Throughput expression of multiple G-protein coupled receptors for HIV infection in choriocarcinoma cells, trophoblasts, and breast milk cells.

The chemokine receptors, which belong to G-protein coupled receptors (GPCRs) and become co-receptors when HIV enters the cell, have been mentioned in recent research. Numerous studies have reported that the cellular mechanism of HIV crossing the placental barrier is still not totally understood. This study was conducted to investigate whether the mRNAs of nineteen typs of GPCRs and CD4 were expressed in choriocarcinoma cell lines, trophoblasts, and breast milk cells by using RT-PCR. It was found that the expression of GPCRs varied in different cell lines. Of note is that CD4 could not be expressed in either choriocarcinoma cells or trophoblasts. It was noteworthy that mRNAs of multiple GPCRs were identified in choriocarcinoma cells, trophoblasts, and breast milk cells for the first time. The expression amounts of these mRNAs were further measured by quantitative RT-PCR. Interestingly, mRNAs of CCR9/CCR10 were strongly expressed in trophoblasts. This study provided further insights to the cellular mechanism of mother-to-child transmission of HIV.