scholarly journals Synergistic effects of lipopolysaccharide on phytohemagglutinin- and concanavalin A-induced deoxyribonucleic acid synthesis in human peripheral blood lymphocytes: participation of T lymphocytes.

1981 ◽  
Vol 31 (3) ◽  
pp. 1007-1013 ◽  
Author(s):  
S M Hatfield ◽  
J R Schmidtke
Author(s):  
Darya B. Nizheharodava ◽  
Galina A. Ksendzova ◽  
Aliaksei G. Sysa ◽  
Mariya Yu. Yurkevich ◽  
Maryna V. Labai ◽  
...  

Derivatives of 2-amino-4,6-di-tert-butylphenol exhibit antiviral properties and radical regulatory activity against various types of organic radicals which determines the actuality of their further investigation. But the question of aminophenol derivatives immunomodulatory activity remains open. In this regard, the aim of the study was to assess the effects of 2-amino-4,6-di-tert-butylphenol derivatives on the viability and functional potential of human peripheral blood lymphocytes. As a result of the studies, it was shown that aminophenol compounds at concentrations of 10–5–10–7 mol did not exert a toxic effect while at a concentration of 10–4 mol showed a cytotoxic effect due to the induction of secondary necrosis. Compounds N-(2-hydroxy-3,5-di-tert-butylphenyl)-4-methylbenzenesulfonamide and 2,4-di-tert-butyl-6-morpholinophenol at a concentration of 10–6 mol stimulated the extracellular production of α-interferon by peripheral blood mononuclear cells and intracellular production of γ-interferon by CD3+T-lymphocytes. An immunosuppressive effect (more than 50 %) of N-(2-hydroxy-3,5-di-tert-butylphenyl)-4-methylbenzenesulfonamide and 2,4-di-tert-butyl-6-morpholinophenol compounds at a concentration of 10–5 mol was revealed to the mitogen-induced proliferation of T-lymphocytes.


1982 ◽  
Vol 208 (1) ◽  
pp. 69-75 ◽  
Author(s):  
G Blackledge ◽  
B Vose ◽  
A J Morris ◽  
D Crowther ◽  
J T Gallagher

The binding of fluorescein-conjugated lentil lectin and concanavalin A to the surface membrane of human peripheral blood lymphocytes was studied by flow cytometry. The lymphocytes bound 3-fold more lentil lectin molecules compared with concanavalin A molecules and lentil lectin binding approached saturation at a much lower concentration than did that of concanavalin A. Lentil lectin identified two groups of lymphocytes: a low-binding T-cell fraction and a high-binding B-cell-enriched fraction. Concanavalin A did not discriminate between these populations in unseparated lymphocytes. Competition studies indicated that lentil lectin and concanavalin A were bound to different sites on the lymphocyte surface, although about 50% of lentil lectin sites were in close proximity to concanavalin A sites.


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