Featured Research

from universities, journals, and other organizations

First Transformation Of Normal Human Cells Into Cancer Cells

Date:
July 30, 1999
Source:
Whitehead Institute For Biomedical Research
Summary:
Researchers led by Dr. Robert A. Weinberg of the Whitehead Institute for Biomedical Research have made the first genetically defined human cancer cells, according to a report published in the July 29 issue of Nature. This achievement brings scientists one step closer to understanding the complex process by which human cells become cancerous.

Researchers led by Dr. Robert A. Weinberg of the Whitehead Institute for Biomedical Research have made the first genetically defined human cancer cells, according to a report published in the July 29 issue of Nature. This achievement brings scientists one step closer to understanding the complex process by which human cells become cancerous.

The genetically defined tumor cells will give scientists an important new window on the biochemical and physiologic changes involved in the development of human cancer, Dr. Weinberg says. They promise to be particularly useful for exploring the later changes in tumor development including the genetic changes that lead to metastatic disease, a problem that has been difficult to study in the past.

The conversion of normal cells into tumor cells involves changes in the activity of a number of distinct different genes and proteins in a cell. Although scientists have been able to transform normal mouse cells into tumor-forming cells by introducing several cooperating oncogenes (cancer-causing genes) into these cells, human cells have been resistant to such transformation.

"We wondered what it was about the mouse cells that made them so easy to transform and hypothesized that it might have something to do with the presence of the enzyme telomerase," says Dr. William C. Hahn, a postdoctoral fellow in the Weinberg laboratory. Dr. Hahn and Dr. Christopher M. Counter, a former Whitehead postdoctoral fellow now at Duke University Medical Center, are the lead authors on the Nature paper.

Two years ago, Dr. WeinbergΥs group and others identified the gene that codes for the key component of human telomerase, an enzyme that prevents the natural shortening of chromosomes during cell division. When the telomerase gene is switched on, cells continue to grow and divide indefinitely. Such rampant, unchecked cell growth is characteristic of cancer, says Dr. Hahn, who is also an oncologist at the Dana-Farber Cancer Institute. Interestingly, in humans, the telomerase gene is turned off in most normal cells and is turned on in most cancer cells. But in mice, the telomerase gene is always on.

"The next question we asked ourselves was whether telomerase is on in cancer cells because the cells need the enzyme to grow or whether it just comes along for the ride," Dr. Hahn explains.

To answer this question, they generated cell lines that expressed two collaborating oncogenes, the large-T oncoprotein and the ras oncogene. Oncogenes are often mutant versions of normal genes (called proto-oncogenes) that participate in regulation of the cell cycle. When the genes are altered due to genetic or environmental factors, they encourage runaway cell proliferation.

In the laboratory, the Whitehead scientists found that cell lines genetically engineered to express the two oncogenes changed appearance, but did not transform into tumor cells. However, cell lines that expressed the telomerase gene in addition to the oncogenes developed into tumors.

"One important conclusion from this study is that there are not an infinite number of cellular changes separating cancer cells from normal cells, but that tumor development is a finite process," Dr. Hahn adds. The ability to transform cells experimentally will help scientists determine the finite number of molecular pathways that produce the abnormal traits characteristic of tumor cells.

Because the tumor cells generated in the Weinberg lab are not metastatic, they will actually be a useful baseline for studying the process of metastasis. Scientists can express a battery of individual genes in these baseline tumors and determine exactly which genes cause the tumors to invade neighboring tissues.

The Weinberg lab also is exploring the molecular mechanism that activates the telomerase gene in cancer cells, a subject of immense interest to cancer researchers.

This study was supported in part by Merck and Co., the U.S. National Cancer Institute of the National Institutes of Health, a Damon Runyon-Walter Winchell Cancer Research Foundation Postdoctoral Fellowship (Dr. Hahn), and a Human Frontiers Postdoctoral Fellowship (Dr. Roderick L. Beijersbergen).

The Whitehead Institute is a non-profit, independent basic research and teaching institution recognized worldwide for outstanding contributions to cancer and AIDS research, developmental biology, infectious disease, basic molecular and cell biology, and the new field of genomics. The Whitehead Institute is affiliated with the Massachusetts Institute of Technology in its teaching activities, but wholly responsible for its own research programs, governance, and finance.

###

The title of the paper is: "Creation of human tumour cells with defined genetic elements." The authors are:

William C. Hahn, Whitehead Institute for Biomedical Research and Dana-Farber Cancer Institute

Christopher M. Counter, Duke University Medical Center (formerly of the Whitehead Institute for Biomedical Research)

Ante S. Lundberg, Whitehead Institute for Biomedical Research, Dana-Farber Cancer Institute

Roderick L. Beijersbergen, Whitehead Institute for Biomedical Research

Mary W. Brooks, Whitehead Institute for Biomedical Research

Robert A. Weinberg, Whitehead Institute for Biomedical Research and Massachusetts Institute of Technology


Story Source:

The above story is based on materials provided by Whitehead Institute For Biomedical Research. Note: Materials may be edited for content and length.


Cite This Page:

Whitehead Institute For Biomedical Research. "First Transformation Of Normal Human Cells Into Cancer Cells." ScienceDaily. ScienceDaily, 30 July 1999. <www.sciencedaily.com/releases/1999/07/990730073753.htm>.
Whitehead Institute For Biomedical Research. (1999, July 30). First Transformation Of Normal Human Cells Into Cancer Cells. ScienceDaily. Retrieved September 2, 2014 from www.sciencedaily.com/releases/1999/07/990730073753.htm
Whitehead Institute For Biomedical Research. "First Transformation Of Normal Human Cells Into Cancer Cells." ScienceDaily. www.sciencedaily.com/releases/1999/07/990730073753.htm (accessed September 2, 2014).

Share This




More Health & Medicine News

Tuesday, September 2, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Get on Your Bike! London Cycling Popularity Soars Despite Danger

Get on Your Bike! London Cycling Popularity Soars Despite Danger

AFP (Sep. 1, 2014) — Wedged between buses, lorries and cars, cycling in London isn't for the faint hearted. Nevertheless the number of people choosing to bike in the British capital has doubled over the past 15 years. Duration: 02:27 Video provided by AFP
Powered by NewsLook.com
Can You Train Your Brain To Eat Healthy?

Can You Train Your Brain To Eat Healthy?

Newsy (Sep. 1, 2014) — New research says if you condition yourself to eat healthy foods, eventually you'll crave them instead of junk food. Video provided by Newsy
Powered by NewsLook.com
We've Got Mites Living In Our Faces And So Do You

We've Got Mites Living In Our Faces And So Do You

Newsy (Aug. 30, 2014) — A new study suggests 100 percent of adult humans (those over 18 years of age) have Demodex mites living in their faces. Video provided by Newsy
Powered by NewsLook.com
Liberia Continues Fight Against Ebola

Liberia Continues Fight Against Ebola

AFP (Aug. 30, 2014) — Authorities in Liberia try to stem the spread of the Ebola epidemic by raising awareness and setting up sanitation units for people to wash their hands. Duration: 00:41 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins