Layer II of placental syncytiotrophoblasts expresses MDR1 and BCRP at the apical membrane in rodents

Tomoya Akashi, Tomohiro Nishimura, Yoshiya Takaki, Masaya Takahashi, Bo Chul Shin, Masatoshi Tomi, Emi Nakashima

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4 Citations (Scopus)


The purpose of this study is to clarify the subcellular localizations of multidrug resistance protein 1 (MDR1)/ABCB1 and breast cancer resistance protein (BCRP)/ABCG2 in the rodent placental SynT bilayer, i.e., a maternal-facing (SynT-I) layer and a fetal-facing (SynT-II) layer. In double immunofluorescence staining, the signals of MDR1 and BCRP appeared midway between the signals of glucose transporter 1 on the apical membrane of SynT-I and the basal plasma membrane of SynT-II, and mostly overlapped with signals of connexin 26, which forms gap junctions between SynT-I and SynT-II. In detail, median intensities (pixels) of the MDR1 and BCRP signals were significantly closer to the fetal circulation as compared to the location of connexin 26 signals. In double in situ hybridization studies, the signals of Mdr1b mRNA mostly overlapped with those of Syncytin-B, a SynT-II marker. In conclusion, MDR1 and BCRP are expressed on apical membranes of the rodent placental SynT-II layer.

Original languageEnglish
Pages (from-to)375-381
Number of pages7
JournalReproductive Toxicology
Publication statusPublished - 2016 Oct 1



  • BCRP
  • MDR1
  • Placental barrier
  • Rodent
  • Syncytiotrophoblast
  • Transporter

ASJC Scopus subject areas

  • Toxicology

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