Objective:Polyamines act as endogenous modulations of cell function and excitability. There are no data in relation to their effects on the human fetoplacental circulation. The aim of this study was to investigate the effects of the polyamines, spermine, and spermidine on human umbilical artery resistance in vitro.
Methods:Isometric tension recordings were performed under physiologic conditions on human umbilical arterial rings (n = 12). The in vitro effects of spermine and sperimidine (at concentrations ranging between 10-9 M to 10-3 M) were measured, and compared with those measured in vehicle control experiments. The maximal inhibition (MMI) at the highest concentration and the pD2(-log EC50 values for each compound were calculated and compared.
Results:Spermine and spermidine exerted a potent relaxant effect on human umbilical arterial tone in comparison to vehicle control experiments. The MMI ± SEM for spermine was 18.41 ± 1.437% (n = 6; P < .001) and for sperimidine was 38.31 ± 3.572% (n = 6, P < .001). There was no different observed between the pD2 ± SEM value for spermine (5.78 ± 1.54, n = 6) and spermidine (6.27 ± 0.85; n = 6) (P = .517).
Conclusion:The polyamines spermine and spermidine exert a potent relaxant effect on human umbilical artery tone suggestive of an endogenous role for these compounds in vasomotor regulation of the fetoplacental circulation.
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