Abstract
While gonadotropin-releasing hormone (GnRH), GnRH-like, or GnRH receptor (GnRH-R) have been reported to exist in several tissues other than brain or anterior pituitary, there is no report concerning GnRH or GnRH-R gene expression in the normal mammary gland. In order to define the production of GnRH as well as GnRH-R in the mammary gland at the molecular level we examined their gene expression in various functional stages of the mouse mammary gland using the reverse transcriptase-polymerase chain reaction (RT-PCR). GnRH mRNA transcripts were found in mouse mammary glands of mid-pregnant, lactating, and 3, 6, 9 days post-lactational mice, whereas GnRH-R mRNA transcripts were not detected in mammary glands of any functional stage. These results suggest a possible biological role of GnRH in mammary gland.
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