Abstract:
:Fibrates belong to a group of ligands of peroxisome proliferator-activated receptor alpha (PPARα), which play a role in the regulation of CYP epoxygenases and soluble epoxide hydrolase (sEH), key enzymes in the metabolism of biologically highly active epoxyeicosatrienoic acids (EETs). We demonstrated that low doses of fibrates stimulate proliferation of the MCF7 cell line, while high doses suppress it. The increase in cell proliferation was accompanied by an increase in CYP epoxygenases and decrease in sEH levels. The overall level of PPARα remained same after low-dose fibrate stimulation; however, there was a significant shift of the receptor to the cell nucleus. PPARα expression was further demonstrated by immunohistochemistry in both carcinoma and healthy breast tissue samples both in the cytoplasm and in the nuclei. We have also observed higher nuclear PPARα positivity in tumor tissues. Although our results obtained for MCF7 cells suggest the potential role of PPARα in cell proliferation, we did not find an association between nuclear localization of PPARα and the expression of proliferation marker Ki-67 in tumor tissues. The exact role of PPARα in carcinogenesis still remains unclear.
journal_name
Med Mol Morpholjournal_title
Medical molecular morphologyauthors
Tauber Z,Koleckova M,Cizkova Kdoi
10.1007/s00795-019-00240-7subject
Has Abstractpub_date
2020-09-01 00:00:00pages
141-148issue
3eissn
1860-1480issn
1860-1499pii
10.1007/s00795-019-00240-7journal_volume
53pub_type
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