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Background Anaerobic Clostridial spores (CG) cause significant oncolysis in hypoxic tumour microenvironment and result in tumour regression in both animal models and clinical trials. The immune mediated response plays a critical role in the antitumour effect by the anaerobic spore treatment.Method Human papillomavirus 16 E6/E7 transformed TC-1 tumour bearing mice were intravenously administered with low (1 × 10 8 CFU/kg) or high dosage (3 × 10 8 CFU/kg) of Derivative Clostridial spore (DCG).Results Intravenous administration of the derivative of Clostridial ghonii (DCG) spores leads to both tumour and systemic inflammatory responses characterized by increased IFN γ /IL-9 secreting T cells in the spleen and the tumour. Low numbers of antigen specific T cells (<20/10 6 spleen cells) in the spleen of the tumour bearing mice are also detected after intravenous DCG delivery. Interestingly, our results showed that a mixed IL-9/IFN γ secreting T cell response was induced when the tumour bearing mice received a low dose of DCG spore (1 × 10 8 CFU/kg), while a strong IFN γ response was elicited with a high dosage of DCG spore (3 × 10 8 CFU/kg).Conclusion The dosage of DCG spore will determine the types of the DCG induced immune responses.

biomed research international

The Dosage of the Derivative ofClostridium Ghonii(DCG) Spores Dictates Whether an IFNγ/IL-9 or a Strong IFNγResponse Is Elicited in TC-1 Tumour Bearing Mice