It is my pleasure to appear before you to discuss the research programs of the
National Institute of Mental Health (NIMH). My first year as Director of the NIMH
has reinforced my perception that this is a period of extraordinary scientific opportunity
for understanding the brain, its role in behavior, and what goes wrong in the brain to
produce mental illness. The knowledge we are gaining should improve our capacities
to treat and, eventually, prevent an array of mental disorders.
In this statement, I will comment briefly on the burden of mental disorders;
highlight key scientific accomplishments and opportunities; and describe several
administrative steps we are taking to speed our progress as efficiently as possible.
Schizophrenia, major depression and manic depressive illness, severe anxiety
disorders, obsessive compulsive disorder, anorexia nervosa, and other severe mental
illnesses affect some 5 million adults. Additional millions of Americans suffer other
disorders that occur across the lifespan, from childhood autism to dementias in the
aged. All told, mental disorders cost the United States more than $148 billion each
year. The U.S. experience is not atypical. A study sponsored by the World Bank and
World Health Organization recently forecast that by the year 2020, as we effectively
meet the challenge of infectious disease in developing countries, major depression
alone will rival chronic ischemic heart disease as the single leading cause of disability
worldwide (Table 1). The study makes it clear, moreover, that the courses of the top
five diseases from all causes are heavily influenced by human behavior. Given the immense public health burden of brain disease and its impact on our
Nation's productivity, I am encouraged that mental illness has emerged as a prominent
theme in our Nation's efforts to set health care priorities, as evident, for example, in the
debate concerning insurance parity. Americans are increasingly aware that serious
mental illness is not a moral failing or weakness, but a disorder of a specific organ, the
brain, just as coronary artery disease is a disorder of a specific organ, the heart. Mental
illnesses are brain disorders that will be understandable in terms of molecular and
cellular processes in the brain and the brain's interaction with the environment. With
this recognition, the stigma once associated with mental illness is fading.
Independent analyses show that research is an effective response to the
economic and social burden of mental illness and to the needs of patients and their
families. For example, a study published in the journal Science documents savings of
$145 billion to the U.S. economy since 1970 when the FDA approved lithium for
treating manic depressive illness. Clozapine maintenance treatment for schizophrenia,
approved by the FDA in 1990, yields annual savings of $1.4 billion for the estimated
60,000 patients receiving this medication. These treatments, and the resultant savings,
reflect a return on a sustained research investment.
Modern mental health research relies on many of the same methodologies and
technologies used in other areas of medicine, but applies them to an array of questions
that extend from the cell to society: from studies of the genetics of complex human
disorders, to molecular neurobiology, to brain circuits and behavior, to clinical trials of
new treatments, to sophisticated services research designs needed to understand the
effectiveness of treatments in complex, real-world settings.
The human brain is the most complex structure in our known universe. If we
are to understand the roots of mental illness, we must press on with fundamental
investigations of the brain. The truly novel and effective treatments of tomorrow will
be based on the investments in basic science that we make today. The dividends of our
investment are seen in recent NIMH-supported basic science advances:
- We have identified a molecule--a protein found on the surfaces of nerve cells--that early
in brain development appears to guide specific emerging cells to become part
of the brain's limbic system, which is involved in the control of emotion and
motivation. Any alterations in such guidance systems in the developing brain could
lead to a cascade of abnormal circuit formation and could be the cause of illnesses such
as schizophrenia or autism.
- Another accomplishment is the deciphering of a cellular mechanism that may be
responsible for pruning of excess cortical neurons that are purposely over-produced in
early phases of brain development. Here too, the discovery helps to flesh out a
suspected developmental cause of the brain defects in schizophrenia.
- In yet another discovery, scientists using advanced molecular techniques in the
mouse, coupled with basic behavioral science, have identified a gene that controls daily
biological rhythms. A behavioral test, which exploits the tendency of mice to be highly
active during the night and less active in daytime, enabled isolation of a mutation in a
gene named clock, which controls the duration of daily biological rhythms. This work,
and related research in the fruit fly, is clarifying a complex chain of events that regulate
our sleep/wake cycle, a cycle that is disrupted in mood disorders, and also is crucial to
understanding human problems ranging from sleep disorders to jet lag.
Such advances make it clear that innovative animal models and the molecular
biological approaches constitute an essential foundation of our "bottom up" efforts to
understand larger-scale brain systems, their role in behavior, and what it is that goes
awry in brain function that leads to mental disorder.
Human genetics is a vital component of our efforts. As molecular genetics
comes of age in medical science, we see that disorders such as schizophrenia and manic
depressive illness are complex disorders, much like diabetes and hypertension. We
know that certain genetic patterns, while not directly causing an illness, can lay a
foundation for increased vulnerability to illness. We know that individual vulnerability
to mental disorders and other complex traits is due to the interaction of multiple genes
rather than to a flaw, or mutation, in a single gene. Moreover, it appears that no single
genetic mutation is necessarily shared by all individuals with a given disorder--indeed,
there likely are multiple genetic pathways to vulnerability. Environmental factors may
then interact with the genetic vulnerability to lead to the onset of a specific illness.
Modern genetics also permits us to understand brain-behavior relationships in
animal models. Scientists now can manipulate the mouse genetic code by adding or
deleting single genes, and soon will be able to deactivate genes in specific brain
locations at a predetermined time in the animal's development. These same approaches
will help us understand human disease vulnerability genes whenever we find them.
