Figure 6. Nitric oxide production is responsible for the down-regulation of 1B DMT1.
(A) RT-PCR was done using total RNA from undifferentiated cells (UD), cells 18 h after removal of RA (day5) and cells after removal of RA treated with 500 μM L-NMMA (NMMA) for 18 h. The results showed that the expression of the 1B isoform was rescued in cells treated with the NOS inhibitor L-NMMA. No change was seen in 1A isoform mRNA. (B) RT-PCR was done using total RNA from cells during differentiation. The results show increased expression of neuronal NOS 10 h after removal of RA.