II. The morphology of interleukin-2 stimulated human peripheral blood mononuclear cells killing tumor cells In Vitro

1987 ◽  
Vol 45 ◽  
pp. 736-737
Author(s):  
M. A. Greenwood ◽  
G. R. Hook ◽  
D. Barba ◽  
B. Ikejiri ◽  
S. N. Chen ◽  
...  
Keyword(s):  
Plasma Membranes ◽  
Mononuclear Cells ◽  
Human Peripheral Blood ◽  
Interleukin 2 ◽  
Lak Cells ◽  
Peripheral Blood Mononuclear ◽  
Routine Manner ◽  
Transmission Electron

In the previous abstract, we presented data on the cytolysis of glioma-derived cells (SNB-92) by lymphokine activated mononuclear cells (LAK). In this abstract, we describe our transmission electron microscopy (TEM) study of the interaction of LAK cells and SNB-92 in vitro during a time sequence of 5 minutes to 4 hours. Co-cultures were fixed in situ by the direct addition to the culture medium of 2.5% glutaraldehyde and prepared in a routine manner for TEM.Within 30 minutes, some cells within the LAK population make contact with glioma cells (Fig 1). These LAK cells assume an elongated shape when they approach their target. The nucleus is asymmetrically located distal to the point of contact. The cellular organelles and microtubules orient towards the target cell. The plasma membranes of both cells bind closely together and form numerous interdigitations.

scholarly journals Anticancer immunity induced by a synthetic tumor-targeted CD137 agonist

2021 ◽  
Vol 9 (1) ◽  
pp. e001762
Author(s):  
Punit Upadhyaya ◽  
Johanna Lahdenranta ◽  
Kristen Hurov ◽  
Sailaja Battula ◽  
Rachel Dods ◽  
...  
Keyword(s):  
Mononuclear Cells ◽  
Tumor Antigens ◽  
Immune Cell ◽  
Checkpoint Inhibitors ◽  
Human Peripheral Blood ◽  
Interleukin 2 ◽  
Cancer Therapeutics ◽  
Peripheral Blood Mononuclear ◽  
Tnf Superfamily

BackgroundIn contrast to immune checkpoint inhibitors, the use of antibodies as agonists of immune costimulatory receptors as cancer therapeutics has largely failed. We sought to address this problem using a new class of modular synthetic drugs, termed tumor-targeted immune cell agonists (TICAs), based on constrained bicyclic peptides (Bicycles).MethodsPhage libraries displaying Bicycles were panned for binders against tumor necrosis factor (TNF) superfamily receptors CD137 and OX40, and tumor antigens EphA2, Nectin-4 and programmed death ligand 1. The CD137 and OX40 Bicycles were chemically conjugated to tumor antigen Bicycles with different linkers and stoichiometric ratios of binders to obtain a library of low molecular weight TICAs (MW <8 kDa). The TICAs were evaluated in a suite of in vitro and in vivo assays to characterize their pharmacology and mechanism of action.ResultsLinking Bicycles against costimulatory receptors (e.g., CD137) to Bicycles against tumor antigens (e.g., EphA2) created potent agonists that activated the receptors selectively in the presence of tumor cells expressing these antigens. An EphA2/CD137 TICA (BCY12491) efficiently costimulated human peripheral blood mononuclear cells in vitro in the presence of EphA2 expressing tumor cell lines as measured by the increased secretion of interferon γ and interleukin-2. Treatment of C57/Bl6 mice transgenic for the human CD137 extracellular domain (huCD137) bearing EphA2-expressing MC38 tumors with BCY12491 resulted in the infiltration of CD8+ T cells, elimination of tumors and generation of immunological memory. BCY12491 was cleared quickly from the circulation (plasma t1/2 in mice of 1–2 hr), yet intermittent dosing proved effective.ConclusionTumor target-dependent CD137 agonism using a novel chemical approach (TICAs) afforded elimination of tumors with only intermittent dosing suggesting potential for a wide therapeutic index in humans. This work unlocks a new path to effective cancer immunotherapy via agonism of TNF superfamily receptors.

scholarly journals Anti-lymphocyte globulin stimulates normal human T cells to proliferate and to release lymphokines in vitro. A study at the clonal level

