Transport kinetics of zinc, copper, selenium, and iron in perfused human placental lobule in vitro.

Abstract:

:Transport characteristics of essential trace elements as zinc, copper, selenium and iron have been studied in maternal-fetal direction in normal pregnancies, using in vitro perfusion of human placental lobules. Solutions of trace elements corresponding to twice the physiological concentrations were injected (100 microl bolus) into the maternal arterial perfusate. Serial perfusate samples were collected every 30 sec from venous outflows for a study period of 5 min. Concentrations of these trace elements and their transport kinetics were determined. Transport fractions (TF) of zinc, copper, selenium and iron averaged 0.21, 0.49, 0.55 and 0.10% of maternal load respectively. Other parameters such as area under the curve, clearance, elimination constant, absorption and elimination rates showed some significant differences between the various elements. Copper and selenium appear to be transported passively in maternal-fetal direction, while for iron and zinc, role of active transport for transfer across the human placental membrane cannot be discounted. We speculate that alterations in copper: zinc TR50 (transport rate for 50% efflux) and TF ratios could serve as useful indicators for assessing placental transport status of these essential elements in complicated pregnancy states.

journal_name

Mol Cell Biochem

authors

Nandakumaran M,Dashti HM,Al-Saleh E,Al-Zaid NS

doi

10.1023/a:1025565720489

keywords:

subject

Has Abstract

pub_date

2003-10-01 00:00:00

pages

91-6

issue

1-2

eissn

0300-8177

issn

1573-4919

journal_volume

252

pub_type

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