scholarly journals DEVELOPMENT OF CYTOSTATIC EFFECT OF MONOCLONAL ANTIBODIES TO THE PROTEINS PRAME

2016 ◽  
Vol 15 (4) ◽  
pp. 53-58
Author(s):  
N. A. Lyzhko ◽  
V. A. Misyurin ◽  
Y. P. Finashutina ◽  
T. V. Akhlynina ◽  
L. A. Kesaeva ◽  
...  
Keyword(s):  
Monoclonal Antibody ◽  
Growth Rate ◽  
Monoclonal Antibodies ◽  
Cell Growth ◽  
Cell Lines ◽  
Cytotoxic Effect ◽  
Live Cells ◽  
Cell Growth Rate ◽  
Mtt Test ◽  
Normal Tissues

Introduction. PRAME protein is a promising target for cancer immunotherapy. PRAME is not expressed in normal tissues, but active in number of the tumor types. We have developed the mouse monoclonal antibodies 5D3F2 and 6H8F12 against PRAME epitopes. Aim. To determine the effects provided by the monoclonal antibodies 5D3F2 and 6H8F12 against the cells with different levels of PRAME gene expression. Materials and methods. We used different cell lines: NOMO-1 and WI-38 with low levels of expression PRAME; THP-1 with intermediate level of PRAME expression; K562 and WI-38-PRAME with high level of PRAME expression. We incubated these cell lines in the presence of monoclonal antibodies 5D3F2 and 6H8F12. The final concentration of monoclonal antibodies in culture varied from 6 pg/ml to 120 mcg/ml. The live cells were counted at the 24, 48 and 72 hours after incubation. The number of dead cells was evaluated by the MTT-test after 24 hours. Results. Cell growth rate is significanely decreased during incubation with monoclonal antibodies. This effect is correlated with increase of monoclonal antibody concentrations (Pearson coefficient 0,67;p = 0,0219). K562 growth rate was much less compared to the THP-1’s rate (p = 0,0061), NOMO-1 (p = 0,0005) and WI-38 (p = 0,0002) in the presence of the same amount of monoclonal antibody 6H8F12. K562 cell growth rate was lower than the WI-38-PRAME’s rate (p = 0,0027), despite the comparable level of PRAME expression. Effects of monoclonal antibody 5D3F2 and 6H8F12 were similar (p = 0,3946). According to the MTT-test, the comparable number of death cells in K562 and WI-38-PRAME was observed (p = 0,8405). Under the same conditions the amount of death cells in THP-1 was smaller than K562 (p = 0,6335). To compare with K562, fewer cells died in NOMO-1 and WI-38 (p = 0,0026 and p = 0,0005, respectively). Conclusion. It was shown that monoclonal antibody 5D3F2 and 6H8F12 exhibit a significant cytotoxic effect against PRAME-express-ing cells. In case of higher levels of PRAME expression the cytotoxic effect was stronger.

Human monoclonal antibody BT32/A6 and a cell cycle—independent glioma-associated surface antigen

1995 ◽  
Vol 82 (3) ◽  
pp. 475-480 ◽  
Author(s):  
Michael D. Dan ◽  
Elizabeth M. Earley ◽  
Mark C. Griffin ◽  
Pradip K. Maiti ◽  
Ashok K. Prashar ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Monoclonal Antibody ◽  
Flow Cytometry ◽  
Growth Rate ◽  
Cell Growth ◽  
Surface Antigen ◽  
Immunoglobulin M ◽  
Cell Growth Rate ◽  
Culture Viability ◽  
A Cell

✓ The purpose of this study was to ascertain how various growth parameters may influence the labeling of SK-MG-1, a human glioma cell line, by BT32/A6, a human immunoglobulin M monoclonal antibody (MAb). By growing SKMG-1 cells at different culture split ratios, significant trends in cell growth rate, culture viability, and cell cycle state were produced. Labeling of SK-MG-1 cells by BT32/A6, however, was shown to be unaffected by culture split ratio (p > 0.05) and is therefore independent of cell growth rate, culture viability, and cell cycle state. Using flow cytometry and fluorescence-activated cell sorting, BT32/A6 was shown to label a cell surface antigen on viable, clonogenic cells of SK-MG-1. Approximately 100% of SK-MG-1 cells were shown by flow cytometry to express the BT32/A6 antigen. The recognition of a glioma-associated, cell cycle-independent surface antigen by MAb BT32/A6 makes it a promising candidate for further studies aimed at elucidating its usefulness as an adjunct in the treatment of human malignant gliomas.

