• 생명과학회지
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• 제10권1호
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• pp.22-36
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• 2000

The mammary gland contains a subpopulation of epithelial cells with large proliferative potentials which are the likely targets for carcinogens. These clonogenic cells can proliferate and differentiate into functional glandular structures. Multicellular secretory alveolar units (AU) develop from these clonogens in grafts of monodispersed rat mammary epithelial cells (RMEC) in gland-free mammary fat pads in intact recipient F344 rats co-grafted with mammotropic hormone-secreting pituitary tumors (MtT F4). Multicellular nonsecretory ductal units (DU) develop in grafts of monodispersed RMEC in gland-free fat pads in adrenalectomized recipient WF rats co-grafted with MtT W10. However, this effect were reversed by hydrocortisone replacement therapy. RMEC were isolated from appropriate donor rats as monodispersed mixed cells or, alternatively, RNA＋ cells were sorted by flow cytometry of mixed RMEC stained with FITC-RNA and PE-anti-Thy-1.1 monoclonal antibody. We grafted mixed or sorted PNA+ cells in gland-free mammary fat pads in recipient rats that were endocrinologically manipulated to induce AU or DU. Cells were also isolated from these AU or DU as mixed or sorted RNA＋ cells and sub-transplanted in recipient rats treated appropriately to induce AU or DU, respectively. Cells obtained from AU in grafts gave rise to clonal AU and from DU in grafts to DU on sub-transplantation in appropriate recipients. When adrenalectomized recipient WF rats co-grafted with MtT W10 received daily subcutaneous injections of hydrocortisone for periods of 21 days following the PHA＋ cell transplantation, AU, instead of DU, were developed. The histologies of these secondary AU and DU were not different from those of the primary AU and DU. Casein and laminin proteins were demonstrated by immunocytochemical staining of primary and secondary AU. Electron micrographs also demonstrated that AU were composed of secretory cells with milk protein in the cytoplasm. DU were composed of little or non-secretory ductal epithelial cells. These AU and DU also secreted large amounts of lipids. Clonogenic cells were more common in DU than in AU. Thus, AU and DU contain persistent subpopulations of clonogenic stem-like cells.

• 한국미생물생명공학회:학술대회논문집
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• 한국미생물생명공학회 1978년도 추계학술대회
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• pp.207.2-207
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• 1978

Arthrobacter simplex (ATCC 6946) was cultured, induced and immobilized in acrylamide polymer. The characteristics of the immobilized whole-cell enayme were studied using hydrocortisone as the substrate. The enzyme activity was increased during the incubation of the gel particle in 0.5％ peptone media. The ennzyme reaction kinetics of the Δ'-dehydrogenase (3-oxosteroid Δ'-oxydo reductase, E. C. 1.3.99.4) foliowed the Michaelis-Menten type. Km and Vm values were different significantly after immobilization of the cell. The optimum pH and temperature were changed, too. Nitrogen sources such as casitone, peptone or tryptone were good media for the enzyme reaction. And there was no need to add cofactors of the enzyme in the pre-sence of energy sources used in the test. The effect of metal ions on the enzyme activity was insignificant. Organic solvents were used increase the substrate concentration and there was no optimum solvent concentration depending on the substrate concentration.

• 한국환경보건학회지
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• 제14권1호
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• pp.87-101
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• 1988

The effect of hepatic injury produced by CCL, was studied on rats receiving a low protein-high carbohydrate (7% casein), standard protein (20% casein) and a high protein diet (30% casein). The rats fed low protein diet are resistant to CCl$_4$ in its effects on the liver as judged by histology, serum enzymes(guanase, ALT) and the content of hepatic protein. On the other hand, the pretreatment of hydrocortisone before injection of CCl$_4$ to the rats fed a standard diet, slightly decreased both serum ALT and guanase activities. In the pretreatment of actinomycin D, the liver and serum guanase activities were significantly decreased. It indicates that the cause of increasing serum guanase is based on the alteration of membrane permeability and the result of accelerated enzyme synthesis in liver cells of CCl$_4$ intoxicated rats.

• 생약학회지
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• 제33권2호통권129호
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• pp.120-123
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• 2002

The possibility of Galla Rhois(GR) water extract as an antithrombotic agent was investigated. The effect of GR on platelet aggregation in human platelet-rich plasma(PRP) induced by collagen and ADP in vitro and coagulation parameters in a pathological model induced by endotoxin and hydrocortisone acetate(HA) in vivo were examined. In platelet aggregation assay, GR extract significantly inhibited platelet aggregation induced by collagen and ADP in a dose-dependent manner. GR extract significantly increased the number of platelet and shortened prothrombin time(PT) and activated thromboplastin time(APTT) as compared with the control in pathological model induced by endotoxin and HA. Also, GR extract significantly increased fibrinogen level as compared with the control in a pathological model induced HA. These results suggest that GR may be a promising antithrombotic agent.

• Archives of Pharmacal Research
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• 제13권2호
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• pp.161-165
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• 1990

For evaluating the cytolytic effects on the mouse thymocytes, four typical antiinflammatory steroids (dexamethasone, triamcinolone acetonide, prednisolone, hydrocortisone) were selected in this study. When steroids were treated to the mouse thymocytes in vitro cytolysis occurred with dose-dependent fashion and the activities were found to be paralle with the known local anti-inflammatory activities. In vivo thymus atrophogenic activities appeared by the treatment of topical and subcutaneous applications of the derivatives were also found to dose-dependent, but not coincided with the thymocyte cytolytic activities in vitro and local anti-inflammaatory activity in the case of triamcinolone acetonide. Triamicinolone acetonide induced potent thymocyte cytolysis in vitro, but showed less thymus atrophy.