Blood ◽  
1988 ◽  
Vol 72 (3) ◽  
pp. 956-963
Author(s):  
GC Barbano ◽  
A Schenone ◽  
S Roncella ◽  
R Ghio ◽  
A Corcione ◽  
...  
Keyword(s):  
T Cells ◽  
Mononuclear Cells ◽  
Human Peripheral Blood ◽  
Interleukin 2 ◽  
Suppressor Cells ◽  
Peripheral Blood Mononuclear ◽  
Gm Csf ◽  
Recombinant Interleukin 2 ◽  
Macrophage Colony

Abstract Human peripheral blood mononuclear cells (PBMC) were stimulated in vitro with anti-lymphocyte globulin (ALG), and the phenotypic and functional properties of the blasts obtained were investigated. When stained with monoclonal antibodies (MoAbs), all of the blasts were identified as T cells that expressed predominantly the CD4 phenotype (70% of the cells). The remaining blasts were CD8+. These findings demonstrate that ALG stimulates both helper-inducer and cytotoxic- suppressor cells at random since the CD4 to CD8 ratio in the stimulated blasts was the same as in resting PBMC. This ratio is different from that observed in short-term cultures of T cells stimulated with phytohemagglutinin (PHA) under the same conditions (CD4 to CD8 ratio less than 1). ALG-stimulated T cells were cloned by limiting dilution in the presence of recombinant Interleukin-2 (rIL-2). The clones obtained were expanded and maintained in long term cultures with rIL-2. Thirty-two clones were tested for their capacity of producing colony stimulating activity (CSA) or burst promoting activity (BPA). Twenty- eight of them produced CSA and 12 produced BPA. No correlation was found between the surface phenotype and the ability of the clones to produce CSA or BPA (ie, both the CD4+ and CD8+ clones released the cytokines). When 16 of the same clones were tested for II-2 and gamma interferon (gamma IFN) production, 12 were found to be gamma INF and IL- 2 producers. All of the gamma IFN producers also released IL-2, whereas in the single clones no correlation was found with the capacity of releasing BPA and CSA. Supernatants from selected T-cell clones were also tested for hematopoietic growth factor activities in the presence of neutralizing antisera to human granulocyte-macrophage colony stimulating factor (GM-CSF) or to Interleukin-3 (IL-3). It was found that most CSA was attributable to GM-CSF, whereas BPA was mainly related to the presence of IL-3.

scholarly journals In Vitro Infection of Human Peripheral Blood Mononuclear Cells by GB Virus C/Hepatitis G Virus

1999 ◽  
Vol 73 (5) ◽  
pp. 4052-4061 ◽  
Author(s):  
Marta Fogeda ◽  
Sonia Navas ◽  
Julio Martín ◽  
Mercedes Casqueiro ◽  
Elena Rodríguez ◽  
...  
Keyword(s):  
Fluorescent In Situ Hybridization ◽  
Mononuclear Cells ◽  
Human Peripheral Blood ◽  
Peripheral Blood Mononuclear ◽  
Hepatitis G Virus ◽  
Gb Virus C ◽  
Blood Mononuclear Cells ◽  
Virus C

ABSTRACT GB virus C (GBV-C), also known as hepatitis G virus, is a recently discovered flavivirus-like RNA agent with unclear pathogenic implications. To investigate whether human peripheral blood mononuclear cells (PBMC) are susceptible to in vitro GBV-C infection, we have incubated PBMC from four healthy blood donors with a human GBV-C RNA-positive serum. By means of (i) strand-specific reverse transcription-PCR, cloning, and sequencing; (ii) sucrose ultracentrifugation and RNase sensitivity assays; (iii) fluorescent in situ hybridization; and (iv) Western blot analysis, it has been demonstrated that GBV-C is able to infect in vitro cells and replicate for as long as 30 days under the conditions developed in our cell culture system. The concentration of GBV-C RNA increased during the second and third weeks of culture. The titers of the genomic strand were 10 times higher than the titers of the antigenomic strand. In addition, the same predominant GBV-C sequence was found in all PBMC cultures and in the in vivo-GBV-C-infected PBMC isolated from the donor of the inoculum. GBV-C-specific fluorescent in situ hybridization signals were confined to the cytoplasm of cells at different times during the culture period. Finally, evidence obtained by sucrose ultracentrifugation, RNase sensitivity assays, and Western blot analysis of the culture supernatants suggests that viral particles are released from in vitro-GBV-C-infected PBMC. In conclusion, our study has demonstrated, for the first time, GBV-C replication in human lymphoid cells under experimental in vitro infection conditions.

