Epithelial Cells

Publication Title: 
Experimental Cell Research

SV40 T-antigen-expressing human cells generally have an extension of lifespan until a period called "crisis" begins. On rare occasions a clone of cells emerges from the population in crisis and gives rise to an immortalized cell line. The present study compares the frequency of immortalization of cells from two different human lineages, lung fibroblasts and mammary epithelial cells.

Author(s): 
Shay, J. W.
Van Der Haegen, B. A.
Ying, Y.
Wright, W. E.
Publication Title: 
Oncogene

Normal human breast epithelial cells were transfected with expression vectors containing the p53 gene mutated at either codon 143, 175, 248 or 273, or by infection with a recombinant retroviral vector containing the p53 gene mutated at codons 143, 175, 248, or 273. The breast epithelial cells were monitored for extension of in vitro lifespan and immortalization. Expression of some, but not all, p53 mutants resulted in an extension of in vitro lifespan.

Author(s): 
Gollahon, L. S.
Shay, J. W.
Publication Title: 
Oncogene

This study addresses the question of whether loss of p16INK4 expression contributes to the immortalization of human cells. In vitro immortalization usually proceeds through two phases. In the first phase (lifespan extension), cells continue proliferating and their telomeres continue shortening beyond the point at which normal cells become senescent. In the second phase (immortalization), the cells activate a telomere maintenance mechanism and acquire an unlimited proliferative potential.

Author(s): 
Noble, J. R.
Rogan, E. M.
Neumann, A. A.
Maclean, K.
Bryan, T. M.
Reddel, R. R.
Publication Title: 
Cancer Research

Inactivation of p16INK4 tumor suppressor gene function is frequently observed in breast cancer. We examined p16INK4 expression in human mammary epithelial cell (HMEC) cultures established from four normal donors. Normal HMECs divide a limited number of times before proliferation ceases in a state referred to as selection (or M0). The cell subpopulation that emerges spontaneously from selection undergoes a further limited period of proliferation before senescence.

Author(s): 
Huschtscha, L. I.
Noble, J. R.
Neumann, A. A.
Moy, E. L.
Barry, P.
Melki, J. R.
Clark, S. J.
Reddel, R. R.
Publication Title: 
Cancer Research

The vast majority of breast cancers are carcinomas that arise from mammary epithelial cells (MECs). One of the key early events in tumorigenic transformation is the ability of cells to overcome replicative senescence. However, the precise genetic changes that are responsible for this event in MECs is largely unknown. Here, we report that Bmi-1, originally identified as a c-Myc cooperating oncoprotein, can bypass senescence, extend the replicative life span, and immortalize MECs. Furthermore, Bmi-1 was overexpressed in immortal MECs and several breast cancer cell lines.

Author(s): 
Dimri, Goberdhan P.
Martinez, Jose-Luis
Jacobs, Jacqueline J. L.
Keblusek, Petra
Itahana, Koji
Van Lohuizen, Maarten
Campisi, Judith
Wazer, David E.
Band, Vimla
Publication Title: 
Archivum Immunologiae Et Therapiae Experimentalis

Vasculature is essential for the sustained growth of solid tumors and metastases. Tumor cells surviving vascular-disruptive therapeutic intervention (especially those present at the tumor rim) can contribute to tumor regrowth. The aim was to strengthen, by carrier-mediated delivery of a chemotherapeutic, the curative effects of a bifunctional anti-vascular oligopeptide capable of inducing vascular shutdown and tumor shrinkage. For the in vitro experiments and animal therapy, ACDCRGDCFC-GG-(D)(KLAKLAK)(2) peptide (900 microM in D-PBSA, i.e.

Author(s): 
Sochanik, Aleksander
Mitrus, Iwona
Smolarczyk, Ryszard
Cicho?, Tomasz
Snietura, Miros?aw
Czaja, Maria
Szala, Stanis?aw
Publication Title: 
Fundamental & Clinical Pharmacology

Cataract formation represents a serious problem in the elderly and has a large impact on healthcare budget. Aging and cataract formation are relatively complex phenomena, both in vivo and in vitro. Telomeres are special structures at the end of chromosomes. They shorten during each round of replication, and this has been characterized as a mitotic counting mechanism.

Author(s): 
Babizhayev, Mark A.
Vishnyakova, Khava S.
Yegorov, Yegor E.
Publication Title: 
Nephrology, Dialysis, Transplantation: Official Publication of the European Dialysis and Transplant Association - European Renal Association

BACKGROUND: The bioartificial renal tubule device is a cell therapy system for renal failure. The major obstacle in the development of the bioartificial renal tubule device is the obtainment of a large number of viable renal tubule cells to seed on the inner surface of hollow fibers. Although our previous studies had used a transformed cell line, they may be dangerous for clinical uses. Therefore, different approaches to amplify renal proximal tubular epithelial cells (RPTEC) in culture without oncogenes, vectors and carcinogens have been required.

Author(s): 
Sanechika, Noriyuki
Sawada, Kaichiro
Usui, Yukio
Hanai, Kazuya
Kakuta, Takatoshi
Suzuki, Hajime
Kanai, Genta
Fujimura, Satoshi
Yokoyama, Tun Aung
Fukagawa, Masafumi
Terachi, Toshiro
Saito, Akira
Publication Title: 
Proceedings of the National Academy of Sciences of the United States of America

The canonical function of the human telomerase protein (hTERT) is to synthesize telomeric DNA, but it has other biological activities, including enhancing cell proliferation, decreasing apoptosis, regulating DNA damage responses, and increasing cellular proliferative lifespan. The mechanistic relationships among these activities are not understood. We previously demonstrated that ectopic hTERT expression in primary human mammary epithelial cells diminishes their requirement for exogenous mitogens, thus giving them a proliferative advantage in a mitogen-depleted environment.

Author(s): 
Mukherjee, Shibani
Firpo, Eduardo J.
Wang, Yang
Roberts, James M.
Publication Title: 
International Journal of Cancer. Journal International Du Cancer

Ovarian cancer ranks fifth in cancer fatalities among American women. Although curable at early stages with surgery, most women are diagnosed with symptoms of late-stage metastatic disease. Moreover, none of the current diagnostic techniques are clinically recommended for at-risk women as they preferentially target low-grade tumors (which do not affect longevity) and fail to capture early signatures of more lethal serous tumors which originate in the fimbrae region of the fallopian tubes. Hence, the early detection of ovarian cancer is challenging given the current strategy.

Author(s): 
Damania, Dhwanil
Roy, Hemant K.
Kunte, Dhananja
Hurteau, Jean A.
Subramanian, Hariharan
Cherkezyan, Lusik
Krosnjar, Nela
Shah, Maitri
Backman, Vadim

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