Extracts of Larix Leptolepis effectively augments the generation of tumor antigen-specific cytotoxic T lymphocytes via activation of dendritic cells in TLR-2 and TLR-4-dependent manner

Shin ichi Koizumi, Kazutaka Masuko, Daiko Wakita, Sachi Tanaka, Rieko Mitamura, Yoshihiro Kato, Homare Tabata, Masahiro Nakahara, Hidemitsu Kitamura, Takashi Nishimura

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Type-1 immunity plays a crucial role in host defense against various tumors and infectious diseases. Here, we first demonstrated that extract of Larix Leptolepis (ELL), one of the most popular timbers at Hokkaido area in Japan, strongly activated Type-1 immunity. ELL induced production of Type-1 cytokines such as IL-12 and TNF-α from bone marrow-derived dendritic cells (BMDCs) in TLR2- and TLR4-dependent manner and remarkably up-regulated the expression of MHC and co-stimulatory molecules. In addition, antigen-specific CTLs were significantly augmented by the combined administration of ELL, antigen and BMDCs. Finally, we revealed that combination therapy using ELL, antigen and BMDCs significantly inhibited the growth of established tumor in mouse model. Thus, these findings suggested that ELL would be a novel adjuvant for inducing an activation of Type-1-dependent immunity including activation of BMDCs and induction of tumor-specific CTLs, which is applicable to the therapy of cancer and infectious diseases.

Original languageEnglish
Pages (from-to)153-161
Number of pages9
JournalCellular Immunology
Volume276
Issue number1-2
DOIs
Publication statusPublished - Mar 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Immunology

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