An impressive review in thus week's NATURE surveys the complexities of the causes and mechanisms of cellular senescence. Of particular interest is the increasing evidence for a critical role of senescent cells in the aging of tissues and organs. This can come about in many ways including loss of stem cell capabilities. However, one key aspect is the ability of senescent cells to produce inflammatory factors that then lead to tissue degeneration. The growing information on the link between cell senescence and aging opens the door to possible therapeutic approaches that might slow down the decline of functions with age.
http://www.nature.com/nature/journal/v509/n7501/full/nature13193.html
This blog will deal with the social, economic and public policy implications of contemporary science and technology with an emphasis on biomedical aspects.
Friday, May 23, 2014
Friday, May 16, 2014
NIH Bows to Political Correctness
The NIH has long sought to
ensure that the diagnostic and therapeutic research it supports will be of
value to both men and women. For that
reason it has emphasized steps such as full inclusion of females in clinical
trials. Now however, new policies are broadening that mandate to an
unreasonable degree. Not only will
scientists be asked to include females in clinical trials and in more basic
studies using animal models of disease, but they will also be asked to use cell
lines derived from both males and females (1).
(1) http://www.nature.com/news/policy-nih-to-balance-sex-in-cell-and-animal-studies-1.15195
Thursday, May 8, 2014
Young Blood for Ageing Organs
There has been a great deal
of interest in the idea of using stem cells to reverse age-associated declines in
organ function. However, recent studies have shown that ageing tissues often have
plenty of stem cells; nonetheless, the stem cells lose their ability to
differentiate and to repopulate tissues with healthy cells. Now, in recent
issues of SCIENCE (1) and NATURE
MEDICINE (2), several research reports have shown that factors in the blood
of young mice can reverse age-related declines in stem cell and tissue
function. Some of these studies used parabiosis, that is joining the
circulatory systems of old and young animals. Another study focused on GDF11, a
TGF-beta type growth factor whose expression declines in older animals. Injections
of this protein improved both muscle function and (in another report) growth of
brain blood vessels and olfactory neurons. Perhaps the most exciting study (2)
demonstrated that blood from young mice could reverse age-related declines in
hippocampal cells and associated cognitive impairments.
There has always been tremendous
interest in seeking means to slow the declines associated with ageing. However,
the work discussed here, as well as other recent studies, suggest that an
actual reversal (at least in part) of the ageing process may be possible. While
this is all still far away from use in humans, it offers a tantalizing prospect
that could have enormous implications both medically and in terms of impacts on
society.
(1)
(2)
http://www.nature.com/nm/journal/vaop/ncurrent/full/nm.3569.html
Friday, May 2, 2014
Finally, some sound thoughts about PhD training from the big shots!
PNAS recently published an
opinion article from four very prominent individuals about the current malaise
in biomedical research and training. The
authors were Bruce Alberts (former editor of SCIENCE), Marc Kirschner (a Dept
Chair at Harvard), Shirley Tilghman (former President of Princeton) and Harold
Varmus (nobelist, and Director of the National Cancer Institute). This is about
as high powered as you can get in science!
The article analyzed several
problematic aspects of the current biomedical research system but prominently
featured the depressing scenario regarding PhD training. Based on various
perverse incentives, both senior faculty and university administrators have
continued to expand the PhD trainee population during a period when employment
prospects for biomedical PhDs have drastically diminished. Academia is at
saturation, the pharmaceutical industry is eviscerating its research programs,
and the growth of smaller biotech companies is just not enough to provide
adequate jobs. In my experience more and more PhDs are going into jobs such as
clinical trials management, market research, and other administrative functions
for which intensive training in laboratory research is not essential. What a
waste!
The abovementioned gurus
make some valuable suggestions such as:
(1) Removing support for graduate stipends from research
grants and placing them in competitive training grants; this would give NIH
more direct control over trainee numbers.
(2) Placing renewed emphasis on Master’s degrees. In many
cases this would provide sufficient science training for some of the jobs
mentioned above, while consuming far less time for the trainee.
(3) Developing stable career paths for staff scientists (as
opposed to faculty/principle investigators) in universities and other research
institutions. There are lots of talented people who would like to do science but
do not want the pressure of constantly seeking grant funding. There should be
ways of supporting these individuals.
None of these ideas are new.
Many people, including me, have been advocating similar changes for years.
However, it is nice to see some very influential people espouse the same ideas.
Maybe something will get done about the problem. But don’t hold your breath!
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