Of course, what we glean from molecular genetics and other basic research will
be most relevant to clinical concerns only when we understand these processes against
a backdrop of social context, interpersonal interactions, individual psychology, and
neural circuits. Thus, each advance in understanding genetic mechanisms opens
opportunities for basic and clinical investigation. To ensure that we capitalize fully on
these opportunities, the NIMH attaches high priority to research that translates basic
findings into the realm of clinical investigation and application. NIMH-funded research on childhood and adolescent mental disorders illustrates
our commitment to clinical and treatment research. As many as 20 percent of young
Americans between the ages of 7 and 14--approximately 10 million children--suffer
from mental health problems severe enough to compromise their ability to function.
While any interruption to normal developmental processes is of concern to us,
we attach particularly high priority to research on autism, a severe disorder of
communication and behavior that affects more than 100,000 Americans. Family and
twin studies point to a genetic cause in autism, particularly when multiple cases occur
in a family. Among siblings of an autistic person, the prevalence rate for the disorder is
75 times higher than in the general population. The importance of finding the genes
responsible for autism lies in their value in diagnosis as well as in providing essential
information about the regulation of brain development. NIMH researchers at three
different locations now are studying families using a combination of strategies, and the
likelihood of identifying susceptibility genes in the next several years is high. As this
search progresses, neuroimaging studies are providing evidence of abnormalities in
several brain regions in persons with autism. Such findings strengthen hypotheses that
a genetically-triggered disturbance in brain development early in fetal life is responsible
for the devastation of autism. Our research complements an NIH-wide effort focused
on autism, with other concentrated activities in the neurology, child health, and
communicative disorders institutes.
For all childhood mental disorders, we must have a full range of interventions;
that is, treatments based on behavioral approaches such as psychotherapy as well as
medications. In one recent project, investigators developed a 16-week cognitive-behavioral
intervention specific to the needs of children with anxiety. Untreated,
childhood anxiety disorders tend to persist into adulthood and are associated with a
range of psychological and social impairments. The psychotherapeutic approach
reduced anxiety, and these benefits were maintained for more than three years.
Such advances do not permit us to rest on our laurels. Recognizing that
resources are limited, in my first year at NIMH, we have worked to identify and
prioritize research challenges. Let me report briefly on progress in three major areas to
strengthen our programs and make them even more cost-effective.
First, our Intramural Research Program Planning Committee, which was created
in response to congressional interest in the revitalization of intramural research across
the NIH campus, has completed its work, and I have begun to implement the nearly 80
recommendations it developed. These call for making many labs smaller; apportioning
funds in a way that will offer incentives for translational research; creating incentives
for excellence; and freeing up resources so we can recruit and support the most
outstanding young and mid-career investigators. A top quality intramural program can
create a superb complement to our extramural program by bringing together a critical
mass of both basic and clinical researchers and, by stability of funding combined with
rigorous review, permitting them to undertake long-term-, higher risk-, and
interdisciplinary projects.
Secondly, with extensive consultation from our extramural community, I have
undertaken a fundamental restructuring of our extramural research funding divisions.
The first impetus for this change is fundamentally scientific--that is, our divisional
structure, developed for a previous scientific era, today impedes our efforts to
encourage and make necessary scientific connections--for example, between basic and
clinical neuroscience. Changes we are making also will yield greater administrative
efficiency; a structure that more closely reflects the contemporary scientific process will
permit us to use our administrative funds in the most streamlined and effective manner.
A third area of change concerns the role of our National Advisory Mental
Health Council. The breadth of interests and expertise of our Council members is
impressive, as is the intensity of their commitment to mental health issues. I have been
immensely gratified by the enthusiastic and productive response of our Council
members to my invitation to take a more active working role in conducting in-depth,
hands-on reviews of the operations of various NIMH's programs: Our science
communications and prevention research portfolio are now being examined by Council
work groups and more will follow.
Let me conclude by returning to the most important aspect of our work, which is
the science. Our efforts in the coming year will be aimed at new initiatives in the
genetics of vulnerability to mental disorders, using the tools of molecular biology and
neurobiology together to understand the function of the normal brain and how things go
wrong with mental disorders, and development of programs to translate what we learn
from basic brain and behavioral research to clinical applications. In addition we will
begin reforming our approach to clinical trials and adapting what we learn to people in
the real world. An important task for the mental health services research community
will be to study the impact of managed care on the mentally ill, a particularly
vulnerable population.
For the scientific activities I have highlighted here and for related programs,
NIMH requests $629,739,000 for fiscal year 1998. Thank you Mr. Chairman. I will be
pleased to answer any questions.
Table 1 |
Worldwide Burden of Disease |
Estimate 1990 |
Projection 2020 |
Rank |
Cause |
% |
Rank |
Cause |
% total |
1 |
Lower respiratory infections |
8.2 |
1 |
Ischemic heart disease |
5.9 |
2 |
Diarrheal diseases |
7.2 |
2 |
Unipolar major depression |
5.7 |
3 |
Perinatal conditions |
6.7 |
3 |
Road traffic accidents |
5.1 |
4 |
Unipolar major depression |
3.7 |
4 |
Cerebrovascular disease |
4.4 |
5 |
Ischemic heart disease |
3.4 |
5 |
Chronicobs pulmonary disease |
4.2 |
|
|
|
|
|
|
Global Burden of Disease' 1996 - WHO, Harvard School of Public Health, World Bank |