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Selective activation of extrathymic T cells in the liver by glycyrrhizin

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Biotherapy

Abstract

Extrathymic pathways for T cell differentiation were recently demonstrated in the liver, intestine and omentum. In this study, glycyrrhizin (GL), a plant extract was investigated as to its effect on extrathymic T cells in the liver of mice. A new method using anti-LFA-1 mAb in conjunction with anti-TCR or -CD3 mAbs to sensitively identify such extrathymic T cells is included. Single injection and repeated injections of GL increased not only the number of total hepatic MNC but also the proportion of intermediate TCR cells, which are extrathymic T cells uniquely seen in the liver. In contrast to other tested reagents (e.g., lymphotoxin and estrogen) that activated the extrathymic T cells and simultaneously induced profound thymic atrophy, GL did not affect regular T cells in the thymus. The present results suggest that the selective activation of extrathymic T cells in the liver might be intimately related to the clinical effects of GL.

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Abbreviations

GL:

glycyrrhizin

TCR:

T cell receptor

mAb:

monoclonal antibody

DP:

double-positive

DN:

double-negative

MHC:

major histocompatibility complex

MNC:

mononuclear cells

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Kimura, M., Watanabe, H. & Abo, T. Selective activation of extrathymic T cells in the liver by glycyrrhizin. Biotherapy 5, 167–176 (1992). https://doi.org/10.1007/BF02171049

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  • DOI: https://doi.org/10.1007/BF02171049

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