Nonspecific immunoprotection against Rous sarcoma tumor in chicks

Area of Science:

• Immunology
• Oncology
• Microbiology

Background:

• Rous Sarcoma Virus (RSV) induces tumors in chicks, posing a significant challenge in avian research.
• Exploring immunomodulatory agents is crucial for developing novel cancer prevention strategies.

Purpose of the Study:

• To evaluate the efficacy of an enzyme-treated preparation of Mycobacterium phlei (NSI) in preventing RSV-induced tumors in chicks.
• To investigate the immunomodulatory effects of NSI on cell-mediated immune responses.

Main Methods:

• Intramuscular administration of NSI to chicks followed by challenge with Rous Sarcoma Virus.
• Assessment of tumor incidence and growth inhibition at various time points post-inoculation.
• Evaluation of cell-mediated immune response to specific and non-specific Rous sarcoma antigens.

Main Results:

• NSI administration provided significant protection against RSV-induced tumors, with protection rates of 35.4%, 24.1%, and 21.2% at 10, 20, and 30 days post-inoculation, respectively.
• NSI exhibited significant tumor growth inhibitory activity (P < 0.01) and tumorostatic activity (P < 0.05) via both systemic and intralesional administration.
• NSI effectively stimulated cell-mediated immune responses against Rous sarcoma antigens.

Conclusions:

• NSI possesses significant immunopreventive activity against Rous sarcoma tumors in chicks.
• The protective effect of NSI is mediated by the stimulation of cell-mediated immunity.
• NSI represents a potential immunotherapeutic agent for preventing virus-induced tumors.