Two newly introduced Wolbachia endosymbionts induce cell host differences in competitiveness and metabolic responses

2021 ◽  
Author(s):  
Tong-Pu Li ◽  
Si-Si Zha ◽  
Chun-Ying Zhou ◽  
Xue Xia ◽  
Ary A. Hoffmann ◽  
...  
Keyword(s):  
Growth Rate ◽  
Cell Growth ◽  
Infected Cell ◽  
Cell Line ◽  
Cell Lines ◽  
Aedes Albopictus ◽  
Metabolic Effects ◽  
Metabolic Responses ◽  
Infected Cell Line ◽  
Cell Growth Rate

Wolbachia endosymbionts can induce multiple reproductive manipulations in their hosts, with cytoplasmic incompatibility (CI) being one of the most common manipulations. The important agricultural pests, white-backed planthopper ( Sogatella furcifera ) and brown planthopper ( Nilaparvata lugens ), are usually infected with CI-inducing Wolbachia w Fur and non-CI-inducing Wolbachia w Lug, respectively. The biological effects of these infections when present in a host cell are unknown. Here, we introduced the two Wolbachia strains into an Aedes albopictus cell line to stably establish a w Fur-infected cell line (WFI) and a w Lug-infected cell line (WLI). In a mixed culture, WFI cells were completely replaced by WLI cells, pointing to a stronger competitiveness of the WLI cell line. We found that infection by both Wolbachia strains reduced cell growth rates, but WLI had a faster cell growth rate than WFI, and this difference in cell growth rate combined with possible Wolbachia differences in diffusivity may have affected cell competitiveness. By examining gene expression and metabolites in the two lines, we found that some genes and key metabolites responded to differences in cell competitiveness. These results point to potential mechanisms that could contribute to the relative performance of hosts infected by these strains and also highlight the substantial impact of a non-CI Wolbachia on metabolism, which may in turn influence fitness of its native host. IMPORTANCE Wolbachia transinfection in insects can be used to suppress pests and block virus transmission. We stably introduced two Wolbachia strains from rice planthoppers into cell lines of an important arbovirus mosquito vector, Aedes albopictus . The competitiveness of host cells from the lines infected by the two Wolbachia strains was different, as were metabolic responses of the cell lines. These results suggest potential metabolic effects of Wolbachia on native hosts which could be exploited when they are transinfected into novel hosts for pest control.

82 Methyl Donor Supplementation Alters Cytosine Methylation and Biological Processes of Cells Cultured in Divergent Glucose Media Reflecting Improvements in Mitochondrial Respiration and Cell Growth Rate

2021 ◽  
Vol 99 (Supplement_1) ◽  
pp. 109-109
Author(s):  
Matthew S Crouse ◽  
Wellison Jarles Da Silva Diniz ◽  
Joel Caton ◽  
Carl R Dahlen ◽  
Lawrence P Reynolds ◽  
...  
Keyword(s):  
Growth Rate ◽  
Cell Proliferation ◽  
Cell Growth ◽  
Vitamin B12 ◽  
Mitochondrial Respiration ◽  
Cytosine Methylation ◽  
Biological Processes ◽  
Cell Growth Rate ◽  
Metabolic Processes ◽  
Positive Regulation

Abstract We hypothesized that supplementation of one-carbon metabolites (OCM: methionine, folate, choline, and vitamin B12) to bovine embryonic tracheal fibroblasts in divergent glucose media would alter cytosine methylation, and alterations in cytosine methylation will reflect biological processes matching previously improved mitochondrial respiration, cell proliferation, and cell growth rate data. Cells were cultured with 1g/L glucose (Low) or 4.5g/L glucose (High). Control medium (CON) contained basal concentrations of folate (0.001g/L), choline (0.001g/L), vitamin B12 (4µg/L), and methionine (0.015g/L). The OCM were supplemented at 2.5 and 5 times (2.5X and 5X, respectively) the CON media, except methionine was limited to 2X across all supplemented treatments. Cells were passaged three times in their treatment media before DNA extraction. Reduced representation bisulfite sequencing was adopted to analyze and compare the genomic methylation patterns within and across treatments using edgeR. Biological processes (BP) were retrieved based on the nearest genes of differentially methylated cytosines (P < 0.01) for each comparison between treatments. In both Low and High treatments, greater OCM increased the proportion of hypomethylated vs. hypermethylated cytosines. Functional analyses pointed out positive regulation of BP related to energy metabolism, except for the contrasts within the High group. Among the BP, we can highlight positive regulation of: GTPase activity, catalytic activity, molecular function, protein modification processes, phosphorylation, protein phosphorylation, cellular protein metabolic processes, MAPK cascade, and metabolic processes. These data support previously reported results from this experiment that showed increased mitochondrial respiration, cell proliferation, and growth rates with increasing OCM levels. We interpret these data to imply that when energy and OCM requirements are met for growth and basal methylation levels, DNA methylation levels decrease which may allow for greater transcription. Thus, OCM can be utilized for other functions such as polyamine synthesis, nucleotide synthesis, energetic metabolites, and phosphatidylcholine synthesis. USDA is an equal opportunity provider and employer.

