Abstract
Six murine tumors, including ascetic tumors HepA, EC, P388 leukemia, S180 and solid tumor S180, and Lewis lung carcinoma, were employed in this work. The free sialic acid concentrations in both blood and ascites were measured in tumor-bearing mice. The results showed that the content of sialic acids in blood was increased in tumor growth and certain tumor types. Higher sialic acid content was observed in ascites than that present in blood. The influence of antineoplastic agents (vincristine, thiotepa, adriamycin, probimane, cisplatin, oxalysine, cortisone, nitrogen mustard, lycobetaine, Ara-C, harringtonine, and cyclophosphamide) on the content of sialic acids in mice blood bearing solid tumors of either S180 or Lewis lung carcinoma was observed. Different inhibitions of antineoplastic drugs on both tumor growth and serum sialic acid levels in mice bearing tumors were found. Among these antineoplastic drugs, probimane, cisplatin, nitrogen mustard, and lycobetaine were able to decrease the serum sialic acid levels in mice bearing tumors. Since these four antineoplastic drugs are all DNA chelating agents, it was proposed that the inhibition of tumor sialic acids by these drugs might be through the DNA template via two ways. Since we have found no effect of antineoplastic drugs on serum sialic acid levels in normal mice, this suggests that the inhibition of antineoplastic drugs on sialic acids is by tumor involvement.
Highlights
Cancer metastasis is responsible for 90% of all cancer deaths
One of the reasons is the lack of therapeutic targets related to neoplasm metastasis
We previously argued that more therapeutic targets related to neoplasm metastasis should be studied [6], especially the sialic acid pathways [7,8]
Summary
Cancer metastasis is responsible for 90% of all cancer deaths. Current therapeutic approaches to this pathogenesis is unsatisfactory [1, 2]. One of the reasons is the lack of therapeutic targets related to neoplasm metastasis. Cancer metastasis is a long-term cascade in humans and leads to a series of biological, biochemical, and pathophysiological consequences [3,4,5]. We previously argued that more therapeutic targets related to neoplasm metastasis should be studied [6], especially the sialic acid pathways [7,8]. The inhibitions of serum sialic acid levels in mice bearing tumors by antineoplastic drugs are studied
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