scholarly journals SCY-635, a Novel Nonimmunosuppressive Analog of Cyclosporine That Exhibits Potent Inhibition of Hepatitis C Virus RNA Replication In Vitro

2009 ◽  
Vol 54 (2) ◽  
pp. 660-672 ◽  
Author(s):  
Sam Hopkins ◽  
Bernard Scorneaux ◽  
Zhuhui Huang ◽  
Michael G. Murray ◽  
Stephen Wring ◽  
...  
Keyword(s):  
Hepatitis C Virus ◽  
Hepatitis C ◽  
Antiviral Activity ◽  
Mononuclear Cells ◽  
Human Peripheral Blood ◽  
Interleukin 2 ◽  
Jurkat Cells ◽  
Cytochrome P450 Enzymes ◽  
Peripheral Blood Mononuclear

ABSTRACT SCY-635 is a novel nonimmunosuppressive cyclosporine-based analog that exhibits potent suppression of hepatitis C virus (HCV) replication in vitro. SCY-635 inhibited the peptidyl prolyl isomerase activity of cyclophilin A at nanomolar concentrations but showed no detectable inhibition of calcineurin phosphatase activity at concentrations up to 2 μM. Metabolic studies indicated that SCY-635 did not induce the major cytochrome P450 enzymes 1A2, 2B6, and 3A4. SCY-635 was a weak inhibitor and a poor substrate for P-glycoprotein. Functional assays with stimulated Jurkat cells and stimulated human peripheral blood mononuclear cells indicated that SCY-635 is a weaker inhibitor of interleukin-2 secretion than cyclosporine. A series of two-drug combination studies was performed in vitro. SCY-635 exhibited synergistic antiviral activity with alpha interferon 2b and additive antiviral activity with ribavirin. SCY-635 was shown to be orally bioavailable in multiple animal species and produced blood and liver concentrations of parent drug that exceeded the 50% effective dose determined in the bicistronic con1b-derived replicon assay. These results suggest that SCY-635 warrants further investigation as a novel therapeutic agent for the treatment of individuals who are chronically infected with HCV.

scholarly journals Anti-lymphocyte globulin stimulates normal human T cells to proliferate and to release lymphokines in vitro. A study at the clonal level

Blood ◽  
1988 ◽  
Vol 72 (3) ◽  
pp. 956-963 ◽  
Author(s):  
GC Barbano ◽  
A Schenone ◽  
S Roncella ◽  
R Ghio ◽  
A Corcione ◽  
...  
Keyword(s):  
T Cells ◽  
Mononuclear Cells ◽  
Human Peripheral Blood ◽  
Interleukin 2 ◽  
Suppressor Cells ◽  
Peripheral Blood Mononuclear ◽  
Gm Csf ◽  
Recombinant Interleukin 2 ◽  
Macrophage Colony

Human peripheral blood mononuclear cells (PBMC) were stimulated in vitro with anti-lymphocyte globulin (ALG), and the phenotypic and functional properties of the blasts obtained were investigated. When stained with monoclonal antibodies (MoAbs), all of the blasts were identified as T cells that expressed predominantly the CD4 phenotype (70% of the cells). The remaining blasts were CD8+. These findings demonstrate that ALG stimulates both helper-inducer and cytotoxic- suppressor cells at random since the CD4 to CD8 ratio in the stimulated blasts was the same as in resting PBMC. This ratio is different from that observed in short-term cultures of T cells stimulated with phytohemagglutinin (PHA) under the same conditions (CD4 to CD8 ratio less than 1). ALG-stimulated T cells were cloned by limiting dilution in the presence of recombinant Interleukin-2 (rIL-2). The clones obtained were expanded and maintained in long term cultures with rIL-2. Thirty-two clones were tested for their capacity of producing colony stimulating activity (CSA) or burst promoting activity (BPA). Twenty- eight of them produced CSA and 12 produced BPA. No correlation was found between the surface phenotype and the ability of the clones to produce CSA or BPA (ie, both the CD4+ and CD8+ clones released the cytokines). When 16 of the same clones were tested for II-2 and gamma interferon (gamma IFN) production, 12 were found to be gamma INF and IL- 2 producers. All of the gamma IFN producers also released IL-2, whereas in the single clones no correlation was found with the capacity of releasing BPA and CSA. Supernatants from selected T-cell clones were also tested for hematopoietic growth factor activities in the presence of neutralizing antisera to human granulocyte-macrophage colony stimulating factor (GM-CSF) or to Interleukin-3 (IL-3). It was found that most CSA was attributable to GM-CSF, whereas BPA was mainly related to the presence of IL-3.

