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Year : 1999  |  Volume : 31  |  Issue : 5  |  Page : 340-344

Calcium entry into myometrial cells is inhibited by tamoxifen and 4-monohydroxytamoxifen

Correspondence Address:
M J Wilkinson

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Source of Support: None, Conflict of Interest: None

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Objectives: To investigate whether tamoxifen, oestradiol and 4-monohydroxytamoxifen inhibit entry of calcium into rat myometrium. Methods: Pieces of myometrium were incubated in media containing tamoxifen, oestradiol or 4- monohydroxytamoxifen, in the presence or absence of known myometrial spasmogens (80 mM KCl or 1.28 nM oxytocin). Following incubation the tissues were dried and the uptake of 45 Ca 2+ measured. Results: OH-tamoxifen inhibited the entry of 45 Ca 2+ entry in both normal (5.9 mM KCl) and high potassium (80 mM KCl) media while tamoxifen and oestradiol inhibited 45 Ca 2+ entry only in high potassium media. 20 (M 17(-oestradiol also inhibited calcium influx in oxytocin (1.28 nM) stimulated tissues, no inhibition was observed with tamoxifen. Conclusions: Tamoxifen and its metabolite, 4-monohydroxytamoxifen (OH-tamoxifen) may obstruct ion-channel, but not receptor, mediated entry of calcium into rat myometrium.


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