Kabushiki Kaisha Hayashibara Seibutsu Kagaku Kenkyujo

Other

Iwao Okamoto

Masashi Kurimoto

Kozo Yamamoto

Keizo Kohno

Osamu Sano

Norie Arai

It is intended to provide an anti-allergic agent, which efficaciously relieves symptoms accompanying an allergic disease without causing any serious side effect. This object is achieved by providing an anti-allergic agent which contains, as an effective ingredient, proteins collected from royal jelly or purified royal jelly, or royal jelly or purified royal jelly containing the proteins.

Antiallergic agent

Disclosed are created stable polypeptides which are capable of inducing the production of interferon-gamma by immunocompetent cells. The present polypeptides contain specific amino acid sequences usually derived from the wild-type polypeptides, being capable of the production of interferon-gamma, by replacing the cysteine(s) with different amino acid(s). The present polypeptides possess a stability and an activity of inducing the production of IFN-&#x3b3; by immunocompetent cells, both of which are significantly higher than those of the wild-type polypeptides. In addition to the activity, the present polypeptides can exhibit remarkable activities of inducing the formation of killer cells and enhancing thier cytotoxicities. The present polypeptides are easily obtainable by the process according to the present invention using recombinant DNA techniques. Thus the present polypeptides are useful for agents to treat and/or prevent susceptive diseases such as viral diseases, infections, malignant tumors, and immunopathies.

DNA encoding loypeptides having interferon-&#x3b3; inducing activity

Disclosed are created stable polypeptides which are capable of inducing the production of interferon-gamma by immunocompetent cells. The present polypeptides contain specific amino acid sequences usually derived from the wild-type polypeptides, being capable of the production of interferon-gamma, by replacing the cysteine(s) with different amino acid(s). The present polypeptides possess a stability and an activity of inducing the production of IFN-&ggr; by immunocompetent cells, both of which are significantly higher than those of the wild-type polypeptides. In addition to the activity, the present polypeptides can exhibit remarkable activities of inducing the formation of killer cells and enhancing thier cytotoxicities. The present polypeptides are easily obtainable by the process according to the present invention using recombinant DNA techniques. Thus the present polypeptides are useful for agents to treat and/or prevent susceptive diseases such as viral diseases, infections, malignant tumors, and immunopathies.

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Okayama, Japan

Iwao Okamoto