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Antitumour activity of adenovirus-12 structural proteins against Moloney sarcoma tumours in mice
Abstract:
When purified fibre and hexon proteins of adenovirus 12 were given intramuscularly to 4-week-old BALB/c mice (250-300 mug/mouse) 2 h prior to inoculation with mouse sarcoma virus (0.05 ml of 10(4) FFU/ml) at the same site, significant suppression of tumour growth (P less than 0.001), and rapid regression in tumour size (P less than 0.001) were noted. As a rule, the survival rate in treated mice was also significantly higher than in untreated mice. Furthermore, the disease process in treated mice as compared to untreated mice was far less extensive as judged by the scarcity of sarcoma lesions on the spleens. Preliminary evidence suggested that treatment with fibre could lead to increased cellular immunity in mice. Whether this may be a secondary consequence of events whereby fibre inhibited tumour growth rather than first order mechanism of the inhibition is not known.
Insights
Adenovirus 12 fiber and hexon proteins significantly suppressed mouse sarcoma virus tumor growth and increased survival rates in BALB/c mice. Preliminary data suggest fiber treatment may enhance cellular immunity, though the exact mechanism requires further investigation.
Area of Science:
- Oncology
- Virology
- Immunology
Background:
- Mouse sarcoma virus is a potent oncogenic agent.
- Adenovirus 12 proteins, specifically fiber and hexon, are being investigated for their biological effects.
- Understanding host-pathogen interactions is crucial for developing novel cancer therapies.
Purpose of the Study:
- To evaluate the effect of adenovirus 12 fiber and hexon proteins on mouse sarcoma virus-induced tumor growth.
- To assess the impact of these proteins on the survival rate and disease progression in mice.
- To explore potential immunomodulatory effects of the treatment.
Main Methods:
- BALB/c mice were administered purified adenovirus 12 fiber and hexon proteins intramuscularly.
- Mice were subsequently inoculated with mouse sarcoma virus at the same site.
- Tumor growth, regression, survival rates, and spleen lesion development were monitored and compared between treated and untreated groups.
Main Results:
- Significant suppression of tumor growth (P < 0.001) and rapid tumor regression (P < 0.001) were observed in treated mice.
- Treated mice exhibited significantly higher survival rates compared to controls.
- Reduced extent of disease, indicated by fewer sarcoma lesions on spleens, was noted in the treated group.
Conclusions:
- Adenovirus 12 fiber and hexon proteins demonstrate significant oncostatic and immunomodulatory potential against mouse sarcoma virus.
- Treatment led to improved survival and reduced disease severity in mice.
- Preliminary findings suggest a possible role in enhancing cellular immunity, warranting further mechanistic studies.