No abstract available.
Concanavalin A* ; Polyethylene Glycols* ; Polyethylene*

Many carcinomas have an active mononuclear cell infiltrates surrounding tumor. Various in vitro assays have shown that cellular constituents of peripheral blood mononuclear cells(PBMC) can alter growth of carcinoma cell line. Author compared the effects of normal fibroblasts on squamous cell carcinoma cell line(SCL-1) along with those of sctivated and/or nonactivated PBMC on SCI 1 using a skin equivalent system. This system prevents direct cellular contact by growing SCL-1 on an overlying Millicell-HA membrane and normal fibroblast or supernatants of PBMC in a lower chamber. Normal fibroblasts enhanced the outgrowth of SCL-1 and induced a more organized phenotype of SCL-1. Supernatants from nonstimulated PBMC suppressed outgrowth of SCL 1, and concanavalin A stimulated PBMC supernatants alterd rnorphology of cultured SCL-1 from a disorganized phenotype to a more organized phenotype. It is concluded that fibroblasts and PBMC may affect the growth and differentiation of SCL-1 via their mediators(cytokines)
Carcinoma, Squamous Cell* ; Cell Line* ; Concanavalin A ; Fibroblasts* ; Membranes ; Phenotype ; Skin

OBJECTIVE: Macrophage migration inhibitory factor (MIF) has emerged recently as an important regulator of inflammatory and immune responses. This work was undertaken to evaluate serum levels of MIF and in vitro MIF production by whole blood cells in patients with Behcet's disease and investigate the relationship between serum levels of MIF and clinical manifestations. METHODS: Sixty-five patients with Behcet's disease and forty-eight healthy controls were studied to evaluate serum levels of MIF. Six patients with Behcet's disease and Five healthy controls were studied for evaluating the production of MIF by whole blood cells. Serum and culture supernatant levels of MIF were measured by enzyme-linked immunosorbent assay (ELISA). The production of MIF by whole blood cells was investigated by culturing peripheral blood cells in the absence or presence of Concanavalin A (Con A). RESULTS: Serum levels of MIF were higher in patients with Behcet's disease than in healthy controls. Serum levels of MIF were changed in each patient with Behcet's disease according to clinical disease activity (higher at active state). The MIF production by Con A-stimulated peripheral blood cell culture was higher in patients with Behcet's disease than in healthy controls. CONCLUSION: Circulating levels of MIF are higher in patients with Behcet's disease than in healthy controls and the levels of MIF may be associated with clinical disease activity. MIF may play an important role as a mediator of inflammation in Behcet's disease and provide opportunity for the development of anti-MIF strategy for the treatment of patients with Behcet's disease.
Blood Cells ; Concanavalin A ; Enzyme-Linked Immunosorbent Assay ; Humans ; Inflammation ; Macrophages*

OBJECTIVE: The oligosaccharide moieties of glycoproteins and proteoglycans have a vital function in blastocyst differentiation. Concanavalin (ConA), a lectin, is known to bind on the preimplantation embryos, especially on blastocyst. In this study, we investigated whether ConA can modulate the trophoblast development and about the regulating mediator. Also, we investigated whether expansion is enough for hatching procession of the mouse blastocyst. METHOD: Embryos were collected at 72 h post hCG injection and chemicals were treated after 24 h (96 hr post hCG injection). ConA or calcium ionophore A23187 were exposed to blastocyst and than analysis the developmental process for 48 hr. Intracellular free-Ca2+ concentration in trophectoderm was measured with confocal laser microscope after exposing to ConA or calcium ionophore A23187. ConA-pretreated blastocyst exposed to the calcium ionophore A23187 and then analyzed the developmental process. Otherwise ouabain was treated to the blastocyst to block the Na+/K+-ATPase activity. RESULTS: In contrast to the control blastocyst, the ConA-exposed blastocysts developed beyond the expansion stage with significantly high rate (90.4%) at 12 h post administration. ConA induced an increase the intracellular Ca2+ concentration in trophectoderm. Calcium ionophore A23187 also stimulated expansion of blastocyst. Most of the control blastocysts developed to the hatching stage at 144 h post hCG injection. However, strongly 65% of the ConA-exposed embryos were arrested at expanded stage at same time point. The developmental progression rates to hatching stage of both ConA- and calcium ionophore A23187-expose blastocysts were significantly lower than that of the control. However ConA-pretreated embryos developed to the hatching stage like control embryos. Ouabain showed a tendency to delayed the progress to expansion stage but did not inhibit the development to the hatching stage. CONCLUSION: ConA-mediated expansion is the result of the increase of intracellular free-calcium in blastocyst stage embryo. It is suspected that expansion of the blasocyst is a essential indirect factor in hatching and the calcium may triggering the cellular mechanisms for the both expansion and hatching progression.
Animals ; Blastocyst* ; Calcimycin ; Calcium* ; Concanavalin A* ; Embryonic Structures ; Glycoproteins ; Mice* ; Ouabain ; Proteoglycans ; Trophoblasts

