CHO cells that express human LH-RH receptor

Disclosed are CHO cells which are capable of continued production of human LH-RH receptor proteins, or cell membrane fractions thereof; recombinant human LH-RH receptor proteins or partial peptides thereof; methods for screening compounds which have affinity for an LH-RH receptor by contacting the compound with the CHO cells or the cell membrane fractions thereof, or the recombinant human LH-RH receptor proteins or the partial peptides thereof; kits for screening them; the compounds which have affinity for the LH-RH receptor obtained by methods for the screening or kits for the screening; and pharmaceutical compositions containing the compound, thereby being able to early provide prophylactic or therapeutic compositions, for example, for prostate cancer, uterine cancer, breast cancer, a pituitary tumor, endometriosis, hysteromyoma or precocious puberty.They are also useful as a pregnancy controlling composition such as contraceptive or a menstrual cycle controlling composition.