PGE2 inhibition & interferon-gamma restoration of type 1 T cell growth rate in atopic dermatitis

1993 ◽  
Vol 6 (1) ◽  
pp. 27
Author(s):  
Sai C. Chan ◽  
Shi-Hua Li ◽  
William R. Henderson ◽  
Jon M. Hanifin
Keyword(s):  
Growth Rate ◽  
Atopic Dermatitis ◽  
T Cell ◽  
Cell Growth ◽  
Interferon Gamma ◽  
Cell Growth Rate ◽  
T Cell Growth

scholarly journals ANTAGONISM BY DIBUTYRYL ADENOSINE CYCLIC 3',5'-MONOPHOSPHATE AND TESTOSTERONE OF CELL ROUNDING REACTIONS

1973 ◽  
Vol 59 (2) ◽  
pp. 471-479 ◽  
Author(s):  
Brian Storrie
Keyword(s):  
Growth Rate ◽  
Protein Synthesis ◽  
Cell Growth ◽  
Concanavalin A ◽  
Divalent Cations ◽  
Cell Growth Rate ◽  
Dibutyryl Camp ◽  
Cell Rounding ◽  
Drug Removal ◽  
Kinetics Of

In an attempt to understand further the mechanism of the morphological and functional "reverse transformation" of CHO-K1 cells induced by dibutyryl adenosine cyclic 3',5'-monophosphate (cAMP) and testosterone, the kinetics of variation in the susceptibility of cells to rounding after the addition or deletion of dibutyryl cAMP and testosterone have been investigated. Changes in susceptibility to cell rounding upon removal of divalent cations or pulse exposure to concanavalin A were complete within 0.5–1 h after addition or deletion of drug. In comparison, the gross conversion of CHO-K1 cells from epithelial- to fibroblast-like morphology after drug treatment or the converse change after drug removal required 8 or 4 h, respectively. The effects on cell rounding are not caused by an effect of dibutyryl cAMP upon cell growth rate. Inhibitor experiments indicate that the changes investigated do not require continued RNA or protein synthesis and are not prevented by agents which depolymerize microtubules.

scholarly journals Three mouse monoclonal antibodies to human differentiation antigens: reactivity with two mucin-like antigens and with connective tissue fibers.

1985 ◽  
Vol 33 (11) ◽  
pp. 1095-1102 ◽  
Author(s):  
M J Mattes ◽  
K Look ◽  
J L Lewis ◽  
L J Old ◽  
K O Lloyd
Keyword(s):  
Monoclonal Antibodies ◽  
Epithelial Cells ◽  
Connective Tissue ◽  
Cell Lines ◽  
Frozen Sections ◽  
Cultured Fibroblasts ◽  
Differentiation Antigens ◽  
Normal Tissues ◽  
Carcinoma Cell Lines ◽  
Histologic Types

Three human differentiation antigens (MU78, MT334, and MQ49) have been defined by mouse monoclonal antibodies developed from mice immunized with ovarian carcinoma cell lines. Their distribution was determined on 148 cultured cell lines of various histologic types and on frozen sections of 16 normal tissues. MU78 was found in fibrillar structures in soft connective tissue with a distribution resembling that of elastin fibers; however, elastin fibers in elastic cartilage and in the aorta were nonreactive. MU78 was detected in cultured carcinoma cells of various histologic types, where it had a nonfibrillar, cytoplasmic distribution, but was not detected in normal epithelial cells in frozen sections. Cultured fibroblasts, astrocytomas, melanomas, and lymphomas did not contain MU78. In cell lines, MU78 appears to be a protein of 2000-5000 daltons. The other two antigens, MT334 and MQ49, are both mucin-like molecules, and the determinants are probably carbohydrate in nature. Of the normal tissues examined, MT334 was detected only in goblet cells of the colon, though it was present in a variety of carcinomas in culture. It was detected as both a cytoplasmic and secreted component. MQ49 was detected in various secretory epithelial cells, in Hassall's corpuscles in the thymus, and in cultured carcinomas of various histologic types. It was found on the cell surface as well as in the cytoplasm and is present on a glycolipid as well as on a sulfated mucin. These results, and results of other recent studies, demonstrate the importance of mucin-like molecules as antigens in epithelial cells and secretions.

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