Treatment of rainbow trout macrophages with glycyrrhizin (GL), an aqueous extract of licorice (Glycyrrhiza glabra), enhanced their respiratory burst activity. Maximal effects were seen using concentrations of 10-100 ug/ml. GL also modulated trout lymphocytes, increasing proliferation responses to the mitogen phytohemagglutinin two-fold over a range of GL concentrations. In addition, GL elicited the release of a macrophage activating factor (MAF) kom head kidney leukocytes, as assessed by the ability of generated supernatants to increase respiratory burst activity of target macrophages. MAF activity was most apparent using 100 ug/ml GL to induce MAF release and a 48 h incubation period with the target macrophages. Finally, GL was shown to enhance the release oF MAF in response to the mitogen concanavalin A. The results suggest that GL might modulate the innate defences in fish.
Concanavalin A ; Glycyrrhiza ; Glycyrrhizic Acid* ; Head Kidney ; Leukocytes* ; Lymphocytes ; Macrophages ; Oncorhynchus mykiss* ; Oncorhynchus* ; Respiratory Burst ; Trout

Sakai's method has been known as the simplest one for determination of erythrocyte pyrimidine 5'-nucleotidase (P5N) activity using high performance liquid chromatography(HPLC). However the drawback of the method is that it is difficult to wash the erythrocyte for isolation. To search for the simpler method, we compared Sakai's method with other methods using whole blood treated with heparin and concanavalin A or whole blood treated with EDTA-2K instead of washing the erythrocyte. The mean concentrations of lead in blood samples collected from 44 male and 16 female workers who are healthy without any exposure to lead in their workplace were 4.30 +/- 1.31 microgram /dl (mean +/-standard deviation), which were measured by frameless atomic absorption spectrophotometer. Erythrocyte P5N activities were measured by 3 methods; Sakai's method(Method I), using whole blood treated with heparin and concanavalin A (Method II), and using whole blood treated with EDTA-2K (Method III). The results were obtained as follows ; 1. The mean of erythrocyte P5N activity by Sakai's method(Method I) were 12.7 +/-2.47 amole uridine/hr/gm of Hb. 2. The mean of erythrocyte P5N activity by the method using heparinized whole blood treated with concanavalin A(Method II) were 13.1 +/-2.41 micromole uridine/hr/gm of Hb. 3. The difference of mean erythrocyte P5N activity between Method I and Method was not significant. 4. The erythrocyte P5N activity by the method using whole blood treated with EDTA-2K (Method III) was significantly different from Method I. We thought that omission of incubation period which was required on Method III using EDTA-2K caused the difference between Method I and Method III. 5. Simple linear regression equation for erythrocyte P5N activity between Method I (Y) and Method II(X) was significant: Y = -0.012 + 0.9724 X. These results suggest that the method using whole blood treated with heparin and concanavalin A is simpler to examine the erythrocyte P5N activity as a biological indicator of lead intoxication than Sakai's method.
5'-Nucleotidase* ; Absorption ; Concanavalin A ; Erythrocytes* ; Female ; Heparin ; Humans ; Linear Models ; Male

Sakai's method has been known as the simplest one for determination of erythrocyte pyrimidine 5'-nucleotidase (P5N) activity using high performance liquid chromatography(HPLC). However the drawback of the method is that it is difficult to wash the erythrocyte for isolation. To search for the simpler method, we compared Sakai's method with other methods using whole blood treated with heparin and concanavalin A or whole blood treated with EDTA-2K instead of washing the erythrocyte. The mean concentrations of lead in blood samples collected from 44 male and 16 female workers who are healthy without any exposure to lead in their workplace were 4.30 +/- 1.31 microgram /dl (mean +/-standard deviation), which were measured by frameless atomic absorption spectrophotometer. Erythrocyte P5N activities were measured by 3 methods; Sakai's method(Method I), using whole blood treated with heparin and concanavalin A (Method II), and using whole blood treated with EDTA-2K (Method III). The results were obtained as follows ; 1. The mean of erythrocyte P5N activity by Sakai's method(Method I) were 12.7 +/-2.47 amole uridine/hr/gm of Hb. 2. The mean of erythrocyte P5N activity by the method using heparinized whole blood treated with concanavalin A(Method II) were 13.1 +/-2.41 micromole uridine/hr/gm of Hb. 3. The difference of mean erythrocyte P5N activity between Method I and Method was not significant. 4. The erythrocyte P5N activity by the method using whole blood treated with EDTA-2K (Method III) was significantly different from Method I. We thought that omission of incubation period which was required on Method III using EDTA-2K caused the difference between Method I and Method III. 5. Simple linear regression equation for erythrocyte P5N activity between Method I (Y) and Method II(X) was significant: Y = -0.012 + 0.9724 X. These results suggest that the method using whole blood treated with heparin and concanavalin A is simpler to examine the erythrocyte P5N activity as a biological indicator of lead intoxication than Sakai's method.
5'-Nucleotidase* ; Absorption ; Concanavalin A ; Erythrocytes* ; Female ; Heparin ; Humans ; Linear Models ; Male

