The angiogenic activity of Aloe vera (Aloe baradensis), known as a good healing plant, was investigated. We have extracted and fractionated dichloromethane extract (G1M1D1) and methanol soluble fraction of dichloromethane extract (G1M1D1M1) which contain low-molecular weight substances of Aloe vera gel. G1M1D1 and G1D1M1 fractions induced a radially arranged, spoke-sheel-like vasculature in chick embryo chorioallantoic membrane (CAM) assay. The angiogenic activity was dose-dependent and the angiogenic pattern in the CAM assay. The angiogenic activity was dose-dependent and the angiogenic pattern in the CAM assay was very similar to that of phorbol 12-myristate-13-acetate (PMA) used as a positive control. The modified CAM assay, e simple and accurate quantitating method, was used to quntitate the angiogenic activity of G1D1M1 fraction. Application of G1M1D1M1 fraction ($100\mug/egg$) resulted in much more intense angiogenesis than in control while slightly less intense angiogenesis than in PMA (100 ng/egg).
In order to investigate the effect of neurotransmitter on myoblast differentiation in vitro, the effects of dopamine and epinephrine on myoblast fusion and on the intracellular cAMP level in cultured myoblasts were examined. Dopamine $(3\\times10^{-5}M)$ and epinephrine $(3\\times10^{-5}M)$, when added at 34 hr after cell plating, markedly inhibited myoblast fusion, and dopamine was more potent than epinephrine. Both dopamine and epinephrine had no effect on intracellular cAMP level. At the same time, exogeneous dbcAMP, $PGE_1$, and aspirin were used to examine whether cAMP is involved in myoblast differentiation. dbcAMP $(1\\times10^{-4}M)$ inhibited myoblast fusion, whereas $PGE_1 (3\\times10^{-6}M)$ had no inhibitory effect, rather enhancing myoblast fusion. Aspirin, an inhibitor of PG synthetase, was shown to inhibit myoblast fusion. Possible mechanism by which dopamine or epinephrine at a specific concentration used inhibits myoblast fusion is discussed.
The most important times during the development of young chicks are the days immediately prior to hatching and the days immediately after hatching, known as the perinatal period. A sufficient supply of nutrients during the perinatal period is a crucial during the late stage of embryonic development and the starvation period of the young chicks. The delayed post-hatch holding time can restrict the development of the gastrointestinal tract, reduce final body weight, impair muscle development, and change immunological capacities. These symptoms are deleterious to the development of young chicks. Therefore, the post-hatch holding time and its influence on the fitness of young chicks are major concerns to the poultry industry. The in ovo feeding is a practical technology for perinatal nutrition to optimize poultry production and for attenuating the stress experienced by fasting young chicks. This study will discuss in ovo feeding and its effect on the development of the chick embryo, the establishment of a healthy microbiota, and the improving immune response.
This study was conducted to identify optimistic primordial germ cells'(PGCs) migration activity using heat activated busulfan treatment for the increasing germline chimerism. Donar PGCs viability tests of important conditions for useful germ line chimerism indicated approximately $70{\sim}80%$ viability was time dependent. Transplantation experiments of PGCs into recipient embryos after busulfun treatment, showed the treatment group having 23.5% viability. By comparison, the control group showed 4.8% viability. The 96 hour treatment group and the 118 hour treatment group of the cultured PGCs showed high migration activity. Generally, the transplantation method would consider morphological and physiological characteristics before transplantation. In the present study, the effect of busulfan on migration activity showed viability highest at 53.4% after 48-hour incubation time. However, a previous study showed the best condition for transplantation time to be prior to the 48-hour incubation period, when the chicken embryo does not yet have a developed blood vessel system. In conclusion, an important condition for the production of a transgenic chicken is that most donor PGCs migrate into the recipient embryo without any inhibitory factors. The present results suggest, perhaps by using this modified method of transplantation, it can produce a more efficient chimeric germ line, transgenic chicken.
