Importance of Lyt 1+ T-cells in the antitumor activity of an immunomodulator, SSM, extracted from human-type Tubercle bacilli

F. Suzuki, Randy Brutkiewicz, R. B. Pollard

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Abstract

An arabinomannan lipid extracted from Mycobacterium tuberculosis strain Aoyama B (SSM) is an immunopotentiating agent with interferon-inducing and antitumor activities. In the present study, the possible role(s) of various immunocompetent cells on the antitumor effect of SSM was investigated in mice bearing syngeneic (RL♂1 leukemia) and allogeneic (Ehrlich carcinoma) ascites tumors. When Thy 1+ T-cells were depleted from tumor-bearing mice by the administration of monoclonal anti-Thy 1.2 antibody, the protective effect of SSM was eliminated. However, when macrophage (MΦ) and natural killer (NK) cell activities were depleted by treatment with MΦ blockers (trypan blue and carrageenan) or a blocker for NK cells (anti-asialo GM1 antiserum), no alteration of the antitumor activity of SSM was observed. Therefore, T-lymphocytes, but not MΦ or NK cells, were required for the expression of the antitumor efficacy of SSM. The antitumor activity of SSM was also abrogated by Lyt 1+ T-cells being depleted by treatment with monoclonal anti-Lyt 1.2 antibody, whereas the administration of monoclonal anti-Lyt 2.2 antibody had no effect on the antitumor activity. Independent of MΦ, NK cells, or Lyt 2+ T-cells, Lyt 1+ T-lymphocytes appear to play an important role in the expression of the antitumor effects of SSM.

Original languageEnglish (US)
Pages (from-to)441-447
Number of pages7
JournalJournal of the National Cancer Institute
Volume77
Issue number2
StatePublished - 1986
Externally publishedYes

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Immunologic Factors
Bacillus
Natural Killer Cells
T-Lymphocytes
Ehrlich Tumor Carcinoma
Trypan Blue
Carrageenan
Mycobacterium tuberculosis
Interferons
Immune Sera
Leukemia
Macrophages
Carcinoma
Lipids
Neoplasms
Lyt antibodies

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

Cite this

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title = "Importance of Lyt 1+ T-cells in the antitumor activity of an immunomodulator, SSM, extracted from human-type Tubercle bacilli",
abstract = "An arabinomannan lipid extracted from Mycobacterium tuberculosis strain Aoyama B (SSM) is an immunopotentiating agent with interferon-inducing and antitumor activities. In the present study, the possible role(s) of various immunocompetent cells on the antitumor effect of SSM was investigated in mice bearing syngeneic (RL♂1 leukemia) and allogeneic (Ehrlich carcinoma) ascites tumors. When Thy 1+ T-cells were depleted from tumor-bearing mice by the administration of monoclonal anti-Thy 1.2 antibody, the protective effect of SSM was eliminated. However, when macrophage (MΦ) and natural killer (NK) cell activities were depleted by treatment with MΦ blockers (trypan blue and carrageenan) or a blocker for NK cells (anti-asialo GM1 antiserum), no alteration of the antitumor activity of SSM was observed. Therefore, T-lymphocytes, but not MΦ or NK cells, were required for the expression of the antitumor efficacy of SSM. The antitumor activity of SSM was also abrogated by Lyt 1+ T-cells being depleted by treatment with monoclonal anti-Lyt 1.2 antibody, whereas the administration of monoclonal anti-Lyt 2.2 antibody had no effect on the antitumor activity. Independent of MΦ, NK cells, or Lyt 2+ T-cells, Lyt 1+ T-lymphocytes appear to play an important role in the expression of the antitumor effects of SSM.",
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T1 - Importance of Lyt 1+ T-cells in the antitumor activity of an immunomodulator, SSM, extracted from human-type Tubercle bacilli

AU - Suzuki, F.

AU - Brutkiewicz, Randy

AU - Pollard, R. B.

PY - 1986

Y1 - 1986

N2 - An arabinomannan lipid extracted from Mycobacterium tuberculosis strain Aoyama B (SSM) is an immunopotentiating agent with interferon-inducing and antitumor activities. In the present study, the possible role(s) of various immunocompetent cells on the antitumor effect of SSM was investigated in mice bearing syngeneic (RL♂1 leukemia) and allogeneic (Ehrlich carcinoma) ascites tumors. When Thy 1+ T-cells were depleted from tumor-bearing mice by the administration of monoclonal anti-Thy 1.2 antibody, the protective effect of SSM was eliminated. However, when macrophage (MΦ) and natural killer (NK) cell activities were depleted by treatment with MΦ blockers (trypan blue and carrageenan) or a blocker for NK cells (anti-asialo GM1 antiserum), no alteration of the antitumor activity of SSM was observed. Therefore, T-lymphocytes, but not MΦ or NK cells, were required for the expression of the antitumor efficacy of SSM. The antitumor activity of SSM was also abrogated by Lyt 1+ T-cells being depleted by treatment with monoclonal anti-Lyt 1.2 antibody, whereas the administration of monoclonal anti-Lyt 2.2 antibody had no effect on the antitumor activity. Independent of MΦ, NK cells, or Lyt 2+ T-cells, Lyt 1+ T-lymphocytes appear to play an important role in the expression of the antitumor effects of SSM.

AB - An arabinomannan lipid extracted from Mycobacterium tuberculosis strain Aoyama B (SSM) is an immunopotentiating agent with interferon-inducing and antitumor activities. In the present study, the possible role(s) of various immunocompetent cells on the antitumor effect of SSM was investigated in mice bearing syngeneic (RL♂1 leukemia) and allogeneic (Ehrlich carcinoma) ascites tumors. When Thy 1+ T-cells were depleted from tumor-bearing mice by the administration of monoclonal anti-Thy 1.2 antibody, the protective effect of SSM was eliminated. However, when macrophage (MΦ) and natural killer (NK) cell activities were depleted by treatment with MΦ blockers (trypan blue and carrageenan) or a blocker for NK cells (anti-asialo GM1 antiserum), no alteration of the antitumor activity of SSM was observed. Therefore, T-lymphocytes, but not MΦ or NK cells, were required for the expression of the antitumor efficacy of SSM. The antitumor activity of SSM was also abrogated by Lyt 1+ T-cells being depleted by treatment with monoclonal anti-Lyt 1.2 antibody, whereas the administration of monoclonal anti-Lyt 2.2 antibody had no effect on the antitumor activity. Independent of MΦ, NK cells, or Lyt 2+ T-cells, Lyt 1+ T-lymphocytes appear to play an important role in the expression of the antitumor effects of SSM.

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