Journal of Veterinary Medical Science
Online ISSN : 1347-7439
Print ISSN : 0916-7250
ISSN-L : 0916-7250
In Vitro and In Vivo Studies of the Growth Inhibitory Effect of a Newly Synthesized Peptide, Obiopeptide-1, on Mice-Bearing Methylcholanthrene-Induced Murine Tumours
Haruhisa SAKURAIYasuhiro FUJIIYoshiyuki MAKIIkuo IGARASHIYoshitaka OMATAAtsushi SAITOKenichiro ONONaoyoshi SUZUKI
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1991 Volume 53 Issue 5 Pages 823-831

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Abstract
Novelsynthetic Obiopeptide (Obi-1), Glycil-penta-Glutamate, as an immunoregulator, injected intramuscularly to methylcholanthrene (MC) induced tumour bearing mice at 30-100 μg per mouse weekly, significantly inhibited tumour growth, compared to that of the untreated control. Numbers of mononuclear cells (MNC) in the spleen obtained from Obi-1 treated and untreated mice were reduced to 64% and 10% of the normal levels, respectively. In histopathological findings, variations of MNC in the spleen was observed in colonies of large MNC and lymphocytes in Obi-1 treated red marrow, while untreated one showed only scattered number of smalllymphocytes. A significant O-2 production was noted in monolayers of normal macrophages incubated with 0.5 mg Obi-1/ml for 48 hr. Cytotoxicity of spleen MNC cultured with Obi-1 against MC-tumour, Meth A, P-815 and YAC-1 target cells showed less than 10% cytotoxic activity in almost all experiments.
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© The Japanese Society of Veterinary Science
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