Proceedings of the Korea Society of Poultry Science Conference
/
2003.07b
/
pp.37-54
/
2003
It has been recognized that the hen. like its mammalian counterparts. provides young chicks with antibodies as protection against hostile invaders. This system facilitates the transfer of specific antibodies from serum to egg yolk. and provides a supply of antibodies called immunoglobulin Y(IgY) to the developing embryo and the hatched chick. The protection against pathogens that the relatively immuno-incompetent newly hatched chick has. is through transmission of antibodies from the mother via the egg. Egg yolk. therefore. can be loaded with a large amount of IgY against pathogens which can immobilize the existing or invading pathogens during the embryo development or in day-old chicks. Thus. the immunization of laying hens to various pathogens results in production of different antigen-specific IgY in eggs. Egg yolk contains 8~20 mg of immunoglobulins (IgY) per $m\ell$ or 136~340 mg per yolk suggesting that more than 30 g of IgY can be obtained from one immunized hen in a year. By immunizing laying hens with antigens and collecting IgY from egg yolk. low cost antibodies at less than $10 per g compared to more than $20.000 per g of mammalian IgG can be obtained. This IgY technology opens new potential market applications in medicine. public health veterinary medicine and food safety. A broader use of IgY technology could be applied as biological or diagnostic tool. nut-raceutical or functional food development. oral-supplementation for prophylaxis. and as pathogen-specific antimicrobial agents for infectious disease control. This paper has emphasized that when IgY-loaded chicken eggs are produced and consumed. the specific antibody binds. immobilizes and consequently reduces or inhibits the growth or colony forming abilities of microbial pathogens. This concept could serve as an alternative agent to replace the use of antibiotics. since today. more and more antibiotics are less effective in the treatment of infections. due to the emergence of drug-resistant bacteria.
Journal of the korean academy of Pediatric Dentistry
/
v.28
no.2
/
pp.207-218
/
2001
The purpose of this study was to investigate the direct inhibitory effect of calcium hydroxide materials on differentiation and activation of osteoclast. we used the osteoclast progenitor cells isolated from bone marrow cell of chick embryo tibia and four experimental materials [$Ca(OH)_2$ powder, Metapaste$^{(R)}$, Vitapex$^{(R)}$, Pulpdent$^{(R)}$] diluted at 0.1, 0.01, $0.05{\mu}g/ml$. There were measured both the number of differentiated osteoclast and the area of resorption lacunae. Also, we conducted MTT assay on U2OS osteoblast to examine of cytotoxic effect and obtained following result. 1. Considering the result of the inhibitory effects upon osteoclast differentiation, There were shown a significant difference increased in the following order: Metapaste$^{(R)}$, $Ca(OH)_2$ powder, Vitapex$^{(R)}$. But no significant difference was found in pulpdent group that the number of differentiated osteoclast was increased at all concentrations(p<0.05). 2. Among the three experimental groups, that is, $Ca(OH)_2$ powder, Metapaste$^{(R)}$, Vitapex$^{(R)}$ at $0.1{\mu}g/ml$ dilution that were statistically significant in reduction of the number of differentiated osteoclast. Vitapex group showed significant cytotoxic effect compared to control and another two groups exhibited no significant difference. Also, 0.2% DMSO group was shown statistically siginificant cytotoxicity (p<0.05). 3. Examining pattern and measured area of resorption lacunae in the control and the three experimental groups ,that is, $Ca(OH)_2$ powder, Metapaste$^{(R)}$, Vitapex$^{(R)}$ at $0.1{\mu}g/ml$ dilution, except $Ca(OH)_2$ powder group, statistically significant differences were found between experimental groups and control group. Also, DMSO group showed statistically significant decrease (p<0.05). From these results, we think that calcium hydroxide is responsible for suppression of hard tissue resorption by a direct inhibition of dfferentiation and activation of osteoclast.
