Analysis of proliferation marker PCNA showed more cells (both epithelial and stromal) with stained nuclei in the lesion derived from LCS6 variant cells compared to those derived from non-variant cells.
Documented processes of bacterial dispersal from the interior portions of microcolonies would also provide a mechanism by which new genetic variant cells could be released from the biofilm and colonize new environments [36] [39].
The accumulated data suggest an elevated and sensitive autocrine modulation by TGF-alpha and EGFR in immortalising the brain metastatic variant cells that were derived from a human NSCLC squamous cell line.
However, the efficiency of transfection of variant cells is unreliable and ranges from susceptible to resistant.
Tamoxifen resistant variant cells (MCF-7-TamR) derived from MCF-7 cells were continuously cultured in the medium as described above containing additional 10-7 M 4-OH Tam (Sigma-Aldrich, St Louis, MO, USA) for at least six months, along with the parental MCF-7-cells under identical culture conditions except that the control cells were treated with 0.1% ethanol.
This novel property of breast epithelial cells is neither classical senescence, which is defined as an irreversible cell fate, nor the transient senescent arrest described for normal hMECs from which rare variant cells evolve.
Tumours derived from parental and variant cells implanted into nude mice were found to have mean values of extracellular pH (pHe) of 7.03 +/- 0.03 and 7.03 +/- 0.05, respectively, both of which were significantly lower than that of normal muscle (pHe = 7.43 +/- 0.03; P < 0.001).
Bourguignon et al. have previously reported ABCB1 expression in SKOV-3.ipl, a variant cell line established from mouse xenograft, to be increased by HA treatment [ 28].
This is a well-designed study with solid data to support the claim that Fra-1 regulated MMP-1 is involved in the metastatic phenotype of a variant cell line derived from MDA-MB-231 cells.
Cisplatin resistance in Tca/cisplatin, a variant cell line derived from Tca8113, was developed by exposure to cisplatin for 24 months, starting at 1 μM and ending at 10 μM.
