Volvariella volvacea lectin activates mouse T lymphocytes by a calcium dependent pathway

S.C.W. Sze, J.C.K. Ho, W.K. Liu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The immunomodulatory lectin, Volvariella volvacea lectin (VVL), isolated from the edible mushroom, Volvariella volvacea, has been shown to stimulate the expression of Th1 cytokines and the proliferative activity of mouse splenocytes (She et al. [1998]: Biochem Biophys Res Comm 247:106–111). In order to elucidate the mechanisms underlying these activities, we conducted a kinetic analysis of the early and late activation markers in mouse T lymphocytes: (1) flow cytometric analysis of calcium influx, (2) induction of activation molecules (CD25 and CD69), (3) expression and DNA-binding activity of the nuclear factor of activated T cells (NFAT), NFκB, and activation protein-1 (AP-1), (4) translational production of cytokines (interleukin-2 (IL-2) and interferon-γ (IFNγ)), and (5) cell proliferation by expression of proliferating cell nuclear antigen (PCNA) and tritiated thymidine incorporation. All results showed that VVL induced a rapid expression of CD69, CD25, NFAT, IL-2, and PCNA in a dose- and time-dependent manner, leading to lymphocyte proliferation. These effects brought about by VVL were more potent than those stimulated by equimolar concentrations of mitogenic lectin, concanavalin A (Con A). Cell activation and proliferation were mediated through a calcium-dependent pathway as demonstrated by a VVL-induced increase of intracellular calcium influx, and a proliferation inhibition by the Ca-dependent phosphatase calcineurin blocker—cyclosporin A (CsA). Taken all data together, VVL is a lectin which activates lymphocyte through successive calcium influx, nuclear localization of NFAT transcription factor, induction of activation markers, CD25 and CD69, intracellular cytokine production, and cell proliferation.
Original languageEnglish
Pages (from-to)1193-1202
Number of pages10
JournalJournal of Cellular Biochemistry
Volume92
Issue number6
Early online date14 Jun 2004
DOIs
Publication statusPublished - 15 Aug 2004
Externally publishedYes

User-Defined Keywords

  • Volvariella volvacea lectin
  • lymphocyte activation
  • calcium influx
  • CD25, CD69, and IL-2
  • NFAT transcription factor
  • flow cytometry

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