valued for micropropagation, somaclonal variation, mutagenesis, synthetic seed production, transformation and genetic engineering. Callusing response of ten sugarcane genotypes viz., BO-110, BO-134, Cose-95422, Cose-98232, Cose-92423, UP-9742, BO-91, BO-135, and Cose-98255, were studied under three different doses (2, 3 & 4 mg L-1) of 2,4-D supplemented in the callus induction media. Callus induction was found to depend on both genotype and 2,4-D concentration in the media. The genotype UP-9742 was most amenable to callus induction (67.50%) followed by Cose-97182 (56.25%) and Cose-92423 (51.00%). While, the media supplemented with 3 mg L-1 2,4-D was found more effective to trigger callus induction in general. Yet, the optimum dose of 2,4-D to be used depends on the interaction of the specific genotype. Journal of the Institute of Agriculture and Animal Science.Vol. 33-34, 2015, page: 237-242

Effects of Two Different Doses of Hirudin on APTT, Determined with Eight Different Reagents

1995 ◽  
Vol 73 (02) ◽  
pp. 219-222 ◽  
Author(s):  
Manuel Monreal ◽  
Luis Monreal ◽  
Rafael Ruiz de Gopegui ◽  
Yvonne Espada ◽  
Ana Maria Angles ◽  
...  
Keyword(s):  
Ex Vivo ◽  
Anticoagulant Activity ◽  
Subcutaneous Administration ◽  
In Vitro Study ◽  
Ex Vivo Model ◽  
Suitable Candidate ◽  
Significant Prolongation ◽  
High Doses ◽  
Different Doses

SummaryThe APTT has been considered the most suitable candidate to monitor the anticoagulant activity of hirudin. However, its use is hampered by problems of standardization, which make the results heavily dependent on the responsiveness of the reagent used. Our aim was to investigate if this different responsiveness of different reagents when added in vitro is to be confirmed in an ex vivo study.Two different doses of r-hirudin (CGP 39393), 0.3 mg/kg and 1 mg/kg, were administered subcutaneously to 20 New Zealand male rabbits, and the differences in prolongation of APTT 2 and 12 h later were compared, using 8 widely used commercial reagents. All groups exhibited a significant prolongation of APTT 2 h after sc administration of hirudin, both at low and high doses. But this prolongation persisted 12 h later only when the PTTa reagent (Boehringer Mannheim) was used. In general, hirudin prolonged the APTT most with the silica- based reagents.In a further study, we compared the same APTT reagents in an in vitro study in which normal pooled plasma was mixed with increasing amount of hirudin. We failed to confirm a higher sensitivity for silica- containing reagents. Thus, we conclude that subcutaneous administration of hirudin prolongs the APTT most with the silica-based reagents, but this effect is exclusive for the ex vivo model.

Somatic Embryogenesis and In vitro Plant Regeneration in Vigna trilobata (L.) Verd. - A Potential Pasture Legume

1970 ◽  
Vol 19 (1) ◽  
pp. 89-99
Author(s):  
K. Choudhary ◽  
M. Singh ◽  
M. S. Rathore ◽  
N. S. Shekhawat
Keyword(s):  
Somatic Embryogenesis ◽  
Growth Regulators ◽  
Somatic Embryos ◽  
Basal Medium ◽  
Long Term Study ◽  
Continuous Application ◽  
First Time ◽  
Pasture Legume