scholarly journals In Vitro Evaluation of Colloidal Silver on Immune Function: Antilymphoproliferative Activity

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
M. A. Franco-Molina ◽  
E. Mendoza-Gamboa ◽  
D. G. Zarate-Triviño ◽  
E. E. Coronado-Cerda ◽  
J. M. Alcocer-González ◽  
...  
Keyword(s):  
Cytotoxic Effect ◽  
Mononuclear Cells ◽  
Human Peripheral Blood ◽  
Interleukin 2 ◽  
Colloidal Silver ◽  
Limited Information ◽  
Immunological Activity ◽  
Immunological Parameters ◽  
Peripheral Blood Mononuclear

Colloidal silver (AgC) is currently used by humans and it can be internalized through inhalation, injection, ingestion, and dermal contact. However, there is limited information about immunological activity; more investigations using colloidal silver are needed. In the present study, the effects of AgC (17.5 ng/mL) on immunological parameters (proliferation and immunophenotyping) using human peripheral blood mononuclear cells (PBMC) and macrophages (phagocytosis) and cytotoxicity on leukemia and lymphoma cancer cell lines (1.75 to 17.5 ng/mL) were investigated. AgC was observed to significantly (p<0.05) decrease interleukin-2 (IL-2) production and proliferation induced by phytohemagglutinin or concanavalin A in PBMC without affecting its cell viability but with cytotoxic effect on cancer cells. IL-2, IL-4, IL-6, IL-10, INF-γ, and IL-17A cytokines production and CD3+, CD3−CD19+, CD3+CD4+, CD3+CD8+, and CD16+CD56+ PBMC phenotypes were not affected by AgC. The present study demonstrates that colloidal silver is harmless and nontoxic to the immune system cells and its ability to interfere with the immune response by decreasing cell proliferation when stimulated with mitogens demonstrated the antilymphoproliferative potential of AgC.

scholarly journals Clonal origin of human erythro-eosinophilic colonies in culture

Blood ◽  
1982 ◽  
Vol 59 (4) ◽  
pp. 857-864 ◽  
Author(s):  
T Nakahata ◽  
SS Spicer ◽  
M Ogawa
Keyword(s):  
Peripheral Blood ◽  
Mononuclear Cells ◽  
Human Peripheral Blood ◽  
Peripheral Blood Mononuclear ◽  
Transmission Electron ◽  
Blast Cells ◽  
Clonal Origin ◽  
Clonal Nature ◽  
Eosinophil Colonies

Abstract We have observed the presence of erythropoietic bursts containing eosinophils and their precursors in methylcellulose culture of human peripheral blood and marrow nucleated cells in the presence of erythropoietin and medium conditioned by phytohemagglutinin-stimulated leukocytes (PHA-LCM). It was possible to identify these bursts (colonies) in situ in methylcellulose culture on the basis of their unique red and black colors. Transmission electron microscopy revealed that the constituent erythroid and eosinophilic cells lay intermixed with each other, and through close intercellular connections formed compact colonies and bursts consisting of several sub-colonies. Differential counts of individual erythro-eosinophil colonies (EEo colonies) revealed only a small percentage of blast cells in most of the colonies. Replating experiments of single EEo colonies yielded only eosinophilic colonies and clusters and erythroid colonies. The clonal nature of the EEo colonies was documented by analysis of Y-chromatin- positive cells in individual EEo colonies derived from cocultures of male and female peripheral blood mononuclear cells. Comparison of conditioned media indicated that PHA-LCM is the best stimulator for EEo colonies. These studies suggest that the differentiation capabilities of the progenitors for EEo colonies are restricted to erythroid and eosinophilic differentiation.

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