hormone release nonhuman 70 priority journal 66 article 62 controlled study 50 Animals 46 female 36 Female 32 human 30 animal cell 28 male 28 rat 28 signal transduction 28 Rats 26 protein expression 26 animal experiment 24 Humans 22 Male 20 interleukin 6 20 Pituitary Gland 18 Pituitary Neoplasms 18 adenohypophysis 18 gonadorelin 18 gonadotropin 18 hypophysis cell 18 prolactin 18 animal tissue 16 hypophysis 16 regulatory mechanism 16 Tumor Cells, Cultured 14