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Morphologic, flow cytometric, functional, and molecular analyses of S100B positive lymphocytes, unique cytotoxic lymphocytes containing S100B protein.

Abstract：

:Little is known about the S100B⁺ lymphocytes, which are unique human peripheral blood lymphocytes (PBL) containing the S100B protein. It has recently been shown that S100B is released from various types of S100B⁺ cells and exhibits varied cytokine-like activities. In this study, we precisely characterized the S100B⁺ lymphocytes of healthy adults with respect to the proportion in the whole PBL, immunophenotypes, function, and their S100B mRNA expression and also evaluated their S100B-releasing activity upon stimulation. S100B⁺ lymphocytes were detected in all individuals examined, and the proportion of S100B⁺ lymphocytes in the whole PBL ranged from 0.42% to 16.15% (mean, 4.21%). In addition, two subtypes of S100B ⁺ lymphocytes, a CTL subtype (CD3⁺ CD8⁺ CD16⁻) and a NK subtype (CD3⁻ CD3⁻ CD16⁺), were detected. The majority of the CTL subtype of S100B⁺ lymphocytes expressed the αβ-T-cell receptor. Surprisingly, S100B mRNA was detected not only in S100B⁺ lymphocytes, but also in every S100B⁺ lymphocytes, although the expression levels of S100B mRNA in S100B⁻ lymphocytes were much lower than those of S100B⁺ lymphocytes. The CTL subtype of S100B⁺ lymphocytes exhibited blastic morphological changes, proliferated and released S100B upon stimulation with phytohemagglutinin. The NK subtype of S100B⁺ lymphocytes exhibited morphological NK activity when cocultivated with NK-sensitive target, K-562 cells. Thus, the CTL subtype of S100B⁺ lymphocytes exhibit the biological characteristics of T cells, while the NK subtype of S100B⁺ lymphocytes exhibit the characteristics of NK cells. These results suggest that S100B⁺ lymphocytes are a particular subtype of cytotoxic lymphocytes that play a unique role in antitumor immunity.

journal_name

Eur J Haematol

journal_title

European journal of haematology

authors

Miki Y,Gion Y,Mukae Y,Hayashi A,Sato H,Yoshino T,Takahashi K

doi

10.1111/ejh.12036

subject

Has Abstract

pub_date

2013-02-01 00:00:00

pages

99-110

issue

eissn

0902-4441

issn

1600-0609

journal_volume

pub_type

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Morphologic, flow cytometric, functional, and molecular analyses of S100B positive lymphocytes, unique cytotoxic lymphocytes containing S100B protein.