Abstract
Streptococcal preparation OK-432 is a bacterial immunopotentiator extensively used in Japan for adjuvant cancer therapy. Using C3H/He mice bearing MH-134 tumour cells, cytokine inductions of tumour necrosis factor-alpha, interleukin 1 beta, interleukin 6 and interferon-gamma were determined in spleen and tumour tissues by reverse transcriptase-polymerase chain reaction analysis. No significant induction of cytokine mRNA was observed after subcutaneous administration of OK-432 (OK-432, s.c.) or after intratumoural injection of IFN-gamma (IFN-gamma, i.t.), compared with controls, either in spleen or tumour tissues. In contrast, subcutaneous administration of OK-432 followed by intratumoural OK-432 injection (OK-432, s.c. + i.t.) was found to induce some cytokine mRNAs significantly. The mRNA levels of tumour necrosis factor alpha and interferon-gamma in spleen tissue and those of interleukin 1 beta and interferon-gamma in tumour tissues were significantly elevated in mice with OK-432, s.c. + i.t. treatment compared with controls. These results suggest that treatment with OK-432, s.c. + i.t. effectively induced splenic antitumour immunity as well as local immunity against tumour cells.
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