The in vivo and in vitro humoral and cell-mediated immune responses of lymphocytes of BALB/c mouse exposed to mercury chloride(HgC12) were investigated. In vitro exposure of the splenocytes to mercury chloride produced overt cytotoxicity in 3 hours period. The IC50(the concentration required to inhibit a splenocyte viability by 50%) for mercury chloride was >0.1mM for cytotoxicity. In vivo mercury chloride exposed mice were significantly depressed delayed type hypersensitivity(DTH) response to sheep red blood cells(SRBC) in a dose-dependent manner compared with control group. Mercury chloride inhibited the proliferative responses of splenocytes to lipopolysaccharide. pokeweed mitogen, concanavalin A and phytohemagglutinin in a dose-dependent manner. Hemagglutinin response to SRBC in mercury chloride exposed mice was significantly depressed in a dose-dependent manner compared with control group. After 7 weeks of mercury chloride exposure in vivo. mercury chloride induced an increase of nonspecific serum IgG1 and IgE levels in BALB/c mice.
Animals ; Concanavalin A ; Hemagglutinins ; Immunoglobulin E ; Immunoglobulin G ; Lymphocytes ; Mice* ; Phytolacca americana ; Sheep

In order to find out the proliferative ability and functional capacity of peripherally expanded mature T cells, syngeneic lymph node cells were injected into thymectomized and irradiated adult mice. Donor and host T cells were evaluated in specific time points. The results were as followings. 1. As compared to the engrafted lymphocytes after transfer, we observed 54~60 fold increase in CD4 T cells and 113~130 fold increase in CD8 cells, that is, CD8 cells proliferated more than CD4 cells in the periphery. 2. Mature T cells proliferated in the periphery got activated/memory phenotype in the early period of expansion but they upregulated CD45RB and CD62L in the later period. CD44 level remained high. 3. T cells maintained their response against soluble antigen, KLH but the reactivity against some polyclonal T cell activators, such as anti-CD3 antibody and concanavalin A were reduced severely in the 6 month expanded group. 4. The leftover host T cells also proliferated in the space and they behave similar to donor T cells in proliferation and change of activation/memory markers.
Adult ; Animals ; Concanavalin A ; Humans ; Lymph Nodes ; Lymphocytes ; Mice* ; Phenotype ; T-Lymphocytes* ; Tissue Donors

A lectin from the hemolymph of purse crab, Philyra pisum, was found to have anti-proliferative activity on human lung cancer cells by our laboratory. In this study, P. pisum lectin (PPL) was molecularly characterized including molecular mass, amino acid sequences, amino acid composition, and the effects of metal ions, temperature, and pH on the activity. We found that PPL showed mitogenic activity on human lymphocytes and BALB/c mouse splenocytes. The mitogenic activity (maximum stimulation index, SI=9.57+/-0.59) of PPL on human lymphocytes was higher than that of a standard well-known plant mitogen, concanavalin A (maximum SI=8.80+/-0.59). The mitogenic activity mediated by PPL is required for optimum dosing, and higher or lower concentrations caused decreases in mitogenic response. PPL also induced mitogenic activity on mouse splenocytes, however, the maximum SI (1.77+/-0.09) on mouse splenocytes of PPL was lower than that (2.14+/-0.15) of concanavalin A. In conclusion, PPL is a metal ion-dependent monomer lectin with mitogenic activity, and could be used as a lymphocyte or splenocyte stimulator.
Amino Acid Sequence ; Animals ; Concanavalin A ; Hemolymph ; Humans ; Hydrogen-Ion Concentration ; Ions ; Lung Neoplasms ; Lymphocytes ; Mice ; Plants