Using line RX1, we then visualized the heterogeneity by immunocytochemistry and found that typically, ∼5 15% (occasionally up to 25%) of rat cells expressed Oct4 highly while the remaining cells exhibited very low but detectable amounts of Oct4 (Fig. 3A).
In control conditions, 26% of rat cells expressed GalC, and 67% were labelled with A2B5, as observed in previous studies (Feigenson et al., 2009).
Crisis was also observed after >40 cell doublings of the naked mole-rat cells expressing an oncogene.
Transplantation into the subretinal space of rats of 1 × 10 rat RPE cells, expressing 2 ng rPEDF/day in vitro, resulted in a constant level of rPEDF of 0.72 0.84 ng rPEDF in the eye indicating that the subretinal environment supports the expression of the PEDF gene integrated into the RPE cell's genome.
Resnicoff M, Sell C, Rubini M, Coppola D, Ambrose D, Baserga R, Rubin R (1994) Rat glioblastoma cells expressing an antisense RNA to the insulin-like growth factor-1 (IGF-1) receptor are nontumorigenic and induce regression of wild-type tumors.
Rat Schwann cells expressing SV40LT proliferate in the absence of mitogens but retain other cell-cycle checkpoints such as anchorage dependence and contact inhibition of proliferation.
As negative control, we used KNRK cells (Kirsten murine sarcoma virus transformed Normal Rat Kidney cells) expressing the substance-P receptor.
B103 rat neuroblastoma cells expressing αS were routinely cultured as previously described.
Thus, we next confirmed the effects of L-arginine on insulin secretion in primary rat liver cells expressing human insulin.
We found that insulin secretion in primary rat liver cells expressing the transcription factors was only 4% of that observed in primary hepatocytes expressing human insulin (Additional File 5B).
As observed with the Hepa1-6 celineine, secretion of insulin was more than 3-fold higher when primary rat liver cells expressing human insulin were incubated with 1 mM glucose in the presence of 20 mM L-arginine (Fig. 6A).
