scholarly journals Uptake of Photosensitizer 2-Devinyl-2-(1-methoxylethyl) Chlorinfin Human Breast Cancer Cells: A Diffusion Kinetics Study

2012 ◽  
Vol 2012 ◽  
pp. 1-8
Author(s):  
Ping Chen ◽  
Feng Zhang ◽  
Lei Zhang ◽  
Song-Cheng Mao ◽  
Lie Lin ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Cancer Cells ◽  
Cellular Uptake ◽  
Human Breast Cancer ◽  
Breast Cancer Cells ◽  
Diffusion Kinetics ◽  
Human Breast Cancer Cells ◽  
Human Breast ◽  
Kinetics Of ◽  
Mcf 7

The kinetics of photosensitizer 2-devinyl-2-(1-methoxylethyl) chlorinf(CPD4) uptake in MCF-7 human breast cancer cells is described by a diffusion kinetics model and experimentally investigated using laser scanning confocal microscopy (LSCM). CPD4 permeated into MCF-7 cells with increasing incubation time, which was followed by its binding to cell organelles. Subcellular distribution study revealed that CPD4 was primarily localized on the mitochondria and membranes, supporting that the mode of transmembrane transport was diffusion. A kinetics model describing CPD4 passing through the plasma membrane of MCF-7 cells was proposed based on Fick's first law of diffusion. The kinetics of cellular uptake of CPD4 was studied by three-dimensional LSCM. By fitting the experimental data using the above model, important cellular uptake and distribution parameters were obtained, which are of clinical significance in photodynamic therapy.

scholarly journals Sphingosine Kinase Transmits Estrogen Signaling in Human Breast Cancer Cells

2003 ◽  
Vol 17 (10) ◽  
pp. 2002-2012 ◽  
Author(s):  
Olga A. Sukocheva ◽  
Lijun Wang ◽  
Nathaniel Albanese ◽  
Stuart M. Pitson ◽  
Mathew A. Vadas ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Cell Growth ◽  
Cancer Cells ◽  
Human Breast Cancer ◽  
Breast Cancer Cells ◽  
Sphingosine Kinase ◽  
Human Breast Cancer Cells ◽  
Human Breast ◽  
Mcf 7 ◽  
Cytoplasmic Signaling

Abstract Current understanding of cytoplasmic signaling pathways that mediate estrogen action in human breast cancer is incomplete. Here we report that treatment with 17β-estradiol (E2) activates a novel signaling pathway via activation of sphingosine kinase (SphK) in MCF-7 breast cancer cells. We found that E2 has dual actions to stimulate SphK activity, i.e. a rapid and transient activation mediated by putative membrane G protein-coupled estrogen receptors (ER) and a delayed but prolonged activation relying on the transcriptional activity of ER. The E2-induced SphK activity consequently activates downstream signal cascades including intracellular Ca2+ mobilization and Erk1/2 activation. Enforced expression of human SphK type 1 gene in MCF-7 cells resulted in increases in SphK activity and cell growth. Moreover, the E2-dependent mitogenesis were highly promoted by SphK overexpression as determined by colony growth in soft agar and solid focus formation. In contrast, expression of SphKG82D, a dominant-negative mutant SphK, profoundly inhibited the E2-mediated Ca2+ mobilization, Erk1/2 activity and neoplastic cell growth. Thus, our data suggest that SphK activation is an important cytoplasmic signaling to transduce estrogen-dependent mitogenic and carcinogenic action in human breast cancer cells.

Estrogen-inducible pS2 protein is not the key regulatory component in the proliferation of human breast cancer cells (MCF-7)

1993 ◽  
Vol 215 (3) ◽  
pp. 671-676 ◽  
Author(s):  
Noriyoshi KIDA ◽  
Tomoaki YOSHIMURA ◽  
Haruo TAKAHASHI ◽  
Seiji NAGAO ◽  
Yoshinori NOZAWA ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Cancer Cells ◽  
Human Breast Cancer ◽  
Breast Cancer Cells ◽  
Human Breast Cancer Cells ◽  
Human Breast ◽  
Mcf 7 ◽  
Ps2 Protein

Oxidative Stress in Caffeine Action on the Proliferation and Death of Human Breast Cancer Cells MCF-7 and MDA-MB-231

2020 ◽  
pp. 1-11
Author(s):  
Kaliana Larissa Machado ◽  
Poliana Camila Marinello ◽  
Thamara Nishida Xavier Silva ◽  
Cássio Fernando Nunes Silva ◽  
Rodrigo Cabral Luiz ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Oxidative Stress ◽  
Cancer Cells ◽  
Human Breast Cancer ◽  
Breast Cancer Cells ◽  
Human Breast Cancer Cells ◽  
Human Breast ◽  
Mcf 7
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