Researchers at Emory University School of Medicine and their colleagues have
discovered a genetic mechanism that controls cellular growth in the fruit
fly Drosophila melanogaster, and believe it likely that a similar system
may be at work in normal and cancerous human cells.
The findings appear in the November issue of the journal Developmental Cell.
Ken Moberg, PhD, assistant professor of cell biology at Emory University
School of Medicine, is the lead and corresponding author of the paper. Moberg
joined the Emory faculty in 2003, and most of the work described in the paper
was done in his Emory lab. The senior author is Iswar K. Hariharan, professor
of cell and developmental biology at the University of California, Berkeley.
The Emory and Berkeley researchers have uncovered important details about
how mutational inactivation of the Drosophila version of Tumor Susceptibility
Gene 101 (Tsg 101) causes cells to overgrow, leading to organ hypertrophy
and tumor-like growths. Scientists first identified the human Tsg101 gene
in the mid-1990s based on its ability to control the growth of cells in a
culture dish, but little has been learned since then about how it does this.
"The work that was done ten years ago strongly implicated Tsg101 as a growth
regulatory gene, but how it works has remained largely obscure," Dr. Moberg
says.
Cancer is a word that strikes fear in the heart of individuals and families.
When it strikes close to us we sit impotently by as we watch our loved one
suffer. The victim is usually offered surgery, radiotherapy and chemotherapy
and goes through a dreadful time of illness and suffering, not knowing whether
they are winning the battle. Cancers vary. Some are more aggressive than
others. Some have a reasonable chance of survival. Other cancers are outright
killers. A cancer death is always ugly, usually painful and often degrading.
We know that the rates of most cancers are rising, especially breast cancer
in women and prostate cancer in men. We know that the death rates in these
cancers have dropped but the suffering has not. We also know that a great
deal of research has been undertaken but most of the results we hear about
are concerned with treatment. Perhaps there is a new wonder drug on the market
or a new discovery about how to administer radiation. This research is of
course very helpful once we are ill but why isnt there more effort
put into prevention? Do we need to get ill in the first place?
There are several fairly obvious reasons why most money, effort and publicity
is put into cure rather than prevention. It is really very easy to understand
but this bias is hard to justify.
First, almost all of us live in a capitalist economy. Businesses have to
make money and so they need to sell products. Drug companies invest heavily
in each drug that they develop and many never reach the market so pharmaceutical
companies need to market their products very strongly in order to recoup
money for their shareholders.
Second, prevention doesnt sell newspapers and is hard to prove. The
absence of something is never as interesting or startling as drama. Prevention
doesnt captivate the audience in the same way as dramatic cures. Being
saved from a trauma is much more interesting than the absence of trauma in
the first place. Drama sells newspapers, books, radio, TV and films.
Third, there are vested interests in many of the products that are causing
cancer. In 1939 there was definite proof that tobacco smoking causes lung
cancer. Serious efforts to curtail smoking have only occurred in some countries
recently. In others, it hasnt started. We have a long way to go before
we restrict other cancer causing agents.
Fourth, politicians dont win votes on prevention. Prevention is slow.
The results are only seen over the long term. Politicians are generally
disinterested in things that cant be accomplished within their term
of office.
The good news is that a great deal is known about the cancer process and
the variety of things that can affect it. There are three major steps in
development. They often occur over long periods of time, even decades, but
can occur simultaneously in one part of the body. The steps are MUTATION,
CANCER PROMOTION and CANCER PROGRESSION.
The chances of any of these steps taking place in your body can be significantly
reduced by understanding and knowledge. Research has explained most of the
mechanisms that underlie cellular errors and the progression of changes from
a normal cell to a cancer cell. Intelligent people are capable of understanding
these processes even without a Science or Health background. Research has
also gone a long way to showing us how the three stages can be eliminated
or minimized. This is still work in progress but there is already a great
deal that you can do right NOW.
Dr Judy Ford is an internationally respected geneticist who has undertaken
considerable research into the
causes of cancer
, and the steps that can be undertaken to
prevent
cancer or greatly reduce personal risk. Dr Ford worked for 30 years in
Cancer Research, specializing in how genetic material can be damaged by some
chemicals and radiations. She also contributed a great deal to knowledge
about how cells misdivide. She now works as a Science Communicator, explaining
Science in lay terms and showing people how they can modify their lifestyles
to reduce their risks of cancer. She has recently written an E-Book:
Know
Your Enemy: Understand and Reduce Cancer Risk.
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