• 대한수의학회지
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• 제57권1호
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• pp.47-50
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• 2017

Concentrations of cortisol, dehydroepiandrosterone and dehydroepiandrosterone-sulfate were measured by performing radioimmunoassay of the cerebrospinal fluid of 68 dogs diagnosed with idiopathic epilepsy or inflammatory, degenerative, or non-neurological disease. No steroid concentration differences were found among diagnoses. Dehydroepiandrosterone and dehydroepiandrosterone-sulfate concentrations were higher in males than in females and dehydroepiandrosterone-sulfate decreased with increasing age. No sex or age effects were observed on cortisol or hormone ratios. Although limited to a relatively small sample, our results show sex- and age-dependent variations in these neurosteroid concentrations in cerebrospinal fluid. The role of such variations in the pathophysiology of the dog brain warrants further investigation.

• 약학회지
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• 제19권4호
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• pp.234-239
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• 1975

Protocollagen proline hydroxylase (PPH) activity in the course of rebound of rat carrageenin granuloma was assyed to investigate its relationship with collagen blosynthesis. The specific activity of PPH which was inhibited significantly by treatments with hydrocortisone acetate 93mg/kg/day, 3days) was recovered near to the normal level by 48hr after the cessation of the corticoid treatments. The total enzyme activity of the granuloma of treated group was not yet recovered even on the 3rd day, still showing a significant difference from control. PPH activity expressed in terms of granuloma cells between control and the drug treated group, however, was changed showing no apparent difference throughout the experimental period. These results suggested that the synthesis of protocollagen(collagen precursor) rather than PPH activity was directly affected by administration and withdrawal of corticoid.

• Archives of Pharmacal Research
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• 제18권1호
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• pp.18-21
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• 1995

Poly(ethylene glycol)(PEG) macrocers teminated with acrylate groups and semi-interpenetrating polymer networks (IPNs) composed of poly-.epsilon.-capolactone(PCL) and PEG macromer were syntheswized with the aim of obtaining a bioerodible hydrogel that could be used to release drugs for implantable delivery system. Polymerization of PEG macromer resulted in the formation of cross-linked gels due to the multifunctionality of macromer. Non-crosslinked PCL chains were interpenetrated into the cross-linked three-dimensions networks of PEG. The IPNs, largw drug loading lower concentration of PEG macromer in the IPNs concentration and the higher molecular weight of PEG macromer. Also, 5-FU was more fast released than hydrocortisone to the increased water solubility.

• 대한수의사회지
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• 제27권5호
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• pp.288-290
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• 1991

개의 여러가지 질병상태에서 근복적인 치료나 보조적인 치료제로서의 flumethasone 투여는 아주 좋은 치료효과를 나타냈다. 우리가 병원에서 상용하는 flumethasone의 평균 투여량은 0.125$\~$0.5mg으로서 경구 또는 주사로 투여했다. 경구적으로 투여하는 주된 사용량은 1일 0.03125mg$\~$0.125mg이며 환축의 크기, 치유과정 그리고 병증의 심한 정도에 따라 양을 가감했다. 투여경로를 달리하여도 약효에 차이가 생기지는 않았다. flumethasone의 소염효과, 당신생효과 및 항독소적 치료효과에서 기존의 corticoids 투여시 나타나는 효과에 비해 정성적인 차이는 없었으나 실험실 결과와 병원에서 사용한 임상결과 flumethasone은 hydrocortisone보다 300$\~$400배 그리고 prednisone이나 prednisolone 보다는 60$\~$80배나 강한 약효를 발휘하는 것으로 나타났다. 임상적용에서 나타난 감동적인 효과에서 이러한 flumethasone의 약효에 대한 자료들이 입증되었다. 또한 치료된 동물들이 보여준 반응은 flumethasone의 약효 지속시간이 기존의 corticoids보다 더 긴 것으로 나타났다. 앞에서 언급했듯이 flumethasone 투여시는 전해질 불균형에 의해 유발되는 다음다갈증이나 다뇨증, 식욕촉진 등의 부작용이 전혀 나타나지 않았다. 이러한 flumethasone의 안전성은 기존의 corticoids로 비만동물이나 나이든 환축을 치료할때 자주 나타났던 부작용업이 장기간 치료할 수 있으므로 아주 중요하다.

• 약학회지
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• 제38권5호
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• pp.602-607
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• 1994

Based upon the previous experiments showing that kidney and lung tissues of rat had relatively abundant bradykinin binding sites, we tried to characterize and determine the densities of the bradykinin binding sites in the rabbit kidney tissue and proximal tubular cells under different growing conditions. Among the kidney tissue renal medulla segments showed the highest bradykinin binding sites. To determine which growth factors are to add in the serum free culture medium to express selectively the bradykinin binding sites in the rabbit kidney proximal tubular cells, we tried so called hormone-deletion approach and in here insulin, hydrocortisone, transferrin, triiodothyronine and prostaglandin $E_1$ are examined. By performing receptor binding assay and determination of protein concentrations, we may conclude that the most required hormones in the expression for bradykinin binding sites are insulin and transferrin, and fetal bovine serum is shown to be less effective in this regard.