Abstract: An object of the present invention is to provide a pharmaceutical preparation that can promote the proliferation of oligodendrocyte precursor cells to effectively prevent or treat a demyelinating disease. FGF21 acts to promote the proliferation of oligodendrocyte precursor cells, and thus, the administration of FGF21, DNA encoding FGF21, an FGF21 production-promoting substance, and/or FGF21-producing cells is effective for preventing or treating a demyelinating disease.

Abstract: An object of the present invention is to provide a hollow fiber membrane with enhanced phosphorus-removing performance without impairing antithrombogenicity in order to inhibit in vivo accumulation of phosphate ions in living body that might cause bone metabolism disorders. The present inventors have found that a hollow fiber membrane having a specific membrane structure and a specific membrane composition possesses a very useful range for inner surface charges of the membrane. More particularly, the inventors have discovered that the above object can be achieved in a limited range in which the zeta potential on the inner surface of a hollow fiber membrane measured under given certain conditions is greater than ?3.0 mV but less than 0 mV. This finding has led to the completion of the present invention.

Abstract: An object of the present invention is to provide a pharmaceutical preparation that can promote the proliferation of oligodendrocyte precursor cells to effectively prevent or treat a demyelinating disease. FGF21 acts to promote the proliferation of oligodendrocyte precursor cells, and thus, the administration of FGF21, DNA encoding FGF21, an FGF21 production-promoting substance, and/or FGF21-producing cells is effective for preventing or treating a demyelinating disease.

Abstract: An object of the present invention is to provide a hollow fiber membrane with enhanced phosphorus-removing performance without impairing antithrombogenicity in order to inhibit in vivo accumulation of phosphate ions in living body that might cause bone metabolism disorders. The present inventors have found that a hollow fiber membrane having a specific membrane structure and a specific membrane composition possesses a very useful range for inner surface charges of the membrane. More particularly, the inventors have discovered that the above object can be achieved in a limited range in which the zeta potential on the inner surface of a hollow fiber membrane measured under given certain conditions is greater than ?3.0 mV but less than 0 mV. This finding has led to the completion of the present invention.