This long term study demonstrates for the first time that it is possible to propagate embryogenic Vigna trilobata and to subsequently initiate the differentiation of embryos into complete plantlets. Initiation of callus was possible on 2,4-D. Somatic embryos differentiated on modified MS basal nutrient medium with 1.0 mg/l  of 2,4-D and 0.5 mg/l  of Kn. Sustained cell division resulted in globular and heart shape stages of somatic embryos. Transfer of embryos on to a fresh modified MS basal medium with 0.5 mg/l of Kn and 0.5 mg/l of GA3 helped them to attain maturation and germination. However, the propagation of cells, as well as the differentiation of embryos, were inhibited by a continuous application of these growth regulators. For this reason, a long period on medium lacking these growth regulators was necessary before the differentiation of embryos occurred again. The consequences for improving the propagation of embryogenic cultures in Vigna species are discussed. Key words: Pasture  legume, Vigna trilobata, Globular, Heart shape, somatic embryogenesis D.O.I. 10.3329/ptcb.v19i1.4990 Plant Tissue Cult. & Biotech. 19(1): 89-99, 2009 (June)

Dwindling status of Epimedium Elatum (Morren & Decne) and its geographical distribution in Kashmir Himalaya, India

2018 ◽  
pp. 47-52
Keyword(s):  
Medicinal Plant ◽  
Biological Activities ◽  
Conservation Status ◽  
Natural Populations ◽  
Culture Techniques ◽  
Kashmir Himalayas ◽  
Near Future ◽  
First Time ◽  
Tissue Culture Techniques

Epimedium elatum (Morren & Decne) of family Berberidaceace is a rare perennial medicinal plant, endemic to high altitude forests of Northwestern Himalayas in India. Ethnobotanically, it has been used as an ingredient for treatment of bone-joint disorders, impotence and kidney disorders in Kashmir Himalayas. Phytochemically, it is rich in Epimedin ABC and Icariin; all of these have been demonstrated to possess remarkable biological activities like PDE-5 inhibition (treatment of erectile dysfunction), anticancer, antiosteoporosis antioxidant and antiviral properties. The present investigation reports its traditional usage, comprehensive distribution and conservation status from twenty ecogeographical regions in Kashmir Himalayas, India. The species was reported from Gurez valley for the first time. Numerous threats like excessive grazing, deforestration, habitat fragmentation, tourism encroachment, landslides and excessive exploitation have decreased its natural populations in most of the surveyed habitats. Consequently, its existence may become threatened in near future if timely conservation steps are not taken immediately by concerned stakeholders involved in medicinal plant research. Moreover, use of plant tissue culture techniques is recommended for development of its in vitro propagation protocols. Therefore, introduction of this medicinal plant in botanical gardens, protected sites and development of monitoring programmes are needed for its immediate conservation in Northwestern Himalayas, India.

Structure-Reactivity Relationships on Substrates and Inhibitors of the Lysine Deacylase Sirtuin 2 from Schistosoma Mansoni (SmSirt2)

2019 ◽  
Author(s):  
Daria Monaldi ◽  
Dante Rotili ◽  
Julien Lancelot ◽  
Martin Marek ◽  
Nathalie Wössner ◽  
...  
Keyword(s):  
Schistosoma Mansoni ◽  
Human Cancer ◽  
Egg Laying ◽  
Human Cancer Cells ◽  
Parasite Survival ◽  
Survival And Reproduction ◽  
Emergence Of Resistance ◽  
First Time ◽  
Parasitic Life Cycle

The only drug for treatment of Schistosomiasis is Praziquantel, and the possible emergence of resistance makes research on novel therapeutic agents necessary. Targeting of Schistosoma mansoni epigenetic enzymes, which regulate the parasitic life cycle, emerged as promising approach. Due to the strong effects of human Sirtuin inhibitors on parasite survival and reproduction, Schistosoma sirtuins were postulated as therapeutic targets. In vitro testing of synthetic substrates of S. mansoni Sirtuin 2 (SmSirt2) and kinetic experiments on a myristoylated peptide demonstrated lysine long chain deacylation as an intrinsic SmSirt2 activity for the first time. Focused in vitro screening of the GSK Kinetobox library and structure-activity relationships (SAR) of identified hits, led to the first SmSirt2 inhibitors with activity in the low micromolar range. Several SmSirt2 inhibitors showed potency against both larval schistosomes (viability) and adult worms (pairing, egg laying) in culture without general toxicity to human cancer cells.<br>

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