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Epidermal growth factor (EGF) directly enhanced luteinizing hormone (LH) release from dispersed rat pituitary cells in monolayer cultures as well as in superfusion columns. This 2.3-fold stimulatory effect was dose and time dependent and was also reconfirmed in a superfusion system. Retinal, a protein kinase C inhibitor, counteracted the EGF effect only partially. Further experiments were therefore carried out to investigate alternate EGF mechanisms. Nordihydroguaiaretic acid and chloroquine suppressed the stimulatory effect of EGF in a dose-dependent manner. Moreover, EGF (10(-7) M) stimulated [3H]arachidonate release from pre-labelled rat pituitary cells. This indicates that phospholipase A2 and arachidonic acid may be involved in EGF action on LH release from rat pituicytes.
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