Throughout the studies the following experimental results were obtained and are summarized: 1. Multiplication of agents in primary cell cultures of both GF classical and CR-64 acute strain of Marek's disease infected chicken kidneys was accompanied by the formation of distinct transformed cell foci. This characteristic nature of cell transformation was passaged regularly by addition of dispersed cell from infected cultures to normal chicken kidney cell cultures, and also transferred was the nature of cell transformation to normal chick-embryo liver and neuroglial cell cultures. No cytopathic changes were noticed in inoculated chick-embryo fibroblast cultures. 2. The same cytopathic effects were noticed in normal kidney cell monolayers after the inoculation of whole blood and huffy coat cells derived from both forms of Marek's disease infected chickens. In these cases, however, the number of transformed cell foci appearing was far less than that of uninoculated monolayers prepared directly from the kidneys of Marek's disease infected chickens. 3. The change in cell culture IS regarded as a specific cell transformation focus induced by an oncogenic virus rather than it plaque in slowly progressing cytopathic effect by non-oncogenic viruses, and it is quite similar to RSV focus in chick-embryo fibroblasts in many respects. 4. The infective agent (cell transformable) were extremely cell-associated and could not be separated in an infective state from cells under the experimental conditions. 5. The focus assay of these agents was valid as shown by the high degree of linear correlation (r=0.97 and 0.99) between the relative infected cell concentration (in inoculum) and the transformed cell foci counted. 6. No differences were observed between the GF classical strain and the CR-64 acute strain of Marek's disease as far as cell culture behavior. 7. Characterization of the isolates by physical and chemical treatments, development of internuclear inclusions in Infected cells, and nucleic acid typing by differential stainings and cytochemical treatments indicated that the natures of these cell transformation agents closely resemble to those described fer the group B herpes viruses. 8. Susceptible chicks inoculated with infected kidney tissue culture cells developed specific lesions of Marek's disease, and in a case of prolonged observation after inoculation (5 weeks) the birds developed clinical symptoms and gross lesions of Marek's disease. Kidney cell cultures prepared from those inoculated birds and sacrificed showed a superior recovery of cell transformation property by formation of distinct foci. 9. Electron microscopic study of infected kidney culture cells (GF agent) by negative staining technique revealed virus particles furnishing the properties of herpes viruses. The particle was measured about $100m{\mu}$ and, so far, no herpes virus envelop has been seen from these preparations. 10. No relationship of both isolates to avian leukosis/sarcoma group viruses and PPLO was observed.
The changes in histopathology of various organs and growth inhibition of the chick embryos incubated with radioactive sulfur ($^{35}S$) were experimentally studied. The various doses of $^{35}S$ were injected into the yolk sac at different intervals and the weight changes of the embryos were evaluated to determine the growth inhibition rates. The embryos sacrified on various incubation days were used for the study of histopathological changes in organs such as the bone, liver, kidney, gonad, and eye. Following were the results: 1) The weight changes of the $^{35}S$ treated groups were as follows: i. Embryos treated on the 5 th incubation day: No weight changes were noted on the 8th incubation day, however, the growth inhibition rate of 32.1% was noted in the group treated with $50{\mu}C$ and of 38.2% in the group treated with $150{\mu}C$ on the 12th incubation day. The rates were 9.1 and 12.1% on the 15th incubation day, and 6.5 and 10.6% on the 18th incubation day respectively. ii. Embryos treated on the 8th incubation day: The growth inhibition rates on the 12th, 15th and 18th incubation days in the groups treated with $50{\mu}C$ were 20.9, 25.9 and 18.8% and in those treated with $150{\mu}C$ were 20.0, 14.9 and 16.9% respectively. iii. Embryos treated on the 12th incubation day: The growth inhibition rates on the 15th and 18th in the groups treated with $50{\mu}C$ were 13.6 and 21.1% and in those treated with $150{\mu}C$ were 26.7 and 6.5% and in those treated with $250{\mu}C$ were 10.6 and 12.6% respectively. iv. Embryos treated on the 15th incubation day: The growth inhibition rates on the 18th in the groups treated with $50{\mu}C$ were 6.5% and in those treated with $150{\mu}C$ were 10.1% and in those treated with $250{\mu}C$ were 8.5% respectively. In summary, the longer the incubation days, the less the growth inhibition rates. II) The histopathological changes in the various organs were as follows: i. Bone: Hyperplasia and edematous changes of the bone cavity, irregular distribution of immature granular cells and increased number of the myeloblast, megakaryocyte and reticuloendothelial cells were noted. ii. Liver: The embryos treated with $150{\mu}C\;of\;^{35}S$ on the 8th incubation day showed necrosis and nucleolysis of the liver cell and abnormal enlargement of sinusoid on the 12th incubation day. The longer the incubation days, the more severe the changes such as the pyknotic artophy of the liver cells and heterochromatism. The embryos treated on the 5th incubation day with 50 and $150{\mu}C\;of\;^{35}S$ showed little changes, but sight enlargement and accumulation of serous fluid in the sinusoid on the 8th incubation day. iii. Kidney: No particular changes except atrophic changes of epithelium were noted in early stage, however, the infiltration of the granular cell and monocyte into the cortex and pyknotic changes of vascular glomeruli were noted in later stage. These changes were not closely related to the doses of $^{35}S$ given. iv. Gonad: The degenerative changes such as destruction of the immature germ cells, hyperplasia and vacuolization of the stroma were noted in testis and ovary. v. Eye: A slight distortion of the cornea and sclera was noted. The hypertrophy of inner layer and blood cell infiltration into the vascular layer of the choroid membrane were noted in embryo groups on the 12, 15 and 18th incubation days.
