Interleukin-8 gene and protein expression are up-regulated by interleukin-1β in normal human ovarian cells and a granulosa tumor cell line

Abstract

Objective To evaluate the expression, regulation, and role of interleukin (IL)-8 in human ovary. Design Prospective study. Setting University hospital. Patient(s) Sixteen premenopausal women. Intervention(s) Follicular fluid and granulosa lutein cells (GLCs) were collected during IVF cycles. Ovarian stromal and theca cells were obtained from women underwent surgery. KGN cells, the human granulosa cell tumor cell line, were also used. Main outcome measure(s) The levels of IL-8 and IL-1β in follicular fluid and IL-8 protein production were determined using ELISA. Interleukin-8 and IL-8 receptor gene expression in ovarian cells and the effect of IL-8 on the proliferation of stromal cells were determined. The expression of pIκB was evaluated by Western blot, and the effect of NF-κB inhibitor APDC was examined by Northern blot analysis and ELISA in KGN cells. Result(s) The levels of IL-8 and IL-1β in follicular fluid; each concentration and the volume showed a positive correlation. Reverse transcription polymerase chain reaction showed the presence of IL-8 mRNA in all ovarian cells. In contrast, IL-8 receptor mRNA was only detected in stromal cells. The expression of IL-8 in GLCs and KGN cells was increased by addition of IL-1β and TNFα. Interleukin-8 increased the proliferation of ovarian stromal cells. The expression of pIκB in KGN cells was induced by IL-1β, and the effects were reduced by APDC. Conclusion(s) Interleukin 8 induced by IL-1β via activation of NF-κB in granulosa cells may have a role in the periovulatory period of follicular maturation.