Summary
The antitumour activity of C. parvum and its relationship to spleen weight increase have been analysed in a tumour model using syngeneic M4 fibrosarcoma cells. It was found that treatment of C. parvum with low concentrations of periodate (2 mM) produced a minor decrease in the ability to abrogate tumour growth, following intratumour injection, although the capacity to increase spleen weight after IP injection was abolished. Higher concentrations of periodate (20 mM) produced complete inactivation of the bacteria. A phenol extract of C. parvum was weakly active in the intratumour test but amounts up to 1 mg injected IP were unable to increase the spleen weight. The data support the hypothesis that a surface carbohydrate is responsible for the increase in spleen weight. It is suggested that the antitumour activity may reside in a molecule that also reacts with periodate but at a slower rate, perhaps because of a more complex structure or a different location in the cell, for instance in the cytoplasm. The phenol extract was soluble in chloroform and at least two major components were glycolipids, so it is conceivable that a molecule of this type, which could be degraded by periodate, might be responsible for the antitumour activity of C. parvum. The precise biochemical nature of the active component is, as yet, undetermined.
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RIveros-Moreno, V., Niblock, A. Analysis of the effect of periodate oxidation and phenol extraction on the antitumour properties of C. parvum . Cancer Immunol Immunother 8, 265–272 (1980). https://doi.org/10.1007/BF00206046
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DOI: https://doi.org/10.1007/BF00206046