Gecko is a kind of traditional Chinese medicine with remarkable antineoplastic activity. However, undefined mechanisms and ambiguity regarding active ingredients limit new drug development from gecko. This study was conducted to assess anti-angiogenic properties of the aqueous extracts of fresh gecko (AG) or macromolecular components separated from AG (M-AG). An enzyme-linked immunosorbent assay (ELISA) approach was applied to detect the vascular endothelial growth factor (VEGF) secretion of the tumor cells treated with AG or M-AG. The effect of AG or M-AG on vascular endothelial cell proliferation and migratory ability was analyzed by tetrazolium dye colorimetric method, transwell and wound-healing assays. Chick embryo chorioallantoic membrane (CAM) assays were used to ensure the anti-angiogenic activity of M-AG in vivo. The results showed that AG or M-AG inhibited the VEGF secretion of tumor cells, the relative inhibition rates of AG and M-AG being 27.2% and 53.2% respectively at a concentration of $20{\mu}L/mL$. AG and M-AG inhibited the vascular endothelial (VE) cell proliferation with IC50 values of $11.5{\pm}0.5{\mu}L/mL$ and $12.9{\pm}0.4{\mu}L/mL$ respectively. The VE cell migration potential was inhibited significantly (p<0.01) by the AG (${\geq}24{\mu}L/mL$) or M-AG (${\geq}12\mu}L/mL$) treatment. In vivo, neovascularization of CAM treated with M-AG was inhibited significantly (p<0.05) at a concentration of ${\geq}0.4{\mu}L/mL$. This study provided evidence that anti-angiogenesis is one of the anti-tumor mechanisms of AG and M-AG, with the latter as a promising active component.
Chromosome size, number and shape were studied by the centromeric index, the arm ratio and the relative length of chromosome. The chromosomes of 50 early chick embryos which were derived from a pure line of Single Comb White Leghorns were examined. Using a colchicine, hypotonic treatment, fixation and air-drying technique, the clear prometaphase figures were obtained from the whole embryo. The results of the present investigation of chromosome pairs were as follows, 1. Pair 1 and 2; metacentric and submetacentric chromosomes which could be clearly distinguished from each other by size. 2. Pair 3 and 4: acrocentric chromosomes of similar length but the 4th pair had a distinct short arm which was not present in the 3rd. 3, Pair 5; metacentric sex chromosomes, 2 chromosome had relative 5th length but the W chromosome had slightly shorter length than 7th pair of chromosomes. 4. Pair 6; acrocentric chromosomes similar in shape to pair 3 but of little more than half the size. 5, Pair 7 and 8; acrocentric chrocentric but the 7th pairs had a definite short arm. 6. Pair 9; similar length to the 7, 8 pairs but had a medially placed centromere. 7. microchromosomes of 30 pairs ; nearly all acrocentric chromosomes which appeared as paired dots. The total number of diploid was appeared to 72-78. But a number of observations presented the total diploid number in 78 (58%). The inconstancy in number observed in this study was presumably due to the minute size of the microchromosomes. Thus, the modal numbers for the diploid chromosome was at least 78.
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