Lin28a ACTIVATOR AND USE THEREFOR

This Lin28a activator includes, as an active ingredient, a polysaccharide which contains at least one substance selected from the group consisting of ribose, xylose, and derivatives of each. A monocyte dedifferentiation inducer includes, as active ingredients, a macrophage colony-stimulating factor and a polysaccharide which contains at least one substance selected from the group consisting of ribose, xylose, and derivatives of each. A therapeutic agent against diseases relating to damage in cells, tissues, or organs includes, as an active ingredient, a polysaccharide which contains at least one substance selected from the group consisting of ribose, xylose, and derivatives of each. A food or beverage product for preventing or alleviating diseases relating to damage in cells, tissues, or organs includes a polysaccharide which contains at least one substance selected from the group consisting of ribose, xylose, and derivatives of each. A cosmetic product includes a polysaccharide which contains at least one substance selected from the group consisting of ribose, xylose, and derivatives of each.