Abstract:The authors have already shown that A60, the thermostable macromolecular antigen complex of Mycobacterium bovis BCG, induced resistance to tumour challenge in several murine systems. In the present work, the authors provided evidence that activated macrophages played a major role, and cytolytic T lymphocytes a minor one, in both in vivo and in vitro A60-promoted cancer cell cytolysis. To identify the types of immunocompetent cells involved in this protective effect, macrophages and T lymphocytes from A60-prime… Show more
“…All the specific functions of activated MΦ, be it tumour cytolysis or production of oxygen and nitrogen radicals, were reduced in MΦ confronted with cancer cells. However, in agreement with the cited adoptive transfer experiments (inability of MΦ alone to protect irradiated hosts against tumour challenge; Table 2) [ 79], TLs from A60‐primed mice, after pre‐incubation with EMT 6 tumour cells in vitro , displayed a reduced ability to activate Mφ ( Fig. 6C) [ 80].…”
Section: The Inhibitory Effects Of Neoplasia On the Immune Systemsupporting
confidence: 83%
“…Irradiated reference mice, receiving EMT 6 cells and lymphocytes from naive mice, develop lethal tumours within 1 month. In contrast, irradiated mice injected with activated lymphocytes from A60‐primed mice, but not those receiving MΦ alone, are protected against a subsequent tumour challenge [ 79]. It is thus evident that MΦ, although the main effectors of tumour cytolysis, need a continuous activation by stimulated specific lymphocytes.…”
Section: The Prophylactic Action Of Tma Complexes Against Experimentamentioning
confidence: 99%
“…The demonstration that anti‐tuberculous immunity is transferred by blood cells and not by serum [ 17–19] bears a strong similarity with the adoptive transfer of A60‐activated competent cells for protection against tumour challenge ( Table 2) [ 79].…”
Section: Immunological Basis Of Anti‐tuberculous Immunity and Anti‐tumentioning
Background Bacille Calmette-Guérin (BCG), an attenuated strain of tuberculous bacillus, is the source of vaccines providing unclear and variable protection against tuberculosis (TB) and cancer. Thermostable macromolecular antigens (TMAs) are major mycobacterial complexes immunodominant in disease. A60 (TMA complex of BCG) protects mice against TB development, via T lymphocyte (TL)-mediated macrophage (MF) activation, halting intracellular mycobacterial replication. In most A60-primed mice, cytolytic TLs and MF infiltrate cancer tissue, resulting in 80-100% rejection. Adoptive TL transfer is indispensable for MF-dependent tumour cell inactivation via oxygen and nitrogen radicals. Neoplasm development induces immune anergy with depletion of A60-specific TL and activated MF. A60 protects mice against TB and cancer by inducing the synthesis of three lymphokines: interleukin 2 (IL-2), interferon gamma (IFN-g) and tumour necrosis factor alpha (TNF-a). Tumour cells prevent A60-dependent synthesis of these lymphokines in vivo and in vitro.
“…All the specific functions of activated MΦ, be it tumour cytolysis or production of oxygen and nitrogen radicals, were reduced in MΦ confronted with cancer cells. However, in agreement with the cited adoptive transfer experiments (inability of MΦ alone to protect irradiated hosts against tumour challenge; Table 2) [ 79], TLs from A60‐primed mice, after pre‐incubation with EMT 6 tumour cells in vitro , displayed a reduced ability to activate Mφ ( Fig. 6C) [ 80].…”
Section: The Inhibitory Effects Of Neoplasia On the Immune Systemsupporting
confidence: 83%
“…Irradiated reference mice, receiving EMT 6 cells and lymphocytes from naive mice, develop lethal tumours within 1 month. In contrast, irradiated mice injected with activated lymphocytes from A60‐primed mice, but not those receiving MΦ alone, are protected against a subsequent tumour challenge [ 79]. It is thus evident that MΦ, although the main effectors of tumour cytolysis, need a continuous activation by stimulated specific lymphocytes.…”
Section: The Prophylactic Action Of Tma Complexes Against Experimentamentioning
confidence: 99%
“…The demonstration that anti‐tuberculous immunity is transferred by blood cells and not by serum [ 17–19] bears a strong similarity with the adoptive transfer of A60‐activated competent cells for protection against tumour challenge ( Table 2) [ 79].…”
Section: Immunological Basis Of Anti‐tuberculous Immunity and Anti‐tumentioning
Background Bacille Calmette-Guérin (BCG), an attenuated strain of tuberculous bacillus, is the source of vaccines providing unclear and variable protection against tuberculosis (TB) and cancer. Thermostable macromolecular antigens (TMAs) are major mycobacterial complexes immunodominant in disease. A60 (TMA complex of BCG) protects mice against TB development, via T lymphocyte (TL)-mediated macrophage (MF) activation, halting intracellular mycobacterial replication. In most A60-primed mice, cytolytic TLs and MF infiltrate cancer tissue, resulting in 80-100% rejection. Adoptive TL transfer is indispensable for MF-dependent tumour cell inactivation via oxygen and nitrogen radicals. Neoplasm development induces immune anergy with depletion of A60-specific TL and activated MF. A60 protects mice against TB and cancer by inducing the synthesis of three lymphokines: interleukin 2 (IL-2), interferon gamma (IFN-g) and tumour necrosis factor alpha (TNF-a). Tumour cells prevent A60-dependent synthesis of these lymphokines in vivo and in vitro.
The innate immune response, which depends on so-called pattern-recognition receptors (PRRs) is an evolutionarily old immune response able to elicit a defensive response against a vast array of pathogens. The purpose of this review is to revisit the role of innate immunity in breast carcinoma from the oldest therapeutic approach using bacillus Calmette-Guerin to the recent findings on the manipulation of the PRR pathways with unmethylated cytosine-guanosine dinucleotides (CpG motifs). Encouraging results have been obtained in prevention and local treatment of murine mammary tumors using tumor cells engineered to express stably mycobacterial antigens or directly using CpG-containing oligonucleotides. The experimental findings raise the possibility of successful anti-tumor management through stimulation of innate immunity in women at high risk of developing breast cancer and in breast cancer patients with reasonable immunological performance and low tumor load.
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