- Genes & Diseases,Volume 6, Issue 2,2014, Pages 159-166
- Forskolin and Phorbol 12-myristate 13-acetate modulates the expression pattern of AP-1 factors and cell cycle regulators in estrogen-responsive MCF-7 cells
- R.L.Babu1, M.Naveen Kumar2, Rajeshwari H.Patil3, K.M.Kiran Kumar4, S. ChidanandaSharma5, K.S.Devaraju6, Govindarajan T.Ramesh7
- 1.Department of Bioinformatics and Biotechnology, Akkamahadevi Women's University, Jnanashakthi Campus, Vijayapura, 586 108, Karnataka, India;2.Department of Microbiology and Biotechnology, Bangalore University, Jnana Bharathi, Bengaluru, 560 056, Karnataka, India;3.Department of Microbiology and Biotechnology, Bangalore University, Jnana Bharathi, Bengaluru, 560 057, Karnataka, India;4.Department of Microbiology and Biotechnology, Bangalore University, Jnana Bharathi, Bengaluru, 560 058, Karnataka, India;5.Department of Microbiology and Biotechnology, Bangalore University, Jnana Bharathi, Bengaluru, 560 059, Karnataka, India;6.Department of Biochemistry, Karnatak University, Dharwad, 580003, Karnataka, India;7.Department of Biology, Center for Biotechnology and Biomedical Sciences, Norfolk State University, Norfolk, VA, USA
Activator protein-1 (AP-1) transcription factor is a key component of many signal transduction pathways involved in the regulation of cellular processes and controls rapid responses of mammalian cells when exposed to the variety of stimulus. The phorbol 12-myristate 13-acetate and Forskolin (Fo) are well-known kinase activators/stimulators of Protein Kinase C (PKC) and Protein Kinase A (PKA) respectively. Importantly, these kinases are found to be present in transitional points of many cell signaling pathways, especially those involved in proliferation. The stimulating effect of PKC and PKA on the expression of AP-1 factors in MCF-7 breast cell proliferation is not well characterized. Hence, the role of PKC by PMA treatment and the role of PKA by using Fo in MCF-7 cells is investigated. Where, cells treated with PMA showed increased cell proliferation, while Fo had no effect, but inhibited the PMA induced proliferation. The RT-PCR results showed the PMA induced c-Jun, c-Fos and Fra-1 expressions compared to control and Fo. However, Fo in combination with PMA, inhibit the PMA induced above mRNA expressions where Fo alone has no effect. Western blot studies validated the c-Jun expressions in PMA treated MCF-7 cells. Further, PMA increases the mRNA expression of Cyclin-E1, Cyclin-D1, and CDK-4, whereas Fo decreases their expressions. Thus, mitogenic effect of PMA and inhibitory action of Fo on MCF-7 cells is probably enhanced via activation of AP-1 factors and concomitant action of cell cycleregulators in the downstream singling cascade.
AP-1 transcription factorCell cycleForskolinMCF-7 cellsPhorbol esters
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